KR101389861B1 - Cooling apparatus and continuous casting apparatus for segment having the same - Google Patents

Abstract

The present invention relates to a cooling device and a segment for a continuous casting machine having the same, which comprises an upper frame and a lower frame which are vertically spaced apart from each other, a plurality of rollers provided in the upper frame and the lower frame, And a cooling device for spraying cooling water to the cast steel, wherein the cooling device comprises: a cooling water spraying part disposed on the left and right of the plurality of rollers for spraying cooling water to the cast steel; And a driving unit for moving the cooling water jetting unit. The driving unit is installed in an outer central region of the plurality of rollers, and can effectively cool the billet in response to a change in the width of the billet during continuous casting.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling apparatus and a continuous casting apparatus having the same,

The present invention relates to a cooling device and a segment for a continuous casting machine having the same, and more particularly, to a cooling device capable of effectively cooling a cast steel in response to a change in width of the casting during continuous casting and a continuous casting machine will be.

In a continuous casting process, molten steel is continuously injected into a mold having a predetermined shape, and the molten steel is continuously drawn into the lower side of the mold to form slabs, blooms, , Billet, and the like.

A schematic configuration of a general continuous casting machine (hereinafter, referred to as a 'continuous casting machine') in which the continuous casting process is performed and a segment provided in the continuous casting machine will be described with reference to FIG.

A typical casting machine includes a ladle 10 containing molten steel refined in a steelmaking process and a tundish 20 for receiving molten steel through an injection nozzle connected to the ladle 10 and temporarily storing the molten steel A mold 30 for receiving molten steel temporarily stored in the tundish 20 and initially solidifying the molten steel in a predetermined shape and a series of molding operations for cooling an unfused cast steel S provided at a lower portion of the mold 30 Includes a cooling line (40) in which a plurality of segments (50) are successively arranged to carry out. Here, the segment 50 includes a plurality of tie rods (not shown) for vertically connecting the upper frame 51 and the lower frame 53 vertically arranged so that the rollers 52 and 54 are opposed to each other, A plurality of hydraulic cylinders 55 and an upper frame 51 for applying a pressing force to the cast steel S by adjusting the distance between the upper frame 51 and the lower frame 53 by substituting the tie rods with pistons, And a cooling device (not shown) provided inside the frame 53 for cooling the cast steel 1.

The billet S having passed through the mold 30 is pressed down by a plurality of rollers 52 and 54 while being passed through the spacing space between the upper frame 51 and the lower frame 53 to be formed into a constant shape. At this time, in the cooling apparatus, cooling water is injected into the cast steel S passing between the upper frame 51 and the lower frame 53 to cool it. The cooling system must maintain the same cooling level from narrow to wide to correspond to the change in the slab width. 2, a plurality of nozzles 56a and 56b are arranged in the width direction of the bill S so that some of the nozzles, for example, the billet S, And the slab S was cooled while the nozzle 56b positioned at the edge was turned on / off. However, such a method has many limitations such as complication of piping and the like due to an increase in the number of nozzles, which makes maintenance difficult. Accordingly, a method of spraying cooling water while moving a nozzle having a wide spray angle according to a slab width has been proposed. In this method, there is a problem that the driving means for moving the nozzle is located near the cast steel, and deterioration and breakdown frequently occur due to the heat generated by the cast steel and the moisture caused by the cooling water.

A method of disposing the driving means outside the segment in order to suppress the damage caused by heat and moisture has also been proposed. However, in this method, there is a problem that the distance between the nozzle and the driving means is distant, it is difficult to finely control the movement of the nozzle, and the length of the nozzle is also long and the nozzle is shaken due to the cooling water pressure.

KR 1082231 B KR 0578481 B KR 2009-10999 A

The present invention provides a cooling device and a segment for a continuous casting machine having the cooling device that can easily adjust the injection area of the cooling water according to the width change of the cast steel.

The present invention provides a cooling device capable of precisely and stably controlling and a segment for a continuous casting machine having the same.

The present invention provides a cooling device capable of improving durability and a segment for a continuous casting machine having the same.

The present invention provides a cooling device capable of improving process efficiency and productivity and a segment for a continuous casting machine having the same.

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The segment for a continuous casting machine according to the embodiment of the present invention is provided on a girder plate for connecting an upper frame and a lower frame spaced horizontally from left and right sides of a plurality of rollers arranged in the width direction of the cast steel, Wherein the cooling device comprises: a support member provided on the girder plate; drive means provided on the support member and provided to each of the drive unit to provide a rotational force; And a moving means provided between both the driving means and the cooling water spraying portion to symmetrically diagonally move the cooling water spraying portion, wherein the cooling water spraying portion includes at least one nozzle for spraying the cooling water, The moving means is connected to the driving means, and at least a part of the outer circumferential surface is provided with a screw St. rotary shaft and; A first rod arranged in a direction orthogonal to the rotation axis and having a screw formed on both outer circumferential surfaces thereof; A shaft coupled to both outer circumferential surfaces of the first rod so as to be movable along the longitudinal direction of the first rod; A wheel provided between the rotary shaft and the first rod and meshed with the screw of the rotary shaft to convert the rotary shaft into a direction orthogonal to the rotary direction of the rotary shaft to rotate the first rod; A ball screw nut provided between the first rod and the shaft so as to be meshed with the screw of the first rod to convert the rotational motion of the first rod into a linear motion to reciprocate the shaft in the left and right directions; A second rod disposed below the first rod in a direction orthogonal to the first rod and connected to the support member so as to be movable in a vertical direction and having a screw formed on an outer circumferential surface thereof; A bevel gear provided on the first rod and the second rod, the teeth formed on the outer circumferential surface of the bevel gear meshing with each other to rotate in a direction perpendicular to the rotating direction of the first rod to rotate the second rod; And a ball screw nut provided to engage with the screw of the second rod to convert the rotational motion of the second rod into a linear motion to reciprocate the second rod in the vertical direction.
Wherein the cooling water jetting unit comprises: a head having a channel formed therein; And a plurality of nozzles provided to the head so as to be communicated with the flow path.

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The moving means moves vertically and horizontally through the rotation of the driving means to diagonally move the cooling water injection portion.
The rotating shaft and the wheel may form a worm gear.
The moving means may be housed in the housing and connected to the driving means and the cooling water spraying portion.

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The driving means may be a servo motor.

The cooling device according to the embodiment of the present invention and the segment for a continuous casting machine having the cooling device according to the embodiment of the present invention can easily control the injection area of the cooling water in accordance with the change in the width of the cast steel to be continuously cast. In addition, more precise control is possible by using a servomotor instead of a hydraulic device which has been used as a driving means for moving a nozzle for jetting cooling water. Since the driving means is provided in the segment to reduce the size of the equipment, the maintenance efficiency can be improved, and the process efficiency and productivity can be improved, and facility cost and maintenance cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a configuration and a segment of a general continuous casting machine; Fig.
Fig. 2 shows an example of the use of a cooling device provided in the segment shown in Fig. 1; Fig.
3 illustrates a structure of a segment for a continuous casting machine according to an embodiment of the present invention.
Fig. 4 is a perspective view of the cooling device shown in Fig. 3; Fig.
Fig. 5 is a front view of the cooling device shown in Fig. 4; Fig.
6 and 7 are views showing a use state of a cooling apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know.

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

FIG. 3 is a view showing a structure of a segment for a continuous casting machine according to an embodiment of the present invention, and FIGS. 4 and 5 are a perspective view and a front view of the cooling device shown in FIG.

3, the segments include an upper roller assembly and a lower roller assembly spaced apart from each other in the vertical direction, and cooling (cooling means) for spraying cooling water (water and air) onto the cast steel S moving between the upper roller assembly and the lower roller assembly. Device 200 as shown in FIG. More specifically, the segments include an upper frame 100 and a lower frame 102, which are vertically spaced apart, and upper and lower frames 100 and 102 arranged in the width direction of the slab S, And a cooling device 200 for spraying cooling water onto the cast steel S, as shown in FIG. At this time, the upper frame 100 is spaced apart from the right and left sides of the rollers 120 and is connected by the girder plate 110, and the lower frame 102 is divided into left and right sides of the rollers 120 And is connected by a girder plate 110. [ The girder plates 110 are provided in the same number as the rollers 120 and support the rollers 120 while preventing the rollers 120 from being separated. The segment includes a tie rod 140 for vertically connecting the upper frame 100 and the lower frame 102 in a state of being spaced apart from each other and an upper frame 100 and a lower frame 100 for applying a downward force to the cast S, And a hydraulic cylinder 130 that adjusts the separation distance between the frames 102.

The cooling device 200 includes cooling water spraying parts 220 and 220 'for spraying cooling water to the slab S and driving parts 210 and 230 for moving the cooling water spraying parts 220 and 220' 210, and 230 may be formed in the outer central region of the plurality of rollers 120. That is, the cooling device 200 is installed between the upper frame 100 and the lower frame 102 spaced apart from each other. More specifically, the cooling device 200 is installed between the upper frame 100 and the upper frame 100, And may be installed in the lower central region of the girder plate 110 connecting the central region and the lower frame 102, respectively.

4 and 5, a cooling device is installed on a girder plate 110 provided on the outside of a plurality of rollers 120, and is provided with a slip S (hereinafter, referred to as "S") passing between an upper frame 100 and a lower frame 102 ). The cooling device 200 is provided to be symmetrical with respect to the upper roller combination and the lower roller combination, and the operation principle thereof is the same. Accordingly, the cooling device 200 provided in the upper roller assembly will be mainly described, and the cooling device provided in the lower roller assembly will be described as necessary.

The cooling apparatus 200 is installed in the upper central region of the girder plate 110 which is connected to the upper frame 100 and supports the rollers 120,

The cooling device 200 includes first and second cooling water spraying parts 220 and 220 'disposed on the left and right sides of the roller 120 to spray cooling water, first and second cooling water spraying parts 220 and 220' And a control unit (not shown) for controlling operations of the driving units 210 and 230 and the driving units 210 and 230, respectively. The driving units 210 and 230 include driving means 210 for providing a rotational force and moving means for diagonally moving the first and second cooling water spraying units 220 and 220 ' 230).

Each of the first and second cooling water spraying parts 220 and 220 'includes a head 222 and 222', in which a cooling water inlet for supplying cooling water (water and air) is formed and a flow passage (not shown) And a plurality of nozzles 224 and 224 'communicated with the flow path and spaced along the longitudinal direction of the slab S on the heads 222 and 222'. The first cooling water spraying part 200 and the second cooling water spraying part 200 'are disposed so as to face each other on the left and right sides of the roller 120. The plurality of nozzles 224 and 224' Is connected to the head 222, 222 'to inject cooling water. The plurality of nozzles 224 and 224 'are formed to extend in the downward direction in the upper roller assembly so as to inject cooling water into the slab S passing between the upper frame 100 and the lower frame 102, And is formed so as to extend upward in the lower roller assembly so as to inject the cooling water upward. The nozzles 224 and 224 'may be provided between the rollers 120, or between the rollers 120, and the arrangement thereof may be variously changed. At this time, the nozzles 224 and 224 'may be formed in a slit shape such that the injection area of the cooling water is formed to be long in the width direction of the bill S. By forming the plurality of nozzles 224 and 224 'so as to communicate with the flow paths formed in the heads 222 and 222', it is possible to cool the nozzles 224 and 224 ' It is possible to simplify the facilities such as piping and the like, and thus the maintenance property can be improved.

Various types of motors such as a DC motor, a stepping motor, and an AC servo motor may be used as the driving means 210 to provide rotational force. Particularly, when the AC servomotor is used as the driving means 210, a constant torque can be provided and the rotational speed can be finely adjusted. Thus, the movement of the moving means 230 can be controlled more precisely, The distance between the yarns 220 and 220 'and the cast steel S can be precisely controlled. In the present invention, the movement of the moving means 230 can be more precisely controlled by using the servo motor as the driving means 210. [ Also, the decelerator 212 is connected to the driving means 210 so that the rotational force output from the driving means 210 can be finely controlled. In addition, since the driving means 210 is installed directly on the girder plate 110, not the space provided separately for installing the driving means 210, space efficiency can be improved.

The moving means 230 includes a rotating shaft 231 connected to the driving means 210, a first rod 233 arranged at a lower portion of the rotating shaft 231 so as to be perpendicular to the rotating shaft 231, A second rod 238 disposed at a lower portion of the first rod 233 in a direction perpendicular to the first rod 233 and a second rod 238 disposed at a lower portion of the first rod 233 in a direction perpendicular to the first rod 233, 231 and the first rod 233 and between the first rod 233 and the second rod 238 and between the first rod 233 and the second rod 238 And a motion converting means. The first rod 233, the shaft 235 and the second rod 238 are housed in the housing 240 in which a space is formed, (Not shown). A support member 260 is provided at a central region of the upper portion of the girder plate, and a second rod 238 is connected to the support member 260 so as to be movable up and down. The support member 260 may be formed in a plate shape, or may be formed in a hollow shape having a space therein.

The housing 240 and the support member 260 suppress the deterioration and damage of the moving means 230 due to the influence of moisture, dust, and heat in the field where the cast steel is produced. A bar-shaped first guide member 252 may be provided on at least one side of the second rod 238 and an upper end connected to the housing 240 and a lower end disposed in the support member 260. have. The first guide member 252 serves to stably support the movement of the second rod 238 from at least one side of the second rod 238 while the second rod 238 moves in the vertical direction.

Each component of the moving means 230 will be described in more detail as follows. However, the constituent elements of the moving means 230 are not limited thereto and can be variously changed.

The rotary shaft 231 is arranged in a horizontal direction, and a screw 232a is formed in a part of the outer peripheral surface.

An annular wheel 232b having teeth at its outer circumferential surface is coupled to the center of the first rod 233 arranged in a vertical direction at a lower portion of the rotary shaft 231. A screw 232a formed on the outer circumferential surface of the rotary shaft 231, (232b) to form a first rotational direction converting means (232). The first rotation direction conversion means 232 transmits the rotational motion of the rotation shaft 231 rotating in the left and right direction to the first rod 233 so as to rotate the first rod 233 in the forward and backward directions, The first rotation direction changing means 232 may be a worm gear.

On both outer surfaces of the first rod 233, a screw 233a is formed, and a first motion converting means 234 is provided which reciprocates horizontally along the screw 233a. At this time, the screws 233a formed on the outer circumferential surfaces of both sides of the first rod 233 are formed in opposite directions so that the first and second cooling water spraying parts 220 and 220 'can move symmetrically with each other. That is, since the cooling water injection area must be controlled according to the width of the produced slab S, the first and second cooling water spray portions 220 and 220 'have widths of the slab S corresponding to the width of the slab S, Direction and the up-and-down direction, that is, to be inclined, the cooling water injection area can be controlled. A shaft 235 is connected to the first motion converting means 232 and the shaft 235 moves in the longitudinal direction of the first rod 233 along the moving direction of the first motion converting means 232. At this time, the first rod 233 may be used as a ball screw, and the first motion converting means 234 may be a ball screw nut.

The second guide member 250 may be provided on the outer circumferential surface of the first rod 233. The second guide member 250 is in the shape of a pipe having a flange formed on one side thereof, and the flange is fixed to the housing 240 and disposed in the horizontal direction. The first motion converting means 232 and the shaft 235 move linearly in the horizontal direction within the second guide member 250 as the first rod 233 rotates. A bearing 236 may be provided on the outer circumferential surface of the first rod 233. The bearing 236 is provided at a connection portion between the first rod 233 and the second guide member 250 so that the first rod 233 can freely rotate without being disturbed by the second guide member 250.

A second rod 238 is provided at a lower portion of the first rod 233 so as to be perpendicular to the first rod 233. The first rod 233 is connected to one side of the wheel 232b and the second rod 238 Conical gears 237a and 237b each having teeth on its outer circumferential surface are provided at the upper end, and the respective conical gears 237a and 237b are engaged with each other to form a second rotation direction conversion means 237. [ Here, the second rotation direction converting means 237 receives the rotational motion of the first rod 233 rotating in the forward and backward directions and rotates the second rod 238 in the left and right direction, and a bevel gear can be used.

A screw is formed on the outer circumferential surface of the second rod 238 and a second motion converting means 239 is provided. The second motion converting means 239 is fixed to the support member 260 and converts the rotational motion of the second rod 238 into linear motion. The second rod 238 moves in the vertical direction at the same time as the rotation, and the housing 240 supported by the second rod 238 can be moved up and down. The moving means 230 housed in the housing 240 and the driving means 210 and the first and second cooling water spraying portions 220 and 220 'connected to the housing 240 also move up and down.

Here, it is explained that the moving means 300 is formed of a rotating direction changing means such as a worm gear, a bevel gear, and a motion converting means such as a ball screw nut. However, the moving means 300 may be formed using various types of gears to be.

When the rotation shaft 231 rotates through the above-described structure, the first rod 233 rotates by the first rotation direction conversion means 232, and as the first rod 233 rotates, The first and second cooling water jetting parts 220 and 220 'move in the horizontal direction by moving along the first rod 233 in the longitudinal direction. At the same time, the first rod 233 is rotated by the second rotation direction conversion means 237, and the second rod 238 is rotated by the second motion conversion means 239 in the vertical direction, The driving means 210 and the first and second cooling water spraying portions 220 and 220 'supported by the rod 238 move in the vertical direction.

As a result, the first and second cooling water spraying parts 220 and 220 'installed on both sides of the shaft 235 can be symmetrically moved diagonally using one driving unit 210.

FIG. 6 and FIG. 7 are views showing the use state of the cooling apparatus according to the embodiment of the present invention. The cooling device is provided so as to be symmetrical to the upper and lower portions of the segment, but the cooling device provided on the upper portion of the segment, that is, on the girder frame 110 of the upper roller assembly will be described. The cooling device provided at the lower part of the segment is opposite to the cooling device provided at the upper part of the segment, but the driving principle thereof is the same.

First, a description will be given of a case where a cast steel S having a narrow width S, for example, a cast steel S having a width of 200 mm is produced by a continuous casting process.

Referring to FIG. 6, when the driving means 210 is operated through the control of the control unit, the rotating shaft 231 connected to the driving means 210 rotates in one direction. The first rod 233 rotates in a direction perpendicular to the rotation direction of the rotation shaft 231 by the first rotation direction conversion means 232 provided between the rotation shaft 231 and the first rod 233, The first motion direction changing means 234 coupled to the outer circumferential surface of the first rod 233 linearly moves toward the driving means 210 as the first rod 233 rotates. The shaft 235 connected to the first moving direction changing means 234 is moved in the same direction as the first moving direction changing means 234 so that the first and second cooling water jetting portions 220 and 220 ') Moves to the inside of the segment. The second rod 238 rotates in a direction perpendicular to the rotation direction of the first rod 233 and the second rod 238 rotates in the direction of rotation of the support member 260 And is lowered while being rotated by the fixed second motion converting means 239. The housing 240 connected to the second rod 238 is also lowered so that the driving means 210 connected to the housing 240 and the first and second cooling water spraying portions 220 and 220 ' . The distance between the nozzles 224 and 224 'of the first and second cooling water spray portions 220 and 220' and the surface of the slab S becomes close to each other and the cooling water sprayed through the nozzles 224 and 224 ' The spraying area of the spraying nozzle is reduced.

On the other hand, in the case of producing the cast steel S having a wide width, for example, 700 mm, in the continuous casting process, the cast steel S is produced in a process opposite to the case of producing the cast steel S having a relatively narrow width Can be cooled.

Referring to FIG. 7, the driving unit 210 is operated through the control of the control unit to rotate the rotating shaft 231 connected to the driving unit 210 in a direction opposite to that when producing the narrow cast steel S. The first rod 233 rotates in a direction perpendicular to the rotation direction of the rotation shaft 231 by the first rotation direction conversion means 232 provided between the rotation shaft 231 and the first rod 233, The first motion direction changing means 234 coupled to the outer circumferential surface of the first rod 233 linearly moves to the outside of the driving means 210 as the first rod 233 rotates. The shaft 235 connected to the first moving direction changing means 234 is moved in the same direction as the first moving direction changing means 234 so that the first and second cooling water jetting portions 220 and 220 ') Moves to the outside of the segment. The second rod 238 rotates in a direction perpendicular to the rotation direction of the first rod 233 and the second rod 238 rotates in the direction of rotation of the support member 260 And is rotated and raised by the fixed second motion converting means 239. The housing 240 connected to the second rod 238 is also raised so that the driving means 210 connected to the housing 240 and the first and second cooling water spraying portions 220 and 220 ' . Accordingly, the distance between the nozzles 224 and 224 'of the first and second cooling water spraying parts 220 and 220' and the surface of the slab S is increased, and the spray area of the cooling water sprayed through the nozzles 224 and 224 ' .

The cooling device according to the embodiment of the present invention will be described with respect to the cooling device provided in the segment constituting the continuous casting machine as described above, but the technical idea thereof is not limited thereto.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

100: upper frame 102: lower frame
110: girder plate 120, 122: roller
130: Hydraulic cylinder 140: Tie rod
200: cooling device 210: driving means
220, 220 ': Cooling water spraying part 230: Moving means
231: rotation axis 232: first rotation direction conversion means
233: first rod 234: first motion converting means
235: shaft 236: bearing
237: second rotation direction converting means 238: second load
239: second motion converting means 240: housing
250: second guide member 252: first guide member
260: Support member

Claims (15)

And a cooling device installed on a girder plate which connects the upper frame and the lower frame to each other and horizontally spaced apart from the right and left sides of a plurality of rollers arranged in the width direction of the cast steel to inject cooling water into the cast steel ,
The cooling device includes:
A support member provided on the girder plate,
Driving means provided on the supporting member to provide a rotational force,
A cooling water spraying portion provided on both sides of the driving means and having at least one nozzle through which cooling water is sprayed,
And a moving means provided between the driving means and the cooling water spraying portion for symmetrically diagonally moving the cooling water spraying portion,
Wherein,
A rotating shaft connected to the driving unit and having a screw formed on at least a part of an outer circumferential surface thereof;
A first rod arranged in a direction orthogonal to the rotation axis and having a screw formed on both outer circumferential surfaces thereof;
A shaft coupled to both outer circumferential surfaces of the first rod so as to be movable along the longitudinal direction of the first rod;
A wheel provided between the rotary shaft and the first rod and meshed with the screw of the rotary shaft to convert the rotary shaft into a direction orthogonal to the rotary direction of the rotary shaft to rotate the first rod;
A ball screw nut provided between the first rod and the shaft so as to be meshed with the screw of the first rod to convert the rotational motion of the first rod into a linear motion to reciprocate the shaft in the left and right directions;
A second rod disposed below the first rod in a direction orthogonal to the first rod and connected to the support member so as to be movable in a vertical direction and having a screw formed on an outer circumferential surface thereof;
A bevel gear provided on the first rod and the second rod, the teeth formed on the outer circumferential surface of the bevel gear meshing with each other to rotate in a direction perpendicular to the rotating direction of the first rod to rotate the second rod; And
A ball screw nut provided to engage with the screw of the second rod to convert the rotational motion of the second rod into a linear motion to reciprocate the second rod in the vertical direction;
≪ / RTI > The method according to claim 1,
Wherein the cooling water jetting unit comprises: a head having a channel formed therein;
And a plurality of nozzles spaced apart from each other in communication with the flow path in the head. The method according to claim 1,
Wherein the moving means moves vertically and horizontally through rotation of the driving means to diagonally move the cooling water jetting portion. The method according to claim 1,
Wherein the rotating shaft and the wheel form a worm gear. The method according to claim 1,
Wherein the moving means is housed in the housing and connected to the driving means and the cooling water jetting portion. The method according to claim 1,
Wherein the drive means is a servo motor. delete delete delete delete delete delete delete delete delete

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