KR100616406B1 - Hot pressing roll - Google Patents

Abstract

The present invention relates to a hot press roll, and in particular, on the outer circumferential surface of the roll tire coupled to the center roll or the outer circumferential surface thereof, protruding in the circumferential direction perpendicular to the direction of the rotation axis of the roll, and provided with circumferential grooves on both sides. A central support ring and a circular arc shape that surrounds the entire upper portion, the side, or all of the side surface of the center roll or the roll tire, and the entire center support ring, and are coupled to the groove on the inner side in a symmetrical direction with respect to the center support ring. And having a protrusion, wherein the outer circumferential surface has an arc shape, each of which is divided at a predetermined angle to form an outermost cylindrical outer circumferential surface of the roll with a plurality of segments which are bolted to the side of the center roll or roll tire. It relates to a hot press roll characterized in that it can produce a wide product by expanding the width of the hot press roll, Even if a crack occurs in the roll, repair and replacement by segment can be performed, thereby increasing production efficiency and reducing production costs.

Hot press roll, segment, groove

Description

Hot Press Roll {HOT PRESSING ROLL}

1 is a system schematic diagram schematically showing the configuration of one embodiment of a hot press roll of the present invention.

FIG. 2 is a diagram schematically illustrating a case where a segment used in an embodiment of the hot press roll of the present invention is separately separated.

3 is a cross-sectional view taken along line A-A of FIG. 1 as a coolant flow channel used in an embodiment of the present invention.

4 is a system schematic diagram schematically showing a side view of the configuration of one embodiment of the hot press roll of the present invention.

Explanation of symbols on the main parts of the drawings

10: center roll 20: roll tire

30: center support ring 32: groove

34: second groove 40: segment

42: stone tongue 44: second stone tongue

47: plate spring 49: bolt

52: coolant furnace 54: segment coolant furnace

The present invention relates to a hot press roll applied to a hot press roll applied to a reduced iron production facility in a steel mill, and a hot press roll that is a reduced iron production facility in a steel mill is reduced in a reactor. The products produced by the molded reduced iron production facility, which are compressed through high-temperature conditions between two rolls facing the milled iron ore, are classified into hot briquetting irons and hot compacting irons. The present invention is applicable to a variety of hot press rolls including a hot briquetting roll machine (HBI briquetting roll machine) and a hot compacting roll machine (Hot Compacting Roll Machine) which is an HCI production facility. That is, the present invention relates to such a hot press roll, and more specifically, to expand the width of the hot press roll to produce a wide product, and even if a crack or the like occurs in the roll, repair and replacement for each segment can be performed to improve production efficiency. The present invention relates to a hot press roll that can increase and reduce production costs.

In general, hot pressing rolls are high-temperature spectroscopy reduced by emulsifying iron ore charged in a reactor during the production of reduced iron with LNG or corex gas as reducing gas. Is a facility that produces molded reduced iron, which is compressed to high temperature by passing between two rolls facing each other through a hot pressing roll machine. Segments were attached to the upper surface of the center roll, or roll tires were applied to the equipment by inserting the roll tires into the center roll, so that the roll width could be produced only up to 300 mm wide.

However, since the narrow equipment has a limited production capacity, it is urgently required to develop a roll having a capacity of 600 mm according to the demand for increased production. In addition, the existing segment has a coolant flow path formed in the segment itself, so that a minute crack occurs in the segment. Even there is a problem that must stop the operation of the facility due to failure of the coolant leak.

In particular, in the Hot Compacting Roll Machine, a 600 mm wide segment cannot be applied to a segment. In this state, after processing a pocket on the surface of a cylindrical roll tire, the surface is heat-treated to produce reduced iron. However, during the operation, crack failure occurs due to the frequent expansion and contraction of roll tires due to temperature changes, and the breakage of cooling water frequently occurs due to the assembly gap between roll tires and shafts. In addition, the situation is causing a large economic loss due to the operation failure to stop production, and to replace the entire expensive roll tire (Roll Tire) in the case of cracks or leaks.

In order to solve the problems of the prior art as described above, the present invention can be applied to both HBI and HCI production equipment, to expand the width of the hot press roll to produce a wide product, even in the case of cracks in the roll, etc. The purpose of this invention is to provide a hot press roll that can be repaired and exchanged separately to increase the production efficiency, and the leakage of cooling water does not occur even when the segment is cracked, thereby increasing the production efficiency and reducing the production cost.

In order to achieve the above object, the present invention

A central support ring protruding in a circumferential direction on a central portion perpendicular to the rotational axis direction of the roll on the outer circumferential surface of the roll tire coupled to the center roll or its outer circumferential surface and having grooves in the circumferential direction on both sides thereof; And,

It is provided with an arcuate protrusion that surrounds the entire front portion, a part or all of the side surface of the center roll or the roll tire, and the whole of the center support ring, and is coupled to the groove on the inner side in a symmetrical manner based on the center support ring. The outer circumferential surface forms an arc shape, each of which is divided into a predetermined angle, the hot press comprising a plurality of segments that are bolted to the side of the center roll or roll tire to form the outermost cylindrical outer circumferential surface of the roll Provide a roll.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and specific examples.

The present invention relates to a hot press roll, and on the outer circumferential surface of the roll tire (20) coupled to the center roll (10) or its outer circumferential surface, is projected in the circumferential direction perpendicular to the direction of the rotation axis of the roll, the circumferential direction on both sides A central support ring 30 having a groove 32 and an entire upper surface of the center roll 10 or the roll tire 20, part or all of the side surface, and symmetrically with respect to the center support ring 30; , And wraps all of the central support ring 30, and has an arcuate protrusion portion 42 coupled to the groove 32 on an inner side thereof, and an outer circumferential surface thereof forms an arc shape, each of which is divided at a predetermined angle to form the center. It is configured to include forming the outermost cylindrical outer circumferential surface of the roll with a plurality of segments 40 coupled with bolts 49 to the side of the roll 10 or roll tire 20.

Through this, the 300 mm roll tire segment, which has been used only for small-scale small-capacity production equipment, has been extended to the large-capacity 600 mm wide-capacity equipment to make it possible to improve the structure. will be.

In other words, it is difficult to increase the width more than 300 mm due to the structural characteristics of the segment, so it is required to enlarge the width of the roll while maintaining the length of one segment as 300 mm. Similarly, the two segments are symmetrically combined so that the width of the entire roll is expanded to 600 mm.

In order to ensure that the symmetrical structure is firmly fixed, as shown in FIG. 1, the tip of the segment is located at the center of the center roll when the center of the roll tire is combined with the outer circumferential surface of the center roll or only the center roll without the roll tire. The central support ring 30 having the groove 32 in the circumferential direction of both sides is separately installed to fix the portion to fix the segment ends on the left and right sides.

That is, as shown in FIG. 1, the protrusion 42 of the segment is inserted into and fixed to the recess of the central support ring 30. The segment 40 is the recess 32 of the central support ring 30. The protrusion 42 has a circular arc configuration, as shown in FIG. The grooves and protrusions may be configured with one groove and protrusion as shown, or may be configured with multiple grooves and protrusions, and may be bound through various well-known concave-convex structures.

In addition, since the segment 40 having such a configuration constitutes the outermost circumferential surface of the roll as shown in FIGS. 1, 2 and 4, the center roll 10 or the roll tire is symmetrically regardless of its shape. It has a shape to surround the entire upper surface of the portion 20, a part or all of the side, and the whole of the central support ring (30). This makes the segment part form the outermost circumferential surface of the roll. In addition, the part covering the side is required to be fastened to the bolt 49 to be coupled between the segment 40 and the center roll 10 / roll tire 20, so that both ends of the segment join the protrusion to the groove. In this structure, the segments are firmly fixed by fastening the bolts 49 in close contact with the roll tires or the center rolls. The bolt is coupled to the side of the center roll when the bolt is coupled to the center roll, and when the roll tire is coupled to the center roll has a structure that is bolted to the side of the center roll or roll tire. The bolt may be applied to a variety of fastening bolts known thereto. Preferably, the fastening bolt is assembled with a disc spring 47 or a cone disc spring to absorb thermal expansion due to heating of the roll tire or the center roll. In addition to the dish spring, various spring washers or Belleville springs having a structure for absorbing thermal expansion may be included.

In addition, the segment is divided into a predetermined angle as shown in Figs. In this case, only the corresponding segment 40 can be replaced and work can be continued immediately. As described above, the outer circumferential surface forms an arc shape as described above. As shown in Figure 2 may be formed as a clean circumferential surface, various shapes such as various pockets, grooves, concave-convex structure on the circumferential surface can be formed on the surface as necessary in the process.

The number of segments to be divided may be configured in various numbers according to the size of the roll or the characteristics of the process, and the angle of each segment may vary according to the selection of the number.

Also preferably, the segment 40 is coupled to the center roll 10 or the roll tire 20 as shown in FIG. 1 so that the segments can be more firmly coupled to the center roll or the roll tire. A second groove 34 in the circumferential direction is further included on the side surface, and the segment 40 may have a configuration further including an arc-shaped second protrusion 44 corresponding to the second groove 34. have. In addition to this, more grooves and protrusions can be added. Through such a plurality of grooves and protrusions, a more firm coupling can be obtained in the press process performed under high load conditions.

In addition, since the roll is heated during the hot press process, the heating of such a roll causes a difference in thermal expansion between the joining sites, and cracks may occur accordingly, so in order to reduce this, it is preferable to prevent the temperature rise of the entire roll. . To this end, the center roll 10 and the segment 40 may be provided with a cooling water line, thereby allowing the cooling water to flow. That is, the center roll 10 further includes a cooling water passage 52 for supplying and recovering the cooling water from the center portion to the segment, and the segment 40 is connected to the cooling water passage 52 and is the outermost surface of the segment. It can be configured to further include a segment cooling water passage 54 for flowing the cooling water around. A specific example thereof is as shown in FIG. 1, through which cooling water is supplied from the central axis of the central roll and recovered. For this configuration, the inside of the center roll may have an internal cooling water line structure as shown in FIGS. 1 and 3 (four closed curve sectors correspond to drainage lines and the remaining parts correspond to water supply lines). Can be. In addition, since the upper surface of the segment is the hottest portion of the segment, the cooling water supplied from the center roll as shown in FIGS. 2 and 4 rises to the segment surface area and flows zigzag near the surface and then drains again. Has

In addition, in order not to weaken the structure of the center roll, it is preferable that it is not formed on one surface of the water supply and drainage line and is opened at a constant angle as shown in FIG. 4.

More preferably, the cooling water passage of the segment may further include a cooling tube installed therein and in contact with an inner surface thereof. Through this, when the cooling water passage is formed in the segment as it is, it is possible to prevent the leakage of water immediately during the cracking of the segment. In other words, the cooling of the segment is removed from the existing water jacket type, and the cooling tube such as copper tube having good thermal conductivity is accommodated and mounted on the inner surface of the segment to increase the cooling efficiency and to leak water even when a segment crack occurs. It has a structural feature to prevent malfunctions.

In order to charge the cooling tube, various known methods may be applied. Preferably, the cooling tube may have a structure in which the segment is divided based on a cooling water passage into which the cooling tube is charged. Through this, the segment is divided into an upper plate and a lower plate, and grooves corresponding to half of the cooling water path are formed on the upper and lower surfaces of the lower plate, respectively. Therefore, the cooling tube may be inserted into the recess and the upper and lower plates may be combined to form a segment.

Preferably, the lower plate is composed of various known heat transfer materials.

According to the hot press roll of the present invention as described above, it is possible to apply the hot press roll, which has been possible only the press roll of 300 mm or less, to 600 mm of wide width as a large-capacity production facility, thereby improving production efficiency and segment In the event of breakage or cracking, repair is possible only by replacing the relevant local segment, which can reduce the repair cost and increase the equipment operation efficiency, and contribute to the cost reduction compared to the previous improvement.

In addition, by adopting a cooling method in which a cooling tube such as a separate copper tube is separately separated, a breakdown of the coolant is prevented even if a segment is cracked, thereby greatly improving productivity.

The present invention described above is not limited to the detailed description, examples, and drawings of the above-described invention, and various one of ordinary skill in the art without departing from the spirit and scope of the present invention described in the claims below. Of course, modifications and variations are also included within the scope of the present invention.

Claims (6)

A central support ring protruding in a circumferential direction on a central portion perpendicular to the rotational axis direction of the roll on the outer circumferential surface of the roll tire coupled to the center roll or its outer circumferential surface and having grooves in the circumferential direction on both sides thereof; And, It is provided with an arcuate protrusion that surrounds the entire front portion, a part or all of the side surface of the center roll or the roll tire, and the whole of the center support ring, and is coupled to the groove on the inner side in a symmetrical manner based on the center support ring. The outer circumferential surface forms an arc shape, each of which is divided into a predetermined angle, the hot press comprising a plurality of segments that are bolted to the side of the center roll or roll tire to form the outermost cylindrical outer circumferential surface of the roll role. The method of claim 1, The center roll or the roll tire further includes a second groove in the circumferential direction on the side to which the segment is coupled, and the segment further includes a second arcuate portion on an arc corresponding to the second groove. Hot press roll. The method of claim 1, And the bolt further comprises a disc spring or a cone-shaped spring between the bolt and the segment. The method of claim 1, The central roll further includes a cooling water passage for supplying and recovering cooling water from a central portion thereof to the segment, wherein the segment further includes a segment cooling water passage connected to the cooling water passage and flowing the cooling water around the outermost surface of the segment. Hot press roll, characterized in that. The method of claim 4, wherein The segment cooling water passage further comprises a cooling tube installed therein and in contact with the inner surface of the hot press roll. The method of claim 5, And said segment is divided into half based on said segment cooling water passage, and is configured to include said cooling tube in said half divided segment.

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