Replacement method of fan-shaped segment and fan-shaped segment cooling water pipeline

Abstract

This application discloses a fan-shaped segment and a method for replacing the cooling water pipes of the fan-shaped segment, relating to the field of continuous casting technology. The fan-shaped segment includes: multiple sub-segments spaced apart along a first direction; multiple bearing seats, each sub-segment having a bearing seat at its top, and each bearing seat having a connecting hole extending along a second direction; multiple branch pipes, each sub-segment having a branch pipe on its surface along the first direction; and multiple connecting pipes extending along the second direction, one end of each connecting pipe connecting to a branch pipe, and at least a portion of the other end extending into the connecting hole. The end of the connecting pipe closest to the bearing seat and furthest from the sub-segment is welded to the inner wall of the connecting hole. The first and second directions intersect. This solution shifts the welding position from the bottom surface of the bearing seat to the top surface of the bearing seat, and after the pipes are changed to a plug-in connection, only a circumferential weld needs to be formed between the connecting pipe and the inner wall of the connecting hole, solving the problem that in the original structure, the weld was located in a confined space inside the frame, making repair welding and replacement impossible.

Description

Technical Field

[0001] This application relates to the field of continuous casting technology, and in particular to a fan-shaped section and a method for replacing the cooling water pipeline of the fan-shaped section. Background Technology

[0002] The sector section is one of the main pieces of equipment in the continuous casting process, used to guide the billet out and prevent the billet shell from bulging under the static pressure of molten steel. During operation, the billet comes into direct contact with rollers fixed to the equipment frame via bearing seats and bearings. To ensure the normal operation of the continuous casting machine, internal circulating cooling water is needed to cool key components such as rollers, mandrels, bearings, and bearing seats. The cooling water route consists of square steel pipes fixed to the equipment. These square steel pipes are arranged close to the bottom surface of the bearing seats and the main body of the sector section frame, and all the gate positions between the square steel pipes and the bottom surface of the bearing seats are open welds, resulting in long welds and high sealing requirements. During use, the cooling water route is susceptible to leakage due to corrosion and temperature expansion and contraction, and the narrow internal space of the sector section frame makes repair welding difficult. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a fan-shaped section and a method for replacing the fan-shaped section cooling water pipeline, so as to overcome the shortcomings of the difficulty in carrying out weld inspection and pipeline replacement in a narrow and confined space.

[0004] A first aspect of this application provides a sector segment, comprising: a plurality of sub-segments spaced apart along a first direction; a plurality of bearing seats, each sub-segment having a bearing seat at its top and a connecting hole extending along a second direction; a plurality of branch pipes, each sub-segment having a branch pipe on its surface in the first direction; and a plurality of connecting pipes extending along the second direction, one end of each connecting pipe being connected to a branch pipe, and at least a portion of the other end extending into a connecting hole, the end of the connecting pipe near the bearing seat away from the sub-segment being welded to the inner wall of the connecting hole; the first direction intersects the second direction.

[0005] In some embodiments, the branch pipe is spaced apart from the end face of the bearing housing near the sub-segment.

[0006] In some embodiments, the connecting hole is a stepped hole, and the connecting hole is sequentially connected with a first hole segment and a second hole segment along the second direction. The diameter of the first hole segment is larger than the diameter of the second hole segment. The end of the connecting pipe is located inside the second hole segment and is spaced apart from the first hole segment.

[0007] In some embodiments, the distance between the end of the connecting tube and the first hole segment is 3mm to 8mm.

[0008] In some embodiments, the top of the sub-segment is provided with multiple bearing seats, and multiple connecting pipes corresponding to the multiple bearing seats are connected to the branch pipe.

[0009] In some embodiments, the branch pipeline includes a first branch pipeline and a second branch pipeline, the first branch pipeline is connected to the second branch pipeline, the first branch pipeline extends along a third direction, the second branch pipeline extends along a second direction, and both the first branch pipeline and the second branch pipeline are connected to a connecting pipe; the third direction intersects with the first direction and the second direction respectively.

[0010] In some embodiments, the bearing housing is provided with two connecting holes distributed along a first direction. The two connecting holes are distributed on both sides of the sub-segment in the first direction. The sub-segment is provided with branch pipes on both sides of the first direction. The two branch pipes are respectively connected to the corresponding connecting holes through connecting pipes.

[0011] In some embodiments, the sector segment further includes an inlet pipe and an outlet pipe, and two branch pipes on both sides of the sub-segment in the first direction are respectively connected to the inlet pipe and the outlet pipe.

[0012] In some embodiments, the water outlet pipe is provided with a drain outlet, and the drain outlet is provided with an opening and closing device.

[0013] The second aspect of this application provides a method for replacing a cooling water pipe in a sector segment, applied to the aforementioned sector segment. The replacement method includes: removing the original branch pipe and the original connecting pipe, and cleaning the surface of the sub-segment; enlarging the original water hole of the bearing housing to form a connecting hole; butt welding the new branch pipe and the new connecting pipe together, and performing a pressure test; installing the branch pipe and the connecting pipe that have passed the pressure test into the sub-segment, and inserting the connecting pipe into the connecting hole; and welding the end of the connecting pipe near the bearing housing that is away from the sub-segment to the inner wall of the connecting hole.

[0014] In this application, branch pipes are attached to the surface of the sub-segment in the first direction, forming the main body of the cooling water channel to cool the rollers, spindle, bearings, and bearing housing. A connecting pipe extends along the second direction, with one end connected to the branch pipe, and at least a portion of the other end extending from the bottom of the bearing housing into the connecting hole. At the end closest to the bearing housing and furthest from the sub-segment (i.e., the top side of the bearing housing), it is welded to the inner wall of the connecting hole, shifting the welding position from the bottom to the top of the bearing housing. Furthermore, after the pipe is modified to a plug-in connection, only a circumferential weld needs to be formed between the connecting pipe and the inner wall of the connecting hole. The top of the bearing housing has an open space without frame obstruction, allowing welding to be performed even when the fan-shaped segment is finished. If leakage occurs later, the top weld can be directly repaired. After removing the top weld, the entire pipe can be removed and replaced, solving the problem in the original structure where the weld was located in a confined space inside the frame, making repair welding and replacement impossible. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the connection between the square steel pipe and the bearing housing; Figure 2A three-dimensional structural diagram of a sector segment provided in an embodiment of this application; Figure 3 A cross-sectional view of a sector segment provided in an embodiment of this application; Figure 4 A top view of a sector segment provided in an embodiment of this application; Figure 5 A flowchart illustrating the steps of a method for replacing a sector-shaped cooling water pipe, as provided in an embodiment of this application.

[0016] Figure label: 1. Sector-shaped section; 11. Sub-segment; 12. Bearing housing; 121. Connecting hole; 1211. First hole segment; 1212. Second hole segment; 13. Branch pipeline; 131. First branch pipeline; 132. Second branch pipeline; 14. Connecting pipe; 15. Inlet pipe; 16. Outlet pipe; 161. Sewage outlet; 2. Square steel pipe; X, First direction; Y, Third direction; Z, Second direction. Detailed Implementation

[0017] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0021] In the description of this application, "multiple" means two or more.

[0022] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0023] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0026] like Figure 1As shown, the billet is in direct contact with the rollers fixed to the equipment frame via the bearing housing 12 and the bearing. To ensure the normal operation of the continuous casting machine, key components such as the rollers, mandrel, bearings, and bearing housing 12 need to be cooled by internal circulating cooling water. The cooling water route consists of square steel pipes 2 fixed to the equipment. These square steel pipes 2 are arranged close to the bottom surface of the bearing housing 12 and the frame body of the fan-shaped section 1, and all the gate positions of the square steel pipes 2 and the bottom surface of the bearing housing 12 are welded with open welds, resulting in long welds and high sealing requirements.

[0027] like Figures 2-4 As shown, a first aspect of this application provides a sector segment 1, comprising: a plurality of sub-segments 11 spaced apart along a first direction X; a plurality of bearing seats 12, each bearing seat 12 having a connecting hole 121 extending along a second direction Z; a plurality of branch pipes 13, each branch pipe 13 having a branch pipe 13 on a surface of the sub-segment 11 in the first direction X; and a plurality of connecting pipes 14 extending along the second direction Z, one end of each connecting pipe 14 being connected to a branch pipe 13, and at least a portion of the other end extending into the connecting hole 121, the end of the connecting pipe 14 near the end face of the bearing seat 12 away from the sub-segment 11 being welded to the inner wall of the connecting hole 121; the first direction X intersects the second direction Z.

[0028] In one possible scenario, multiple segments 11 are arranged sequentially at intervals along a first direction X, with gaps between adjacent segments 11 for roller installation. All segments 11 together constitute the main frame of the sector segment 1. The rollers can be supported on the top of the segments 11 by bearings and bearing seats 12. The types of segments 11 include, but are not limited to, plate frames welded from steel plates, box frames welded from structural steel and steel plates, or integrally cast frames.

[0029] Each sub-segment 11 is topped with a bearing housing 12, which is positioned entirely above the sub-segment 11. The end face of the bearing housing 12 furthest from the sub-segment 11 (i.e., the top surface of the bearing housing 12) faces the external space of the fan-shaped segment 1, without any frame components obstructing it. The bearing housing 12 may have a connecting hole 121 extending or passing through along the second direction Z. One end of the connecting hole 121 extends to the top surface of the bearing housing 12, and the other end communicates with the cooling water chamber inside the bearing housing 12. A branch pipe 13 is disposed on the surface of the sub-segment 11 in the first direction X, i.e., the side of the sub-segment 11 facing the adjacent sub-segment 11. The branch pipe 13 may be attached to this surface. A connecting pipe 14 extends along the second direction Z and is located between the branch pipe 13 and the bearing housing 12. The branch pipe 13 may be a steel pipe with a square or circular cross-section, and its material may be stainless steel. The branch pipe 13 can be pressed against the surface of the sub-section 11 by multiple pipe clamps arranged at intervals along the length of the branch pipe 13. The pipe clamps are bolted to the sub-section 11, which is easy to disassemble; or the branch pipe 13 can be fixed to the surface of the sub-section 11 by spot welding or intermittent welding, which has high connection strength.

[0030] One end of the connecting pipe 14 is connected to and communicates with the branch pipe 13. At least a portion of the other end of the connecting pipe 14 extends into the connecting hole 121 from the side of the bearing housing 12 near the sub-section 11. After the connecting pipe 14 extends into the connecting hole 121, its end near the top surface of the bearing housing 12 is welded and fixed to the inner wall of the connecting hole 121. The weld can be a circumferential weld extending around the connecting pipe 14. Thus, cooling water sequentially enters the cooling water chamber in the bearing housing 12 through the branch pipe 13 and the connecting pipe 14, cooling the bearing, spindle, and bearing housing 12 before flowing out. The circumferential weld between the connecting pipe 14 and the inner wall of the connecting hole 121 can be performed using tungsten inert gas welding, resulting in a beautiful and dense weld; or it can be performed using shielded metal arc welding, which is simple to operate and highly adaptable to the site. Here, the first direction X can be the arrangement direction of multiple sub-segments 11, i.e., the casting direction of the billet; the second direction Z can be the height direction of the sector segment 1; the third direction Y is the direction that intersects the first direction X and the second direction Z respectively, such as the width direction of the billet. In the following embodiments, the first direction X and the second direction Z are perpendicular to each other, and the third direction Y is perpendicular to the first direction X and the second direction Z respectively, and the three constitute a spatial rectangular coordinate system.

[0031] Branch pipes 13 are attached to the side surface of sub-section 11, forming the main body of the cooling water circuit. Each connecting pipe 14 is led out from the branch pipe 13 and inserted upwards into the corresponding bearing seat 12, thereby distributing cooling water to each bearing seat 12. Compared with the original structure where the square steel pipe 2 is tightly attached to the bottom surface of the bearing seat 12 and welded to it, the piping system in this embodiment only forms a plug-in fit with the bearing seat 12 through the connecting pipe 14. The only weld point between the connecting pipe 14 and the bearing seat 12 is located on one side of the top surface of the bearing seat 12. Because the top surface of the bearing housing 12 faces the open space outside the sector segment 1, the welding torch can directly approach the welding position from above. Therefore, the annular weld can be performed even when the sector segment 1 is assembled as a finished product. If leakage occurs in the annular weld due to corrosion or temperature expansion and contraction in the later stages of use, maintenance personnel can directly repair the weld on the top surface. If the pipeline needs to be replaced, after cutting off the annular weld on the top surface, the branch pipeline 13 along with the connecting pipe 14 can be withdrawn downwards in the second direction Z, the ion section 11 can be disassembled, and the new pipeline can be reinstalled and re-welded on the top surface. The entire maintenance and replacement process does not require entering the narrow space inside the frame of the sector segment 1, completely solving the problem that the original structure's weld was located inside the frame, making repair welding and replacement impossible. This makes the cooling water circuit maintainable, thereby extending the overall service life of the sector segment 1. Furthermore, since only one circumferential weld needs to be formed between the connecting pipe 14 and the connecting hole 121, compared with the long strip-shaped open weld between the steel pipe 2 and the bottom surface of the bearing seat 12 in the original structure, the total length of the weld is greatly shortened, the number of leakage points is reduced, the sealing reliability is improved, and the welding workload is reduced accordingly.

[0032] like Figure 3 As shown, in some embodiments, the branch pipe 13 and the bearing housing 12 are spaced apart from each other near the end face of the sub-segment 11.

[0033] In one possible scenario, the bearing housing 12 can be mounted on top of the sub-segment 11, with its bottom surface either flush against the top surface of the sub-segment 11 or flush against a backing plate. The branch pipe 13 can be attached to the side surface of the sub-segment 11 and located below the bottom surface of the bearing housing 12, with a gap between the branch pipe 13 and the bottom surface of the bearing housing 12 in the second direction Z. A connecting pipe 14 spans this gap, with its lower end connected to the branch pipe 13 and its upper end extending upwards through the gap into the connecting hole 121 of the bearing housing 12. This gap ensures that the branch pipe 13 does not need to be flush against the bottom surface of the bearing housing 12, eliminating any weld seams between the branch pipe 13 and the bearing housing 12, thus completely eliminating the need for welding on the bottom surface of the bearing housing 12. Meanwhile, when the cooling water circuit is heated by water flow or cooled by water cut-off, resulting in thermal expansion and contraction, the cantilever pipe section can absorb axial expansion and contraction through its own slight bending deformation, reducing the thermal stress transmitted to the top annular weld and further delaying the fatigue cracking of the weld.

[0034] like Figure 3 As shown, in some embodiments, the connecting hole 121 is a stepped hole, and the connecting hole 121 is sequentially connected with a first hole segment 1211 and a second hole segment 1212 along the second direction Z. The diameter of the first hole segment 1211 is larger than the diameter of the second hole segment 1212. The end of the connecting pipe 14 is located inside the second hole segment 1212 and is spaced apart from the first hole segment 1211.

[0035] In one possible configuration, the connecting hole 121 is sequentially connected to a first hole segment 1211 and a second hole segment 1212 in the direction from the top surface of the bearing housing 12 toward the sub-segment 11. The diameter of the first hole segment 1211 is larger than that of the second hole segment 1212, and an annular stepped surface is formed between the two holes. That is, the first hole segment 1211 with a larger diameter is located on the side of the connecting hole 121 closer to the top surface of the bearing housing 12, and the second hole segment 1212 with a smaller diameter is located on the side of the connecting hole 121 closer to the sub-segment 11. The connecting tube 14 is inserted into the second hole segment 1212 from the bottom of the bearing housing 12, and the entire end of the connecting tube 14 is located inside the second hole segment 1212 and does not extend into the first hole segment 1211. The end face of the connecting tube 14 and the first hole segment 1211 are spaced apart in the second direction Z. The first hole segment 1211 and the second hole segment 1212 can both be cylindrical holes, with the two holes coaxially arranged and the stepped surface being an annular plane perpendicular to the second direction Z; or the first hole segment 1211 can be a cylindrical hole or a frustum-shaped hole with a chamfered opening. The chamfer or conical surface increases the welding space and guides the welding torch to be centered, which is more conducive to welding.

[0036] The second hole section 1212 is located at the bottom and has a smaller diameter, allowing it to form a small clearance fit or transition fit with the outer wall of the connecting pipe 14. After the connecting pipe 14 is inserted into the second hole section 1212, its hole wall provides radial positioning and support for the connecting pipe 14, ensuring good coaxiality between the connecting pipe 14 and the connecting hole 121. The first hole section 1211 is located at the top and has a larger diameter. Since the end of the connecting pipe 14 does not extend into the first hole section 1211, the first hole section 1211 forms an annular space open towards the top surface of the bearing seat 12 between the outer periphery of the end of the connecting pipe 14 and its own hole wall. This annular space constitutes a welding groove during welding. The aforementioned distance between the end face of the connecting pipe 14 and the first hole section 1211 serves two purposes: firstly, it prevents the molten welding material from overflowing the end face of the connecting pipe 14 and flowing into the cooling water cavity of the second hole section 1212 and even the bearing seat 12 during welding, thus avoiding weld beads and slag from entering the water passage and causing blockage or water pollution; secondly, it allows for a certain welding depth between the end face of the connecting pipe 14 and the stepped surface, enabling the weld metal to simultaneously fuse the outer wall and end face of the connecting pipe 14, and ensuring sufficient fusion length and fusion area between the weld and the connecting pipe 14, thereby guaranteeing welding strength and sealing reliability.

[0037] In addition, a sealing element may be provided, which surrounds the centerline of the first hole segment 1211 and is attached to the hole wall of the first hole segment 1211. The sealing element may be a plunger, a sealing ring, etc.

[0038] like Figure 3 As shown, in some embodiments, the distance between the end of the connecting pipe 14 and the first hole segment 1211 is 3mm to 8mm.

[0039] In one possible scenario, the distance between the end face of the connecting tube 14 and the first hole segment 1211 in the second direction Z is 3mm to 8mm. That is, after the connecting tube 14 is inserted into the second hole segment 1212, its end face stays inside the second hole segment 1212, at a distance of 3mm to 8mm from the step surface between the second hole segment 1212 and the first hole segment 1211. The end of the connecting tube 14 never extends into the first hole segment 1211. This spacing controls the fusion relationship between the circumferential weld and the end of the connecting pipe 14. The spacing is not less than 3mm, so that a small section of welding depth is left between the end face of the connecting pipe 14 and the stepped surface. During welding, the weld metal can simultaneously fuse the outer wall and end face of the end of the connecting pipe 14. The weld and the connecting pipe 14 have sufficient fusion length and fusion area, ensuring the connection strength and sealing reliability. If the spacing is less than 3mm, the end face of the connecting pipe 14 is too close to or even touches the platform stepped surface. The fusion length between the weld metal and the end of the connecting pipe 14 is too short, and the welding arc is likely to directly burn the thin wall of the end face of the connecting pipe 14, causing weld defects. On the other hand, the spacing is no more than 8mm, so that the end face of the connecting pipe 14 does not shrink too deeply into the second hole section 1212, the amount of weld metal to be filled in the first hole section 1211 is moderate, the welding heat input is small, the welding deformation is small, and the positioning support length of the end of the connecting pipe 14 is not weakened due to excessive insertion. If the spacing is greater than 8mm, the weld groove is too deep, the amount of weld metal filling is large, the number of welding layers is large, the welding efficiency decreases and the heat-affected zone expands.

[0040] like Figures 2-4 As shown, in some embodiments, the top of the sub-segment 11 is provided with a plurality of bearing seats 12, and the branch pipe 13 is connected to a plurality of connecting pipes 14 corresponding one-to-one with the plurality of bearing seats 12.

[0041] In one possible scenario, taking the sector section 1 of a slab continuous casting machine as an example, multiple bearing seats 12, such as 2, 3, or 6, can be installed at intervals along the third direction Y on the top of each sub-section 11, respectively supporting the ends of the corresponding rollers. Branch pipes 13 can be laid along the side surface of the sub-section 11, and a connecting pipe 14 is led out from the branch pipe 13 corresponding to the position of each bearing seat 12. Each connecting pipe 14 is inserted upward into the connecting hole 121 of its corresponding bearing seat 12, and a circumferential weld is formed on one side of the top surface of the bearing seat 12. One branch pipe 13 can simultaneously serve as a water supply header for multiple bearing seats 12. Branch pipe 13 serves as a common main pipe, integrating the water supply or return interfaces of multiple connecting pipes 14 onto a single pipeline. The assembly and welding between each connecting pipe 14 and branch pipe 13 can be completed entirely during the offline prefabrication stage: after assembling, welding, and pressure testing the branch pipe 13 with all connecting pipes 14 in an open area, it is then hoisted as a whole to sub-section 11. Each connecting pipe 14 is then aligned and inserted into the connection holes 121 of each bearing seat 12 in one go. Finally, only a circumferential weld needs to be applied to the top surface of each bearing seat 12. The amount of welding work on the installation site is minimized, and all on-site welding locations are situated in an open space above.

[0042] like Figures 2-4 As shown, in some embodiments, the branch pipe 13 includes a first branch pipe 13113 and a second branch pipe 13213. The first branch pipe 13113 and the second branch pipe 13213 are connected. The first branch pipe 13113 extends along a third direction Y, and the second branch pipe 13213 extends along a second direction Z. Both the first branch pipe 13113 and the second branch pipe 13213 are connected to a connecting pipe 14. The third direction Y intersects with the first direction X and the second direction Z, respectively.

[0043] In one possible scenario, the branch conduit 13 includes a first branch conduit 13113 and a second branch conduit 13213 that are interconnected: the first branch conduit 13113 extends along a third direction Y, and the second branch conduit 13213 extends along a second direction Z; both the first branch conduit 13113 and the second branch conduit 13213 may be connected to a connecting pipe 14. The first branch conduit 13113 may be laid transversely along the third direction Y on the surface of the sub-segment 11, for example, laid transversely along the lower part of the side surface of the sub-segment 11. The second branch conduit 13213 may be laid along the second direction Z on the surface of the sub-segment 11, for example, laid vertically along the edge of the side surface of the sub-segment 11; the ends of the two are interconnected, forming an L-shaped, Π-shaped, or grid-like conduit arrangement attached to the side surface of the sub-segment 11. The first branch pipe 13113 and the second branch pipe 13213 can be two independent straight pipes; or the first branch pipe 13113 and the second branch pipe 13213 can be formed by bending a single round pipe, eliminating the butt weld at the bend and reducing the number of leakage points. Through the three-dimensional combination of the first branch pipe 13113 and the second branch pipe 13213, the pipe routing is adapted to the shape of the side surface of the sub-segment 11, and cooling water can be delivered to the bearing seats 12 at different heights and horizontal positions on the side surface, allowing for flexible pipe layout. At the same time, the connection points of the two branch pipes 13 can be arranged in a relatively open and unobstructed position on the side surface, and their own butt welds and the butt welds of the connecting pipes 14 leading out from them can be completed in the offline prefabrication stage.

[0044] like Figures 2-4 As shown, in some embodiments, the bearing housing 12 is provided with two connecting holes 121 distributed along the first direction X. The two connecting holes 121 are distributed on both sides of the sub-segment 11 in the first direction X. The sub-segment 11 is provided with branch pipes 13 on both sides of the first direction X. The two branch pipes 13 are respectively connected to the corresponding connecting holes 121 through connecting pipes 14.

[0045] In one possible scenario, each bearing housing 12 may be provided with two connecting holes 121 distributed along the first direction X, with the two connecting holes 121 located on both sides of the sub-segment 11 in the first direction X. Correspondingly, each surface of the sub-segment 11 in the first direction X is provided with a branch pipe 13, and the two branch pipes 13 are respectively connected to the corresponding connecting holes 121 through their respective connecting pipes 14. The bearing housing 12 may be installed on the top of the sub-segment 11 and spans the sub-segment 11 along the first direction X. The two connecting holes 121 are both opened on the top surface of the bearing housing 12 and are arranged on both sides of the sub-segment 11 along the first direction X, that is, one connecting hole 121 is closer to one side of the sub-segment 11, and the other connecting hole 121 is closer to the other side of the sub-segment 11. Each of the two connecting holes 121 communicates with the cooling water cavity inside the bearing housing 12. The branch pipes 13 on both sides of sub-segment 11 extend along the third direction Y. Each branch pipe 13 has a connecting pipe 14 corresponding to the position of each bearing housing 12. The connecting pipe 14 extends upward along the second direction Z, inserts into the corresponding connecting hole 121 from the bottom of the bearing housing 12, and is welded to the inner wall of the connecting hole 121 on one side of the top surface of the bearing housing 12, forming an annular weld. Cooling water enters the cooling water chamber of the bearing housing 12 from one side of the branch pipe 13 via the connecting pipe 14, traverses the cooling water chamber, and then flows out from the connecting hole 121 on the other side through the connecting pipe 14 on the other side into the branch pipe 13 on the other side. The two connecting holes 121 can be arranged symmetrically about the bearing housing 12 along the first direction X, ensuring balanced water inlet and outlet resistance. The two connecting holes 121 are appropriately offset along the third direction YY to avoid other components at the roller end. The branch pipes 13 on both sides can be symmetrical in structure and identical in specifications for easy spare parts interchangeability; alternatively, different pipe diameters can be used depending on the temperature difference between the inlet and outlet water.

[0046] For each bearing housing 12, cooling water enters from one side of the connection hole 121 and flows out from the other side of the connection hole 121. The water flow is directional and runs across the entire cooling water cavity, eliminating any stagnant water areas. This ensures uniform cooling of the bearing housing 12 and its internal bearings and spindles, preventing scale and impurities from accumulating within the cavity. The inlet and outlet water outlets are symmetrically arranged, balancing the thermal deformation of the pipes and minimizing the additional stress on the top annular weld. Furthermore, since both connection holes 121 are located on the top surface of the bearing housing 12 and face an open space, both annular welds can be welded and repaired from above while the sector segment 1 is in its finished state. Additionally, the branch pipe 13 extending along the third direction Y can simultaneously serve as a common main pipe for multiple bearing housings 12 arranged in that direction. One branch pipe 13 can supply all bearing housings 12 on one side, resulting in a neat pipe layout and a small number of pipes. In another possible scenario, the top surface of the bearing housing 12 located at both ends of the sub-segment 11 along the third direction Y can be provided with three orifices: two of them are connecting holes 121 distributed along the first direction X, which are arranged in the same way as the intermediate bearing housings 12, and are respectively connected to the branch pipes 13 on both sides of the sub-segment 11 through connecting pipes 14. The third connecting hole 121 communicates with the second branch pipe 13213 extending along the second direction Z. The second branch pipe 13213 supplies water to the cooling water chamber of the end bearing housing 12 through the third connecting hole 121. The end bearing housing 12 thus also serves as a water distribution node between the second branch pipe 13213 and the first branch pipe 13113. After the cooling water enters the cooling water chamber of the end bearing housing 12 from the second branch pipe 13213, it is then distributed to the first branch pipe 13113 through the connecting pipe 14 and sent to the intermediate bearing housings 12 (the return flow is in the opposite direction).

[0047] like Figure 2 As shown, in some embodiments, the sector segment 1 further includes an inlet pipe 15 and an outlet pipe 16, and the two branch pipes 13 on both sides of the sub-segment 11 in the first direction X are respectively connected to the inlet pipe 15 and the outlet pipe 16.

[0048] In one possible scenario, the sector segment 1 may further include an inlet pipe 15 and an outlet pipe 16, with the two branch pipes 13 on both sides of the first direction XX connected to the inlet pipe 15 and the outlet pipe 16 respectively.

[0049] Branch pipe 13 located on one side of sub-segment 11 can serve as the inlet-side main pipe, with its end connected to the inlet pipe 15; branch pipe 13 located on the other side of sub-segment 11 can serve as the outlet-side main pipe, with its end connected to the outlet pipe 16. Cooling water enters the inlet-side main pipe from the inlet pipe 15, and is then sent to the cooling water chambers of each bearing housing 12 via connecting pipes 14 on that side. After traversing the cooling water chambers, it flows through connecting pipes 14 on the other side and converges into the outlet-side main pipe, finally being discharged through the outlet pipe 16, thus forming a complete cooling circuit from the inlet main pipe to the parallel bearing housings 12 to the outlet main pipe. Both the inlet pipe 15 and the outlet pipe 16 can be rigid metal pipes, connected to the corresponding interfaces of the workshop cooling water system via flanges, ensuring reliable connection and high pressure resistance; alternatively, the ends of the inlet pipe 15 and the outlet pipe 16 can be connected to the workshop water system via high-pressure metal hoses, which can compensate for installation errors and relative displacements between the sector segment 1 and the external pipelines. The inlet and outlet interfaces can be located at the same end for convenient centralized piping, or they can be located at opposite ends to avoid crossing. Each bearing housing 12 is connected in parallel between the inlet and outlet main pipes. Changes in the water resistance of any bearing housing 12 will not affect the water supply of other bearing housings 12. In case of leakage or blockage, it is easy to troubleshoot in sections. With the structure that allows the top annular weld to be cut off and the pipeline to be removed as a whole, the entire main pipe on one side can be replaced together with the inlet pipe 15 or the outlet pipe 16, further shortening the maintenance time.

[0050] like Figure 2 As shown, in some embodiments, the water outlet pipe 16 is provided with a drain outlet 161, and the drain outlet 161 is provided with an opening and closing device.

[0051] The drain port 161 can be located at the lowest point or end of the outlet pipe 16, and an opening and closing device is connected to the drain port 161. During normal operation, the opening and closing device is closed, and the cooling water circuit operates in a closed loop. During maintenance or when the water quality deteriorates, the opening and closing device is opened, and the inlet water pressure drives the water flow to flush the entire water circuit, discharging rust, scale, and impurities deposited at the lowest point of the pipe from the drain port 161, thus achieving online drainage. The opening and closing device can be a stop valve, a ball valve, or a plug screwed to the drain port 161. There can be one drain port 161, located at the end of the outlet pipe 16; or multiple drain ports can be located at various low points. The drain port 161 and the opening and closing device enable the cooling water circuit to have online drainage capabilities, allowing impurities in the water circuit to be periodically discharged. This solves the problem of impurities accumulating and clogging in the original closed water circuit, ensuring the quality and flow rate of the cooling water and maintaining a stable cooling effect. The sewage discharge operation can be completed outside the sector section 1 without disassembling any pipelines. Combined with the top surface welding and the overall replaceable structure, the service life of the sector section 1 is extended.

[0052] The end of the connecting pipe 14 near the bearing seat 12 and away from the sub-segment 11 is tightened and fitted against the wall of the connecting hole 121.

[0053] In one possible scenario, after the connecting pipe 14 is inserted into the connecting hole 121 but before welding, the insertion end of the connecting pipe 14 is expanded: an expander is inserted into the end of the connecting pipe 14, applying a radially outward expansion force to its wall, causing plastic deformation at the end, expanding the wall outward, and tightly fitting against the wall of the connecting hole 121; after the expander is removed, the end of the connecting pipe 14 retains its plastically deformed shape, forming a tightly fitted mechanical connection with the wall of the connecting hole 121, and then a circumferential weld is formed on one side of the top surface of the bearing seat 12. The entire insertion section of the connecting pipe 14 can be expanded and tightly fitted against the wall of the connecting hole 121, resulting in a large contact area and a strong connection; alternatively, a section of the connecting pipe 14 near the top surface of the bearing seat 12 can be expanded and tightly fitted, while the remaining insertion sections maintain a small gap with the wall of the connecting hole 121, balancing positioning reliability and ease of assembly and disassembly. The expansion joint is located at the insertion end of the connecting pipe 14, which is the welding section where the annular weld will subsequently form. The expansion joint creates a mechanical connection between the connecting pipe 14 and the bearing housing 12 before welding, eliminating the assembly gap between the connecting pipe 14 and the wall of the connecting hole 121. This ensures a stable molten pool during welding, preventing defects such as burn-through, incomplete fusion, or porosity caused by excessive gaps, thus guaranteeing the tightness and forming quality of the annular weld. Furthermore, the expansion joint's mating surface pre-positions and fixes the connecting pipe 14 before welding, maintaining coaxiality with the connecting hole 121 without additional clamping fixtures. During construction, some of the vibration and water pressure loads on the pipeline are borne by the expansion joint mating surface, reducing the stress on the annular weld and delaying fatigue cracking. In addition, the expansion joint eliminates the gap between the connecting pipe 14 and the hole wall, preventing impurities in the cooling water from accumulating in the gap and inhibiting crevice corrosion.

[0054] like Figure 5 As shown, a second aspect of this application provides a method for replacing the cooling water pipe of the sector segment 1, applied to the aforementioned sector segment 1. The replacement method includes: Step S1: Remove the original branch pipe 13 and the original connecting pipe 14, and clean the surface of the sub-segment 11; In one possible scenario, this embodiment provides a method for replacing the cooling water pipe in the sector segment 1, applicable to the sector segment 1 in any of the above embodiments. This method is used to convert the original open-welded water circuit into the plug-in top-welded water circuit of this application, or to replace corroded pipes during later maintenance. The original branch pipe 13 and original connecting pipe 14 are removed, and the surface of the sub-segment 11 is cleaned. After water supply is stopped, the branch pipe 13 is cut off and removed from the sub-segment 11. Residual weld spatter, rust, and impurities on the surface of the sub-segment 11 are ground and cleaned to make the surface of the sub-segment 11 smooth, providing a clean mounting base for the installation and fixing of the new branch pipe 13.

[0055] Step S2: Enlarge the raw water hole of the bearing housing 12 to form a connecting hole 121; In one possible scenario, the original water hole of the bearing housing 12 is enlarged to form a connecting hole 121. The enlargement is performed using the original water hole as a reference, ensuring that the enlarged connecting hole 121 can accommodate the insertion of the connecting pipe 14, and that the inner diameter of the connecting pipe 14 after insertion matches the original water passage diameter, guaranteeing that the cooling water flow rate remains unchanged before and after the modification. Enlargement can be performed on a radial drilling machine or a boring machine; after enlargement, reaming is performed to improve the dimensional accuracy and surface quality of the connecting hole 121, providing a good mating surface for subsequent welding. When the connecting hole 121 adopts a stepped hole design, this step also includes machining a first hole segment 1211 with a larger diameter from one side of the top surface of the bearing housing 12, such that a second hole segment 1212 with a smaller diameter is located on the side closer to the sub-segment 11, and the first hole segment 1211 with a larger diameter is located on the side closer to the top surface of the bearing housing 12.

[0056] Step S3: Weld the new branch pipe 13 to the new connecting pipe 14 together and perform a pressure test; In one possible scenario, the new branch pipe 13 and the new connecting pipe 14 are butt-welded together and pressure tested. In an open area, the prefabricated connecting pipes 14 are butt-welded to the branch pipes 13 according to the drawing positions to form an integrated piping unit. Then, a pressure test is performed on the integrated piping unit: all ports of the piping unit are sealed, and the insertion end of the connecting pipe 14 can be sealed with tooling. Water is injected from the inlet end and pressurized, and pressure is maintained to check for leaks at each weld joint. The test pressure is 2 MPa, and the pressure holding time is no less than 4 hours. The weld joints are inspected using a standard higher than the actual working pressure to ensure the sealing reliability of the piping unit after it is put into operation.

[0057] Step S4: Install the branch pipe 13 and connecting pipe 14 that have passed the pressure holding test to the sub-section 11, and insert the connecting pipe 14 into the connecting hole 121; In one possible scenario, the branch pipe 13 and connecting pipe 14, having passed the pressure holding test, are installed onto the sub-section 11, with the connecting pipe 14 inserted into the connecting hole 121. The tested and qualified integral piping unit is hoisted to the side surface of the sub-section 11, aligning each connecting pipe 14 with its corresponding connecting hole 121. Simultaneously, each connecting pipe 14 is inserted into the connecting hole 121 of each bearing seat 12 from the bottom to the top. When using a stepped hole design, the insertion depth is controlled so that the entire end of the connecting pipe 14 is located within the second hole section 1212, with its end face maintaining a distance of 3mm to 8mm from the first hole section 1211. After insertion, the branch pipe 13 is fixed to the surface of the sub-section 11 using pipe clamps or spot welding. Before welding, the insertion ends of each connecting pipe 14 are expanded: the expansion tool is inserted into the end of the connecting pipe 14, causing the end of the connecting pipe 14 to undergo plastic deformation and fit tightly against the inner wall of the connecting hole 121; the expansion eliminates the assembly gap between the connecting pipe 14 and the hole wall, making the weld pool stable and less prone to burn-through or incomplete fusion during subsequent welding, thus improving the density of the weld; on the other hand, it allows the connecting pipe 14 to form a mechanical connection with the bearing seat 12 in advance, reducing the stress on the weld during service.

[0058] Step S5: Weld the end of the connecting pipe 14 that is close to the end face of the bearing seat 12 away from the sub-segment 11 to the inner wall of the connecting hole 121.

[0059] In one possible scenario, the end of the connecting pipe 14 closest to the bearing housing 12 and furthest from the sub-section 11 is welded to the inner wall of the connecting hole 121. On one side of the top surface of the bearing housing 12, the end of each connecting pipe 14 is welded to the connecting hole 121, which can be done using tungsten inert gas welding. After all circumferential welds are completed, the entire water circuit can be pressure-tested again to confirm there are no leaks before being put into operation.

[0060] In the method for replacing the cooling water pipe of the sector segment 1 provided in this application, the branch pipe 13 is attached to the surface of the sub-segment 11 in the first direction X to form the main body of the cooling water circuit, thereby achieving cooling of the roller, mandrel, bearing and bearing seat 12. The connecting pipe 14 extends along the second direction Z, with one end connected to the branch pipe 13, and at least part of the other end extending from the bottom of the bearing seat 12 into the connecting hole 121. At the end near the end face of the bearing seat 12 away from the sub-segment 11, that is, the top side of the bearing seat 12, it is welded to the inner wall of the connecting hole 121, so that the welding position is transferred from the bottom surface of the bearing seat 12 to the top surface of the bearing seat 12. After the pipe is changed to a plug connection, only one circumferential weld seam needs to be formed between the connecting pipe 14 and the inner wall of the connecting hole 121. The bearing housing 12 has an open top space without frame obstruction, and the weld can be performed in the finished state of the sector segment 1. If the weld leaks later, the top weld can be directly repaired by welding. After the top weld is removed, the entire pipeline can be removed and replaced. This solves the problem that the weld is located in a narrow space inside the frame in the original structure, making it impossible to repair or replace it, thereby extending the service life of the sector segment 1.

[0061] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0062] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0063] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0064] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A sector-shaped segment, characterized in that, include: Multiple sub-segments are spaced apart along the first direction; Multiple bearing housings, the top of the sub-segment is provided with the bearing housing, and the bearing housing is provided with a connecting hole extending in a second direction; Multiple branch pipes, wherein the sub-segment has the branch pipes on its surface in the first direction; Multiple connecting pipes extend along the second direction, one end of each connecting pipe is connected to the branch pipe, and at least a portion of the other end extends into the connecting hole. The end of each connecting pipe near the bearing seat and away from the sub-segment is welded to the inner wall of the connecting hole. The first direction intersects with the second direction.

2. The sector segment according to claim 1, characterized in that, The branch pipe is spaced apart from the end face of the bearing housing near the sub-segment.

3. The sector segment according to claim 1, characterized in that, The connecting hole is a stepped hole, and the connecting hole is sequentially connected with a first hole segment and a second hole segment along the second direction. The diameter of the first hole segment is larger than the diameter of the second hole segment. The end of the connecting pipe is located within the second hole segment and is spaced apart from the first hole segment.

4. The sector segment according to claim 3, characterized in that, The distance between the end of the connecting pipe and the first hole section is 3mm to 8mm.

5. The sector segment according to any one of claims 1-4, characterized in that, The top of the sub-segment is provided with multiple bearing seats, and the branch pipe is connected to multiple connecting pipes that correspond one-to-one with the multiple bearing seats.

6. The sector segment according to any one of claims 1-4, characterized in that, The branch pipeline includes a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the second branch pipeline. The first branch pipeline extends along a third direction, and the second branch pipeline extends along a second direction. Both the first branch pipeline and the second branch pipeline are connected to the connecting pipe. The third direction intersects with the first direction and the second direction, respectively.

7. The sector segment according to any one of claims 1-4, characterized in that, The bearing housing is provided with two connecting holes distributed along the first direction. The two connecting holes are distributed on both sides of the sub-segment in the first direction. The sub-segment is provided with branch pipes on both sides of the first direction. The two branch pipes are respectively connected to the corresponding connecting holes through the connecting pipes.

8. The sector segment according to claim 7, characterized in that, Also includes: The inlet pipe and the outlet pipe, and the two branch pipes on both sides of the sub-segment in the first direction are respectively connected to the inlet pipe and the outlet pipe.

9. The sector segment according to claim 8, characterized in that, The water outlet pipe is equipped with a drain outlet, and the drain outlet is equipped with an opening and closing device.

10. A method for replacing a fan-shaped section of cooling water pipe, characterized in that, Applied to the sector segment as described in any one of claims 1 to 9, the replacement method includes: Remove the original branch pipes and original connecting pipes, and clean the surface of the sub-section; The original water hole of the bearing housing is enlarged to form the connecting hole; The new branch pipe is welded to the new connecting pipe assembly and pressure testing is performed. Install the branch pipe and the connecting pipe that have passed the pressure holding test to the sub-section, and insert the connecting pipe into the connecting hole; The end of the connecting pipe near the bearing seat, away from the end face of the sub-segment, is welded to the inner wall of the connecting hole.

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