A shunt structure, laminar cooling equipment and strip hot rolling system

Abstract

The utility model provides a kind of shunting structure, laminar cooling equipment and strip steel hot rolling system, it is related to hot rolling technical field.Shunting structure includes shunting block, plunger, sealing ring, the shunting block includes main water hole and multiple shunt holes with the main water hole communication, one end of the main water hole is used to with main water pipe communication, multiple the shunt hole is spaced distribution along the axial direction of the main water hole, every the shunt hole is used to with corresponding gooseneck pipe communication;The plunger is inserted into the main water hole from the other end of the main water hole away from the main water pipe, and with the main water hole gap cooperation, and the plunger can be axially moved along the main water hole;The sealing ring is sleeved in the plunger, and the outer peripheral wall of the sealing ring is slidably connected with the inner wall of the main water hole.

Description

Technical Field

[0001] This utility model relates to the field of hot rolling technology, and more specifically, to a flow splitting structure, laminar flow cooling equipment, and hot rolling system for strip steel. Background Technology

[0002] After hot rolling, strip steel needs to be cooled. The common cooling method is to use laminar flow cooling equipment for water cooling, that is, to arrange water pipes above the strip steel conveyor rollers.

[0003] During cooling, multiple gooseneck pipes are installed axially along the water pipes, and cooling water flowing out of the gooseneck pipes sprays and cools the strip steel. However, when cooling requirements change, such as when the strip steel width changes, the spray range cannot be flexibly adjusted, resulting in a waste of water resources. Utility Model Content

[0004] The problem this invention solves is: how to flexibly adjust the spray range of cooling water in the width direction of the strip conveyor rollers.

[0005] To address the aforementioned problems, this utility model provides a diversion structure, comprising a diversion block, a plunger, and a sealing ring. The diversion block includes a main water inlet and multiple diversion holes communicating with the main water inlet. One end of the main water inlet is used to communicate with a main water pipe. The multiple diversion holes are spaced apart along the axial direction of the main water inlet, and each diversion hole is used to communicate with a corresponding gooseneck pipe. The plunger extends into the main water inlet from the end away from the main water pipe and is clearance-fitted with the inner wall of the main water inlet. The plunger is movable along the axial direction of the main water inlet. The sealing ring is sleeved on the plunger, and the outer peripheral wall of the sealing ring is slidably connected to the inner wall of the main water inlet.

[0006] Optionally, the sealing ring is provided with a first impurity receiving groove at one end facing the main water pipe, and the opening of the first impurity receiving groove faces the main water pipe.

[0007] Optionally, the width of the first impurity-containing annular groove gradually decreases from the groove opening to the bottom of the groove.

[0008] Optionally, the first impurity-containing annular groove includes a sidewall near its outer ring, and the end of the sidewall facing the direction of water flow is provided with a chamfer.

[0009] Optionally, the plunger includes a positioning groove that is connected to the sealing ring.

[0010] Optionally, it also includes a sealing ring support, which is sleeved on the plunger and connected to the end of the sealing ring away from the main water pipe. The sealing ring support is slidably engaged with the inner wall of the main water inlet.

[0011] Optionally, the system further includes a plunger support, which is sleeved on the plunger and located on the side of the sealing ring opposite to the main water pipe, spaced apart from the sealing ring. The plunger support slides against the inner wall of the main water inlet. Optionally, it also includes a filter structure located at the inlet end of the main water inlet and connected to the diverter block, and / or the filter structure located at the outlet end of the main water pipe and connected to the main water pipe.

[0012] Compared with related technologies, the diversion structure of this utility model uses multiple diversion holes distributed axially at intervals along the main water passage and connected to the main water passage. Each diversion hole is used to connect to a corresponding gooseneck tube, allowing cooling water flowing into the main water passage to flow to the corresponding gooseneck tube through multiple diversion holes. The axial distribution of multiple diversion holes along the main water passage allows for cooling water spraying along the width of the strip conveyor rollers. One end of the main water passage is connected to the main water pipe, and a plunger extends into the main water passage from the end furthest from the main water pipe, fitting with the main water passage with a clearance. This ensures a tight fit between the plunger and the inner wall of the main water passage. A certain gap is left to reduce the risk of impurities in the water scratching the plunger surface, thereby extending the plunger's service life. A sealing ring is then fitted onto the plunger, with its outer circumferential wall slidingly connected to the inner wall of the main water passage. The sealing ring achieves indirect contact between the plunger and the main water passage, and it can also seal the gap between the plunger and the inner wall of the main water passage, preventing cooling water from flowing through the gap. The position of the sealing ring within the main water passage can be adjusted by moving the plunger axially along the main water passage, thereby adjusting the number of diversion holes that can carry water, and flexibly adjusting the spray range of cooling water in the width direction of the strip conveyor rollers.

[0013] In another aspect, this utility model also provides a laminar flow cooling device, including a main water pipe and a diversion structure as described above, wherein the main water pipe and the main water inlet of the diversion structure are connected.

[0014] This laminar flow cooling equipment has all the beneficial effects of this flow splitting structure, which will not be elaborated here.

[0015] In another aspect, this utility model also provides a hot strip rolling system, including a strip conveying roller table and a laminar flow cooling device as described above. The laminar flow cooling device is located above the strip conveying roller table, and the main water passage in the laminar flow cooling device extends along the width direction of the strip conveying roller table.

[0016] This hot strip rolling system has all the beneficial effects of the laminar flow cooling equipment, which will not be elaborated here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the diversion block in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the sealing ring and sealing ring support on the plunger in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1-Diverter block; 11-Main water passage; 12-Diverter hole; 2-Plunger; 3-Sealing ring; 31-First impurity receiving ring groove; 311-Side wall; 3111-Chamfer; 4-Sealing ring support; 5-Plunger support. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] In the attached diagram, the X-axis represents the horizontal position, with the positive direction of the X-axis (where the arrow points) indicating the right side and the negative direction (opposite to the positive direction) indicating the left side. Similarly, the Z-axis represents the vertical position, with the positive direction of the Z-axis (where the arrow points) indicating the top and the negative direction (opposite to the positive direction) indicating the bottom. It should be noted that the aforementioned representations of the X and Z axes are for ease of description and simplification of the invention, and do not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0022] Combination Figure 1 and Figure 2 As shown, this utility model embodiment provides a diversion structure, including a diversion block 1, a plunger 2, and a sealing ring 3. The diversion block 1 includes a main water inlet 11 and a plurality of diversion holes 12 communicating with the main water inlet 11. One end of the main water inlet 11 is used to communicate with the main water pipe. The plurality of diversion holes 12 are distributed at intervals along the axial direction of the main water inlet 11, and each diversion hole 12 is used to communicate with the corresponding gooseneck pipe. The plunger 2 extends into the main water inlet 11 from the end away from the main water pipe and is in clearance fit with the inner wall of the main water inlet 11. The plunger 2 can move along the axial direction of the main water inlet 11. The sealing ring 3 is sleeved on the plunger 2, and the outer peripheral wall of the sealing ring 3 is slidably connected to the inner wall of the main water inlet 11.

[0023] Specifically, both the main water pipe and the diversion block 1 are located above the strip conveyor roller table. The diversion block 1 is connected to the main water pipe, and the main water inlet 11 of the diversion block 1 extends along the width direction of the strip conveyor roller table. Multiple diversion holes 12 are distributed axially at intervals along the main water inlet 11; that is, multiple diversion holes 12 and their corresponding gooseneck pipes also extend along the width direction of the strip conveyor roller table. Figure 1 As shown, Figure 1 This is a partial cross-sectional view of the diversion block 1 in this embodiment. The negative Y-axis is the counter-flow direction, which is also the water inlet end of the main water inlet 11. The water inlet end of the main water inlet 11 is connected to the main water pipe through a flange. The positive Y-axis is the water flow direction, i.e., the downstream direction, which is also the end where the plunger 2 is connected to the main water inlet 11. The diversion holes 12 are connected to the main water inlet 11 radially. Multiple diversion holes 12 are distributed at intervals along the axial direction of the main water inlet 11. Each diversion hole 12 is connected to the corresponding gooseneck pipe. When water enters the diversion hole 12, the corresponding gooseneck pipe sprays cooling water onto the strip.

[0024] The plunger 2 extends into the main water inlet 11 from the end away from the main water pipe. A sealing ring 3 is fitted onto the plunger 2, and the outer peripheral wall of the sealing ring 3 (the side wall away from the axis of the sealing ring 3) slides against the inner wall of the main water inlet 11. The plunger 2 can move axially along the main water inlet 11, exemplarily by being driven by a cylinder. The diversion block 1 can be divided into a front half region away from the main water pipe and a rear half region close to the main water pipe along the water flow direction. Both the front and rear half regions include multiple diversion holes 12. When it is not necessary to adjust the spray range of cooling water in the width direction of the strip conveyor roller, the sealing ring 3 of the plunger 2 can be located at the front end of the diversion block 1 (i.e., the end away from the main water pipe), so that the multiple diversion holes 12 in the front and rear half regions can be connected to the main water pipe through the main water inlet 11, that is, water can be discharged from the diversion holes 12 in both the front and rear half regions. At this time, the cooling water spray range is the largest. When it is necessary to adjust the spray range of cooling water in the width direction of the strip conveyor rollers, the plunger 2 moves against the current, and the sealing ring 3 gradually blocks the water flow from the main water inlet 11 to the branch outlet 12. The specific moving distance of the plunger 2 can be adjusted as needed. For example, when the sealing ring 3 moves between the front and rear half of the region, only the multiple branch outlets 12 in the rear half of the region are connected to the main water pipe through the main water inlet 11, that is, only the branch outlets 12 in the rear half of the region can output water. When the distance of the plunger 2 moving against the current is the maximum, the cooling water spray range is the minimum. By using the axial movement of the plunger 2 along the main water inlet 11, the position of the sealing ring 3 within the main water inlet 11 can be adjusted, that is, the number of branch outlets 12 that can receive water flow can be adjusted, thereby satisfying the adjustment of the cooling water spray range. It should be understood that the proportions shown in the attached figure are only for principle reference and the proportions in actual use can be adjusted accordingly.

[0025] Therefore, in this embodiment, multiple diversion holes 12 are distributed axially at intervals along the main water passage 11 and communicate with the main water passage 11. Each diversion hole 12 is used to communicate with the corresponding gooseneck tube, so that the cooling water flowing into the main water passage 11 can flow to the corresponding gooseneck tube through the multiple diversion holes 12. By utilizing the multiple diversion holes 12 distributed axially at intervals along the main water passage 11, cooling water can be sprayed along the width direction of the strip conveyor roller. One end of the main water passage 11 is connected to the main water pipe, and the plunger 2 extends into the main water passage 11 from the other end away from the main water pipe. 11, and with a clearance fit with the main water passage 11, that is, there is a certain gap between the plunger 2 and the inner wall of the main water passage 11. Then, the sealing ring 3 is sleeved on the plunger 2, and the outer peripheral wall of the sealing ring 3 is slidably connected to the inner wall of the main water passage 11. The sealing ring 3 can play a sealing and isolation role in different areas within the main water passage 11. Furthermore, by moving the plunger 2 along the axial direction of the main water passage 11, the position of the sealing ring 3 within the main water passage 11 can be adjusted, that is, the number of diversion holes 12 that can flow with the main water pipe can be adjusted, so as to flexibly adjust the spray range of cooling water in the width direction of the strip conveyor roller.

[0026] It is understandable that during long-term use, impurities in the water may remain on the inner wall of the main water inlet 11. If the plunger 2 is directly and slidably fitted with the main water inlet 11, its surface is easily scratched by impurities when it slides back and forth relative to the main water inlet 11. In this embodiment, the plunger 2 is fitted with the main water inlet 11 with a clearance, which leaves a certain gap between the plunger 2 and the inner wall of the main water inlet 11. This avoids the risk of impurities in the water scratching the surface of the plunger 2 when it slides relative to the main water inlet 11, thus extending its lifespan. The service life of plunger 2; and, compared with the direct sealing fit between plunger 2 and main water passage 11, the sealing fit between sealing ring 3 and main water passage 11 is better, which can improve the flow distribution effect inside the flow distribution structure; in addition, the replacement of sealing ring 3 is relatively simple and less expensive than the replacement of plunger 2. When the sealing effect of sealing ring 3 is found to be reduced, sealing ring 3 can be replaced separately without disassembling the whole machine and then replacing plunger 2, which saves maintenance time and has relatively low maintenance costs.

[0027] Optionally, combined Figure 2 As shown, a first impurity receiving ring groove 31 is provided at the end of the sealing ring 3 facing the main water pipe, and the opening of the first impurity receiving ring groove 31 faces the main water pipe.

[0028] Specifically, the main water pipe is connected to the end of the main water pipe 11 facing the negative Y-axis, and the end of the sealing ring 3 facing the main water pipe refers to the end of the sealing ring 3 facing the negative Y-axis. When the water phase in the main water pipe flows in the positive Y-axis direction, under the action of the water flow, fine sand in the water can move to the first impurity receiving ring groove 31, where the first impurity receiving ring groove 31 stores the fine sand in the water, so as to avoid fine sand remaining between the plunger 2 and the main water passage 11 and causing scratches to the plunger 2.

[0029] Thus, a first impurity receiving ring groove 31 is provided at the end of the sealing ring 3 facing the main water pipe. The opening of the first impurity receiving ring groove 31 faces the main water pipe. Fine sand in the water can move into the first impurity receiving ring groove 31 and be temporarily stored in the first impurity receiving ring groove 31 to avoid fine sand in the water remaining between the plunger 2 and the main water passage 11, which would cause scratches to the plunger 2.

[0030] Optionally, combined Figure 2 As shown, the width of the first impurity receiving ring groove 31 gradually decreases from the groove opening to the bottom of the groove.

[0031] Specifically, the first impurity receiving annular groove 31 is annular in shape. The width of the first impurity receiving annular groove 31 gradually decreases along the water flow direction. The straight distance between the two inner walls of the first impurity receiving annular groove 31 gradually decreases along the water flow direction. The cross-sectional shape of the first impurity receiving annular groove 31 in its circumferential direction is similar to a trumpet shape. The end with the larger diameter of the trumpet shape is the opening of the first impurity receiving annular groove 31. When the water flow washes the first impurity receiving annular groove 31, the water flow can wash out the fine sand impurities at the deepest part of the first impurity receiving annular groove 31, so as to facilitate the cleaning of the first impurity receiving annular groove 31.

[0032] Thus, the width of the first impurity receiving annular groove 31 gradually decreases along the water flow direction, and the cross-sectional shape of the first impurity receiving annular groove 31 in its circumferential direction is similar to a trumpet shape. When the water flow washes the first impurity receiving annular groove 31, it is convenient to wash out the fine sand impurities at the deepest part of the first impurity receiving annular groove 31, so as to facilitate the cleaning of the first impurity receiving annular groove 31.

[0033] Optionally, combined Figure 2 As shown, the first impurity receiving ring groove 31 includes a side wall 311 near its outer ring, and the end of the side wall 311 facing the water flow direction is provided with a chamfer 3111.

[0034] Specifically, the first impurity receiving annular groove 31 is annular in shape. The sidewall of the first impurity receiving annular groove 31 away from its axis is the sidewall 311 of the outer ring. The end of the sidewall 311 facing the water flow direction is the front end of the outer wall of the first impurity receiving annular groove 31. The chamfer 3111 can be a wedge-shaped surface or an arc surface structure. Along the water flow direction, the wedge-shaped surface or arc surface structure can make the thickness of the front end of the sidewall 311 gradually increase, realizing a smooth transition between the sidewall 311 and the inner wall of the main water passage 1. Impurities in the water flow into the first impurity receiving annular groove 31 under the action of water flow and are collected by the first impurity receiving annular groove 31, without remaining between the sidewall 311 and the inner wall of the main water passage 1. It can be understood that the sealing ring 3 should be replaced in a timely manner as the service time increases.

[0035] Thus, a chamfer 3111 is provided at the end of the side wall 311 of the first impurity receiving annular groove 31 near its outer ring facing the direction of water flow. Impurities in the water flow into the first impurity receiving annular groove 31 under the action of water flow, thereby improving the collection efficiency of impurities in the water.

[0036] Optionally, the plunger 2 includes a positioning groove, which is connected to the sealing ring 3.

[0037] Specifically, the positioning groove is an annular groove that surrounds the plunger 2 axially. The positioning groove engages with the sealing ring 3, and the positioning groove restricts the movement of the corresponding sealing ring 3 in the axial direction of the plunger 2.

[0038] Thus, by connecting the positioning groove to the sealing ring 3, each positioning groove can restrict the axial movement of the corresponding sealing ring 3 in the plunger 2, thereby improving the stability of the sealing ring 3.

[0039] Optionally, combined Figure 1 and Figure 2 As shown, the diversion structure also includes a sealing ring support 4, which is sleeved on the plunger 2 and connected to the end of the sealing ring 3 away from the main water pipe. The sealing ring support 4 is slidably engaged with the inner wall of the main water inlet 11.

[0040] Specifically, the sealing ring support 4 is a ring structure that can be fitted onto the plunger 2. The sealing ring support 4 and the corresponding sealing ring 3 can be simultaneously locked in the same positioning groove on the plunger 2. The sealing ring support 4 and the sealing ring 3 are connected to the end opposite to the main water pipe. The outer wall of the sealing ring support 4 is also movably connected to the main water inlet 11.

[0041] Thus, by fitting the sealing ring support 4 onto the plunger 2 and connecting it to the end of the sealing ring 3 away from the main water pipe, the sealing ring support 4 and the sealing ring 3 can support each other when the plunger 2 moves axially, thereby improving the resistance to deformation. Furthermore, by sliding the sealing ring support 4 against the inner wall of the main water passage 11, the sealing ring support 4 and the sealing ring 3 cooperate with each other to improve the sealing effect.

[0042] Site selection, combined with Figure 1 As shown, the diversion structure also includes a plunger support 5, which is sleeved on the plunger 2. The plunger support 5 is located on the side of the sealing ring 3 away from the main water pipe and is spaced apart from the sealing ring 3. The plunger support 5 slides in cooperation with the inner wall of the main water inlet 11.

[0043] Specifically, the plunger 2 is provided with a mounting groove for mounting the plunger support 5. The plunger support 5 is sleeved on the plunger 2 and engages with the mounting groove. The plunger support 5 is spaced apart from the sealing ring 3, and the plunger support 5 is located on the side of the sealing ring 3 away from the main water pipe, that is, the plunger support 5 is located at the end of the plunger 2 facing the positive Y-axis. When the plunger 2 moves, the plunger support 5 slides against the inner wall of the main water inlet 11.

[0044] Thus, by fitting the plunger support 5 onto the plunger 2, the plunger support 5 can move with the plunger 2. The plunger support 5 is located on the side of the sealing ring 3 away from the main water pipe and is spaced apart from the sealing ring 3. The plunger support 5 slides in cooperation with the inner wall of the main water passage 11. The plunger support 5 and the sealing ring 3 can support the plunger 2, ensuring that the axis of the plunger 2 coincides with the axis of the main water passage 11, so as to ensure the smooth movement of the plunger 2.

[0045] Optionally, the diversion structure also includes a filter structure located at the inlet end of the main water inlet 11 and connected to the diversion block 1, and / or the filter structure located at the outlet end of the main water pipe and connected to the main water pipe.

[0046] Specifically, the filter structure can refer to a structure such as a filter screen that can filter out impurities such as fine sand. When there is one filter structure, it is located at the inlet end of the main water inlet 11 and connected to the diversion block 1, or the filter structure is located at the outlet end of the main water pipe and connected to the main water pipe. When there are two filter structures, one is located at the inlet end of the main water inlet 11 and connected to the diversion block 1, and the other is located at the outlet end of the main water pipe.

[0047] Thus, the filter structure is located at the inlet end of the main water inlet 11 and connected to the diverter block 1, and / or the filter structure is located at the outlet end of the main water pipe and connected to the main water pipe. The filter structure can filter out impurities such as fine sand to ensure that the water entering the main water inlet 11 is clean, thereby cooperating with the sealing ring 3 mentioned above to ensure that impurities such as fine sand do not scratch the plunger 2.

[0048] Another embodiment of this utility model provides a laminar flow cooling device, including a main water pipe and a diversion structure as described above, wherein the main water pipe and the main water inlet 11 of the diversion structure are connected.

[0049] Specifically, the diversion structure is located at one end of the main water pipe, and the main water pipe is connected to the main water inlet 11 of the diversion structure. When the cooling water width does not need to be adjusted, the plunger 2 is located in the front half of the area, and the multiple diversion holes 12 in the front half of the area can be connected to the main water inlet 11. At this time, the cooling water coverage width is the widest. When the cooling water width needs to be adjusted to be narrower, the plunger 2 moves against the current, and the multiple sealing rings 3 gradually block the water flow to the diversion holes 12, thereby blocking the multiple diversion holes 12 in the front half of the area or the multiple diversion holes 12 in the rear half of the area. The specific moving distance of the plunger 2 can be adjusted as needed. When the distance of the plunger 2 moving against the current is the largest, the cooling water coverage width is the smallest. Thus, by using the axial movement of the plunger 2 along the main water inlet 11, the position of the sealing rings 3 on the plunger 2 can be adjusted, that is, the number of diversion holes 12 through which water can flow can be adjusted, thereby satisfying the adjustment of the outlet width. During the water cooling process, the opening of the first impurity receiving ring groove 31 is opposite to the direction of water flow. Under the action of water flow, fine sand in the water can move into the first impurity receiving ring groove 31 and be stored in the first impurity receiving ring groove 31 to avoid fine sand in the water remaining between the plunger 2 and the main water passage 11, which would cause scratches to the plunger 2.

[0050] This laminar flow cooling equipment has all the beneficial effects of this flow splitting structure, which will not be elaborated here.

[0051] Another embodiment of this utility model also provides a hot strip rolling system, including a strip conveying roller table and a laminar flow cooling device as described above. The laminar flow cooling device is located above the strip conveying roller table, and the main water passage in the laminar flow cooling device extends along the width direction of the strip conveying roller table.

[0052] Specifically, the main water pipe of the laminar flow cooling equipment is located above the strip conveyor rollers. The main water pipe extends along the width of the strip conveyor rollers. After the external water supply equipment supplies water to the main water pipe, the movement of the plunger 2 of the laminar flow cooling equipment within the main water passage 11 causes the sealing ring 3 of the laminar flow cooling equipment to disconnect the connection between different numbers of diverters 12 and the main water passage 11, thereby adjusting the width of the cooling water covering the strip conveyor rollers.

[0053] This hot strip rolling system has all the beneficial effects of the laminar flow cooling equipment, which will not be elaborated here.

[0054] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A flow splitting structure, characterized in that, The device includes a diverter block (1), a plunger (2), and a sealing ring (3). The diverter block (1) includes a main water inlet (11) and a plurality of diverter holes (12) communicating with the main water inlet (11). One end of the main water inlet (11) is used to communicate with the main water pipe. The plurality of diverter holes (12) are distributed at intervals along the axial direction of the main water inlet (11). Each diverter hole (12) is used to communicate with the corresponding gooseneck pipe. The plunger (2) extends into the main water inlet (11) from the end of the main water inlet (11) away from the main water pipe and is clearance-fitted with the inner wall of the main water inlet (11). The plunger (2) can move along the axial direction of the main water inlet (11). The sealing ring (3) is sleeved on the plunger (2). The outer peripheral wall of the sealing ring (3) is slidably connected to the inner wall of the main water inlet (11).

2. The shunt structure according to claim 1, characterized in that, The sealing ring (3) is provided with a first impurity receiving ring groove (31) at one end facing the main water pipe, and the opening of the first impurity receiving ring groove (31) faces the main water pipe.

3. The shunt structure according to claim 1, characterized in that, The width of the first impurity-containing ring groove (31) gradually decreases from the groove opening to the bottom of the groove.

4. The shunt structure according to claim 1, characterized in that, The first impurity-containing annular groove (31) includes a sidewall (311) near its outer ring, and the sidewall (311) is provided with a chamfer (3111) at one end facing the direction of water flow.

5. The shunt structure according to claim 1, characterized in that, The plunger (2) includes a positioning groove, which is connected to the sealing ring (3).

6. The shunt structure according to claim 1, characterized in that, It also includes a sealing ring support (4), which is sleeved on the plunger (2) and connected to the end of the sealing ring (3) away from the main water pipe. The sealing ring support (4) slides with the inner wall of the main water inlet (11).

7. The shunt structure according to claim 1, characterized in that, It also includes a plunger support (5), which is sleeved on the plunger (2). The plunger support (5) is located on the side of the sealing ring (3) away from the main water pipe and is spaced apart from the sealing ring (3). The plunger support (5) slides with the inner wall of the main water inlet (11).

8. The shunt structure according to claim 1, characterized in that, It also includes a filter structure located at the inlet end of the main water inlet (11) and connected to the diverter block (1), and / or the filter structure located at the outlet end of the main water pipe and connected to the main water pipe.

9. A laminar flow cooling device, characterized in that, It includes a main water pipe and a diversion structure as described in any one of claims 1-8, wherein the main water pipe and the main water inlet (11) of the diversion structure are connected.

10. A hot-rolling system for strip steel, characterized in that, It includes a strip conveyor roller and a laminar flow cooling device as described in claim 9, wherein the laminar flow cooling device is located above the strip conveyor roller, and the main water passage (11) in the laminar flow cooling device extends along the width direction of the strip conveyor roller.

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