A cooling device for hot-rolled threaded steel rolls and a hot-rolling mill
Patent Information
- Application Number
- CN202522518928.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-27
AI Technical Summary
[0003]为了解决现有技术中冷却效率偏低的问题，本实用新型提供一种热轧螺纹钢轧辊的冷却装置及热轧机，采用输水环对轧辊喷水冷却，能够有效提升冷却效率和冷却效果
1）本实用新型在热轧机机架上固定安装有箱体，箱体内部设有输水环，可向第一轧辊、第二轧辊持续喷水以实现冷却。通过采用环绕第一轧辊、第二轧辊的输水环结构，替代传统离散式喷嘴，能够实现连续、均匀的全周向冷却，显著提高了冷却效果和冷却效率；
Smart Images
Figure CN224808079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to cooling-related equipment in the field of steel rolling, specifically a cooling device for hot-rolled threaded steel rolls and a hot rolling mill. Background Technology
[0002] In the production process of hot-rolled rebar, the rolls must withstand continuous rolling of high-temperature steel billets for extended periods, causing a rapid rise in the temperature of their working surfaces. Insufficient cooling will directly lead to a decrease in the surface hardness of the rolls and accelerated wear, affecting not only the dimensional accuracy and surface quality of the rebar but also potentially causing thermal fatigue cracks in the rolls, significantly shortening their service life. Therefore, implementing efficient and uniform cooling is a crucial step in ensuring rolling stability, improving product quality, and reducing roll wear. Currently, the industry commonly uses spray cooling, which involves installing nozzles on both ends of the rolls for high-pressure water spray cooling. However, existing cooling devices suffer from low cooling efficiency. Utility Model Content
[0003] To address the problem of low cooling efficiency in existing technologies, this invention provides a cooling device and hot rolling mill for hot-rolled threaded steel rolls. The device uses a water-carrying ring to spray water onto the rolls for cooling, which can effectively improve cooling efficiency and cooling effect.
[0004] To achieve the above objectives, the specific solution adopted by this utility model is as follows: a cooling device for hot-rolled threaded steel rolls, comprising a box fixedly installed on a hot rolling mill frame, wherein a steam outlet is provided at the top of the box and a return pipe is connected to the bottom of the box; a first through hole and a second through hole are provided on the box, wherein the non-working area of the first roll of the hot rolling mill passes through the box and is sealed to the inner wall of the first through hole, and the non-working area of the second roll of the hot rolling mill passes through the box and is sealed to the inner wall of the second through hole; and multiple water supply rings for spraying water onto the surfaces of the first roll and the second roll are provided inside the box.
[0005] As an optimized solution for the cooling device of the aforementioned hot-rolled threaded steel roll: the water conveying ring includes multiple first water conveying rings and multiple second water conveying rings, the multiple first water conveying rings are all sleeved on the outside of the first roll and distributed along the axial direction of the first roll; the multiple second water conveying rings are all sleeved on the outside of the second roll and distributed along the axial direction of the second roll.
[0006] As another optimized solution for the cooling device of the hot-rolled threaded steel roll mentioned above: a first water supply pipe and a second water supply pipe are connected to the box body, the first water supply pipe is connected to the first water supply ring; the second water supply pipe is connected to the second water supply ring.
[0007] As another optimized solution for the cooling device of the hot-rolled threaded steel roll mentioned above: the box body is provided with multiple air jet pipes, one end of the air jet pipe extends into the box body, and the other end of the air jet pipe extends out of the box body and is connected to an air source; the part of the air jet pipe extending into the box body is provided with multiple air jet holes that spray air toward the surface of the first roll and the second roll.
[0008] As another optimized solution for the cooling device of the aforementioned hot-rolled threaded steel roll: the water conveying ring is an elastic hollow ring made of rubber.
[0009] As another optimized solution for the cooling device of the hot-rolled threaded steel roll mentioned above: a rubber sealing ring is provided between the outer wall of the first roll and the inner wall of the first perforation; a rubber sealing ring is provided between the outer wall of the second roll and the inner wall of the second perforation.
[0010] To achieve the above objectives, the present invention also adopts a specific solution as follows: a hot rolling mill, including the cooling device for the hot-rolled threaded steel rolls described above.
[0011] As an optimization of the aforementioned hot rolling mill: the areas of the first and second rolls located inside the housing are each provided with multiple annular protrusions distributed along their axial direction.
[0012] As another optimization scheme for the above-mentioned hot rolling mill: the distance between the inner wall of the water conveying ring and the outer wall of the first and second rolls is greater than the distance between the annular protrusion edge and the corresponding outer wall of the first and second rolls.
[0013] As another optimized solution for the above-mentioned hot rolling mill: both the first roll and the second roll include a working area and a non-working area, the diameter of the non-working area is smaller than the diameter of the working area, and the non-working area passes through the housing and is sealed to the housing.
[0014] Compared with the prior art, the present invention has the following beneficial effects: 1) This utility model has a housing fixedly installed on the hot rolling mill stand. The housing is equipped with a water supply ring, which can continuously spray water onto the first roll and the second roll to achieve cooling. By adopting a water supply ring structure surrounding the first roll and the second roll, instead of the traditional discrete nozzles, continuous and uniform circumferential cooling can be achieved, significantly improving the cooling effect and cooling efficiency. 2) Add jet pipes inside the box to form a "water-air combined cooling" mechanism; the jet pipe structure can not only enhance the convective heat transfer effect and accelerate the evaporation of water to absorb heat, but also blow away the residual water film on the surface of the roll in time to avoid steam retention, thereby further improving the overall cooling intensity and operational stability. 3) An annular protrusion structure integrated with the roll is set in the roll cooling area, which increases the heat exchange area and helps to further improve the cooling efficiency. Attached Figure Description
[0015] Figure 1 This is a structural schematic diagram of Example 1. Figure 2 This is a structural schematic diagram of Example 2. Reference numerals: 1. Box body; 101. Rubber sealing ring; 102. Steam outlet; 103. Return pipe; 104. First water supply pipe; 105. Second water supply pipe; 2. First roller; 3. Second roller; 4. Water supply ring; 401. First water supply ring; 402. Second water supply ring; 5. Jet pipe; 6. Annular protrusion; 7. Working area; 8. Non-working area. Detailed Implementation
[0016] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art, such as the structure of the hot rolling mill stand, the installation and driving method of the rolls, the pipeline layout of the conventional spray cooling system, and standard mechanical parts such as bearing seats and seals required to ensure sealing and installation.
[0017] Example 1 Please see Figure 1 A cooling device for hot-rolled threaded steel rolls includes a housing 1 fixedly mounted on a hot rolling mill stand, the housing 1 being welded to the hot rolling mill stand. A steam outlet 102 is provided at the top of the housing 1, through which the heat-exchanged steam rises and exits. A return pipe 103 is connected to the bottom of the housing 1 for collecting and returning cooling water.
[0018] The housing 1 has a first through hole and a second through hole, the diameters of which are larger than the diameters of the non-working areas of the first roll 2 and the second roll 3 of the hot rolling mill. The non-working area of the first roll 2 passes through the housing 1 and is sealed to the inner wall of the first through hole; the non-working area of the second roll 3 passes through the housing 1 and is sealed to the inner wall of the second through hole. In this embodiment, rubber sealing rings 101 are provided between the outer wall of the first roll 2 and the inner wall of the first through hole, and between the outer wall of the second roll 3 and the inner wall of the second through hole. Through this sealing structure design, while ensuring the sealing effect between the housing 1 and the first roll 2 and the second roll 3, the first roll 2 and the second roll 3 can still maintain normal rotation.
[0019] Multiple water-conducting rings 4 are fixedly installed inside the housing 1. Each water-conducting ring 4 is an elastic hollow ring made of rubber. In this embodiment, there are two water-conducting rings 4. Each water-conducting ring 4 is sleeved on the outside of the first roll 2 and the second roll 3 and is distributed along the axial direction of the first roll 2 and the second roll 3. Each water-conducting ring 4 has multiple water spray holes, which spray water evenly and continuously towards the outer surface of the non-working area of the first roll 2 and the non-working area of the second roll 3 for cooling.
[0020] A water supply pipe is installed on the box 1. One end of the water supply pipe extends into the box 1 and is connected to two water supply rings 4. The other end of the water supply pipe is connected to a water source.
[0021] Multiple jet pipes 5 are provided on the housing 1. One end of each jet pipe 5 extends into the housing 1, and the other end extends out of the housing 1 and is connected to an air source. The portion of the jet pipe 5 extending into the housing 1 has multiple jet holes, which uniformly spray air towards the surfaces of the non-working areas of the first roll 2 and the second roll 3. In this embodiment, the number of jet holes is 8 to 30, and the number of jet pipes 5 is two. The two jet pipes 5 are symmetrically arranged on both sides between the non-working areas of the first roll 2 and the second roll 3 to efficiently disperse residual water film and enhance heat exchange.
[0022] Example 2 Please see Figure 2 A cooling device for hot-rolled threaded steel rolls includes a housing 1 fixedly mounted on a hot rolling mill stand, the housing 1 being welded to the hot rolling mill stand. A steam outlet 102 is provided at the top of the housing 1, through which the heat-exchanged steam rises and exits. A return pipe 103 is connected to the bottom of the housing 1 for collecting and returning cooling water.
[0023] The housing 1 has a first through hole and a second through hole, the diameters of which are larger than the diameters of the non-working areas of the first roll 2 and the second roll 3 of the hot rolling mill. The non-working area of the first roll 2 passes through the housing 1 and is sealed to the inner wall of the first through hole; the non-working area of the second roll 3 passes through the housing 1 and is sealed to the inner wall of the second through hole. In this embodiment, rubber sealing rings 101 are provided between the outer wall of the first roll 2 and the inner wall of the first through hole, and between the outer wall of the second roll 3 and the inner wall of the second through hole. Through this sealing structure design, while ensuring the sealing effect between the housing 1 and the first roll 2 and the second roll 3, the first roll 2 and the second roll 3 can still maintain normal rotation.
[0024] Multiple water-carrying rings 4 are fixedly installed inside the housing 1. The water-carrying rings 4 are elastic hollow rings made of rubber. The water-carrying rings 4 include multiple first water-carrying rings 401 and multiple second water-carrying rings 402. In this embodiment, there are two first water-carrying rings 401. Each first water-carrying ring 401 is sleeved on the outside of the first roller 2 and distributed along the axial direction of the first roller 2. The inner sidewall of the first water-carrying ring 401 has a gap with the outer sidewall of the first roller 2. There are also two second water-carrying rings 402. Each second water-carrying ring 402 is sleeved on the outside of the second roller 3 and distributed along the axial direction of the second roller 3. The inner sidewall of the second water-carrying ring 402 has a gap with the outer sidewall of the second roller 3.
[0025] The first water conveying ring 401 has multiple water spray holes that spray water evenly towards the outer surface of the non-working area of the first roll 2; the second water conveying ring 402 has multiple water spray holes that spray water evenly towards the outer surface of the non-working area of the second roll 3. In this embodiment, each water conveying ring 4 has 20 to 50 water spray holes.
[0026] The housing 1 is connected to a first water supply pipe 104 and a second water supply pipe 105. One end of the first water supply pipe 104 extends into the housing 1 and is connected to the first water supply ring 401, and the other end of the first water supply pipe 104 is connected to a water source. One end of the second water supply pipe 105 extends into the housing 1 and is connected to the second water supply ring 402, and the other end of the second water supply pipe 105 is connected to a water source.
[0027] Multiple jet pipes 5 are provided on the housing 1. One end of each jet pipe 5 extends into the housing 1, and the other end extends out of the housing 1 and is connected to an air source. The portion of the jet pipe 5 extending into the housing 1 has multiple jet holes, which uniformly spray air towards the surfaces of the non-working areas of the first roll 2 and the second roll 3. In this embodiment, the number of jet holes is 8 to 30, and the number of jet pipes 5 is two. The two jet pipes 5 are symmetrically arranged on both sides between the non-working areas of the first roll 2 and the second roll 3 to efficiently disperse residual water film and enhance heat exchange.
[0028] Example 3 A hot rolling mill includes the cooling device of embodiment 1 or 2. The first roll 2 and the second roll 3 of the hot rolling mill each include a working area 7 located in the middle and a non-working area 8 located at the end. The diameter of the non-working area 8 is smaller than the diameter of the working area 7 to facilitate the setting of the first water conveying ring 401 and the second water conveying ring 402. The non-working area 8 passes through the housing 1 and is sealed to the housing 1.
[0029] The areas of the first roll 2 and the second roll 3 located inside the housing 1 are each provided with multiple annular protrusions 6 distributed along their axial direction. The distance between the inner wall of the first water supply ring 401 and the outer wall of the first roll 2, and the distance between the inner wall of the second water supply ring 402 and the outer wall of the second roll 3, are greater than the distance between the edge of the annular protrusion 6 and the corresponding outer wall of the first roll 2 and the second roll 3. In this embodiment, the number of annular protrusions 6 provided on the first roll 2 or the second roll 3 is 7. The annular protrusions 6 can significantly increase the contact area with the cooling medium, thereby effectively improving the heat exchange efficiency.
[0030] The working principle of this utility model: During operation, the high-temperature first roll 2 and second roll 3 rotate continuously. Cooling water is pumped into the water supply ring 4 fitted on the first roll 2 and second roll 3 through the first water supply pipe 104 and the second water supply pipe 105, respectively. The cooling water is evenly distributed within the cavity of the water supply ring 4 and continuously and evenly sprayed onto the outer surface of the non-working areas of the first roll 2 and the second roll 3 through densely distributed spray holes on the ring wall, forming a comprehensive cooling water film. This process achieves efficient full-circumferential heat exchange, with a large amount of heat being absorbed and carried away by the cooling water.
[0031] At the same time, compressed air is ejected through the jet holes on the jet pipe 5, forming one or more high-speed airflows. This airflow has multiple functions: First, it directly impacts the surfaces of the first roll 2 and the second roll 3, enhancing the convective heat transfer effect; second, it can quickly break through and remove the residual water film and steam insulation layer formed on the surfaces of the first roll 2 and the second roll 3 due to high temperature, preventing the "Leyton-Frost effect" that causes a decrease in cooling efficiency due to steam retention, and ensuring direct and efficient contact between the cooling water and the surfaces of the first roll 2 and the second roll 3.
[0032] The steam generated by heating is naturally discharged from the steam outlet 102 at the top of the tank 1, while the used cooling water is collected at the bottom of the tank 1 and recycled to the water treatment system through the return pipe 103. After cooling and filtration, it can be recycled, realizing the effective utilization of resources.
[0033] Furthermore, the annular protrusions 6 on the first roll 2 and the second roll 3 significantly increase the actual contact area between the first roll 2 and the second roll 3 and the cooling medium (water and air), further enhancing the heat exchange process. The entire device, through a synergistic "water-air combined cooling" mechanism, ultimately achieves efficient, uniform, and stable strong cooling of the hot-rolled threaded steel rolls.
[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A cooling device for hot-rolled threaded steel rolls, characterized in that: The device includes a housing (1) fixedly installed on the frame of a hot rolling mill. The top of the housing (1) has a steam outlet (102), and the bottom of the housing (1) is connected to a return pipe (103). The housing (1) has a first perforation and a second perforation. The non-working area of the first roll (2) of the hot rolling mill passes through the housing (1) and is sealed to the inner wall of the first perforation. The non-working area of the second roll (3) of the hot rolling mill passes through the housing (1) and is sealed to the inner wall of the second perforation. The housing (1) is provided with multiple water supply rings (4) that spray water onto the surfaces of the first roll (2) and the second roll (3).
2. The cooling device for hot-rolled threaded steel rolls as described in claim 1, characterized in that: The water conveying ring (4) includes a plurality of first water conveying rings (401) and a plurality of second water conveying rings (402). The plurality of first water conveying rings (401) are all sleeved on the outside of the first roll (2) and distributed along the axial direction of the first roll (2); the plurality of second water conveying rings (402) are all sleeved on the outside of the second roll (3) and distributed along the axial direction of the second roll (3).
3. The cooling device for hot-rolled threaded steel rolls as described in claim 2, characterized in that: The housing (1) is connected to a first water supply pipe (104) and a second water supply pipe (105). The first water supply pipe (104) is connected to a first water supply ring (401); the second water supply pipe (105) is connected to a second water supply ring (402).
4. The cooling device for hot-rolled threaded steel rolls as described in claim 1, characterized in that: The box (1) is provided with multiple jet pipes (5). One end of the jet pipe (5) extends into the box (1), and the other end of the jet pipe (5) extends out of the box (1) and is connected to an air source. The part of the jet pipe (5) that extends into the box (1) has multiple jet holes that spray air toward the surface of the first roll (2) and the second roll (3).
5. The cooling device for hot-rolled threaded steel rolls as described in claim 1, characterized in that: The water conveying ring (4) is an elastic hollow ring made of rubber.
6. The cooling device for hot-rolled threaded steel rolls as described in claim 1, characterized in that: A rubber sealing ring (101) is provided between the outer wall of the first roll (2) and the inner wall of the first perforation; a rubber sealing ring (101) is provided between the outer wall of the second roll (3) and the inner wall of the second perforation.
7. A hot rolling mill, characterized in that: The cooling device includes the hot-rolled threaded steel rolls as described in any one of claims 1-6.
8. A hot rolling mill as described in claim 7, characterized in that: The first roll (2) and the second roll (3) are provided with multiple annular protrusions (6) distributed along their axial direction in the area inside the box (1).
9. A hot rolling mill as described in claim 8, characterized in that: The distance between the inner wall of the water conveying ring (4) and the outer walls of the first roll (2) and the second roll (3) is greater than the distance between the edge of the annular protrusion (6) and the corresponding outer walls of the first roll (2) and the second roll (3).
10. A hot rolling mill as described in claim 7, characterized in that: The first roll (2) and the second roll (3) both include a working area (7) and a non-working area (8). The diameter of the non-working area (8) is smaller than the diameter of the working area (7). The non-working area (8) passes through the housing (1) and is sealed to the housing (1).