Rolled steel cooling nozzle

Abstract

The utility model discloses a rolled steel cooling nozzle, which relates to the technical field of industrial nozzles and comprises an inlet pipe, an inlet pipe positioning sleeve, a spacer sleeve, a middle pipe, a lining pipe and an outlet pipe which are coaxially arranged, the inlet pipe, the lining pipe and the outlet pipe are sequentially arranged along a rolled steel conveying path, and the middle pipe is sleeved on the lining pipe and the outlet pipe. The spacer sleeve is arranged at the other end of the middle pipe, the inlet pipe and the spacer sleeve are sleeved with the inlet pipe positioning sleeve, one end of the inlet pipe is inserted into the spacer sleeve, a conical ring water outlet gap is formed between the end of the inlet pipe and the spacer sleeve, the conical ring water outlet gap is communicated with a water inlet of the inlet pipe positioning sleeve, and an axial channel of the lining pipe is a Venturi channel. The venturi channel is provided with at least two venturi cavities which are connected in series, and the pipe wall of the lining pipe is not provided with through holes. The steel rolling cooling nozzle solves the problem that an existing steel rolling cooling nozzle is low in cooling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of industrial nozzle technology, and in particular to a steel rolling cooling nozzle. Background Technology

[0002] An existing dual-high-speed bar production line is equipped with 24 rolling mill stands. Mills 1 through 18 are short-stress mills, while mills 19 through 24 are cantilevered ring mills. To maximize the reduction of the billet's alloy composition while simultaneously achieving the rolling of high-performance steel from low-alloy billets, this production line combines pre-rolling two-phase zone rolling technology with post-rolling temperature control technology. In the low-temperature rolling process, the workpiece needs to be significantly cooled before rolling, which places high demands on the cooling capacity of the cooling water tank.

[0003] Currently, this dual high-speed bar production line is equipped with cooling water tanks #1 to #6, specifically for cooling the rolled pieces. Specifically, cooling water tank #1 is located between mills #18 and #19 to control the temperature of the rolled pieces before they enter the finishing mill; cooling water tanks #2 and #3 are located between mills #22 and #23 to control the temperature of the rolled pieces before they enter the reduction mill; and cooling water tanks #4, #5, and #6 are located after mill #24 to control the temperature of the finished product before it reaches the cooling bed.

[0004] Because the rolling speed of dual high-speed bars is extremely high, the final rolling speed of the finished product can reach over 36 m / s, while the exit speed of the No. 18 rolling mill is between 10.5 and 11.5 m / s. Initially, the No. 1 water tank could only accommodate six cooling nozzles. However, during low-temperature production, the rolled stock needs to be cooled from approximately 1050°C to around 900°C. Figure 1 As shown, the original type of cooling nozzle currently in use has a porous, flat internal cavity. Cooling water flows out from the gaps and is sprayed onto the rolled piece for cooling. This type of cooling nozzle has the following shortcomings: the cooling water lacks turbulence during its outflow, resulting in insufficient heat exchange efficiency. Therefore, although cooling water is sprayed onto the rolled piece, its cooling capacity cannot meet the process requirements, causing the temperature reduction of the rolled piece to fail to reach the predetermined process standards. In short, the original type of cooling nozzle has low cooling efficiency and cannot meet the low-temperature rolling requirements of the current production line. Utility Model Content

[0005] The purpose of this invention is to provide a steel rolling cooling nozzle that can solve the problem of low cooling efficiency in existing steel rolling cooling nozzles.

[0006] In order to solve the above problems, the utility model adopts the technical scheme: this kind of steel rolling cooling nozzle includes coaxial setting import pipe, import pipe positioning sleeve, baffle, intermediate pipe, inner lining pipe and export pipe, the import pipe, the inner lining pipe and the export pipe are sequentially arranged along the steel rolling conveying path, the intermediate pipe is sleeved on the inner lining pipe and the export pipe, the baffle is arranged at the other end of the intermediate pipe, the import pipe positioning sleeve is sleeved on the import pipe and the baffle, one end of the import pipe is inserted into the baffle and forms the conical ring water gap between the baffle, the conical ring water gap is communicated with the water inlet of the import pipe positioning sleeve, the axial passage of the inner lining pipe is the venturi passage, the venturi passage has at least two venturi cavities in series, and the pipe wall of the inner lining pipe has no through hole.

[0007] In the technical scheme of the above steel rolling cooling nozzle, a more specific technical scheme can also be that a plurality of through holes are formed in the pipe wall of the import pipe and communicated with the water inlet.

[0008] In some possible embodiments, the through holes are located on one side of the water inlet and have the same orientation as the water inlet.

[0009] In some possible embodiments, an adjusting gasket for adjusting the conical ring water gap is arranged between the baffle and the import pipe positioning sleeve.

[0010] In some possible embodiments, the intermediate pipe includes an intermediate pipe body and a baffle positioning seat and a mounting clamping seat clamped with the export pipe, which are respectively welded and fixed at both ends of the intermediate pipe body.

[0011] In some possible embodiments, the import pipe positioning sleeve is provided with a mounting step buckled on the water tank body on one side of the water inlet.

[0012] In some possible embodiments, there are two inner lining pipes, and each inner lining pipe is provided with one venturi cavity.

[0013] In some possible embodiments, the venturi cavity is composed of a converging section, a throat section and a diverging section, and the converging section and the diverging section are symmetrically arranged at both ends of the throat section.

[0014] In some possible embodiments, the inner lining pipe is abuttingly fixed with the baffle and the export pipe respectively.

[0015] In some possible embodiments, the inner wall of the intermediate pipe is gap-fitted with the outer wall of the inner lining pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects due to the adoption of the above technical scheme:

[0017] 1. The nozzle has a Venturi channel inside, and the Venturi channel has at least two Venturi cavities, that is, at least two water storage turbulent flow areas. The turbulent effect greatly enhances the heat exchange efficiency between the cooling water and the rolled piece, significantly improves the cooling capacity; the inner lining tube wall has no through hole, which can not only avoid weakening the turbulent effect and ensure uniform cooling of the rolled steel, but also prevent the through hole from being blocked by impurities such as iron slag during the flow process, thereby reducing the difficulty and frequency of nozzle maintenance.

[0018] 2. The through hole on the inlet pipe wall can preliminarily cool a part of the cooling water to the rolled steel, ensuring that the cooling water has effectively absorbed the heat from the rolled steel before entering the turbulent area, thereby improving the overall cooling efficiency. These through holes are far away from the turbulent area and are not easy to be blocked by impurities generated during the cooling process. Through the synergistic effect of the through hole on the inlet pipe wall and the water outlet gap of the conical ring, the cooling water can more evenly cover the surface of the rolled steel, which helps to reduce the temperature gradient during the cooling process and improve the cooling uniformity of the rolled steel, thereby reducing the risk of deformation and cracks caused by thermal stress; the through hole is relatively located on the outside, so it is easy to clean even if it is blocked.

[0019] 3. The through hole of the inlet pipe and the water inlet are in the same direction, so that the cooling water can flow more smoothly into the inside of the inlet pipe, reducing the resistance generated when the water flow turns or changes direction, and directly impacting the surface of the rolled steel for direct cooling, thereby improving the cooling speed. In addition, impurities in the cooling water are not easy to accumulate at the through hole, reducing the risk of blockage.

[0020] 4. The adjusting gasket is provided, and the size of the gap can be adjusted by increasing or reducing the gasket, so as to change the size of the water outlet gap, thereby reasonably cooling the rod of different sizes and improving the universality and applicability of the nozzle.

[0021] 5. The components of the nozzle are fixed by clamping and welding, and are connected by axial bolts, which is convenient for quick positioning and installation, and also improves the connection strength.

[0022] 6. Two inner lining tubes are provided, each inner lining tube has a Venturi cavity, and the structure design of the Venturi cavity can simplify the processing difficulty and reduce the production cost.

[0023] 7. The inner lining tube is fixed by abutting, without the need for connecting parts or fasteners, which simplifies the installation process and reduces the installation cost. This connection method is also convenient for disassembly and maintenance.

[0024] 8. The gap between the inner lining tube and the intermediate tube can better disperse and withstand the pressure and vibration from the inner lining tube and the fluid inside, ensuring stable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1is a structural schematic diagram of an existing steel rolling cooling nozzle.

[0026] Figure 2 is a structural schematic diagram of a steel rolling cooling nozzle.

[0027] The figure mark explanation: 1, import pipe; 1-1, through hole; 2, import pipe positioning sleeve; 2-1, water inlet; 2-2, cooling water cavity; 2-3, installation step; 3, adjusting gasket; 4, baffle sleeve; 5, intermediate pipe; 5-1, baffle sleeve positioning seat; 5-2, intermediate pipe main body; 5-3, installation clamping seat; 6, export pipe; 7, inner lining pipe; 7-1, contraction section; 7-2, throat section; 7-3, expansion section; 8, conical ring water gap. DETAILED DESCRIPTION

[0028] The utility model will be further described in detail below in combination with the embodiment of the accompanying drawings:

[0029] Figure 2 The steel rolling cooling nozzle shown, mainly includes import pipe 1, import pipe positioning sleeve 2, baffle sleeve 4, intermediate pipe 5, inner lining pipe 7 and export pipe 6, these components are coaxial arrangement, jointly constitutes the main body structure of cooling nozzle. Among them, import pipe 1, inner lining pipe 7 and export pipe 6 are sequentially arranged along the conveying path of steel rolling, they not only serve as the guide channel of steel rolling, but also undertake the conveying task of cooling water;The conical tail end of import pipe 1 is inserted into baffle sleeve 4, and the conical ring water gap 8 is formed between import pipe 1 and baffle sleeve 4, and the water inlet 2-1 of import pipe positioning sleeve 2 is communicated with the conical ring water gap 8. Inner lining pipe 7 is arranged inside intermediate pipe 5, and the axial channel thereof is designed as a Venturi channel, having at least two Venturi cavities in series. Intermediate pipe 5 is sleeved on inner lining pipe 7 and export pipe 6, it is worth mentioning that intermediate pipe 5 and inner lining pipe 7 are not fixed by connecting pieces or locking pieces, inner lining pipe 7 is directly abutted and fixed with baffle sleeve 4 and export pipe 6 respectively, and the inner wall of intermediate pipe 5 and the outer wall of inner lining pipe 7 are gap-fitted. Except inner lining pipe 7, other components are mainly positioned and fixed by clamping structure and bolt, so as to facilitate quick positioning and disassembly. In addition, import pipe positioning sleeve 2 is provided with installation step 2-2 on the side of water inlet 2-1, which is buckled on the tank body, facilitating the installation and fixation of the nozzle.

[0030] The structure of the internal passage of the inlet pipe 1 and the outlet pipe 6 is substantially the same, both having a tapered guide section for quickly guiding the rolled steel and a cylindrical limiting section for limiting the transmission path of the rolled steel, so as to ensure the smooth transmission of the rolled steel and the efficient use of the cooling water. The inlet pipe positioning sleeve 2 is internally designed with a cooling water cavity 2-2, and a water inlet 2-1 is formed in the side wall of the cooling water cavity 2-2 and communicates with the cooling water cavity 2-2. The cooling water flows into the cooling water cavity 2-2 through the water inlet 2-1 and is then sprayed out of the tapered ring water outlet gap 8. In some possible embodiments, a plurality of through holes 1-1 are formed in the side wall of the cylindrical limiting section of the inlet pipe 1, and the cooling water cavity 2-2 in the inlet pipe positioning sleeve 2 communicates with the rolled steel passage in the inlet pipe 1 through the through holes 1-1, so that a part of the cooling water can preliminarily cool the rolled steel, further improving the cooling efficiency. Preferably, the through holes 1-1 are located on one side of the water inlet 2-1 and have the same orientation as the water inlet 2-1.

[0031] In some possible embodiments, an adjusting gasket 3 is arranged between the baffle sleeve 4 and the inlet pipe positioning sleeve 2 to adjust the size of the tapered ring water outlet gap 8. By increasing or reducing the gasket, the size of the tapered ring water outlet gap 8 can be flexibly adjusted to adapt to the cooling needs of rod materials of different sizes.

[0032] In some possible embodiments, the inner lining pipe 7 has two, and one end of each of the two inner lining pipes 7 abuts against each other, and the other end abuts against the baffle sleeve 4 and the outlet pipe 6, respectively. The outer wall of the inner lining pipe 7 and the inner wall of the intermediate pipe 5 are in clearance fit.

[0033] In some possible embodiments, the intermediate pipe 5 serves as a support and protection layer, and includes a baffle positioning seat 5-1, an intermediate pipe main body 5-2 and a mounting clamping seat 5-3. The baffle positioning seat 5-1 and the mounting clamping seat 5-3 are respectively welded and fixed to the two ends of the intermediate pipe main body 5-2, and the outlet pipe 6 is clamped and fixed to the mounting clamping seat 5-3.

[0034] In operation, the rolled steel enters the nozzle from the large end of the tapered guide section of the inlet pipe 1, while the cooling water enters the nozzle from the water inlet 2-1 of the inlet pipe positioning sleeve 2, a part of the cooling water directly impacts the surface of the rolled steel in the inlet pipe 1 through the multiple through holes 1-1 on the wall of the inlet pipe 1 to preliminarily cool the rolled steel, and the other part of the cooling water is sprayed from the tapered ring water outlet gap 8 to form a ring-shaped water outlet for further cooling the rolled steel. The rolled steel that has been preliminarily cooled and ring-shaped water-sprayed enters the Venturi channel of the inner lining pipe 7, and during the flow of the cooling water through the Venturi channel, especially in the two water storage turbulent areas formed by the expansion section and the contraction section of the two inner lining pipes 7 and the expansion section of the inner lining pipe 7 and the tapered guide section of the outlet pipe 6, the cooling water produces a strong turbulent effect, which greatly improves the heat exchange efficiency between the cooling water and the rolled steel. Finally, the rolled steel is output from the outlet pipe 6, and the cooling water is also discharged from the nozzle through the outlet pipe 6.

[0035] The cooling water travels along the same direction as the rolled steel in the nozzle, and the rolled steel is uniformly cooled by the cooling water when passing through the nozzle, which is beneficial to break the protective gas film on the surface of the rolled steel and does not produce additional resistance, ensuring stable production of the rolled steel.

[0036] The rolled steel cooling nozzle optimizes the internal structure to achieve cooling water turbulence and water storage, improve heat exchange efficiency, significantly enhance cooling capacity, and has good cooling uniformity, low maintenance difficulty, and low production cost, which can meet the requirements of low-temperature rolling under high-speed production and stabilize the control of the rolled steel production process. When used in the rolled steel cooling process of two high-bar production lines in the applicant's hot rolling plant, the cooling efficiency is improved by about 30% compared with the original cooling nozzle.

Claims

1. A steel rolling cooling nozzle comprising an inlet pipe, an inlet pipe positioning sleeve, a baffle sleeve, an intermediate pipe, an inner lining pipe and an outlet pipe, the inlet pipe, the inner lining pipe and the outlet pipe are arranged in sequence along a steel rolling conveying path, the intermediate pipe is sleeved on the inner lining pipe and the outlet pipe, the baffle sleeve is arranged at the other end of the intermediate pipe, the inlet pipe positioning sleeve is sleeved on the inlet pipe and the baffle sleeve, one end of the inlet pipe is inserted into the baffle sleeve and a tapered ring water outlet gap is formed between the inlet pipe and the baffle sleeve, the tapered ring water outlet gap is communicated with a water inlet of the inlet pipe positioning sleeve, characterized in that: The axial channel of the inner lining pipe is a Venturi channel having at least two Venturi cavities in series, and the pipe wall of the inner lining pipe has no through hole.

2. A steel rolling cooling nozzle according to claim 1, characterized in that: A plurality of through holes are formed in the pipe wall of the inlet pipe and communicate with the water inlet.

3. A steel rolling cooling nozzle according to claim 2, characterized in that: The through holes are located on one side of the water inlet and have the same orientation as the water inlet.

4. A steel rolling cooling nozzle according to claim 3, characterized in that: An adjusting gasket for adjusting the water outlet gap of the conical ring is arranged between the baffle sleeve and the inlet pipe positioning sleeve.

5. A steel rolling cooling nozzle according to any one of claims 1 to 4, characterized in that: The intermediate pipe comprises an intermediate pipe body and a baffle sleeve positioning seat and an installation clamping seat clamped with the outlet pipe, which are respectively welded and fixed at two ends of the intermediate pipe body.

6. A steel rolling cooling nozzle according to claim 1, characterized in that: The inlet pipe positioning sleeve is provided with an installation step buckled on the water tank body on one side of the water inlet.

7. A steel rolling cooling nozzle according to claim 1, characterized in that: Two inner lining pipes are provided, and each inner lining pipe is provided with one Venturi cavity.

8. A steel rolling cooling nozzle according to claim 7, characterized in that: The Venturi cavity is composed of a converging section, a throat section and a diverging section, and the converging section and the diverging section are symmetrically arranged at two ends of the throat section.

9. A steel rolling cooling nozzle according to claim 7, characterized in that: The inner lining pipe is abutted and fixed with the baffle sleeve and the outlet pipe respectively.

10. A steel rolling cooling nozzle according to claim 9, characterized in that: The inner wall of the intermediate pipe is gap-fitted with the outer wall of the inner lining pipe.

Images