Apparatus and method for implementing online immersion cooling of inner wall and outer wall of steel tube after rolling

Abstract

The present invention provides an apparatus and method for implementing online immersion cooling of an inner wall and an outer wall of a steel tube after rolling. The apparatus comprises: an immersion tank, comprising a bottom plate, and two end plates and two side plates located on the bottom plate, wherein an overflow port is formed at each of a first end plate and a second end plate; a roller conveying mechanism, arranged along the longitudinal axis of the immersion tank and running through the immersion tank, wherein the roller conveying mechanism comprises a plurality of parallel rollers, two ends of each roller respectively penetrate through the two side plates, and the roller conveying mechanism is configured to drive a steel tube to enter the immersion tank through the overflow port on the first end plate and exit the immersion tank through the overflow port on the second end plate; and a water injection system, configured to inject cooling water into the immersion tank and adjust the liquid level height in the immersion tank, wherein when the liquid level height in the immersion tank is higher than the height of the steel tube, the cooling water in the immersion tank overflows from the overflow ports. The present invention solves the problem of failing to simultaneously cool an outer wall and an inner wall during online cooling of a steel tube, thereby significantly reducing apparatus costs and operating costs.

Description

Device and method for realizing liquid immersion cooling of inner wall and outer wall of steel pipe after rolling in line TECHNICAL FIELD

[0001] The present application relates to the technical field of hot-rolled seamless steel pipe production, in particular to a device and method for realizing liquid immersion cooling of inner wall and outer wall of steel pipe after rolling in line. BACKGROUND

[0002] Realizing liquid immersion cooling of inner wall and outer wall of steel pipe after rolling in line refers to realizing simultaneous liquid immersion cooling of outer wall and inner wall of steel pipe under the condition that the steel pipe moves at high speed on a roller. The cooling method realizes cooling of the inner wall of the steel pipe by the way of liquid immersion, which is different from the current commonly used way of cooling the inner wall of the steel pipe by water spraying.

[0003] Due to the characteristics of large length and fast movement speed of online cooling of hot-rolled seamless steel pipe, the current online cooling of steel pipe generally adopts the way of spraying water on the outer wall to realize cooling. Compared with the way of bidirectional heat transfer of inner wall and outer wall, the cooling capacity of the cooling way of unidirectional heat transfer of outer wall is low.

[0004] Chinese patent application with publication number CN106269932A discloses a hot-rolled seamless steel pipe online control cooling device. In the patent scheme, a plurality of cooling spray rings are arranged between the rollers in the cooling zone and are uniformly arranged along the roller conveying direction. The water pressure of the cooling spray ring is adjusted in the range of 0.2-0.8 MPa, and the water flow is adjusted in the range of 30-120 m 3 / h. The patent adopts the structure of spray ring to realize cooling of the outer wall of the steel pipe by spraying high-pressure water around the steel pipe. The low cooling capacity caused by the unidirectional cooling of the outer wall limits the thickness and material range of the steel pipe. In addition, in order to make up for the limitation of the number of spray ring groups, high-pressure water is needed to improve the cooling strength, which makes the equipment cost and operation cost high. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a device and method for realizing liquid immersion cooling of inner wall and outer wall of steel pipe after rolling in line.

[0006] According to one aspect of the present application, a device for realizing liquid immersion cooling of inner wall and outer wall of steel pipe after rolling in line is provided, comprising:

[0007] a liquid immersion tank comprising a bottom plate and two end plates and two side plates located on the bottom plate, wherein the first end plate and the second end plate are each provided with an overflow port;

[0008] a roller conveyor mechanism arranged along the longitudinal axis of the tank and penetrating through the tank, the roller conveyor mechanism comprising a plurality of parallel rollers, both ends of the rollers penetrating through the two side plates respectively; the roller conveyor mechanism is used to drive the steel pipe to enter the tank from the overflow port on the first end plate and to exit the tank from the overflow port on the second end plate;

[0009] a water injection system used to inject cooling water into the tank and to adjust the liquid level in the tank, when the liquid level in the tank is higher than the height of the steel pipe, the cooling water in the tank overflows from the overflow port.

[0010] Optionally, the overflow port is a hole structure.

[0011] Optionally, the hole structure is a circular hole with a diameter larger than that of the steel pipe.

[0012] Optionally, the overflow port is a gap opened from the top end of the end plate.

[0013] Optionally, the size of the gap is determined according to the diameter and deformation of the steel pipe.

[0014] Optionally, the roller is a V-shaped roller, and the axis of the roller is arranged perpendicularly to the running axis of the steel pipe.

[0015] Optionally, the roller is a V-shaped roller, and the axis of the roller is arranged at an angle to the running axis of the steel pipe.

[0016] Optionally, the water injection system comprises a water injection pipeline and a water injection power mechanism connected to the water injection pipeline, the water injection pipeline penetrating through one of the side plates, and the water injection power mechanism being used to adjust the sum of the water injection rates into the tank.

[0017] Optionally, the water injection rate of the water injection power mechanism into the tank is greater than the overflow rates of the overflow ports on the two end plates.

[0018] According to another aspect of the present application, a method for realizing the immersion cooling of the inner wall and the outer wall of a steel pipe after rolling is provided, which is realized by using the above-mentioned device, and the method comprises:

[0019] The liquid level in the tank is adjusted by the water injection system, when the liquid level in the tank is higher than the height of the steel pipe, the head of the steel pipe enters the tank from the overflow port on the first end plate; as the steel pipe moves into the tank, the outer wall of the steel pipe extending into the first end plate is cooled, the inner wall is filled with cooling water and the cooling water flows in the opposite direction of the movement of the steel pipe, so as to realize the simultaneous cooling of the inner wall and the outer wall of the steel pipe.

[0020] When the steel pipe is completely in the tank, the outer wall and the inner wall of the steel pipe are cooled in the immersion state.

[0021] When the head of the steel pipe exposes from the second end plate, the outer wall of the steel pipe contacts with air and enters into air cooling state, and the cooling water is injected from the tail of the steel pipe and flows out from the head of the steel pipe, so as to realize immersion cooling of the inner wall of the steel pipe;

[0022] When the tail of the steel pipe leaves the second end plate, the immersion cooling process of the steel pipe is ended.

[0023] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0024] In the present application, the overflow openings are arranged on the end plates at both ends of the immersion tank, the liquid level in the immersion tank is controlled to be higher than the height of the steel pipe by the water injection system, and the outer wall and the inner wall of the steel pipe can be cooled at the same time during the whole process that the steel pipe enters into the immersion tank from the overflow opening at one end and then leaves from the overflow opening at the other end, so that the problem that the outer wall and the inner wall of the steel pipe cannot be cooled at the same time in the online cooling is solved. Compared with the cooling mode of spraying water on the outer wall in the prior art, the present application realizes high strength and uniform cooling of the steel pipe in the immersion state, and in addition, the equipment cost and operation cost can be significantly reduced because high-pressure water is not needed to be provided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings:

[0026] Fig. 1 is a structural schematic view of the equipment for realizing immersion cooling of the inner wall and the outer wall of the steel pipe after rolling in an embodiment of the present application;

[0027] Fig. 2 is a top view of the equipment for realizing immersion cooling of the inner wall and the outer wall of the steel pipe after rolling in an embodiment of the present application;

[0028] Fig. 3 is a side sectional view of the equipment for realizing immersion cooling of the inner wall and the outer wall of the steel pipe after rolling in an embodiment of the present application;

[0029] Fig. 4 is a sectional view of the equipment for realizing immersion cooling of the inner wall and the outer wall of the steel pipe after rolling in an embodiment of the present application along the motion axis of the steel pipe;

[0030] Corresponding to the reference signs: 1 is a roller bed, 2 is a steel pipe, 3 is an immersion tank, 31 is a first end plate, 31' is a second end plate, 32 is a first side plate, 32' is a second side plate, 33 is a bottom plate, 4 is a water injection pipeline, a indicates overflow of the first end plate, b indicates overflow of the second end plate, c indicates water outlet of the inner hole of the head of the steel pipe, and d indicates liquid level in the immersion tank. DETAILED DESCRIPTION

[0031] The application will be described in greater detail in connection with specific embodiments. The following examples will help those skilled in the art further understand the application, but do not limit the application in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the application. These are within the scope of the application.

[0032] It should be noted that the terms "first", "second", and the like are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. Moreover, the terms "first", "second", and the like are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0033] In order to solve the problem that the online cooling in the prior art can only cool the outer wall, but it is difficult to cool the inner wall at the same time, an embodiment of the application provides a device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling. Referring to FIGS. 1-4, the device comprises a liquid immersion tank 3, a roller conveying mechanism, and a water injection system, wherein: the liquid immersion tank 3 comprises a bottom plate 33 and two end plates and two side plates arranged on the bottom plate 33, wherein the two end plates are respectively arranged at two ends of the liquid immersion tank 3, and the first end plate 31 and the second end plate 31' are each provided with an overflow port; the roller conveying mechanism is arranged along the longitudinal axis of the liquid immersion tank 3 and penetrates through the liquid immersion tank 3, and the roller conveying mechanism comprises a plurality of parallel rollers 1, two side plates (including a first side plate 32 and a second side plate 32') are arranged on both sides of the roller 1, and both ends of the roller 1 respectively pass out of the two side plates; the cooling water overflows from the overflow port, facilitating the passage of the steel pipe, and the roller conveying mechanism is used to drive the steel pipe 2 to enter the liquid immersion tank 3 from the overflow port on the first end plate 31 and to leave the liquid immersion tank 3 from the overflow port on the second end plate 31'; the water injection system is used to inject cooling water into the liquid immersion tank 3 and adjust the liquid level in the liquid immersion tank 3, when the liquid level in the liquid immersion tank 3 is higher than the height of the steel pipe, the cooling water in the liquid immersion tank 3 overflows from the overflow port, realizing the simultaneous cooling of the inner wall and the outer wall of the steel pipe.

[0034] In the embodiment of the present application, the overflow port is formed on the end plate, and the steel pipe 2 can pass through the overflow port. In order to cover the steel pipe with liquid, the height of the overflow port is higher than the height of the steel pipe. When the water injection rate of the water injection system to the immersion tank 3 exceeds the overflow rate of the overflow ports of the two end plates, the water level in the immersion tank 3 will rise. When the height of the liquid level d in the immersion tank is higher than the highest point of the steel pipe 2 moving on the roller conveying mechanism, the steel pipe 2 enters from the overflow port of the end plate at one end of the immersion tank 3 under the drive of the roller conveying mechanism. The higher the height of the liquid level in the immersion tank is higher than the steel pipe, the better the cooling effect is. During the entering process, the outer wall of the steel pipe 2 is immediately covered by the water overflowing from the overflow port of the first end plate 31 to the outside, and the inner wall of the steel pipe 2 is immediately filled with the water overflowing from the overflow port of the first end plate 31 to the outside, so that the outer wall and the inner wall of the steel pipe 2 are cooled at the same time. With the movement of the roller conveying mechanism, the steel pipe 2 enters the immersion tank 3 completely. Since the height of the liquid level d in the immersion tank is higher than the height of the steel pipe 2, that is, the steel pipe 2 is below the liquid level, the outer wall and the inner wall of the steel pipe 2 are cooled in the immersion state. The roller conveying mechanism continues to drive the steel pipe 2 to move away from the overflow port of the second end plate 31' of the immersion tank, and the outer wall of the steel pipe 2 is covered by the overflow b of the second end plate, while the water flow in the inner hole of the steel pipe 2 flows out from the head of the steel pipe 2, and the direction of the water flow is the same as the direction of the movement of the steel pipe 2. Thus, during the whole process of the steel pipe 2 from entering to leaving the immersion tank 3, the outer wall and the inner wall of the steel pipe 2 are cooled at the same time.

[0035] In some embodiments, the overflow port is a hole structure. The hole structure can reduce the amount of water overflowing from the overflow port, so that the liquid level is maintained at a certain height. In theory, the smaller the size of the hole structure, the better. However, the influence of the swing and deformation of the steel pipe during passing through is considered. Exemplarily, the hole structure is a circular hole larger than the diameter of the steel pipe 2.

[0036] In some embodiments, the overflow port is a gap formed from the top end of the end plate. Forming a gap on the end plate is more convenient for hoisting the steel pipe out directly when a fault occurs during the operation of the steel pipe. The size of the gap is determined according to the diameter of the steel pipe 2 and the deformation amount. Exemplarily, for a steel pipe with a length of 30 m, if the deformation along the axis is 1 mm per meter, the deformation of the steel pipe along the axis is 30 mm. If the deformation of the steel pipe is too large, the steel pipe can not run smoothly along the roller, and can be stuck, and the steel pipe can be hoisted out conveniently through the gap.

[0037] The roller conveying mechanism in the embodiment of the present application runs through the whole process of the immersion cooling of the steel pipe 2 from the roller after the rolling is completed to the starting roller of the cooling bed. In order to meet the requirement of the straight-line movement of the steel pipe 2, in some embodiments, the roller 1 adopts a V-shaped roller, and the axis of the roller 1 is arranged perpendicularly to the running axis of the steel pipe 2. During the transmission, the steel pipe is located at the position where the diameter of the steel pipe is tangent to the V-shaped roller.

[0038] To improve the cooling efficiency, the steel pipe 2 performs a rotating motion while performing a linear motion. To meet the requirements of the linear and rotating motions of the steel pipe 2, in some embodiments, the roller way 1 is a V-shaped roller way, the axis of the roller way 1 is arranged at a certain angle with the running axis of the steel pipe 2, and the steel pipe 2 performs a rotating motion while performing a linear motion along the axis. The greater the angle, the greater the rotating speed.

[0039] In some embodiments, the water injection system comprises a water injection pipeline 4 and a water injection power mechanism connected with the water injection pipeline 4. The water injection pipeline 4 penetrates one of the side plates, and the water injection power mechanism is used to adjust the rate of water injection into the immersion tank 3.

[0040] Exemplarily, the water injection power mechanism can be a pump or an electric valve provided with a high-position water tank. In other embodiments, other types of water injection power mechanisms can also be used, which are not specifically limited in the embodiments of the present application.

[0041] To realize the simultaneous immersion liquid cooling of the inner wall and the outer wall of the steel pipe 2 during the whole process from entering to leaving the immersion tank 3, it is necessary to continuously inject cooling water into the immersion tank 3. In some embodiments, the rate of water injection into the immersion tank 3 by the water injection power mechanism is greater than the sum of the overflow rates of the overflow ports on the two end plates, so as to ensure that the liquid level in the immersion tank 3 is higher than the height of the steel pipe during the cooling process.

[0042] The working process of the equipment in the above embodiments of the present application is as follows:

[0043] The end of the high-temperature steel pipe 2 after rolling first enters the immersion tank 3 from the first end plate 31 of the immersion tank 3. When the height of the liquid level d in the immersion tank 3 is higher than the highest point of the steel pipe 2 moving on the roller transmission mechanism, the outer wall and the inner hole of the steel pipe 2 are covered and filled with water, i.e. the first end plate overflow a, overflowing from the end plate. With the movement of the steel pipe 2 into the immersion tank 3, the outer wall of the steel pipe 2 immersed in the water realizes immersion liquid cooling, and the inner wall of the steel pipe 2 will be gradually filled with water and the water flows in the opposite direction of the movement of the steel pipe 2 until it flows out at the other end of the steel pipe 2, realizing immersion liquid cooling of the inner wall of the steel pipe 2; when the steel pipe 2 enters the immersion tank 3 completely, the outer wall and the inner wall of the steel pipe 2 are cooled in the immersion state; when the head of the steel pipe 2 is exposed from the second end plate overflow b at the other end of the immersion tank 3, the outer wall of the steel pipe 2 is in contact with air and enters the air cooling state, and the water flow in the inner hole of the steel pipe 2 flows out from the head of the steel pipe 2, the direction of the water flow being the same as the direction of the movement of the steel pipe 2, as shown by the water outlet c in the inner hole of the steel pipe end in FIGS. 2 and 4; when the steel pipe 2 completely leaves the end plate at the other end of the immersion tank 3, the water flow in the inner wall of the steel pipe 2 is reduced and enters the air cooling state. Thus, during the whole process from entering the immersion tank 3 to leaving the immersion tank 3, the inner wall and the outer wall of the steel pipe 2 are simultaneously cooled.

[0044] Based on the same inventive concept, another embodiment of the present invention provides a method for online liquid immersion cooling of the inner and outer walls of a steel pipe after rolling using the above-described equipment, the method comprising:

[0045] S1. The liquid level in the immersion tank 3 is adjusted by the water injection system. When the liquid level in the immersion tank 3 is higher than the height of the steel pipe 2, the head of the steel pipe 2 enters the immersion tank 3 through the overflow port on the first end plate 31. As the steel pipe 2 moves into the immersion tank 3, the outer wall of the steel pipe 2 that extends into the first end plate 31 is cooled, the inner wall is filled with cooling water and the cooling water flows in the opposite direction of the movement of the steel pipe 2, so as to achieve simultaneous cooling of the inner and outer walls of the steel pipe 2.

[0046] S2. When the steel pipe 2 is completely immersed in the immersion tank 3, both the outer and inner walls of the steel pipe 2 are cooled in the immersion state.

[0047] S3. When the head of the steel pipe 2 is exposed on the second end plate 31', the outer wall of the steel pipe 2 comes into contact with the air and enters an air-cooled state, while cooling water is injected from the tail of the steel pipe 2 and flows out from the head of the steel pipe 2, thereby achieving liquid immersion cooling of the inner wall of the steel pipe 2.

[0048] S4. When the tail of steel pipe 2 leaves the second end plate 31', the immersion cooling process of steel pipe 2 ends.

[0049] In the above embodiments of the present invention, the steel pipe enters the immersion tank from one end, which has overflow outlets at both ends. When the liquid level in the immersion tank is higher than the height of the steel pipe, the outer and inner walls of the steel pipe are immediately covered and filled with water overflowing from the end plate of the immersion tank. As the steel pipe moves into the immersion tank, the portion of the outer wall of the steel pipe extending into the end plate of the immersion tank is cooled, while the inner wall of the steel pipe is filled with water, and the water flows in the opposite direction of the steel pipe's movement, thus achieving immersion cooling of the inner wall of the steel pipe. When the entire steel pipe enters the immersion tank, both the outer and inner walls of the steel pipe are cooled in an immersion state. When the head of the steel pipe is exposed at the end plate at the other end of the immersion tank, the outer wall of the steel pipe comes into contact with the air and enters an air-cooled state, while the water flowing into the inner wall of the steel pipe is injected from the tail end of the steel pipe and flows out from the head end, with the water flow direction being the same as the direction of the steel pipe's movement. When the entire steel pipe leaves the end plate at the other end of the immersion tank, the immersion cooling process of the inner wall of the steel pipe also ends. The above embodiments of the present invention solve the problem that online cooling of steel pipes cannot simultaneously cool the outer and inner walls, achieving high strength and uniform cooling of steel pipes under liquid immersion conditions. Furthermore, since it does not require the supply of high-pressure water, it has the advantages of simple method, low equipment cost and low operating cost.

[0050] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention. The above preferred features can be used in any combination without conflict.

Claims

1. A device for realizing liquid immersion cooling of the inner and outer walls of a steel pipe after rolling, characterized in that, The application relates to a cooling device for a steel pipe, which comprises the following parts: a liquid immersion tank, which comprises a bottom plate and two end plates and two side plates arranged on the bottom plate, wherein each of the first end plate and the second end plate is provided with an overflow port; a roller conveying mechanism arranged along the longitudinal axis of the liquid immersion tank and penetrating through the liquid immersion tank, wherein the roller conveying mechanism comprises a plurality of parallel rollers, and the two ends of the rollers respectively penetrate out of the two side plates; the roller conveying mechanism is used for driving the steel pipe to enter the liquid immersion tank from the overflow port on the first end plate and to leave the liquid immersion tank from the overflow port on the second end plate; a water injection system, which is used for injecting cooling water into the liquid immersion tank and adjusting the liquid level in the liquid immersion tank; when the liquid level in the liquid immersion tank is higher than the height of the steel pipe, the cooling water in the liquid immersion tank overflows from the overflow port.

2. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 1, characterized in that, The overflow port is a hole structure.

3. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 2, characterized in that, The hole structure is a circular hole which is larger than the diameter of the steel pipe.

4. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 1, characterized in that, The overflow port is a gap which is arranged on the top end of the end plate.

5. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 4, characterized in that, The size of the gap is determined according to the diameter and deformation amount of the steel pipe.

6. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 1, characterized in that, The roller adopts a V-shaped roller, and the axis of the roller is arranged perpendicularly to the running axis of the steel pipe.

7. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 1, characterized in that, The roller adopts a V-shaped roller, and the axis of the roller is arranged at a certain angle to the running axis of the steel pipe.

8. The device for realizing liquid immersion cooling of the inner wall and the outer wall of a steel pipe after rolling according to claim 1, characterized in that, The water injection system comprises a water injection pipeline and a water injection power mechanism connected with the water injection pipeline; the water injection pipeline penetrates through one of the side plates; and the water injection power mechanism is used for adjusting the water injection rate into the liquid immersion tank.

9. The device for post-rolling liquid immersion cooling of the inner and outer walls of a steel pipe according to claim 8, characterized in that, The water injection rate of the water injection power mechanism into the liquid immersion tank is greater than the sum of the overflow rates of the overflow ports on the two end plates.

10. A method for realizing the immersion liquid cooling of the inner wall and the outer wall of a steel pipe after rolling on line, which is realized by using the device according to any one of claims 1-9, characterized in that, The application relates to a cooling device for a steel pipe, which comprises the following parts: a liquid immersion tank, which comprises a bottom plate and two end plates and two side plates arranged on the bottom plate, wherein each of the first end plate and the second end plate is provided with an overflow port; a roller conveying mechanism arranged along the longitudinal axis of the liquid immersion tank and penetrating through the liquid immersion tank, wherein the roller conveying mechanism comprises a plurality of parallel rollers, and the two ends of the rollers respectively penetrate out of the two side plates; the roller conveying mechanism is used for driving the steel pipe to enter the liquid immersion tank from the overflow port on the first end plate and to leave the liquid immersion tank from the overflow port on the second end plate; a water injection system, which is used for injecting cooling water into the liquid immersion tank and adjusting the liquid level in the liquid immersion tank; when the liquid level in the liquid immersion tank is higher than the height of the steel pipe, the cooling water in the liquid immersion tank overflows from the overflow port. The overflow port is a hole structure. The hole structure is a circular hole which is larger than the diameter of the steel pipe. The overflow port is a gap which is arranged on the top end of the end plate. The size of the gap is determined according to the diameter and deformation amount of the steel pipe. The roller adopts a V-shaped roller, and the axis of the roller is arranged perpendicularly to the running axis of the steel pipe. The roller adopts a V-shaped roller, and the axis of the roller is arranged at a certain angle to the running axis of the steel pipe. The water injection system comprises a water injection pipeline and a water injection power mechanism connected with the water injection pipeline; the water injection pipeline penetrates through one of the side plates; and the water injection power mechanism is used for adjusting the water injection rate into the liquid immersion tank. The water injection rate of the water injection power mechanism into the liquid immersion tank is greater than the sum of the overflow rates of the overflow ports on the two end plates. The application relates to a cooling device for a steel pipe, which comprises the following parts: by adjusting the liquid level in the liquid immersion tank through a water injection system, when the liquid level in the liquid immersion tank is higher than the height of the steel pipe, the head of the steel pipe enters the liquid immersion tank from the overflow port on the first end plate; with the movement of the steel pipe into the liquid immersion tank, the outer wall of the steel pipe which extends into the first end plate is cooled, the inner wall of the steel pipe is filled with cooling water and the cooling water flows in the opposite direction of the movement of the steel pipe, so that the inner wall and the outer wall of the steel pipe are simultaneously cooled; when the steel pipe completely enters the liquid immersion tank, the outer wall and the inner wall of the steel pipe are cooled in the immersion state; when the head of the steel pipe is exposed from the second end plate, the outer wall of the steel pipe is in contact with air and enters the air cooling state, cooling water is injected from the tail of the steel pipe and flows out from the head of the steel pipe, so that the inner wall of the steel pipe is immersed and cooled; when the tail of the steel pipe leaves the second end plate, the immersion cooling process of the steel pipe is ended.

Images