Stretching-in type cooling system for inner wall face of large-diameter hot-rolled seamless steel pipe

Abstract

The invention discloses a stretching-in type cooling system for the inner wall face of a large-diameter hot-rolled seamless steel pipe, and relates to the technical field of equipment for cooling the hot-rolled seamless steel pipe, the stretching-in type cooling system comprises a central main pipeline, a plurality of branch pipes, conveying rollers, a steel pipe body and a plurality of jet flow nozzle sets, a multi-jet-flow nozzle group is mounted on the branch pipe, and a conveying roller and a lifting translation mechanism for controlling the central main pipeline are mounted on the cooling system. The stretching-in type cooling system for the inner wall face of the large-diameter hot-rolled seamless steel pipe is provided with a lifting translation mechanism of a center main pipeline, the whole multiple jet flow nozzle sets are allowed to move in the axial direction of the steel pipe, the radial position is adjusted according to the inner diameter of the steel pipe, and all-directional uniform cooling is achieved; according to the design of the cooling system, rapid installation and convenient maintenance are considered, and an efficient, energy-saving and environment-friendly cooling scheme is particularly provided for cooling the inner wall face of the large-diameter hot-rolled seamless steel pipe.

Description

Technical Field

[0001] The invention relates to the technical field of equipment for cooling hot-rolled seamless steel pipes, in particular to an in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe. Background Art

[0002] Hot-rolled seamless steel pipes play a key role in many industrial applications, such as oil drilling, mechanical structural components, and heat exchangers. During the production process, after the steel pipe is rolled at high temperature, it needs to go through a cooling process to obtain the required mechanical properties and microstructure. Traditional cooling methods generally focus on cooling the outer wall while ignoring the cooling of the inner wall. This uneven cooling can lead to a large temperature difference between the inner and outer walls of the steel pipe, causing residual stress and even microcracks, ultimately affecting the overall quality and performance of the product. In the existing technology, although some cooling systems consider cooling the inner wall of the steel pipe, they mostly rely on external spray or immersion cooling. However, these methods often have difficulty in uniformly controlling the inner wall temperature of the steel pipe, resulting in unstable cooling effect and steel pipe quality. There are common problems such as uneven distribution of cooling medium, low cooling efficiency, and difficulty in controlling the cooling process. In addition, traditional shaft-end spray cooling equipment often has difficulty adapting to changes in pipe diameter and differences in the internal conditions of the steel pipe, resulting in the formation of cooling dead zones on the inner wall of the steel pipe, reducing the cooling effect.

[0003] For example, the Chinese utility model patent with publication number CN212633854U discloses an inner wall cooling system for an online cooling process of a hot-rolled seamless steel pipe, the system comprising an automatic control device, a plurality of water spraying devices and at least one air blowing device; the air blowing device comprises a main body provided with an air inlet and a plurality of first nozzles, the center line of each nozzle in the first nozzle group of the plurality of first nozzles and the center line of each nozzle in the second nozzle group respectively have a first angle and a second angle with the horizontal plane, the first angle is greater than the second angle, and the air inlet is connected to a compressed air source; the water spraying device comprises a lifting mechanism and a pipe body arranged thereon, one end of the pipe body is connected to a diversion and water collecting pipe, and the other end is provided with a nozzle, the nozzle has a plurality of second nozzles, and the plurality of second nozzles are respectively arranged at different angles to the pipe body; the automatic control device is electrically connected to the compressed air source, the nozzle and the lifting mechanism respectively.

[0004] The cooling system includes an automatic control device, multiple water spraying devices and an air blowing device. However, the device still has certain defects; Since the application scenario is online cooling of hot-rolled seamless steel pipes, the method of water spraying at the shaft end is adopted. For hot-rolled seamless steel pipes with larger sizes and longer lengths, this cooling method will cause differences in cooling speed and uneven cooling in both the circumferential direction and the length direction.

[0005] Therefore, we propose a kind of for large diameter hot-rolled seamless steel pipe inner wall surface of the extension type cooling system to solve the problems raised in the above background. SUMMARY

[0006] The present application aims to provide a kind of for large diameter hot-rolled seamless steel pipe inner wall surface of the extension type cooling system to solve the problems raised in the above background.

[0007] To achieve the above object, the present application provides the following technical solutions: a kind of for large diameter hot-rolled seamless steel pipe inner wall surface of the extension type cooling system, including center main pipe, branch pipe, conveying roller, steel pipe body and multiple jet nozzle group, the axial installation of multiple branch pipes of center main pipe, and multiple jet nozzle group is installed on branch pipe, conveying roller and the lifting translation mechanism for controlling center main pipe are installed on the cooling system, and position sensor and automation control device are installed on lifting translation mechanism, the right end of center main pipe is installed with cleaning mechanism.

[0008] Preferably, the center main pipe is installed as a multi-module splicing structure, the end of the center main pipe is provided with an internal thread, and a pipe plug with an external thread is installed in a matched manner.

[0009] With the above structure design, the center main pipe adopts a multi-module splicing structure, and the end internal thread cooperates with the pipe plug with an external thread, so that the module can be increased or decreased according to the length of the steel pipe body, and the steel pipe body of different lengths can be flexibly adapted, to ensure full-length cooling coverage.

[0010] Preferably, the end of the branch pipe is provided with an internal thread, and the multiple jet nozzle group is threadedly installed on the branch pipe.

[0011] With the above structure design, the internal thread at the end of the branch pipe is threadedly connected with the multiple jet nozzle group, so that different specifications of nozzles can be replaced to adapt to the cooling needs of different inner diameters of the steel pipe body, and ensure that the cooling medium injection angle and range match the inner wall size.

[0012] Preferably, the lifting translation mechanism and the center main pipe are installed in a linkage structure, and a driving assembly for driving the axial movement of the center main pipe is installed on the lifting translation mechanism.

[0013] With the above structure design, the driving assembly of the lifting translation mechanism drives the center main pipe to move axially along the steel pipe body, so that the multiple jet nozzle group can uniformly spray cooling medium along the length direction of the steel pipe body, avoiding local uneven cooling.

[0014] Preferably, a radial adjustment component is installed on the lifting and translation mechanism, which is used to drive the central main pipe and the multi-jet nozzle group to adjust the radial position, and the multi-jet nozzle group is arranged in a ring.

[0015] With the above-mentioned structural design, the radial adjustment component of the lifting and translation mechanism drives the radial movement of the central main pipe and the multi-jet nozzle group. Combined with the annular arrangement of the nozzle group, the cooling medium evenly covers the circumference of the inner wall of the steel pipe body, adapting to the cooling needs of steel pipe bodies with different inner diameters.

[0016] Preferably, a sensor for detecting the position of the steel pipe body is installed beside the conveying roller, and the sensor is installed to be electrically connected with the automatic control device.

[0017] With the above structural design, the sensor next to the conveyor roller detects that the steel pipe body has reached the cooling position and transmits the signal to the automatic control device. The control device starts the lifting and translation mechanism to ensure that the central main pipe is extended into the steel pipe body in time to start cooling.

[0018] Preferably, the multi-jet nozzle groups are evenly installed along the axial direction of the central main pipe, and the multi-jet nozzle groups at the same axial position are annularly installed on the branch pipe.

[0019] With the above structural design, the multi-jet nozzle groups are evenly distributed along the axial direction of the central main pipe, and the nozzles at the same axial position are annularly installed on the branch pipe, so that the cooling medium forms a uniform covering layer in both the axial and circumferential directions of the inner wall of the steel pipe body, thereby improving the cooling uniformity.

[0020] Preferably, the material of the central main pipeline is stainless steel, and its outer surface is installed with a high-temperature resistant anti-corrosion coating. Limit switches are installed at both ends of the lifting and translation mechanism, and an emergency stop button is installed in conjunction with it. A cooling medium recovery system is installed under the steel pipe body, and the recovery system is installed in a circulating connection with the cooling medium supply end of the central main pipeline.

[0021] With the above structural design, the central main pipeline is made of stainless steel and equipped with a high-temperature resistant anti-corrosion coating to ensure that it is not easily corroded and damaged in high-temperature environments, extend the service life of the equipment, and ensure stable transportation of the cooling medium. The limit switches at both ends of the lifting and translation mechanism limit its movement range to prevent the central main pipeline from excessively extending into or exiting the steel pipe body. The emergency stop button can quickly stop the equipment in an emergency to ensure safe operation. The cooling medium recovery system under the steel pipe body collects the used cooling medium, and after treatment, it is circulated to the supply end of the central main pipeline to achieve reuse of the cooling medium and reduce consumption.

[0022] Preferably, the cleaning mechanism includes a connecting column, a convex strip, a limiting ring, a clamping column, a clamping groove, a reinforcing column, a cleaning ring, a threaded column, a threaded rod and a limiting nut. A convex strip is installed on the outer side of the connecting column, and a limiting ring is installed on the left side of the connecting column. A clamping column is clamped on the connecting column, and a cleaning ring is installed on the outside of the clamping column through the reinforcing column.

[0023] With the above-mentioned structural design, the cleaning mechanism is connected to the central main pipe through a connecting column, and the convex strip on the outside of the connecting column cooperates with the clamping groove of the clamping column to realize the positioning and installation of the clamping column; the clamping column fixes the cleaning ring through the reinforcing column, and when the central main pipe extends into or out of the steel pipe body, the cleaning ring can scrape and clean the oxide scale and impurities on the inner wall of the steel pipe; the limit ring limits the installation position of the clamping column to ensure that the cleaning ring fits tightly against the inner wall of the steel pipe.

[0024] Preferably, a threaded column is installed on the left side of the connecting column, a clamping groove is opened inside the clamping column, the protrusion is slidably connected to the clamping groove, the threaded column is threadedly connected to the central main pipe, a threaded rod passes through the clamping column, and a limiting nut is installed on the right side of the threaded rod.

[0025] With the above structural design, the connecting column is threadedly connected to the central main pipe through the threaded column on the left, so that the cleaning mechanism and the central main pipe are firmly fixed; the convex strip slides along the clamping groove to facilitate the quick disassembly and assembly of the clamping column; the threaded rod passes through the clamping column and is locked by the limit nut to further fix the relative position of the clamping column and the connecting column, preventing loosening due to vibration during the cleaning process, and ensuring that the cleaning ring always maintains a stable cleaning effect.

[0026] Compared with the prior art, the present invention has the following beneficial effects: the in-line cooling system for the inner wall of large-diameter hot-rolled seamless steel pipe: 1. Improve cooling uniformity and ensure the stability of steel pipe quality The multi-jet nozzle group is evenly distributed along the axial direction of the central main pipe, and the nozzles at the same axial position are annularly installed on the branch pipe. The radial adjustment component of the lifting and translation mechanism drives the nozzle group to move radially, so that the cooling medium forms a uniform coverage layer in both the circumferential and axial directions of the inner wall of the steel pipe body, avoiding the cooling dead zone caused by traditional axial end water spraying. The central main pipe can be moved axially along the steel pipe body by the drive component, further ensuring uniform cooling throughout the entire length, reducing residual stress and microcracks caused by the temperature difference between the inner and outer walls, and improving the dimensional accuracy and mechanical properties of the steel pipe body. 2. Enhance equipment applicability and flexibility and reduce production costs The center main pipe adopts a multi-module splicing structure, and can be flexibly adjusted according to the length of the steel pipe body through cooperation of the inner thread at the tail end and the pipe plug with the outer thread. The inner thread design at the end of the branch pipe makes the multi-jet nozzle group convenient to replace, and adapts to steel pipe bodies with different inner diameters. The lifting and translating mechanism can drive the center main pipe to accurately extend into steel pipe bodies of different specifications, realize processing of multiple sizes of steel pipes by one set of equipment, and reduce equipment investment and occupied space. 3. Realize efficient energy saving and safe control, and optimize production process The cooling medium recovery system below the steel pipe body processes the used medium and then circulates and delivers it to the center main pipe, reducing resource consumption. The center main pipe is made of stainless steel and is additionally provided with a high-temperature-resistant anticorrosive coating, prolonging the service life of the equipment. The limit switch and emergency stop button of the lifting and translating mechanism guarantee operation safety, and the sensor beside the conveying roller is linked with the automatic control device to realize automation of the cooling process, reduce manual intervention, shorten the cooling cycle, and improve production efficiency.

[0027] 4. The cleaning mechanism is quickly disassembled and assembled through cooperation of the convex strip of the connecting column and the clamping groove of the clamping column, and the threaded connection of the threaded column and the center main pipe and the locking structure of the threaded rod and the limiting nut ensure stable installation. When the cleaning ring extends into or exits the steel pipe body along with the center main pipe, it can efficiently scrape off the inner wall scale and impurities, avoid the influence of impurities on the uniformity of the cooling medium injection, and facilitate replacement of the cleaning ring according to the wear condition, guaranteeing long-term stable operation of the cooling system and improving the cooling quality of the inner wall of the steel pipe.

[0028] In summary: The in-penetration cooling and annular arrangement of the multi-jet nozzle group enable the cooling medium to uniformly and effectively cover the inner wall surface of the steel pipe body, so as to realize faster heat transfer and temperature reduction. This efficient cooling process helps to reduce the cooling time and improve production efficiency. Uniform cooling helps to prevent the temperature difference between the inner and outer walls of the steel pipe body from being too large, thereby reducing the internal stress and deformation caused by the temperature difference, which is very important for improving the dimensional accuracy and mechanical properties of the steel pipe body, and finally significantly improves the overall quality of the product. The lifting and translating mechanism of the center main pipe enables the system to adapt to steel pipe bodies of different diameters and lengths, increasing the applicability and flexibility of the equipment. This design enables the same cooling system to process steel pipe bodies of various specifications, reducing the need for multiple sets of equipment, thereby saving equipment investment and land occupation. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole front view structural schematic diagram of the application; Figure 2 It is a side view structural schematic diagram of the application; Figure 3 It is a structural schematic diagram of the steel pipe body; Figure 4 This is a schematic diagram of the structure of the cleaning mechanism of the present invention after installation; Figure 5 This is a schematic diagram of the overall left side structure of the cleaning mechanism of the present invention; Figure 6 This is a schematic diagram of the overall right side structure of the cleaning mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the cleaning mechanism of the present invention when it is disassembled and replaced.

[0030] In the figure: 1. Central main pipe; 2. Branch pipe; 3. Conveyor roller; 4. Steel pipe body; 5. Multi-jet nozzle group; 6. Cleaning mechanism; 601. Connecting column; 602. Raised strip; 603. Limiting ring; 604. Snap-on column; 605. Snap-on groove; 606. Reinforcement column; 607. Cleaning ring; 608. Threaded column; 609. Threaded rod; 610. Limiting nut. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 7 The present invention provides a technical solution: an immersion cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe, comprising a central main pipe 1, branch pipes 2, conveying rollers 3, a steel pipe body 4 and a multi-jet nozzle group 5, a cleaning mechanism 6, a connecting column 601, a convex strip 602, a limiting ring 603, a clamping column 604, a clamping groove 605, a reinforcing column 606, a cleaning ring 607, a threaded column 608, a threaded rod 609 and a limiting nut 610. A plurality of branch pipes 2 are axially installed on the central main pipe 1, and a multi-jet nozzle group 5 is installed on the branch pipes 2. The cooling system is equipped with a conveying roller 3 and a lifting and translation mechanism for controlling the central main pipe 1, and the lifting and translation mechanism is equipped with a position sensor and an automatic control device.

[0033] The central main pipe 1 is installed as a multi-module splicable structure. The end of the central main pipe 1 is provided with an internal thread and is equipped with a pipe plug with an external thread.

[0034] With the above-mentioned structural design, the central main pipe 1 adopts a multi-module splicing structure. Through the internal thread at the end and the pipe plug with external thread, the modules can be increased or decreased according to the length of the steel pipe body 4, and the steel pipe body 4 of different lengths can be flexibly adapted to ensure cooling coverage of the entire length.

[0035] An internal thread is installed at the end of the branch pipe 2, and the multi-jet nozzle group 5 is installed on the branch pipe 2 through the thread.

[0036] The internal thread at the end of the branch pipe 2 is threadedly connected to the multi-jet nozzle group 5, which is convenient for replacing nozzles of different specifications to meet the cooling requirements of different inner diameters of the steel pipe body 4 and ensure that the cooling medium injection angle and range match the inner wall size.

[0037] The lifting and translation mechanism is installed with the central main pipe 1 as a linkage structure, and a driving component for driving the central main pipe 1 to move axially is installed on the lifting and translation mechanism.

[0038] The driving assembly of the lifting and translation mechanism drives the central main pipe 1 to move axially along the steel pipe body 4, so that the multi-jet nozzle group 5 can evenly spray the cooling medium along the length direction of the steel pipe body 4 to avoid local uneven cooling.

[0039] The lifting and translation mechanism is provided with a radial adjustment assembly for driving the central main pipe 1 and the multi-jet nozzle group 5 to adjust their radial positions. The multi-jet nozzle group 5 is arranged in a ring.

[0040] The radial adjustment component of the lifting and translation mechanism drives the central main pipe 1 and the multi-jet nozzle group 5 to move radially. Combined with the annular arrangement of the nozzle group, the cooling medium evenly covers the inner wall circumference of the steel pipe body 4, adapting to the cooling requirements of steel pipe bodies 4 with different inner diameters.

[0041] A sensor for detecting the position of the steel pipe body 4 is installed beside the conveying roller 3, and the sensor is installed to be electrically connected with the automatic control device.

[0042] After the sensor beside the conveying roller 3 detects that the steel pipe body 4 has reached the cooling position, it transmits the signal to the automatic control device, and the control device starts the lifting and translation mechanism to ensure that the central main pipe 1 is extended into the steel pipe body 4 in time to start cooling.

[0043] The multi-jet nozzle groups 5 are evenly installed along the axial direction of the central main pipe 1 , and the multi-jet nozzle groups 5 at the same axial position are annularly installed on the branch pipe 2 .

[0044] The multi-jet nozzle group 5 is evenly distributed axially along the central main pipe 1, and the nozzles at the same axial position are annularly installed on the branch pipe 2, so that the cooling medium forms a uniform covering layer in both the axial and circumferential directions of the inner wall of the steel pipe body 4, thereby improving the cooling uniformity.

[0045] The material of the central main pipe 1 is stainless steel, and a high-temperature resistant anti-corrosion coating is installed on its outer surface.

[0046] The central main pipe 1 is made of stainless steel and is equipped with a high-temperature resistant anti-corrosion coating to ensure that it is not easily corroded and damaged in high-temperature environments, extend the service life of the equipment, and ensure stable transportation of the cooling medium.

[0047] Limit switches are installed at both ends of the lifting and translation mechanism, and an emergency stop button is installed in conjunction with the limit switches.

[0048] The limit switches at both ends of the lifting and translation mechanism limit its range of movement to prevent the central main pipe 1 from excessively extending into or exiting the steel pipe body 4. The emergency stop button can quickly stop the equipment in an emergency to ensure safe operation.

[0049] A cooling medium recovery system is installed below the steel pipe body 4 , and the recovery system is installed in a circulating connection with the cooling medium supply end of the central main pipeline 1 .

[0050] The cooling medium recovery system below the steel pipe body 4 collects the used cooling medium, and after treatment, circulates it to the supply end of the central main pipeline 1, thereby realizing the reuse of the cooling medium and reducing consumption.

[0051] The right end of the central main pipe 1 is equipped with a cleaning mechanism 6, which includes a connecting column 601, a convex strip 602, a limiting ring 603, a clamping column 604, a clamping groove 605, a reinforcing column 606, a cleaning ring 607, a threaded column 608, a threaded rod 609 and a limiting nut 610. The outer side of the connecting column 601 is equipped with a convex strip 602, and the left side of the connecting column 601 is equipped with a limiting ring 603. The connecting column 601 is clamped with a clamping column 604, and the outer side of the clamping column 604 is equipped with a cleaning ring 607 through a reinforcing column 606. 7. The cleaning mechanism 6 is connected to the central main pipe 1 through the connecting column 601. The convex strip 602 on the outer side of the connecting column 601 cooperates with the clamping groove 605 of the clamping column 604 to realize the positioning and installation of the clamping column 604; the clamping column 604 fixes the cleaning ring 607 through the reinforcing column 606. When the central main pipe 1 extends into or out of the steel pipe body 4, the cleaning ring 607 can scrape and clean the oxide scale and impurities on the inner wall of the steel pipe; the limiting ring 603 limits the installation position of the clamping column 604 to ensure that the cleaning ring 607 fits tightly against the inner wall of the steel pipe.

[0052] A threaded column 608 is installed on the left side of the connecting column 601, and a clamping groove 605 is provided inside the clamping column 604. The protrusion 602 is slidably connected to the clamping groove 605, and the threaded column 608 is threadedly connected to the central main pipe 1. A threaded rod 609 passes through the clamping column 604, and a limiting nut 610 is installed on the right side of the threaded rod 609. The connecting column 601 is threadedly connected to the central main pipe 1 through the threaded column 608 on the left, so that the cleaning mechanism 6 and the central main pipe 1 are firmly fixed; the protrusion 602 slides along the clamping groove 605, which is convenient for the quick disassembly and assembly of the clamping column 604; the threaded rod 609 passes through the clamping column 604 and is locked by the limiting nut 610, further fixing the relative position of the clamping column 604 and the connecting column 601 to prevent loosening due to vibration during the cleaning process, and ensure that the cleaning ring 607 always maintains a stable cleaning effect.

[0053] The above cooling system can be used to perform immersion cooling on the inner wall of a large-diameter hot-rolled seamless steel pipe, comprising the following steps: Step 1: When the steel pipe body 4 is transported to the cooling zone via the conveyor rollers 3, the sensor in the system detects the presence of the steel pipe body 4 and triggers the cooling system to start; Step 2: Based on the position data of the steel pipe body 4, the lifting and translation mechanism is activated, and the central main pipe 1 is driven vertically to a preset height by a precisely controlled servo motor to align with the inlet of the steel pipe body 4; at the same time, the horizontal translation mechanism is activated to ensure that the central main pipe 1 is accurately aligned with the central axis of the steel pipe body 4; Step 3: When the central main pipe 1 is inserted into the steel pipe body 4, the cleaning ring 607 can scrape and clean the oxide scale and impurities on the inner wall of the steel pipe; the limiting ring 603 limits the installation position of the clamping column 604 to ensure that the cleaning ring 607 fits tightly against the inner wall of the steel pipe; Step 4: The central main pipe 1 is controlled by the lifting mechanism and smoothly extends into the interior of the steel pipe body 4. The speed and depth of this process are controlled by the PLC to ensure that the multi-jet nozzle group 5 enters the optimal position to ensure that the cooling water covers the entire inner wall surface; once the central main pipe 1 is in place, the multi-jet nozzle group 5 begins to spray the cooling medium; Step 5: During the cooling process, the temperature sensor continuously monitors the inner and outer wall temperatures of the steel pipe body 4. These data are fed back to the control system in real time, and the water pressure in the pipeline is dynamically adjusted according to the thermal state of the steel pipe body 4 to ensure sufficient flow and avoid local overcooling or insufficient cooling; Step 6: The cooling water is collected through a recovery system at the bottom of the steel pipe body 4, including a filter and a temperature regulating device, and the treated cooling medium is recycled again; Step 7: When the temperature sensor detects that the temperature has reached the preset value, the valve in the pipeline is closed, and the steel pipe body 4 is cooled and sent to the next area via the conveyor roller 3; the central main pipeline 1 is automatically withdrawn to the initial position, and the lifting and translation mechanism is reset; the system simultaneously performs self-inspection and cleaning to ensure that the cooling operation of the next steel pipe body 4 can be started immediately; Step 7: Start with the next steel pipe body 4 and repeat the above steps.

[0054] The infrared sensor detects whether the steel pipe body 4 reaches the cooling table, and sends a signal to the control unit after detection; the infrared sensor has high sensitivity and can accurately detect the arrival of the steel pipe body 4, ensuring timely startup of the system.

[0055] After receiving the signal from the detection unit, it instructs the lifting mechanism to work; the control unit is composed of a PLC controller with high precision and high reliability, and can realize automatic control of the entire cooling process through programming.

[0056] It consists of an electric lift and guide rails to lift the cooling main pipeline to the height of the steel pipe body 4 axis; the lifting mechanism is equipped with a precision displacement sensor, which can accurately control the lifting height to ensure the accurate positioning of the cooling center main pipeline 1.

[0057] It consists of an electric slide rail and a motor, which inserts the central main pipe 1 into the steel pipe from one end of the steel pipe body 4. The insertion process is controlled by a limit switch on the slide rail to ensure accurate insertion depth. The slide rail is made of high-strength material and has good stability and durability.

[0058] The central main pipe 1 is made of stainless steel, which is resistant to high temperature and corrosion; multiple rows of branch pipes 2 are evenly arranged on the central main pipe 1, and each row of branch pipes 2 is composed of multiple multi-jet nozzle groups 5. The multi-jet nozzle groups 5 are made of wear-resistant materials to ensure that they will not be blocked during long-term use; the spray angle of the multi-jet nozzle group 5 is adjustable to ensure that the entire inner wall surface is covered; the design of the multi-jet nozzle group 5 takes into account the distribution of liquid flow and pressure to ensure that the sprayed cooling water evenly covers the inner wall surface.

[0059] The temperature detection unit monitors the inner wall temperature of the steel pipe body 4 in real time, and transmits the data to the control unit; the temperature detection unit adopts a high-precision temperature sensor, which can quickly respond to temperature changes and ensure real-time monitoring of the cooling process.

[0060] According to the feedback data of the temperature detection unit, the opening and closing status of the water valve is adjusted; when the temperature reaches the set value, the water valve is closed and cooling is stopped; the programming logic of the control unit takes into account the different specifications and production requirements of the steel pipe body 4, and can flexibly adjust the cooling parameters.

[0061] Pull the central main pipe 1 out from the inside of the steel pipe body 4; the withdrawal process is also controlled by the limit switch on the slide rail to ensure accurate movement.

[0062] The central main pipe 1 is restored to its initial position, and when the next steel pipe body 4 arrives, the return process of the lifting mechanism is controlled by the PLC controller to ensure continuous operation of the system.

[0063] Thus, a series of tasks are completed. The contents not described in detail in this specification belong to the prior art known to professionals in this field.

[0064] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plunge cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe, comprising a central main pipe (1), a branch pipe (2), a conveying roller (3), a steel pipe body (4) and a multi-jet nozzle group (5), characterized in that: The central main pipe (1) is axially provided with a plurality of branch pipes (2), and a multi-jet nozzle group (5) is installed on the branch pipe (2). The cooling system is provided with a conveying roller (3) and a lifting and translation mechanism for controlling the central main pipe (1), and a position sensor and an automatic control device are installed on the lifting and translation mechanism. A cleaning mechanism (6) is installed at the right end of the central main pipe (1).

2. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: The central main pipe (1) is installed as a multi-module splicable structure, and the end of the central main pipe (1) is provided with an internal thread, and is matched with a pipe plug with an external thread.

3. The immersion cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: An internal thread is installed at the end of the branch pipe (2), and the multi-jet nozzle group (5) is installed on the branch pipe (2) via the thread.

4. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: The lifting and translation mechanism and the central main pipe (1) are installed in a linkage structure, and a driving component for driving the central main pipe (1) to move axially is installed on the lifting and translation mechanism.

5. The immersion cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: A radial adjustment component is installed on the lifting and translation mechanism, which is used to drive the central main pipe (1) and the multi-jet nozzle group (5) to adjust the radial position. The multi-jet nozzle group (5) is arranged in a ring.

6. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: A sensor for detecting the position of the steel pipe body (4) is installed on the side of the conveying roller (3), and the sensor is installed to be electrically connected to the automatic control device.

7. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: The multi-jet nozzle groups (5) are evenly installed along the axial direction of the central main pipe (1), and the multi-jet nozzle groups (5) at the same axial position are annularly installed on the branch pipe (2).

8. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: The central main pipe (1) is made of stainless steel, and its outer surface is provided with a high-temperature resistant anti-corrosion coating. Limit switches are provided at both ends of the lifting and translation mechanism, and an emergency stop button is provided. A cooling medium recovery system is provided below the steel pipe body (4), and the recovery system is provided in a circulating connection with the cooling medium supply end of the central main pipe (1).

9. The in-line cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 1, characterized in that: The cleaning mechanism (6) comprises a connecting column (601), a convex strip (602), a limiting ring (603), a clamping column (604), a clamping groove (605), a reinforcing column (606), a cleaning ring (607), a threaded column (608), a threaded rod (609) and a limiting nut (610). The outer side of the connecting column (601) is provided with a convex strip (602), and the left side of the connecting column (601) is provided with a limiting ring (603). The connecting column (601) is clamped with a clamping column (604), and the outer side of the clamping column (604) is provided with a cleaning ring (607) via the reinforcing column (606).

10. The immersion cooling system for the inner wall of a large-diameter hot-rolled seamless steel pipe according to claim 9, characterized in that: A threaded column (608) is installed on the left side of the connecting column (601), a clamping groove (605) is provided inside the clamping column (604), the protruding strip (602) is slidably connected to the clamping groove (605), the threaded column (608) is threadedly connected to the central main pipe (1), a threaded rod (609) passes through the clamping column (604), and a limiting nut (610) is installed on the right side of the threaded rod (609).

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