Production equipment and method of heat-resistant seamless steel pipe for large-diameter ultra-supercritical unit

Abstract

The present application relates to the technical field of seamless steel pipe production, and particularly relates to a heat-resistant seamless steel pipe production equipment and production method for large-diameter ultra-supercritical unit, which comprises, along a production line, a heating unit, a deformation processing unit and a clamping conveying unit in sequence. The heating unit is used for preheating and temperature equalization of a pipe blank. The deformation processing unit comprises a piercing module, a pipe rolling module, a reducing module and a sizing module, and is connected through hydraulic quick-change joints between the modules. The deformation processing unit is used for processing the seamless steel pipe. The clamping conveying unit is used for feeding the processed seamless steel pipe. The sizing unit can be installed with two-roll, three-roll or cold-drawing sizing machines. The outer tube polishing assembly is arranged downstream of the sizing unit. Compared with the prior art, the present application highlights the flexibility and adaptability of the equipment process path by setting the modular and switchable deformation processing and sizing unit, and meets the differentiated requirements of multi-specification products on structure, size and performance.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe production technology, and in particular to a production equipment and method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units. Background Technology

[0002] With the adjustment of energy structure and the continuous development of clean and efficient power generation technologies, ultra-supercritical units, as an important direction of advanced thermal power generation technology, are experiencing significantly increased operating temperatures and pressures, placing higher demands on the performance of key components, especially heat-resistant seamless steel pipes. Large-diameter heat-resistant seamless steel pipes, as core materials for key equipment such as boilers and heat exchangers, must possess excellent high-temperature strength, corrosion resistance, and dimensional stability to ensure the safe and stable operation of the units.

[0003] In the prior art, Chinese patent document CN102172625B, concerning a three-roll skew rolling mill for seamless steel pipes, describes such a mill. It includes a skew rolling front end, a skew rolling main unit, a skew rolling back end, and a transmission system. The skew rolling front end is located in front of the skew rolling main unit, and the skew rolling back end is located behind it. The transmission system is connected to the piercing rolls and tube rolling rolls of the skew rolling main unit. However, consistent with traditional methods, this equipment typically uses fixed processing units, resulting in a relatively simple process path and a lack of modular design. This makes it difficult to flexibly adapt to the production of steel pipes with multiple specifications, structures, and performance requirements. Facing products of different specifications, the equipment needs frequent changes or complex adjustments, leading to low changeover efficiency, slow production response, and difficulty in meeting market demands for diversified and personalized products. Furthermore, this fixed design results in high energy consumption and maintenance costs, limiting the flexibility of the production line and subsequent capacity increases. Simultaneously, during steel pipe production, traditional equipment lacks sufficient control over the grinding of the outer pipe wall. The tension of the grinding belt and the clamping force of the steel pipe are difficult to adjust precisely, leading to uneven belt tension and inconsistent wear, directly affecting the grinding quality of the steel pipe surface. As a result, surface defects such as scratches and burrs easily appear, reducing the overall quality of the finished product, increasing rework rates, and further impacting the efficiency of subsequent inspection and packaging. Therefore, it is evident that traditional equipment has significant shortcomings in process flexibility and surface treatment quality, restricting the improvement of production efficiency and product quality. Thus, this application discloses a production equipment and method for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a production equipment and method for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, so as to solve the problems of single process path and low switching efficiency caused by the lack of modular design in traditional steel pipe production equipment.

[0005] To achieve the above objectives, the present invention provides a production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, comprising the following components arranged sequentially along the production line:

[0006] A heating unit is used for preheating and temperature equalization of the tube blank;

[0007] The deformation processing unit includes piercing, rolling, diameter reduction, and leveling modules, which are connected by hydraulic quick-change couplings. The deformation processing unit is used to process seamless steel pipes.

[0008] A clamping and conveying unit is used to feed the processed seamless steel pipe;

[0009] A sizing unit, which can be switched to install a two-roll / three-roll / cold drawing sizing machine, is used for sizing the seamless steel pipe;

[0010] An outer tube grinding assembly is located downstream of the sizing unit. The outer tube grinding assembly includes a drive module and two grinding modules, both of which are mounted on the drive module. The outer tube grinding assembly is used to grind the sizing seamless steel pipe.

[0011] Preferably, the clamping and conveying unit includes a mounting plate sequentially installed along the production line on one side of the deformation processing unit. A first positioning platform is provided on the top of the mounting plate, a slide rail is provided above the first positioning platform, and a sliding seat is slidably installed on the slide rail. A first drive motor is provided at one end of the first positioning platform, and a threaded rod is rotatably installed at the top center of the first positioning platform. The output end of the first drive motor is fixedly connected to one end of the threaded rod. The middle part of the sliding seat is threadedly connected to the threaded rod. A clamping claw is rotatably installed on one side of the sliding seat, and a first rotating motor is provided on the other side of the sliding seat. The output end of the first rotating motor is rotatably connected to the clamping claw.

[0012] Preferably, the sizing unit is configured by default as a three-roll sizing machine. Two-roll sizing machines and three-roll sizing machines are respectively arranged on both sides of the three-roll sizing machine. The sizing unit can be configured as a rotary sizing change mode or a translational sizing change mode. A second positioning platform is provided on one side of the top of the mounting plate. Several three-roll sizing frames in the default state of the sizing unit are arranged on the second positioning platform. Three hydraulically adjustable sizing rollers are installed at 120 degrees in the middle of the three-roll sizing frames. Sizing holes are provided on the contact surfaces of the three sizing rollers.

[0013] Preferably, the drive module includes two third mounting platforms fixedly mounted on one side of the mounting plate. A rotating rod is rotatably mounted on the middle of the two third mounting platforms. Two opposite threaded sections are respectively provided on both sides of the rotating rod. A first sliding block and a second sliding block are slidably mounted on the two third mounting platforms. The first sliding block and the second sliding block are respectively threadedly connected to the two opposite threaded sections on the rotating rod. A second drive motor is provided on one side of one of the third mounting platforms. The output end of the second drive motor is fixedly connected to one side of the rotating rod. When the rotating rod rotates forward or backward, the first sliding block and the second sliding block move closer to or further away from each other.

[0014] Preferably, the two grinding modules are respectively disposed on the first sliding block and the second sliding block, and the two grinding modules are arranged opposite to each other. Each grinding module includes a mounting base fixedly mounted on the first sliding block and the second sliding block. A vertical plate is disposed on the top surface of the mounting base, and a positioning plate is disposed on one side of the vertical plate. The positioning plate is shaped like a boomerang. Positioning wheels are rotatably mounted on both sides of the end of the positioning plate away from the vertical plate. A second rotating motor is also disposed on the mounting base. A drive plate is rotatably mounted on the side of the vertical plate away from the positioning plate. A cylinder is disposed in the middle of the vertical plate. The telescopic end of the cylinder is rotatably connected to the drive plate. A tension adjustment module is rotatably mounted in the middle of the drive plate. A drive wheel is fixedly sleeved on the output end of the second rotating motor. A grinding belt is wound around the drive wheel, the positioning wheel, and the tension adjustment module. The tension adjustment module is used to adjust the tension of the grinding belt.

[0015] Preferably, the tension adjustment module includes a rotating rod rotatably mounted on the drive plate. Rotating gear discs are fixedly sleeved on both sides of the rotating rod. Several fixed rods are also movably sleeved on both sides of the rotating rod. Sliding rods are slidably installed within each of the fixed rods. Adjusting arc plates are provided on the other side of each sliding rod, and following arc plates are embedded within adjacent adjusting arc plates. Connecting rods are provided on the side of each fixed rod closest to the drive plate, with the other end of each connecting rod fixedly connected to the drive plate. Several arc-shaped drive grooves are formed on the rotating gear discs, and a drive rod that slides within the drive grooves is provided on one side of each of the sliding rods.

[0016] Preferably, one of the fixed rods is provided with an extension plate, and an installation rod is rotatably mounted on the extension plate. A first meshing gear is provided on one side of the installation rod, which meshes with the rotating gear disk. A second meshing gear is provided on the other side of the installation rod, which rotates coaxially with the first meshing gear. A toothed plate is provided on one side of the vertical plate, and the top of the toothed plate is arc-shaped. One side of the toothed plate meshes with the second meshing gear. When the cylinder pushes the drive plate to rotate, the tension adjustment module adjusts synchronously along the angle of the drive plate, and the second meshing gear rotates synchronously under the drive of the toothed plate.

[0017] This invention also discloses a method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, which is applied to the aforementioned production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, and includes the following steps:

[0018] S1. Select a solid round tube blank and place it in the heating unit for preheating and temperature equalization;

[0019] S2. The heated tube blank is sent into the deformation processing unit for piercing, rolling, diameter reduction and sizing operations. The steps may be combined or some processing modules may be skipped as needed according to different product requirements.

[0020] S3. The processed pipe is fed into the sizing unit through the clamping and conveying unit, and one of the two-roller sizing, three-roller sizing or cold drawing sizing methods is selected for sizing to meet different diameter and strength requirements.

[0021] S4. After heat treatment, the steel pipes enter the straightening, outer tube grinding and finishing unit in sequence to complete straightening, surface grinding, correction, cutting and inspection and packaging, and obtain large-diameter heat-resistant seamless steel pipe finished products that meet the standards.

[0022] Preferably, the deformation processing unit and the sizing unit can be switched between modules to form the following eight different combination paths:

[0023] a. Perforation + two-roll sizing;

[0024] b. Perforation + three-roll sizing;

[0025] c. Piercing + Rolling + Diameter Reduction + Sizing + Two-Roll Sizing;

[0026] d. Piercing + Rolling + Diameter Reduction + Sizing + Three-Roll Sizing;

[0027] e. Perforation + pipe rolling + diameter reduction + leveling + cold drawing and sizing;

[0028] f. Piercing + Rolling + Sizing + Two-roll Sizing;

[0029] g. Piercing + Rolling + Sizing + Three-roll Sizing;

[0030] h. Perforation + pipe rolling + leveling + cold drawing and sizing;

[0031] By combining switching and path methods, it is used to adapt to the production needs of seamless steel pipes with different diameters, wall thicknesses, and strength grades.

[0032] Preferably, S1 employs a continuous quenching and tempering process, coupled with an online temperature closed-loop control system, to achieve microstructure stabilization and heat resistance improvement of steel pipes of different specifications.

[0033] The beneficial effects of this invention are:

[0034] 1. This type of large-diameter ultra-supercritical unit heat-resistant seamless steel pipe production equipment and method significantly improves the flexibility and adaptability of the equipment's process path by setting up modular and switchable deformation processing and sizing units. It meets the differentiated requirements of various product specifications for structure, size, and performance. Specifically, this design allows multiple processing modules such as piercing, rolling, diameter reduction, and leveling to be quickly combined and disassembled through hydraulic quick-change joints. It can perform full-process deep processing or skip certain processes as needed, which greatly improves the equipment's response speed and processing efficiency to different steel pipe specifications and technical requirements. At the same time, it saves energy and equipment maintenance costs and promotes the diversification and personalization of the production line.

[0035] 2. This type of production equipment and method for heat-resistant seamless steel pipes used in large-diameter ultra-supercritical units, through the setting of grinding modules and tensioning mechanisms, effectively ensures the uniform grinding quality and high efficiency and stability of the outer surface of the steel pipe, providing a precise foundation for subsequent testing and packaging. Specifically, two symmetrically arranged grinding modules are driven by a drive motor to adjust the spacing of threaded rods, achieving precise clamping and grinding of steel pipes of different diameters. In conjunction with a cylinder-driven drive plate, the tension and contact angle of the grinding belt are adjusted, effectively avoiding uneven grinding belt tension or uneven wear, ensuring the continuity of the grinding process and surface smoothness, reducing rework rate and improving the stability of finished product quality. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0038] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0039] Figure 3This is a schematic diagram of the planar structure of the present invention;

[0040] Figure 4 This is a schematic diagram of the three-roller sizing frame structure of the present invention;

[0041] Figure 5 This is a schematic diagram of the outer tube grinding assembly structure of the present invention;

[0042] Figure 6 This is a partial structural diagram of the outer tube grinding assembly of the present invention;

[0043] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0044] Figure 8 This is a schematic diagram of the tension adjustment module structure of the present invention.

[0045] The diagram is marked as follows:

[0046] 1. Mounting plate; 2. First positioning table; 3. Slide rail; 4. First drive motor; 5. Threaded rod; 6. Sliding seat; 7. Clamping claw; 8. First rotating motor; 9. Three-roll sizing frame; 10. Sizing roller; 11. Sizing hole; 12. Third mounting table; 13. Rotating rod; 14. Second drive motor; 15. First sliding block; 16. Second sliding block; 17. Mounting seat; 18. Vertical plate; 19. Positioning plate; 20. Positioning wheel; 21. Drive plate; 22. Cylinder; 23. Grinding belt; 24. Rotating rod; 25. Rotating gear plate; 26. Fixed rod; 27. Sliding rod; 28. Adjusting arc plate; 29. ​​Following arc plate; 30. Drive groove; 31. Drive rod; 32. Extension plate; 33. Mounting rod; 34. First meshing gear; 35. Second meshing gear; 36. Gear plate; 37. Second rotating motor; 38. Connecting rod; 39. Second positioning table; 40. Two-roll sizing machine; 41. Cold drawing sizing machine. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0048] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] like Figures 1 to 8As shown, the production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units includes the following components arranged sequentially along the production line: a heating unit for preheating and temperature equalization of the tube blank; a deformation processing unit including piercing, rolling, diameter reduction, and sizing modules, connected by hydraulic quick-change couplings, used to process the seamless steel pipe; a clamping and conveying unit for feeding the processed seamless steel pipe; a sizing unit that can be switched between two-roll / three-roll / cold-drawing sizing mills for sizing the seamless steel pipe; and an outer tube grinding assembly located downstream of the sizing unit, comprising a drive module and two grinding modules mounted on the drive module, used to grind the sizing seamless steel pipe. The clamping and conveying unit includes a mounting plate 1 sequentially installed along the production line on one side of the deformation processing unit, with a first positioning platform 2 on the top of the mounting plate 1, and a sliding mechanism above the first positioning platform 2. A sliding seat 6 is slidably mounted on the rail 3. A first drive motor 4 is provided at one end of the first positioning table 2. A threaded rod 5 is rotatably mounted on the top center of the first positioning table 2. The output end of the first drive motor 4 is fixedly connected to one end of the threaded rod 5. The middle part of the sliding seat 6 is threadedly connected to the threaded rod 5. A clamping claw 7 is rotatably mounted on one side of the sliding seat 6. A first rotary motor 8 is provided on the other side of the sliding seat 6. The output end of the first rotary motor 8 is rotatably connected to the clamping claw 7. The sizing unit is set by default to... The three-roll sizing mill has two-roll sizing mills 40 and three-roll sizing mills 41 on its two sides respectively. The sizing unit can be set to a rotary sizing mode or a translational sizing mode. A second positioning platform 39 is set on one side of the top of the mounting plate 1. Several three-roll sizing frames 9 with the sizing unit in the default state are set on the second positioning platform 39. Three hydraulically adjustable sizing rollers 10 are installed at 120 degrees in the middle of the three-roll sizing frame 9. The contact surface of the three sizing rollers 10 is provided with sizing holes 11.

[0050] First, a solid tube blank is preheated and temperature-equalized in a heating unit to reach a suitable temperature for plastic deformation. Then, it enters the deformation processing unit, where a hollow tube is formed under the action of a piercing mill. After multiple processing steps, including rolling, diameter reduction, and sizing, the steel pipe gradually achieves the target size and shape. After deformation processing, the steel pipe is fed to the downstream process by a clamping and conveying unit located on one side. This unit controls the rotation of the threaded rod 5 via a first drive motor 4, which drives the sliding seat 6 to move along the slide rail 3, achieving precise feeding of the steel pipe. Simultaneously, the clamping jaws 7 are driven by a first rotating motor 8 to rotate and clamp the steel pipe, stabilizing its posture. After being sent to the sizing unit, the system defaults to using a three-roll sizing mill. The three sizing rollers 10 are distributed at 120 degrees around the steel pipe and are synchronously adjusted by a hydraulic system to ensure uniform radial force and precise sizing. When product specifications require different diameters or higher strength grades, the system can switch to a two-roll sizing mill by rotation or translation. The steel pipe is shaped by either the roller sizing mill 40 or the cold drawing sizing mill 41. Then, the steel pipe enters the outer pipe grinding assembly area. The two grinding modules set on the drive module adjust their spacing and angle synchronously. With the cooperation of the drive mechanism and the tensioning mechanism, the grinding belt 23 rotates continuously against the pipe surface to complete the efficient and fine grinding treatment of the outer surface of the sized steel pipe, providing a high-quality reference surface for subsequent inspection, packaging and other processes. The piercing, rolling, diameter reduction and equalization modules are connected by hydraulic quick-change joints, which allows for quick switching and combination between processing modules, providing high flexibility. Depending on the steel pipe specifications, some modules can be skipped, improving production efficiency and saving energy, and adapting to the personalized processing needs of diversified products. The three-roll sizing mill is the default device, with two rollers and the cold drawing sizing mill set on both sides to form a rotatable or translational replacement structure, which allows the equipment to quickly switch between different sizing modes according to the pipe diameter, wall thickness and strength requirements, greatly improving the flexibility and applicability of the equipment.

[0051] Furthermore, such as Figures 2 to 8 As shown, the drive module includes two third mounting platforms 12 fixedly mounted on one side of the mounting plate 1. A rotating rod 13 is rotatably mounted in the middle of the two third mounting platforms 12. Two opposite threaded sections are respectively provided on both sides of the rotating rod 13. A first sliding block 15 and a second sliding block 16 are slidably mounted on the two third mounting platforms 12. The first sliding block 15 and the second sliding block 16 are respectively threadedly connected to the two opposite threaded sections on the rotating rod 13. A second drive motor 14 is provided on one side of one of the third mounting platforms 12. The output end of the second drive motor 14 is fixedly connected to one side of the rotating rod 13. When the rotating rod 13 rotates forward or backward, the first sliding block 15 and the second sliding block 16 move closer to or further away from each other.

[0052] When the seamless steel pipe enters the grinding station after sizing, the system first identifies the outer diameter of the steel pipe and sends a signal to the second drive motor 14 through the automatic control system. The drive motor rotates, causing the rotating rod 13 connected to its output end to rotate. Since the rotating rod 13 has forward and reverse threaded sections on both sides, when rotating, the two threaded sections will drive the first sliding block 15 and the second sliding block 16, which are threaded together, to make symmetrical linear movements. If the motor rotates forward, the two sliding blocks will move closer to the center at the same time; if the motor rotates in reverse, the two sliding blocks will move away from each other at the same time, thereby adjusting the distance between the two grinding modules to match the outer diameter of the steel pipe to be processed. The sliding blocks slide in the guide rails on the two third mounting platforms 12, which has good linear guidance and stability. After the adjustment is completed, the grinding modules on the two sliding blocks are located on both sides of the steel pipe. By further adjusting the contact angle between the tensioning mechanism in the drive module and the grinding belt 23, the outer wall of the steel pipe is ground synchronously. The entire adjustment process is controlled by a single motor. The adjustment process is quick and the positioning is accurate, providing reliable structural support and accuracy guarantee for subsequent grinding operations.

[0053] Furthermore, such as Figures 2 to 8 As shown, two grinding modules are respectively mounted on the first sliding block 15 and the second sliding block 16, and the two grinding modules are arranged opposite to each other. The grinding module includes a mounting base 17 fixedly mounted on the first sliding block 15 and the second sliding block 16. A vertical plate 18 is provided on the top surface of the mounting base 17. A positioning plate 19 is provided on one side of the vertical plate 18. The positioning plate 19 is shaped like a boomerang. Positioning wheels 20 are rotatably mounted on both sides of the end of the positioning plate 19 away from the vertical plate 18. A second rotating motor 37 is also provided on the mounting base 17. A drive plate 21 is rotatably mounted on the side of the vertical plate 18 away from the positioning plate 19. A cylinder 22 is provided in the middle of the vertical plate 18. The telescopic end of the cylinder 22 is rotatably connected to the drive plate 21. A tension adjustment module is rotatably mounted in the middle of the drive plate 21. A drive wheel is fixedly sleeved on the output end of the second rotating motor 37. A grinding belt 23 is wound around the drive wheel, the positioning wheel 20 and the tension adjustment module. The tension adjustment module is used to adjust the tension of the grinding belt 23.

[0054] After the seamless steel pipe, having undergone sizing, is fed into the grinding station, two grinding modules mounted on sliding blocks automatically adjust their spacing according to the preset pipe diameter, symmetrically clamping both sides of the pipe by moving the sliding blocks. Each grinding module's mounting base 17 provides stable structural support, and its top is equipped with a vertical plate 18 providing a platform for the drive and guide mechanisms. A boomerang-shaped positioning plate 19 is fixed to one side of the vertical plate 18, and positioning wheels 20 are respectively installed on both sides of the positioning plate 19 away from the vertical plate 18 to guide the grinding belt 23 along a set path. The other side of the vertical plate 18... A drive plate 21 is rotatably mounted on one side, on which a tension adjustment module is installed. The drive plate 21 is connected to a cylinder 22 located in the middle. The extension and retraction of the cylinder 22 can drive the drive plate 21 to rotate, thereby adjusting the contact angle between the grinding belt 23 and the steel pipe to adapt to pipes of different specifications and eccentric states. The output end of the second rotating motor 37 drives the grinding belt 23 to run along a predetermined path through the drive wheel. The grinding belt 23 is supported by the drive wheel, the positioning wheel 20 and the tension module and forms a closed path, driving the abrasive to run continuously and continuously grind the outer surface of the steel pipe.

[0055] Furthermore, such as Figures 2 to 8 As shown, the tension adjustment module includes a rotating rod 24 rotatably mounted on a drive plate 21. Rotating gear discs 25 are fixedly sleeved on both sides of the rotating rod 24. Several fixed rods 26 are also movably sleeved on both sides of the rotating rod 24. Sliding rods 27 are slidably installed within each of the fixed rods 26. Adjusting arc plates 28 are provided on the other side of each sliding rod 27, and following arc plates 29 are embedded within adjacent adjusting arc plates 28. Connecting rods 38 are provided on the side of each fixed rod 26 near the drive plate 21, with the other end of the connecting rod 38 fixedly connected to the drive plate 21. Several arc-shaped drive grooves 30 are formed on the rotating gear discs 25, and one side of each sliding rod 27 is provided with a drive groove 30. The internal sliding drive rod 31 has an extension plate 32 on one of the fixed rods 26. An installation rod 33 is rotatably mounted on the extension plate 32. A first meshing gear 34 is provided on one side of the installation rod 33, which meshes with the rotating gear disk 25. A second meshing gear 35 is provided on the other side of the installation rod 33, which rotates coaxially with the first meshing gear 34. A toothed plate 36 is provided on one side of the vertical plate 18. The top of the toothed plate 36 is arc-shaped. One side of the toothed plate 36 meshes with the second meshing gear 35. When the cylinder 22 pushes the drive plate 21 to rotate, the tension adjustment module adjusts synchronously along the angle of the drive plate 21. The second meshing gear 35 rotates synchronously under the drive of the toothed plate 36.

[0056] When the seamless steel pipe enters the grinding station, in order to ensure that the grinding belt 23 fits tightly against the surface of the steel pipe and has a suitable tension, the tension adjustment module automatically adjusts according to the grinding angle. The grinding angle is adjusted by the drive plate 21, and its rotation is driven by the cylinder 22. When the cylinder 22 extends or retracts, it drives the drive plate 21 to rotate around its rotation axis. At the same time, through the connecting rod 38 fixed on the drive plate 21, all the fixed rods 26 move synchronously with the drive plate 21. When the cylinder 22 extends or retracts, its telescopic end pushes the drive plate 21 to rotate around its rotation axis. Since one end of the connecting rod 38 is fixed to the drive plate 21 and the other end is connected to the near end face of each fixed rod 26, the rotation of the drive plate 21 will drive all the fixed rods 26 to move synchronously around the drive plate 21.

[0057] During the rotation of the drive plate 21, the second meshing gear 35 on the tension adjustment module and the toothed plate 36 located on one side of the vertical plate 18 are always meshed. The arc structure of the toothed plate 36 ensures continuous and stable rotation drive throughout the rotation process. The second meshing gear 35 drives the first meshing gear 34 to rotate through the coaxial transmission structure, thereby driving the mounting rod 33 mounted on the extension plate 32 to rotate synchronously. The rotation of the mounting rod 33, in turn, drives the rotating gear disk 25 connected to it to rotate synchronously. The rotating gear disk 25 is provided with multiple arc-shaped drive grooves 30, and a drive rod 31 is provided inside. As the gear disk rotates, the drive rod 31 moves along the drive groove 30, causing the sliding rod 27 connected to it to slide axially inside the fixed rod 26. The front end of the sliding rod 27 is fixedly connected to an adjusting arc plate 28. Deformable following arc plates 29 are embedded between the multiple adjusting arc plates 28, thereby realizing the radial "opening" or "closing" action of the adjustment component, thereby synchronously adjusting the tension and coverage contour of the grinding belt 23.

[0058] Furthermore, such as Figure 1 As shown, a method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, using the aforementioned production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, includes the following steps:

[0059] S1. Select a solid round tube blank and place it in the heating unit for preheating and temperature equalization;

[0060] S2. The heated tube blank is sent to the deformation processing unit for piercing, rolling, diameter reduction and sizing operations. The steps are combined or some processing modules are skipped as needed according to different product requirements.

[0061] S3. The processed pipe is fed into the sizing unit through the clamping and conveying unit, and one of the two-roller sizing, three-roller sizing or cold drawing sizing methods is selected for sizing to meet different diameter and strength requirements.

[0062] S4. After heat treatment, the steel pipes are sequentially entered into the straightening, outer tube grinding and finishing unit to complete straightening, surface grinding, correction, cutting and inspection and packaging, and obtain large-diameter heat-resistant seamless steel pipe finished products that meet the standards.

[0063] S1 adopts a continuous quenching and tempering process, combined with an online temperature closed-loop control system, to achieve microstructure stabilization and heat resistance improvement of steel pipes of different specifications.

[0064] First, high-quality solid round tube blanks are selected and fed into a heating unit for continuous heating. The heating process combines quenching and tempering, and an online closed-loop temperature control system is configured to ensure uniform and stable temperature of the tube blank, thereby optimizing subsequent plastic deformation performance. After heating, the tube blank enters the deformation processing unit, where piercing, rolling, diameter reduction, and straightening operations are performed according to different product requirements. The entire process can be completed, or certain modules can be skipped as needed to improve efficiency. The processed tube enters the clamping and conveying unit, and after precise alignment, it is sent to the sizing unit. The sizing unit can select three sizing methods (two-roll, three-roll, and cold drawing) for corresponding processing to achieve precise outer diameter control, uniform wall thickness, and mechanical property adjustment. After sizing, the steel pipe undergoes heat treatment and is sent to the downstream straightening, grinding, and finishing area, where the steel pipe's appearance is finished, cut, corrected, and non-destructive testing is performed.

[0065] Furthermore, when the deformation processing unit and the sizing unit can be switched by modules to form a, piercing + two-roll sizing and b, piercing + three-roll sizing;

[0066] This process first places the solid round tube blank in a heating unit for preheating and temperature equalization to reach the required piercing temperature. Then, the hot tube blank enters the piercing mill to form a hollow tube. Depending on the requirements, a two-roll or three-roll sizing method is selected, and the tube is directly fed into the corresponding sizing mill for precise dimensional control and outer diameter shaping. Since this process does not include tube rolling, diameter reduction, or equalization, the processing cycle is faster and it is suitable for process scenarios with small wall thickness fluctuations and uniform structure. After sizing, the steel pipe enters subsequent processes such as grinding, straightening, and inspection to finally form a qualified finished product.

[0067] Furthermore, the deformation processing unit and the sizing unit can be switched through modules to form c, piercing + rolling + reducing diameter + leveling + two-roll sizing, d, piercing + rolling + reducing diameter + leveling + three-roll sizing, and e, piercing + rolling + reducing diameter + leveling + cold drawing sizing.

[0068] After heat treatment, the tube blank is first fed into the piercing mill to form a rough tube. The rough tube then enters the rolling mill for initial dimensional determination, and then enters the reducing mill to reduce the outer diameter. Next, the wall thickness distribution and tube concentricity are further optimized by the leveling module to ensure the accuracy of subsequent sizing. After that, the appropriate sizing mode (three-roll, two-roll, or cold drawing) is selected according to the product requirements for final shaping. Cold drawing is suitable for products with high strength requirements, as it can introduce a strengthening effect through plastic deformation. After processing, the steel tube continues to enter the straightening, grinding, and finishing stages to complete the final processing. It is suitable for product types with high requirements for both precision and performance.

[0069] Furthermore, when the deformation processing unit and the sizing unit can be switched by modules to form f, piercing + rolling + leveling + two-roll sizing, g, piercing + rolling + leveling + three-roll sizing and h, piercing + rolling + leveling + cold drawing sizing;

[0070] In this process, solid tube blanks are heated and fed into the piercing unit to form hollow tubes. They then enter the tube rolling module for initial outer diameter and wall thickness adjustment. Afterward, the tube is sizing module to correct the wall thickness and optimize concentricity, eliminating the diameter reduction operation, simplifying the process, and improving overall production efficiency. Next, depending on the product requirements, the steel tube is sizing by two-roll, three-roll, or cold drawing methods to ensure its geometric accuracy and final mechanical properties. The steel tube then enters the post-processing section for surface grinding, straightening, cutting, and inspection. This process saves energy while still meeting the technical requirements of conventional structural pipes and heat-resistant pipes.

[0071] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0072] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A production equipment for heat-resistant seamless steel pipes used in large-diameter ultra-supercritical units, characterized in that, Including those arranged sequentially along the production line: Heating unit; The deformation processing unit includes piercing, rolling, diameter reduction, and leveling modules, which are connected by hydraulic quick-change couplings. Clamping and conveying unit; The sizing unit can be switched to install a two-roll / three-roll / cold drawing sizing machine for sizing seamless steel pipes; The outer tube grinding assembly is located downstream of the sizing unit. The outer tube grinding assembly includes a drive module and two grinding modules, both of which are mounted on the drive module. The outer tube grinding assembly is used to grind the sizing seamless steel pipe. Two grinding modules are respectively mounted on the first sliding block and the second sliding block, and the two grinding modules are arranged opposite to each other. Each grinding module includes a mounting base, a vertical plate on the top surface of the mounting base, a second rotating motor on the mounting base, a drive plate rotatably mounted on one side of the vertical plate, a cylinder in the middle of the vertical plate, the telescopic end of the cylinder being rotatably connected to the drive plate, a tension adjustment module rotatably mounted in the middle of the drive plate, a drive wheel fixedly mounted on the output end of the second rotating motor, and a grinding belt is wound around the drive wheel, the positioning wheel, and the tension adjustment module. The tension adjustment module is used to adjust the tension of the grinding belt. The tension adjustment module includes a rotating rod rotatably mounted on a drive plate. Rotating gear disks are fixedly sleeved on both sides of the rotating rod. Several fixed rods are also movably sleeved on both sides of the rotating rod. Sliding rods are slidably installed in the fixed rods. Adjusting arc plates are provided on the other side of the sliding rods. Following arc plates are embedded in adjacent adjusting arc plates. Connecting rods are provided on the side of the fixed rods near the drive plate. The other end of the connecting rods is fixedly connected to the drive plate. Several arc-shaped drive grooves are opened on the rotating gear disks. A drive rod that slides inside the drive groove is provided on one side of the sliding rods. One of the fixed rods is equipped with an extension plate, on which an installation rod is rotatably mounted. A first meshing gear is provided on one side of the installation rod, meshing with a rotating gear disk. A second meshing gear is provided on the other side of the installation rod, rotating coaxially with the first meshing gear. A toothed plate is provided on one side of the vertical plate, with the top of the toothed plate being arc-shaped. One side of the toothed plate meshes with the second meshing gear. When the cylinder pushes the drive plate to rotate, the tension adjustment module adjusts synchronously along the angle of the drive plate, and the second meshing gear rotates synchronously under the drive of the toothed plate.

2. The production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units according to claim 1, characterized in that, The clamping and conveying unit includes a mounting plate that is sequentially installed along the production line on one side of the deformation processing unit. A first positioning platform is provided on the top of the mounting plate, and a slide rail is provided above the first positioning platform. A sliding seat is slidably installed on the slide rail. A first drive motor is provided at one end of the first positioning platform. A threaded rod is rotatably installed in the middle of the top of the first positioning platform. The output end of the first drive motor is fixedly connected to one end of the threaded rod. The middle of the sliding seat is threadedly connected to the threaded rod. A clamping claw is rotatably installed on one side of the sliding seat. A first rotary motor is provided on the other side of the sliding seat. The output end of the first rotary motor is rotatably connected to the clamping claw.

3. The production equipment for large-diameter ultra-supercritical unit heat-resistant seamless steel pipes according to claim 2, characterized in that, The sizing unit is set to a three-roll sizing machine by default. Two-roll sizing machines and three-roll sizing machines are set on both sides of the three-roll sizing machine. The sizing unit can be set to a rotary sizing change mode or a translational sizing change mode. A second positioning platform is set on one side of the top of the mounting plate. Several three-roll sizing frames of the sizing unit in the default state are set on the second positioning platform. Three hydraulically adjustable sizing rollers are installed at 120 degrees in the middle of the three-roll sizing frame. The contact surface of the three sizing rollers is provided with sizing holes.

4. The production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units according to claim 3, characterized in that, The drive module includes two third mounting platforms fixedly mounted on one side of the mounting plate. A rotating rod is rotatably mounted in the middle of the two third mounting platforms. Two opposite threaded sections are respectively provided on both sides of the rotating rod. A first sliding block and a second sliding block are slidably mounted on the two third mounting platforms. The first sliding block and the second sliding block are threadedly connected to the two opposite threaded sections on the rotating rod. A second drive motor is provided on one side of one of the third mounting platforms. The output end of the second drive motor is fixedly connected to one side of the rotating rod. When the rotating rod rotates forward or backward, the first sliding block and the second sliding block move closer to each other or further away. A positioning plate is provided on one side of the vertical plate. The positioning plate is shaped like a boomerang. Positioning wheels are rotatably mounted on both sides of the end of the positioning plate away from the vertical plate.

5. A method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units, applied to the production equipment for heat-resistant seamless steel pipes for large-diameter ultra-supercritical units as described in claim 1, characterized in that... Includes the following steps: S1. Select a solid round tube blank and place it in the heating unit for preheating and temperature equalization; S2. The heated tube blank is sent to the deformation processing unit for piercing, rolling, diameter reduction and sizing operations. The steps are combined or some processing modules are skipped as needed according to different product requirements. S3. The processed pipe is fed into the sizing unit through the clamping and conveying unit, and one of the two-roller sizing, three-roller sizing or cold drawing sizing methods is selected for sizing to meet different diameter and strength requirements. S4. After heat treatment, the steel pipes enter the straightening, outer tube grinding and finishing unit in sequence to complete straightening, surface grinding, correction, cutting and inspection and packaging, and obtain large-diameter heat-resistant seamless steel pipe finished products that meet the standards.

6. The method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units according to claim 5, characterized in that, The deformation processing unit and the sizing unit can be switched between modules to form the following eight different combination paths: a. Perforation + two-roll sizing; b. Perforation + three-roll sizing; c. Piercing + Rolling + Diameter Reduction + Sizing + Two-Roll Sizing; d. Piercing + Rolling + Diameter Reduction + Sizing + Three-Roll Sizing; e. Perforation + pipe rolling + diameter reduction + leveling + cold drawing and sizing; f. Piercing + Rolling + Sizing + Two-roll Sizing; g. Piercing + Rolling + Sizing + Three-roll Sizing; h. Perforation + pipe rolling + leveling + cold drawing and sizing; By combining switching and path methods, it is used to adapt to the production needs of seamless steel pipes with different diameters, wall thicknesses, and strength grades.

7. The method for producing heat-resistant seamless steel pipes for large-diameter ultra-supercritical units according to claim 6, characterized in that, S1 employs a continuous quenching and tempering process, coupled with an online temperature closed-loop control system, to achieve microstructure stabilization and heat resistance improvement for steel pipes of different specifications.

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