A ferritic stainless steel welded pipe manufacturing apparatus for improving low-temperature impact toughness

Abstract

The utility model discloses a kind of ferrite stainless steel welded pipe preparation equipment for improving low temperature impact toughness, it is related to steel pipe processing technical field, including heat insulation box, heat insulation box both sides are symmetrically connected with fixed plate, and heat insulation box inside is provided with the fixed structure for fixing steel pipe;The fixed structure includes the movement strip slidingly connected in the both sides of heat insulation box interior, the lower end between two movement strips is rotatably connected with rotating strip, and the both sides of heat insulation box are equipped with guide rail.The ferrite stainless steel welded pipe preparation equipment for improving low temperature impact toughness, the flexible adjustment of installation angle is realized by arc guide rail linkage system, rotating strip is driven along guide groove under movement strip, while connecting rod slides along arc guide rail, so that rotating strip is inclined to form stable triangle support, installation column and heat insulation box present acute angle at this time, space angle is automatically adjusted by mechanical linkage, so that welded pipe joint does not need artificial accurate alignment, reduce the operation step, and improve installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe processing technology, specifically to a ferritic stainless steel welded pipe preparation equipment for improving low-temperature impact toughness. Background Technology

[0002] Ferritic stainless steel welded pipe is a type of pipe made from ferritic stainless steel through welding. It has a very low carbon content and contains little or no nickel. It requires annealing during processing to improve its strength.

[0003] To achieve the above functions, Chinese patent CN203782191U discloses a steel pipe heat treatment device, which includes a heat treatment furnace, a flame jetting mechanism, and a steel pipe conveying device. The flame jetting mechanism is located above the heat treatment furnace, and the heat treatment furnace is equipped with a flame nozzle connected to the flame jetting mechanism. The flame nozzle cooperates with a steel pipe mounted on the steel pipe conveying device, which is located inside the heat treatment furnace and fixedly connected to the inner wall of the furnace. An inclined rotating shaft allows the heat-treated steel pipe to move forward while rotating without deformation; the mounting part is hollow, providing a single heat layer while offering gentle elastic support to the steel pipe, thus improving the quality of the heat-treated product.

[0004] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation: stainless steel welded pipes need to be heated multiple times for a long time during annealing. Existing stainless steel welded pipe annealing equipment generally places the stainless steel welded pipes inside along their length, resulting in a large space occupation and making it inconvenient to remove and place the stainless steel welded pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a ferritic stainless steel welded pipe preparation equipment that improves low-temperature impact toughness, in order to solve the problem in the above-mentioned background technology that the existing stainless steel welded pipe annealing equipment generally places the stainless steel welded pipe inside along its length, resulting in a large space occupation and inconvenience for the removal and placement of the stainless steel welded pipe.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a ferritic stainless steel welded pipe preparation equipment with improved low-temperature impact toughness, including a heat insulation box, wherein symmetrically distributed fixing plates are fixedly connected to both sides of the heat insulation box, and a fixing structure for fixing the steel pipe is provided inside the heat insulation box.

[0007] The fixed structure includes sliding strips that are slidably connected to both sides inside the heat insulation box, and a rotating strip that is rotatably connected between the lower ends of the two sliding strips. Guide rails are provided on both sides of the heat insulation box, and the guide rails extend in an arc shape towards the bottom of the heat insulation box.

[0008] Preferably, both ends of the rotating bar are fixedly connected to vertically distributed connecting rods, and the connecting rods are located outside the two moving bars, with the upper end of the connecting rod slidably connected to the inside of the guide rail.

[0009] Preferably, the heat insulation box has symmetrically distributed guide grooves on both sides inside, and the motion strip is slidably connected inside the guide grooves.

[0010] Preferably, the top of the rotating bar is rotatably connected to equidistant mounting columns, and the inside of the heat insulation box is fixedly connected to equidistantly distributed eddy current induction heating wires, with each eddy current induction heating wire aligned with its corresponding mounting column.

[0011] Preferably, the top of the heat insulation box is provided with equally spaced sliding holes, and a positioning rod is slidably connected inside each sliding hole. A moving plate is fixedly connected to the top of the positioning rod, and the two ends of the moving plate are slidably connected to the two sides of the heat insulation box. The lower end of the positioning rod is provided with a conical structure.

[0012] Preferably, tension springs are fixedly connected between the bottom ends of the moving plate and the sides of the heat insulation box, and guide holes are provided inside the positioning rod. Each guide hole is aligned with the corresponding eddy current induction heating wire, and the mounting column is slidably connected inside the guide hole.

[0013] Preferably, a threaded ring is fixedly connected in the middle of the heat insulation box, and an installation ring aligned with the threaded ring is fixedly connected in the middle of the rotating bar. A locking bolt is slidably connected inside the installation ring, and the locking bolt passes through the installation ring and is threaded into the inside of the threaded ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness achieves flexible adjustment of the installation angle through an arc-shaped guide rail linkage system. The rotating bar moves down along the guide groove under the drive of the moving bar, while the connecting rod slides along the arc-shaped guide rail, causing the rotating bar to tilt and form a stable triangular support. At this time, the installation column and the heat insulation box form an acute angle. The spatial angle is automatically adjusted through mechanical linkage, so that the welded pipe joint does not require precise manual alignment, reducing operation steps and improving installation efficiency.

[0016] During the heating stage, the positioning rod applies radial pressure to the end face of the welded pipe through the elastic force of the tension spring. When the welded pipe expands due to heat, the spring allows the positioning rod to move upward along the sliding hole, avoiding stress concentration caused by rigid constraints. When cooling and shrinking, the spring automatically resets, maintaining the precise alignment between the welded pipe and the eddy current induction heating wire. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2This is a schematic diagram of the guide rail structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the mounting ring structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the heat insulation box of this utility model;

[0021] Figure 5 This is a schematic diagram of the rotating bar structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the motion plate structure of this utility model.

[0023] In the diagram: 1. Insulation box; 2. Fixing plate; 3. Guide rail; 4. Moving bar; 5. Rotating bar; 6. Connecting rod; 7. Mounting column; 8. Guide groove; 9. Eddy current induction heating wire; 10. Sliding hole; 11. Tension spring; 12. Moving plate; 13. Positioning rod; 14. Guide hole; 15. Threaded ring; 16. Mounting ring; 17. Locking bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figure 1 - Figure 4 This utility model provides the following technical solution: a ferritic stainless steel welded pipe preparation equipment with improved low-temperature impact toughness, including a heat insulation box 1, with symmetrically distributed fixing plates 2 fixedly connected to both sides of the heat insulation box 1, and a fixing structure for fixing the steel pipe is provided inside the heat insulation box 1; the fixing structure includes moving strips 4 slidably connected to both sides inside the heat insulation box 1, a rotating strip 5 rotatably connected between the lower ends of the two moving strips 4, guide rails 3 are provided on both sides of the heat insulation box 1, and the guide rails 3 extend arc-shaped towards the bottom of the heat insulation box 1; vertically distributed connecting rods 6 are fixedly connected to both ends of the rotating strip 5, and the connecting rods 6 are located outside the two moving strips 4, and the upper end of the connecting rods 6 is slidably connected to the inside of the guide rails 3; symmetrically distributed guide grooves 8 are provided on both sides inside the heat insulation box 1, and the moving strips 4 are slidably connected to the inside of the guide grooves 8; equidistantly distributed mounting columns 7 are rotatably connected to the top of the rotating strip 5, and equidistantly distributed eddy current induction heating wires 9 are fixedly connected inside the heat insulation box 1, and each eddy current induction heating wire 9 is aligned with the corresponding mounting column 7.

[0026] When the operator needs to install the welded pipe, the connection between the rotating bar 5 and the heat insulation box 1 must first be disconnected. By loosening the locking bolt 17, the mounting ring 16 is separated from the threaded ring 15. At this time, the fixed state between the rotating bar 5 and the bottom of the heat insulation box 1 is released, and the moving bars 4 on both sides slide downward in the guide groove 8, driving the rotating bar 5 to move down as a whole. During this process, the upper ends of the connecting rods 6 at both ends of the rotating bar 5 slide along the arc-shaped guide rail 3. Since the guide rail 3 is an arc extending to the bottom, the connecting rods 6 will rotate around the end of the rotating bar 5 as the axis, eventually causing the rotating bar 5 to tilt and form a stable triangular support structure with the guide rail 3 and the moving bars 4. At this time, an acute angle is formed between the mounting column 7 and the heat insulation box 1, and the operator can fit the stainless steel welded pipe on the outside of the mounting column 7.

[0027] After the welded pipe is installed, the reverse drive rotating bar 5 moves upward, and the connecting rod 6 slides along the arc path of the guide rail 3, pushing the rotating bar 5 back to a horizontal state and fitting into the heat insulation box 1. The mounting ring 16 and the threaded ring 15 are fixed by the locking bolt 17 to ensure a rigid connection between the rotating bar 5 and the heat insulation box 1. At this time, the welded pipe is sent into the heat insulation box 1, and its axis is aligned with the eddy current induction heating wire 9. After the heating wire is energized, the alternating magnetic field induces eddy currents on the surface of the welded pipe, generating a uniform thermal effect and realizing post-weld tempering treatment. This process refines the grains and eliminates residual stress by controlling the heating temperature and holding time, significantly improving the low-temperature impact toughness.

[0028] Example 2: Based on Example 1, please refer to... Figure 4 - Figure 6 The present invention provides the following technical solution: The top of the heat insulation box 1 is provided with equidistantly distributed sliding holes 10, and a positioning rod 13 is slidably connected inside each sliding hole 10. A moving plate 12 is fixedly connected to the top of the positioning rod 13. The two ends of the moving plate 12 are slidably connected to the two sides of the heat insulation box 1. The lower end of the positioning rod 13 is provided with a tapered structure. Tension springs 11 are fixedly connected between the bottom of the two ends of the moving plate 12 and the two sides of the heat insulation box 1. A guide hole 14 is provided inside the positioning rod 13. Each guide hole 14 is aligned with the corresponding eddy current induction heating wire 9. The mounting column 7 is slidably connected inside the guide hole 14. A threaded ring 15 is fixedly connected in the middle of the heat insulation box 1. A mounting ring 16 aligned with the threaded ring 15 is fixedly connected in the middle of the rotating bar 5. A locking bolt 17 is slidably connected inside the mounting ring 16. The locking bolt 17 passes through the mounting ring 16 and is threadedly connected inside the threaded ring 15.

[0029] When the rotating bar 5 drives the welded pipe to rise into the heat insulation box 1, the top of the welded pipe contacts the conical positioning rod 13. Since the tension spring 11 always applies a downward pulling force to the moving plate 12, the positioning rod 13 is pressed down in the sliding hole 10. Its conical end applies radial pressure to the end face of the welded pipe, forcing the axis of the welded pipe to be strictly aligned with the center of the eddy current induction heating wire 9. This process achieves self-correction through the sliding fit between the guide hole 14 and the mounting column 7. Even if the welded pipe has slight eccentricity or bending, the conical positioning structure can automatically adjust through mechanical feedback to ensure heating uniformity.

[0030] During the heating stage, if the welded pipe deforms due to thermal expansion, the tension spring 11 can adaptively adjust the clamping force of the positioning rod 13. When the welded pipe elongates due to heat, the positioning rod 13 moves upward along the sliding hole 10 under the spring tension to avoid excessive constraint leading to stress concentration. When it cools and contracts, the spring pulls the positioning rod 13 back to its original position to maintain the alignment between the welded pipe and the heating wire 9. In addition, the locking design of the threaded ring 15 and the mounting ring 16 suppresses vibration through pre-tightening force to ensure the connection stability between the rotating bar 5 and the heat insulation box 1 at high temperatures.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ferritic stainless steel welded pipe preparation equipment with improved low-temperature impact toughness, comprising a heat insulation box (1), wherein symmetrically distributed fixing plates (2) are fixedly connected to both sides of the heat insulation box (1), and a fixing structure for fixing the steel pipe is provided inside the heat insulation box (1). Its features are: The fixed structure includes a sliding strip (4) that is slidably connected to both sides inside the heat insulation box (1), and a rotating strip (5) is rotatably connected between the lower ends of the two sliding strips (4). Guide rails (3) are provided on both sides of the heat insulation box (1), and the guide rails (3) extend in an arc shape towards the bottom of the heat insulation box (1).

2. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 1, characterized in that: Both ends of the rotating bar (5) are fixedly connected with vertically distributed connecting rods (6), and the connecting rods (6) are located outside the two moving bars (4). The upper end of the connecting rods (6) is slidably connected to the inside of the guide rail (3).

3. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 2, characterized in that: The heat insulation box (1) has symmetrically distributed guide grooves (8) on both sides inside, and the motion strip (4) is slidably connected inside the guide grooves (8).

4. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 3, characterized in that: The top of the rotating bar (5) is rotatably connected to equidistant mounting columns (7), and the heat insulation box (1) is fixedly connected to equidistant eddy current induction heating wires (9), with each eddy current induction heating wire (9) aligned with the corresponding mounting column (7).

5. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 1, characterized in that: The top of the heat insulation box (1) is provided with equally spaced sliding holes (10), and each sliding hole (10) is slidably connected to a positioning rod (13). The top of the positioning rod (13) is fixedly connected to a moving plate (12), and the two ends of the moving plate (12) are slidably connected to both sides of the heat insulation box (1). The lower end of the positioning rod (13) is set as a conical structure.

6. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 5, characterized in that: Tension springs (11) are fixedly connected between the bottom ends of the moving plate (12) and the sides of the heat insulation box (1). The positioning rod (13) has guide holes (14) inside. Each guide hole (14) is aligned with the corresponding eddy current induction heating wire (9), and the mounting column (7) is slidably connected inside the guide hole (14).

7. The equipment for preparing ferritic stainless steel welded pipes with improved low-temperature impact toughness according to claim 1, characterized in that: The heat insulation box (1) is fixedly connected to a threaded ring (15) in the middle, and the rotating bar (5) is fixedly connected to an installation ring (16) aligned with the threaded ring (15) in the middle. A locking bolt (17) is slidably connected inside the installation ring (16), and the locking bolt (17) passes through the installation ring (16) and is threaded into the inside of the threaded ring (15).

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