A high-temperature-resistant steel pipe weld heat treatment device

Abstract

The application relates to the technical field of steel pipe processing, and discloses a high-temperature-resistant steel pipe weld heat treatment device, which comprises a rack, a heat treatment temperature insulation box arranged on the rack, a heating device arranged in the heat treatment temperature insulation box and a conveying roller arranged on the rack; one end of the rack is provided with a waste heat recovery mechanism, and the waste heat recovery mechanism comprises a waste heat recovery frame movably arranged at one end of the rack; one end of the rack is provided with a preheating mechanism. The high-temperature-resistant steel pipe weld heat treatment device is provided with the waste heat recovery mechanism matched with the preheating mechanism, the waste heat after steel pipe heat treatment is used as a preheating heat source, and the waste heat recovery and preheating are realized during the movement of the steel pipe, the efficient recycling of energy and the high integration of the process are realized, the online heat recovery mode of immediate production and immediate use is realized, the comprehensive energy consumption is greatly reduced, the whole equipment layout is more compact, and integrated and efficient operation is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe processing, and in particular to a high-temperature-resistant steel pipe weld heat treatment device. BACKGROUND

[0002] In the fields of pipe production and pressure vessel manufacturing, it is often necessary to splice multiple steel pipes into longer pipelines through welding, which forms circumferential welds at the connection. During the welding process, sharp heating and cooling will generate huge residual stress in the weld and its nearby heat-affected zone, and may form undesirable metallographic structures such as hardened structure, which will greatly reduce the toughness and crack resistance of the region, posing a serious safety hazard. Therefore, local heat treatment of the weld is a key process step for stress relief, microstructure improvement, and restoration of material mechanical properties, and is crucial for ensuring structural integrity and service safety.

[0003] However, the existing automatic heat treatment device has certain defects in actual application. First, in the preheating stage, the device often lacks an efficient heat recovery mechanism, resulting in a large amount of residual heat from the steel pipe after heat treatment being directly dissipated into the environment, causing significant energy waste. At the same time, its preheating method is usually rather rough and cannot smoothly and gradually raise the temperature of the steel pipe entering the heating zone, which will cause thermal shock and affect the final heat treatment quality.

[0004] In addition, at the moment when the steel pipe just ends the high-temperature heat treatment, the metal in the weld area is in a very soft high-temperature plastic state with extremely low strength. If the conventional hard conveying roller is used to support and convey the workpiece at this moment, the contact between the conveying roller and the soft metal will inevitably cause indentation, scratches, or even permanent deformation, seriously damaging the surface quality and dimensional accuracy of the workpiece. SUMMARY

[0005] The technical problem to be solved by the present application is that the existing technology lacks heat recovery and gradient heating mechanisms in the preheating stage, resulting in energy waste and thermal shock, and the use of hard rollers during high-temperature conveying causes surface damage to the workpiece. To solve this problem, the present application provides a high-temperature-resistant steel pipe weld heat treatment device.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a high-temperature-resistant steel pipe weld heat treatment device, comprising a rack, a heat treatment temperature insulation box arranged on the rack, a heating device arranged in the heat treatment temperature insulation box, and a conveying roller arranged on the rack.

[0007] One end of the rack is provided with a residual heat recovery mechanism, which comprises a residual heat recovery frame movably arranged at one end of the rack. The upper end of the residual heat recovery frame is provided with a hollow recovery ring, and the inner wall of the recovery ring is provided with suction holes. A blower is arranged on the residual heat recovery frame, and the air inlet of the blower is in communication with the recovery ring.

[0008] One end of the rack is provided with a preheating mechanism, the preheating mechanism includes a preheating frame movably arranged at the end of the rack away from the waste heat recovery mechanism, the upper end of the preheating frame is provided with a hollow preheating ring, the inner wall of the preheating ring is provided with a blowing hole, the inner side of the upper end of the preheating frame is provided with a cavity, the inner side of the cavity is movably provided with a hollow rack plate, one end between the waste heat recovery frame and the preheating frame is provided with a connecting pipe, one end of the connecting pipe is connected with the air outlet of the air blower, the other end is communicated with the cavity, one end of the cavity is provided with an air inlet hole communicated with the preheating ring, the bottom of the rack plate is provided with a tapered gradually changing groove corresponding to the air inlet hole, the top end of the preheating frame is rotatably provided with a sleeve, the outer side of the sleeve is provided with an adjusting gear engaged with the rack plate, one side of the heat treatment temperature insulation box is provided with a pore size adjusting shaft corresponding to the sleeve, the sleeve is movably sleeved on the outside of the pore size adjusting shaft, the outer wall of the pore size adjusting shaft is provided with a spiral guide groove, the inner wall of the sleeve is provided with a guide block movably matched with the guide groove, the top of the rack is provided with a mounting sliding groove, the mounting sliding groove is movably provided with a moving slide plate for driving the displacement of the waste heat recovery frame and the preheating frame.

[0009] Preferably, the rack is provided with a driving mechanism for driving the displacement of the moving slide plate, the driving mechanism includes a rack arranged on one side of the moving slide plate, a driven gear rotatably arranged on the inner side of the side wall of one end of the mounting sliding groove and engaged with the rack, and a driving gear engaged with one side of the driven gear, and the rack is provided with a driving source for driving the rotation of the driving gear.

[0010] Preferably, the inner cavity of the cavity is provided with a guide rod matched with the inner cavity of the rack plate at the end away from the connecting pipe, and the rack plate is movably sleeved on the outside of the guide rod.

[0011] Preferably, the rack is provided with a support on each side of the upper end, a rotating shaft is rotatably arranged between the two supports, and the conveying rollers are movably connected to the outer sides of the two ends of the rotating shaft.

[0012] Preferably, the lower side of the conveying roller is provided with an avoiding assembly for driving the axial displacement of the conveying roller along the rotating shaft, the avoiding assembly includes a traction frame movably arranged on the top of the rack, the upper end of the traction frame is rotatably connected with the end of the conveying roller, one side of the traction frame is provided with a guide wheel corresponding to the moving slide plate, the top of the moving slide plate is provided with a straight groove, and the two ends of the straight groove are respectively provided with isosceles trapezoidal convex grooves, and the guide wheel is used for movably guiding the straight groove and the convex grooves.

[0013] Preferably, the straight groove, the convex groove and the guide wheel are configured such that when the guide wheel is located in the inner side of the straight groove, the conveying roller is in a corresponding state with the recovery ring and the preheating ring, and when the guide wheel is located at the end of the convex groove away from the straight groove, the conveying roller is in a staggered state with the recovery ring and the preheating ring.

[0014] Preferably, the proximal ends of the two conveying rollers on the same rotating shaft are provided with arc-shaped recesses along the circumferential direction of the conveying roller, and the arc-shaped recesses are matched with the steel pipe.

[0015] Preferably, the guide wheel is arranged on one side of the traction frame.

[0016] Preferably, the conveying roller is movably connected with the rotating shaft.

[0017] Preferably, the top of the frame is provided with a linear guide rail corresponding to the traction frame, and the bottom of the traction frame is movably connected with the linear guide rail, and the moving direction is parallel to the axis of the rotating shaft.

[0018] Technical effects and advantages of the present application:

[0019] In the present application, the waste heat recovery mechanism cooperates with the preheating mechanism, and the waste heat after steel pipe heat treatment is used as a preheating heat source. The waste heat recovery and preheating are realized during the movement of the steel pipe, the energy is efficiently recycled and utilized, and the process is highly integrated. The online heat recovery mode is realized, the heat treatment, heat recovery and preheating are seamlessly integrated into a dynamic unit along the steel pipe movement, which greatly reduces the comprehensive energy consumption, and makes the whole equipment layout more compact, realizes the integration and high efficiency operation; as the preheating ring moves to the area to be heated along with the steel pipe, the effective path of the hot air channel blowing to the steel pipe will increase, so that the steel pipe can be linearly heated from weak to strong before reaching the heating device, realizing a soft gradient preheating mode, effectively avoiding the thermal shock caused by temperature mutation, reducing the generation of internal stress of the material, laying a perfect process foundation for the uniform and excellent metallographic structure of the subsequent main heat treatment, and significantly improving the quality and consistency of the heat treatment.

[0020] In the present application, the avoidance assembly can actively push the conveying roller away before the high-temperature and soft weld area reaches the conveying roller, so that the heat treatment part passes in a non-contact state, and the annular recovery ring and preheating ring also pass conveniently. After the area passes, the avoidance assembly makes the conveying roller reset immediately to continue to support the subsequent pipe body. This kind of local, dynamic and non-contact transition mode eliminates the risk of indentation and deformation in the key area through simple and reliable mechanical action, and guarantees the perfect appearance and geometric precision of the steel pipe. BRIEF DESCRIPTION OF DRAWINGS

[0021] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference numerals are used to refer to the same parts:

[0022] Figure 1 is a structural schematic view of the present application;

[0023] Figure 2 is a structural schematic view of another perspective of the present application;

[0024] Figure 3 The structural schematic diagram of the rack and the support in the disassembled state of the mobile slide plate of the application;

[0025] Figure 4 The structural schematic diagram of the conveying roller, the waste heat recovery frame, the preheating frame, and the heat treatment temperature insulation box in the matched state;

[0026] Figure 5 The structural schematic diagram of the base from the bottom perspective; Figure 4

[0027] Figure 6 The structural schematic diagram of the conveying roller, the mobile slide plate, the heat treatment temperature insulation box, and the aperture adjusting shaft in the disassembled state;

[0028] Figure 7 The overall structural schematic diagram of the mobile slide plate, the waste heat recovery frame, and the preheating frame;

[0029] Figure 8 The overall structural schematic diagram of the conveying roller and the rotating shaft;

[0030] Figure 9 The structural schematic diagram of the conveying roller, the rotating shaft, and the traction frame in the disassembled state;

[0031] Figure 10 The structural schematic diagram of the connecting pipe, the recovery ring, the air blower, and the waste heat recovery frame in the disassembled state;

[0032] Figure 11 The structural schematic diagram of the preheating frame;

[0033] Figure 12 The structural schematic diagram of the rack plate, the preheating frame, and the adjusting gear in the disassembled state;

[0034] Figure 13 The side view cross-sectional structural schematic diagram of the preheating frame;

[0035] Figure 14 The structural schematic diagram of the waste heat recovery frame and the preheating frame together with the steel pipe displacement to the limit distance state.

[0036] ​Legend: 1, rack; 2, heat treatment temperature box; 3, conveying roller; 4, support; 5, waste heat recovery frame; 6, preheating frame; 7, aperture adjustment shaft; 8, mounting sliding groove; 9, guide groove; 10, moving sliding plate; 11, driving source; 12, connecting pipe; 13, rack; 14, heating device; 15, straight groove; 16, convex groove; 17, adjusting gear; 18, blower; 19, recovery ring; 20, preheating ring; 21, driven gear; 22, driving gear; 23, traction frame; 24, guide wheel; 25, suction hole; 26, blowing hole; 27, guide block; 28, sleeve; 29, guide rod; 30, rack plate; 31, gradual change groove; 32, cavity; 33, air inlet; 34, rotating shaft. DETAILED DESCRIPTION

[0037] It is easy to understand that according to the technical scheme of the present application, those skilled in the art can propose various structural modes and implementation modes that can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and the accompanying drawings are only exemplary description of the technical scheme of the present application, and should not be regarded as the whole or regarded as the limitation or restriction of the technical scheme of the present application.

[0038] Reference Figures 1-7 , Figures 10-14 As shown in the drawings, Figure 1 A high-temperature-resistant steel pipe weld heat treatment device, comprising a rack 1, a heat treatment temperature box 2 is arranged at the middle of the upper end of the rack 1, a heating device 14 is arranged in the heat treatment temperature box 2, the heating device 14 is used to realize the heat treatment of the steel pipe weld, supports 4 are installed on both sides of the upper end of the rack 1, a plurality of rotating shafts 34 are rotatably arranged between the two supports 4, conveying rollers 3 are arranged on the rotating shafts 34, the rotating shafts 34 are connected through belts and pulleys, the synchronous rotation of the rotating shafts 34 is realized through special motor control, which belongs to the conventional driving mode of the conventional roller conveyor, and the present application does not make too much repetition.

[0039] The difference from the prior art is that a waste heat recovery mechanism is arranged at one end of the rack 1, the waste heat recovery mechanism comprises a waste heat recovery frame 5 movably arranged at one end of the rack 1, a hollow recovery ring 19 is arranged at the upper end of the waste heat recovery frame 5, suction holes 25 are uniformly arranged on the inner wall of the recovery ring 19, a blower 18 is arranged on the waste heat recovery frame 5, the air inlet of the blower 18 is communicated with the recovery ring 19, further, a preheating mechanism is arranged at the other end of the rack 1, the preheating mechanism comprises a preheating frame 6 movably arranged at the end of the rack 1 away from the waste heat recovery mechanism, a hollow preheating ring 20 is arranged at the upper end of the preheating frame 6, blow holes 26 are uniformly arranged on the inner wall of the preheating ring 20, a cavity 32 is arranged on the inner side of the upper end of the preheating frame 6, a hollow rack plate 30 is movably arranged in the cavity 32, a connecting pipe 12 is arranged at one end between the waste heat recovery frame 5 and the preheating frame 6, one end of the connecting pipe 12 is connected with the air outlet of the blower 18, the other end is communicated with the cavity 32, an air inlet hole 33 communicated with the preheating ring 20 is arranged at one end of the cavity 32, a tapered gradual change groove 31 corresponding to the air inlet hole 33 is arranged at the bottom of the rack plate 30, a guide rod 29 matched with the inner cavity of the rack plate 30 is arranged at the end of the inner cavity of the cavity 32 away from the connecting pipe 12, and the rack plate 30 is movably sleeved on the outside of the guide rod 29, the arrangement of the guide rod 29 can guide the rack plate 30 and block the airflow, so that the hot gas can quickly enter the air inlet hole 33, a sleeve 28 is rotatably arranged at the top end of the preheating frame 6, an adjusting gear 17 engaged with the rack plate 30 is mounted on the outside of the sleeve 28, a pore diameter adjusting shaft 7 corresponding to the sleeve 28 is mounted on one side of the heat treatment temperature insulation box 2, the sleeve 28 is movably sleeved on the outside of the pore diameter adjusting shaft 7, a spiral guide groove 9 is arranged on the outer wall of the pore diameter adjusting shaft 7, a guide block 27 movably matched with the guide groove 9 is arranged on the inner wall of the sleeve 28, and the guide block 27 is semispherical.

[0040] In order to realize the displacement of the waste heat recovery frame 5 and the preheating frame 6, a driving mechanism is arranged on the frame 1, the driving mechanism comprises mounting sliding grooves 8 arranged on both sides of the top of the frame 1, movable sliding plates 10 are arranged on the inner sides of the mounting sliding grooves 8, in order to increase stability, linear guides can be arranged in the mounting sliding grooves 8, the movable sliding plates 10 are movably arranged on the linear guides, the lower ends of the waste heat recovery frame 5 and the preheating frame 6 extend to the inner sides of the mounting sliding grooves 8 and are fixedly connected with the side edges of the movable sliding plates 10, a rack 13 is arranged on one side of the movable sliding plate 10, driven gears 21 are rotatably arranged in the inner sides of the side walls of one end of the mounting sliding groove 8 and are engaged with the rack 13, one driving gear 22 is engaged with one side of each of the two driven gears 21, and the two driving gears 22 are engaged with each other, the frame 1 is provided with a driving source 11 for driving one of the driving gears 22 to rotate, the driving source 11 is preferably a speed reducer motor, when the driving source 11 drives one of the driving gears 22 to rotate, the driving gear 22 can drive the other driving gear 22 and one of the driven gears 21 to rotate, the driving gear 22 driven to rotate can drive the other driven gear 21 to rotate, so that the two driven gears 21 can drive the two movable sliding plates 10 to synchronously and synchronously displace.

[0041] In addition, as shown in Figures 7-9 In order to facilitate the non-contact passing of the recovery ring 19, the preheating ring 20 and the weld, two conveying rollers 3 are arranged on the rotating shaft 34, and the two conveying rollers 3 are movably connected with the rotating shaft 34, the ends close to each other of the two conveying rollers 3 on the same rotating shaft 34 are provided with arc-shaped recesses along the circumferential direction of the conveying roller 3, and the arc-shaped recesses are matched with the steel pipe, and the conveying roller 3 is provided below the conveying roller 3 with an avoiding assembly for driving the conveying roller 3 to displace along the axis of the rotating shaft 34, as a preferred embodiment, the avoiding assembly comprises a traction frame 23 movably arranged on the top of the frame 1, specifically, the top of the frame 1 is provided with a linear guide corresponding to the traction frame 23, the bottom of the traction frame 23 is movably connected with the linear guide, and the moving direction is parallel to the axis of the rotating shaft 34, the end of the traction frame 23 is rotatably connected with the end of the conveying roller 3, one side of the traction frame 23 is provided with a guide wheel 24 corresponding to the movable sliding plate 10, the top of the movable sliding plate 10 is provided with a straight groove 15, the two ends of the straight groove 15 are respectively provided with isosceles trapezoidal convex grooves 16, the guide wheel 24 is used for movably guiding the straight groove 15 and the convex groove 16, the guide wheel 24 is rotatably connected with the traction frame 23, which can reduce friction loss, and the straight groove 15, the convex groove 16 and the guide wheel 24 are configured as follows: when the guide wheel 24 is located in the inner side of the straight groove 15, the conveying roller 3 is in a corresponding state with the recovery ring 19 and the preheating ring 20, when the guide wheel 24 is located at the end of the convex groove 16 away from the straight groove 15, the conveying roller 3 is in a staggered state with the recovery ring 19 and the preheating ring 20, before the recovery ring 19 and the preheating ring 20 reach the corresponding conveying roller 3, the conveying roller 3 can displace along the axis of the rotating shaft 34 to avoid the recovery ring 19 and the preheating ring 20, after the recovery ring 19 and the preheating ring 20 pass through the conveying roller 3, the conveying roller 3.

[0042] Working principle: in use, the steel pipe to be treated is placed on the conveying roller 3 upstream of the rack 1, one end of which passes through the preheating ring 20, supported by the conveying roller 3, the control driving device rotates the plurality of conveying rollers 3, thereby driving the steel pipe to move forward until the weld of the steel pipe corresponds to the heating device 14, the steel pipe can continue to be loaded during heat treatment, after heat treatment, the conveying roller 3 continues to rotate, when the weld of the steel pipe to be treated coincides with the preheating ring 20, the weld after heat treatment coincides with the recovery ring 19, at this time, the driving source 11 and the air blower 18 are started, wherein the driving source 11 drives the driving gear 22 to rotate, the driving gear 22 drives the driven gear 21 to rotate, the driven gear 21 drives the moving slide plate 10 to displace in the installation sliding groove 8 through the rack 13, the waste heat recovery frame 5 and the preheating frame 6 follow the synchronous displacement, then the guide wheel 24 gradually enters the convex groove 16, and then the guide wheel 24 drives the conveying roller 3 to displace on the rotating shaft 34 through the traction frame 23, thereby the conveying rollers 3 at both ends are staggered with the recovery ring 19 and the preheating ring 20, during which the air blower 18 absorbs the heat of the heat treatment part through the suction hole 25, and then enters the cavity 32 through the connecting pipe 12, then enters the rack plate 30, and finally is blown out from the blowing hole 26 to the weld to be treated for preheating after passing through the gradual change groove 31 and the air inlet hole 33, and with the displacement of the sleeve 28 driven by the preheating frame 6, the sleeve 28 drives the adjusting gear 17 to gradually rotate under the action of the guide block 27 and the guide groove 9, the adjusting gear 17 drives the rack plate 30 to gradually displace, thereby the relative positions of the gradual change groove 31 and the air inlet hole 33 gradually change, the hole diameter of the position where the gradual change groove 31 coincides with the air inlet hole 33 becomes larger and larger, thereby increasing the air volume, realizing gradient preheating and temperature rising, at the same time, during the overall displacement of the moving slide plate 10, the waste heat recovery frame 5 and the preheating frame 6, before the guide wheel 24 is separated from the convex groove 16 and returns to the straight groove 15 again, the recovery ring 19 and the preheating ring 20 will pass through the conveying roller 3 together with the weld, pass through the rear guide wheel 24 to return to the straight groove 15, and the conveying roller 3 is reset, which is convenient for supporting the subsequent pipe section, before the recovery ring 19 and the preheating ring 20 together with the weld reach the next conveying roller 3 again, the corresponding guide wheel 24 also enters the convex groove 16, thereby pushing away the conveying roller 3, so as to avoid and reset, which can not only facilitate the passing of the recovery ring 19 and the preheating ring 20, but also prevent the weld after heat treatment from contacting the conveying roller 3, when the waste heat recovery frame 5, the preheating frame 6 and the moving slide plate 10 displace to the limit distance, the driving source 11 stops, the conveying roller 3 continues to displace, the conveying roller 3 conveys the weld part of the steel pipe to be treated to the heating device 14, and the treated steel pipe continues to move forward for a distance for cooling, then the driving source 11 controls the driving gear 22 to reverse, the moving slide plate 10 is gradually reset through the rack 13, one steel pipe is supported by a plurality of conveying rollers 3, therefore, when a group of conveying rollers 3 is pushed away and reset, it will not affect the stability of the steel pipe.

[0043] The technical scope of the present application is not limited to the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should all belong to the protection scope of the present application.

Claims

1. A heat treatment device for weld seams of high-temperature resistant steel pipes, characterized in that, It includes a frame, a heat treatment insulation box mounted on the frame, a heating device mounted in the heat treatment insulation box, and a conveying roller mounted on the frame; A waste heat recovery mechanism is provided at one end of the frame. The waste heat recovery mechanism includes a waste heat recovery frame that is movably set at one end of the frame. A hollow recovery ring is provided at the upper end of the waste heat recovery frame. Suction holes are provided on the inner wall of the recovery ring. A blower is provided on the waste heat recovery frame. The air inlet of the blower is connected to the recovery ring. A preheating mechanism is provided at one end of the frame. The preheating mechanism includes a preheating frame movably mounted at the end of the frame furthest from the waste heat recovery mechanism. A hollow preheating ring is provided at the upper end of the preheating frame, and blowing holes are provided on the inner wall of the preheating ring. A cavity is provided on the inner side of the upper end of the preheating frame, and a hollow rack plate is movably mounted inside the cavity. A connecting pipe is provided at one end between the waste heat recovery frame and the preheating frame. One end of the connecting pipe is connected to the air outlet of the blower, and the other end is connected to the cavity. An air inlet communicating with the preheating ring is provided at one end of the cavity. The bottom of the rack plate is provided with… It has a tapered, gradually changing groove corresponding to the air inlet. A sleeve is rotatably installed at the top of the preheating rack. An adjusting gear that meshes with a rack plate is installed on the outside of the sleeve. An aperture adjusting shaft corresponding to the sleeve is installed on one side of the heat treatment insulation box. The sleeve is movably sleeved on the outside of the aperture adjusting shaft. A spiral guide groove is provided on the outer wall of the aperture adjusting shaft. A guide block that movably cooperates with the guide groove is provided on the inner wall of the sleeve. An installation slide is provided at the top of the frame. A movable sliding plate for moving the waste heat recovery rack and the preheating rack is movably installed in the installation slide.

2. The heat treatment device for high-temperature resistant steel pipe welds according to claim 1, characterized in that: The frame is equipped with a drive mechanism for driving the displacement of the moving slide plate. The drive mechanism includes a rack on one side of the moving slide plate, a driven gear that meshes with the rack is rotatably disposed on the inner side of the side wall at one end of the mounting groove, a driving gear is meshed on one side of the driven gear, and a drive source for driving the rotation of the driving gear is provided on the frame.

3. The heat treatment device for high-temperature resistant steel pipe welds according to claim 1, characterized in that: The cavity is provided with a guide rod at the end away from the connecting pipe, which is adapted to the inner cavity of the rack plate, and the rack plate is movably sleeved on the outside of the guide rod.

4. The heat treatment device for high-temperature resistant steel pipe welds according to claim 1, characterized in that: The upper end of the frame is equipped with brackets on both sides, and a rotating shaft is rotatably arranged between the two brackets. The conveying roller is movably connected to the outside of both ends of the rotating shaft.

5. The heat treatment device for high-temperature resistant steel pipe welds according to claim 4, characterized in that: Below the conveying roller is a clearance assembly for driving the conveying roller to move axially along the shaft. The clearance assembly includes a traction frame movably mounted on the top of the frame. The upper end of the traction frame is rotatably connected to the end of the conveying roller. A guide wheel corresponding to the movable slide plate is provided on one side of the traction frame. A straight groove is provided on the top of the movable slide plate. An isosceles trapezoidal protrusion is provided at both ends of the straight groove. The guide wheel is used to movably guide and cooperate with the straight groove and the protrusion.

6. The heat treatment device for high-temperature resistant steel pipe welds according to claim 5, characterized in that: The straight groove, the convex groove, and the guide wheel are configured such that when the guide wheel is located inside the straight groove, the conveying roller is in a corresponding state with the recovery ring and the preheating ring; when the guide wheel is located at the end of the convex groove away from the straight groove, the conveying roller is in a staggered state with the recovery ring and the preheating ring.

7. The heat treatment device for high-temperature resistant steel pipe welds according to claim 4, characterized in that: Two conveying rollers on the same rotating shaft have an arc-shaped recess along their circumference at their closest ends, and the arc-shaped recess is adapted to the steel pipe.

8. The heat treatment device for high-temperature resistant steel pipe welds according to claim 6, characterized in that: The guide wheel is rotatably mounted on one side of the traction frame.

9. The heat treatment device for high-temperature resistant steel pipe welds according to claim 1, characterized in that: The conveying roller and the rotating shaft are connected by a key.

10. The heat treatment device for high-temperature resistant steel pipe welds according to claim 9, characterized in that: The top of the frame is provided with a linear guide rail corresponding to the traction frame, and the bottom of the traction frame is movably connected to the linear guide rail, with the direction of movement parallel to the axis of rotation.

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