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CN-121992186-A - Heat treatment device and method for large pressure vessel connecting pipe welded joint

CN121992186ACN 121992186 ACN121992186 ACN 121992186ACN-121992186-A

Abstract

The invention provides a heat treatment device and a heat treatment method for a large-scale pressure vessel connecting pipe welded joint, wherein the heat treatment device comprises an external burner clamping mechanism, a clamp mechanism, an internal burner clamping mechanism, an external infrared burner, an internal infrared burner and a gas supply device; the invention adopts a gas infrared radiation heating mode to realize the accurate local heating of the butt-joint pipe welding joint. The invention can adapt to the change of the inner diameter of the connecting pipe in a certain range through the clamp mechanism and the burner clamping mechanism. The burner is uniformly distributed along the radial direction of the circumference, is tightly attached to the welding seam area, combines the characteristics of high energy density and quick response of the infrared radiation of the fuel gas, is favorable for ensuring uniform distribution of a temperature field, realizes precise regulation and control of a microstructure of the welding seam, avoids performance degradation of a non-heating area caused by heating, and improves welding quality and reliability. According to the invention, the internal burner clamping mechanism and the clamp mechanism are in rotary lap joint through the internal positioning sleeve and the guide sleeve, so that the quick connection is realized, and the production efficiency is improved.

Inventors

  • CHEN SHUGUANG
  • WANG JINGKAI
  • WU CHAO
  • WANG TIANRUI

Assignees

  • 江苏科技大学
  • 中国机械总院集团宁波智能机床研究院有限公司

Dates

Publication Date
20260508
Application Date
20260331

Claims (10)

  1. 1. A heat treatment device for a welded joint of a large pressure vessel connection pipe is characterized by comprising an external burner clamp The device comprises a holding mechanism (2), a clamp mechanism (3), an internal burner clamping mechanism (4), an external infrared burner (2-3), an internal infrared burner (4-2) and a fuel gas supply device; The clamp mechanism (3) comprises a telescopic support column (3-3), a transmission assembly for driving the support column (3-3) to stretch and retract and a gas channel (3-2), wherein the support column (3-3) is used for being in tensioning fit with the inner wall of the connecting pipe; The infrared burner comprises an outer burner clamping mechanism (2), an inner burner clamping mechanism (4), a plurality of first burner positioning holes (2-1), a plurality of second burner positioning holes, a plurality of connecting pipes, a plurality of first burner positioning holes, a plurality of second burner positioning holes, a plurality of connecting pipes, a plurality of second burner positioning holes, a plurality of infrared burner positioning holes, a plurality of first burner positioning holes (2-1) and a plurality of second burner positioning holes, wherein the outer burner positioning holes (2-3) are arranged in the upper end of the clamping mechanism (3) in a circumferential direction, the plurality of first burner positioning holes (2-1) are uniformly distributed along the radial direction, and the connecting pipes respectively correspond to different diameter specifications; The gas supply device is connected with a gas channel (3-2) of the clamp mechanism (3) and is used for supplying gas to the external infrared burner (2-3) and the internal infrared burner (4-2) through the gas channel (3-2).
  2. 2. The heat treatment device for a welded joint of a large pressure vessel pipe according to claim 1, wherein the transmission assembly of the clamp mechanism (3) comprises a positioning disc (3-1), a support column (3-3), a connecting rod (3-4), a clamp cylinder (3-5), a guide block (3-6), a positioning block (3-7) and a guide sleeve (3-8); The positioning disc (3-1) is used for being in contact with the end face of the connecting pipe, the gas channel (3-2) penetrates through the guide sleeve (3-8), the upper end of the gas channel (3-2) is connected with the gas supply device, the lower end of the gas channel is connected with the internal burner clamping mechanism (4), the wall surface of the clamp cylinder body (3-5) is provided with symmetrically arranged sliding grooves, the guide sleeve (3-8) is slidably arranged in the clamp cylinder body (3-5) and is in sliding fit with the sliding grooves, guide blocks (3-6) are respectively arranged on two side wall surfaces of the guide sleeve (3-8), the guide blocks (3-6) extend outwards through the sliding grooves and move together with the guide sleeve (3-8), one end of the connecting rod (3-4) is hinged with the guide blocks (3-6), the supporting column (3-3) is hinged with the other end of the connecting rod (3-4), and the positioning block (3-7) is fixedly arranged in the lower end of the clamp cylinder body (3-5) and is used for limiting the sliding travel of the guide sleeve (3-8); When the guide sleeve (3-8) slides in the clamp cylinder body (3-5), the guide block (3-6) drives the connecting rod (3-4) to move, and the connecting rod (3-4) drives the support column (3-3) to stretch and retract, so that the tensioning of the inner wall of the connecting pipe is realized.
  3. 3. Heat treatment device for large pressure vessel nipple welded joints according to claim 2, characterized in that the inner positioning sleeve (4-1) of the inner burner clamping mechanism (4) is detachably connected to the guiding sleeve (3-8) of the clamping mechanism (3) by means of a swivel joint.
  4. 4. The heat treatment device for a large pressure vessel nipple welded joint according to claim 1, characterized in that the external infrared burner (2-3) and the internal infrared burner (4-2) are both metal fiber infrared burners, the back of which is provided with a protruding cylinder containing an internally threaded hole; The cylinder at the back of the external infrared burner (2-3) is connected with the joint on which external threads are distributed on the external burner positioning cylinder (2-2) through threads, and is fixedly arranged in the first burner positioning hole (2-1) in a transition fit mode; The cylinder at the back of the internal infrared burner (4-2) is connected with the joint on which the external threads are distributed on the internal positioning sleeve (4-1) through threads, and is fixedly arranged in the second burner positioning hole in a transition fit mode.
  5. 5. The heat treatment device for large pressure vessel nipple welded joints according to claim 1, characterized in that the gas supply means comprises an upper gas diverter tray (1) and a lower gas diverter tray (5); the upper gas distribution disc (1) is connected with the external infrared burner (2-3) and is used for supplying gas to the external infrared burner (2-3) arranged in the first burner positioning hole (2-1); The lower gas flow distribution disc (5) is connected with the internal infrared burner (4-2) and is used for supplying gas to the internal infrared burner (4-2) arranged in the second burner positioning hole.
  6. 6. The heat treatment device for the large-scale pressure vessel connecting pipe welded joint according to claim 5, wherein the lower end face of the upper gas distribution plate (1) is provided with a plurality of gas outlets, the upper gas distribution plate is connected with an external infrared burner (2-3) on the external burner clamping mechanism (2) through a gas pipeline, and the upper end of the upper gas distribution plate (1) is provided with an air inlet hole, and the upper gas distribution plate is connected with a gas channel (3-2) of the clamping mechanism (3).
  7. 7. The heat treatment device for the large-scale pressure vessel connecting pipe welded joint according to claim 5, wherein the upper end face of the lower gas flow distribution disc (5) is provided with a plurality of gas outlets, the gas outlets are connected with an internal infrared burner (4-2) on the internal burner clamping mechanism (4) through a gas pipeline, and the gas inlet of the lower gas flow distribution disc (5) is externally threaded and screwed into the bottom of a gas channel (3-2) of the clamping mechanism (3).
  8. 8. The heat treatment device for large pressure vessel nipple weld joints according to claim 1, characterized in that the inner burner clamping mechanism (4) further comprises an insulation layer (4-3), a burner support plate (4-4) with positioning holes, a burner support plate mount (4-5) and a threaded sleeve (4-7); The burner support plate (4-4) with the positioning holes is provided with a plurality of second burner positioning holes along the circumferential direction, the burner support plate base (4-5) is connected below the burner support plate (4-4) with the positioning holes, the threaded sleeve (4-7) is in threaded fit with the gas channel (3-2) of the clamp mechanism (3), the upper end of the threaded sleeve (4-7) is abutted to the burner support plate base (4-5) and used for driving the burner support plate (4-4) with the positioning holes to move along the axial direction through rotation, the heat insulation layer (4-3) is arranged between the internal infrared burner (4-2) and the burner support plate (4-4) with the positioning holes, and the internal infrared burner (4-2) is connected with a gas pipeline of the lower gas flow distribution plate (5).
  9. 9. The heat treatment device for a large pressure vessel nipple welded joint according to claim 8, characterized in that a quick change joint (4-6) is provided at the gas pipe interface between the inner infrared burner (4-2) and the lower gas diverter tray (5).
  10. 10. A method of heat treating a welded joint of a large pressure vessel nipple using a heat treatment apparatus according to any one of claims 1 to 9, comprising the steps of: According to the inner diameter size of the connecting pipe, selecting a first burner positioning hole (2-1) and a second burner positioning hole at corresponding radial positions, mounting an external infrared burner (2-3) on an external burner clamping mechanism (2) through an external burner positioning cylinder (2-2), and mounting an internal infrared burner (4-2) on an internal burner clamping mechanism (4) through an internal positioning sleeve (4-1); The fixture mechanism (3) stretches into the connecting pipe, under the action of gravity of the internal burner clamping mechanism (4) and the gas supply device, the transmission assembly drives the supporting column (3-3) to be tensioned on the inner wall of the connecting pipe, and meanwhile, the external infrared burner (2-3) is attached to the upper surface of the connecting pipe; Adjusting the axial position of the internal burner clamping mechanism (4) to enable the internal infrared burner (4-2) to be attached to the lower surface of the connecting pipe; the gas is supplied to the external infrared burner (2-3) and the internal infrared burner (4-2) through the gas supply device, and the weld joint area is heated.

Description

Heat treatment device and method for large pressure vessel connecting pipe welded joint Technical Field The invention belongs to the technical field of welding processing of pressure vessels, and particularly relates to a heat treatment device and a heat treatment method for a large-scale pressure vessel connecting pipe welding joint, which are particularly suitable for accurate local heating treatment of pressure vessel connecting pipe welding joints with different diameter specifications. Background The pre-welding preheating and the post-welding heat treatment are key procedures in the pressure container connecting pipe welding process, the pre-welding preheating can realize uniform temperature distribution of workpieces, reduce cooling speed, reduce diffusion absorption of hydrogen and further reduce defects such as welding cracks, air holes and the like, the post-welding heat treatment can refine welding joint grains, eliminate residual stress, improve strength and toughness of materials and further improve reliability and durability of the welding joint, and the mechanical property and service safety of the welding joint are directly determined by the process implementation effect of the pre-welding preheating and the post-welding heat treatment. The manufacturing industry puts forward higher requirements on energy saving, consumption reduction and green high efficiency of welding heat treatment procedures, and the heat treatment mode of the existing pressure container connecting pipe welding joint still has a plurality of technical defects, and the concrete manifestation is as follows: (1) The overall heating energy consumption is high and the effect is poor. The traditional heat treatment adopts a mode that the whole pressure vessel welded by connecting pipes is pushed into a heat treatment furnace, so that a large heat treatment furnace is required to be built, equipment investment is large, a large amount of heat is absorbed by a non-heating area, the energy utilization rate is extremely low, serious energy waste and carbon emission are caused, and meanwhile, the microstructure of a material is irreversibly changed due to the heating of the non-heating area, so that the macroscopic mechanical property and the service life of the whole pressure vessel are reduced. (2) Short plates exist in the existing local heating mode. Part of the prior art realizes the local heat treatment of the connecting pipe welding joint, but electric energy is mostly used as heating energy, and the assembly and disassembly flow of the device is complex and the production efficiency is low. (3) The heat loss of the traditional heating process is large. The traditional modes of ceramic heating, flame heating, resistance heating and the like all take heat conduction as main heating modes, the heat loss is obvious, the problem of low heating efficiency exists, and the flame heating also causes serious environmental pollution and has bad construction environment. The gas infrared radiation is used as a novel heat treatment technology, has the advantages of high energy density, high heating speed and accurate local heating, has good penetrability to metal materials, can enable a welding seam to reach a target temperature quickly, and simultaneously uses gas as an energy source to accord with the development direction of clean energy sources, so that the gas infrared radiation welding heat treatment device is an important technical path for realizing green and energy saving of welding heat treatment. However, in the prior art, the heat treatment device based on the gas infrared radiation does not solve the problems of adapter tube inner diameter adaptability, quick assembly and disassembly of the device and accurate positioning, and cannot meet the industrial heat treatment requirement of a large-scale pressure vessel adapter tube welded joint. Disclosure of Invention Aiming at the technical problems, the invention provides the high-efficiency energy-saving heat treatment device and the method for the large-scale pressure vessel connecting pipe welding joint, which realize the accurate local heating of the pressure vessel connecting pipe welding joint, adapt to connecting pipes with different inner diameter specifications and simultaneously improve the energy utilization rate and the production efficiency. The present invention achieves the above technical object by the following means. A heat treatment device for a large pressure vessel connecting pipe welded joint comprises an external burner clamping mechanism, a clamp mechanism, an internal burner clamping mechanism, an external infrared burner, an internal infrared burner and a gas supply device; the clamp mechanism comprises a telescopic support column, a transmission assembly and a gas channel, wherein the transmission assembly is used for driving the support column to stretch and retract, and the support column is used for being in tensioning fit with the inner wall of t