A synchronous heat treatment device for tube sheet and cylinder welding seam of tube sheet of shell-and-tube heat exchanger

Abstract

The utility model belongs to the field of pipe shell type heat exchanger pipe head pipe plate and cylinder welding ring gap heat treatment technology, the utility model discloses a kind of synchronous heat treatment device of pipe shell type heat exchanger pipe head pipe plate and cylinder welding ring gap, center ring plate and intermediate connecting ring plate are concentrically arranged;The inner side end of support strip is fixed on the bottom surface of center ring plate by bolt nut, the middle position of support strip is fixed with the bottom surface of intermediate connecting ring plate by bolt nut, the outer side end of support strip extends to the outside of outer arc ring plate one and outer arc ring plate two;Inner pressure strip is arranged in the inside of outer arc ring plate one and outer arc ring plate two;Outer pressure strip is arranged in the outside of outer arc ring plate one and outer arc ring plate two.The utility model has beneficial effects: realize the synchronous stress relief heat treatment of pipe shell type heat exchanger pipe head, pipe plate and cylinder ring gap, improve the stress relief heat treatment efficiency of pipe shell type heat exchanger, reduce stress relief heat treatment cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat treatment of weld seams between tube head tube sheet and shell body in shell-and-tube heat exchangers, specifically relating to a synchronous heat treatment device for weld seams between tube head tube sheet and shell body in shell-and-tube heat exchangers. Background Technology

[0002] Shell-and-tube heat exchangers are the "heat hubs" of modern chemical and energy systems, and their performance directly affects production efficiency, energy consumption, and safety. In the manufacturing process of shell-and-tube heat exchangers, the connection between the shell and tube sheet, and between the heat exchange tubes and tube sheet, is fixed by welding. The welded joints form circumferential welds. The tube heads (i.e., the connection points between the tube sheet and heat exchange tubes) and the welded joints between the shell and tube sheet are the core and critical structures of the shell-and-tube heat exchanger, and their welding performance directly determines the reliability, safety, and service life of the equipment.

[0003] In some special operating conditions, equipment requires heat treatment. If the welds between the shell and tube sheet, and between the heat exchange tubes and tube sheet, are not subjected to stress-relieving heat treatment or are improperly treated, the welds will have significant welding stress. This directly reduces the welding performance between the shell and tube sheet, and between the heat exchange tubes and tube sheet, thereby reducing the reliability, safety, and service life of the shell-and-tube heat exchanger. Specifically, this manifests as leaks, cracks, or corrosion failures at the welds of the shell-and-tube heat exchanger, and may even lead to safety accidents.

[0004] Currently, during the manufacturing process of shell-and-tube heat exchangers, according to design and relevant technical specifications, the welds between the tube sheet and the shell, and between the tube sheet and the heat exchange tubes (i.e., the tube heads), cannot be subjected to overall heat treatment due to equipment structural factors. Instead, localized heat treatment is required (i.e., separate heat treatment of the tube sheet / shell welds and the tube sheet / heat exchange tube welds to eliminate stress at the weld joints). This results in a long and costly stress-relieving heat treatment process for shell-and-tube heat exchanger welds. To address the technical problems existing in the stress-relieving heat treatment of shell-and-tube heat exchanger welds, the inventors have developed a device for simultaneous heat treatment of the tube head, tube sheet, and shell welds in shell-and-tube heat exchangers. This device effectively solves the existing technical problems, enabling simultaneous heat treatment of the tube head, tube sheet, and shell welds in shell-and-tube heat exchangers. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a synchronous heat treatment device for the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger. This utility model is scientifically and rationally designed and has a simple structure. It can solve the technical problem in the prior art that the weld between the tube sheet and the shell and the weld between the tube sheet and the heat exchange tube of a shell-and-tube heat exchanger cannot be subjected to stress-relieving heat treatment as a whole and synchronously.

[0006] The technical solution adopted in this utility model is as follows: a synchronous heat treatment device for the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger, comprising a central ring plate, an intermediate connecting ring plate, and support strips. The central ring plate and the intermediate connecting ring plate are concentrically arranged, and the outer diameter of the central ring plate is smaller than that of the intermediate connecting ring plate. Four to eight support strips are arranged around the central ring plate and the intermediate connecting ring plate. The inner end of the support strip is fixed to the bottom surface of the central ring plate by bolts and nuts, and the middle position of the support strip is fixed to the bottom surface of the intermediate connecting ring plate by bolts and nuts. The outer end of the support strip extends to the outside of the first and second outer arc-shaped ring plates. An inner pressure strip is arranged inside the first and second outer arc-shaped ring plates. The inner pressure strip includes an inner pressure strip body, which is Z-shaped. A first bending surface is located at the upper part of the inner pressure strip body, and a second bending surface is located at the lower part of the inner pressure strip body. The device is configured such that a slot one is formed on the bending surface two, and the slot one is strip-shaped; a large through hole is formed on the outer side of the bending surface one, and a small through hole is formed on the inner side of the large through hole, with the large and small through holes arranged radially linearly; an outer pressure strip is set on the outer side of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two, and the outer pressure strip includes an outer pressure strip body, which is Z-shaped, with bending surface A set on the upper part of the outer pressure strip body, and bending surface B set on the outer pressure strip body. At the lower part of the body, slot two is opened in the middle of the bent surface B, and slot two is strip-shaped; through hole is opened in the middle of the upper part of the bent surface A, and clamping bolt and clamping nut are installed in the through hole; outer arc-shaped ring plate one and outer arc-shaped ring plate two are semi-circular, and the inner sides of outer arc-shaped ring plate one and outer arc-shaped ring plate two overlap to form a cylinder. The rear end face of outer arc-shaped ring plate one and outer arc-shaped ring plate two is fixed to the front side of the support strip plate by pins or spot welding.

[0007] The outer diameter of the central ring plate is smaller than the diameter of the cylinder, and the outer diameter of the intermediate connecting ring plate is larger than the diameter of the cylinder but smaller than the diameter of the tube sheet.

[0008] The support strip includes a support strip body, which is strip-shaped. A strip groove is formed in the middle of the support strip body and extends through the support strip body. Bolts pass through the inner end of the strip groove and the central ring plate and are tightened and fixed by nuts. Bolts also pass through the middle of the strip groove and the middle connecting ring plate and are tightened and fixed by nuts.

[0009] The inner pressure strip body and the outer pressure strip body are fixedly mounted on the support strip body at circumferential intervals around the central ring plate and the intermediate connecting ring plate; the slot one of the inner pressure strip body corresponds to the front and back of the strip groove, and is fixed to the inner side of the outer arc ring plate one and the outer arc ring plate two by bolts passing through the slot one and the strip groove and tightening with nuts; the slot two of the outer pressure strip body corresponds to the front and back of the strip groove, and is fixed to the outer side of the outer arc ring plate one and the outer arc ring plate two by bolts passing through the slot two and the strip groove and tightening with nuts.

[0010] The first and second bending surfaces are parallel to the surfaces of the central ring plate and the intermediate connecting ring plate. The first bending surface faces the front side of the central ring plate and the intermediate connecting ring plate, and the rear side of the second bending surface is in contact with the front side of the support strip plate body.

[0011] The bending surfaces A and B are parallel to the surfaces of the central ring plate and the intermediate connecting ring plate. The bending surface A faces the front side of the central ring plate and the intermediate connecting ring plate, and the rear side of the bending surface B is in contact with the front side of the support strip plate body.

[0012] The height of the outer pressure plate body is greater than the height of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two.

[0013] The outer arc-shaped ring plate one and the outer arc-shaped ring plate two are made of elastic steel plate, and the overlapping surfaces of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two are fixedly connected by spot welding; the diameter of the cylindrical shape formed by the outer arc-shaped ring plate one and the outer arc-shaped ring plate two is equal to the circumferential diameter of the tube sheet.

[0014] The process of using this synchronous heat treatment device for the tube head tube sheet and shell weld of the shell-and-tube heat exchanger is as follows: Before the synchronous heat treatment device is assembled and installed, the shell is supported by symmetrically arranged supports.

[0015] I. Assembly and Installation of the Synchronous Heat Treatment Unit: First, align the grooves of the support plates with the rear side of the central ring plate. Insert bolts through the grooves and the central ring plate, and tighten with nuts to secure the support plates to the central ring plate. The eight support plates are installed at equal angles around the central ring plate. Next, align the rear side of the intermediate connecting ring plate with the front sides of all the support plates. Insert bolts through the grooves and the intermediate connecting ring plate, and tighten with nuts to secure the intermediate connecting ring plate to all the support plates. Finally, assemble the outer arc-shaped ring plate one and outer arc-shaped ring plate two into a cylindrical shape, ensuring the diameter of the cylinder formed by the combined outer arc-shaped ring plate one and outer arc-shaped ring plate two is equal to the diameter of the tube sheet. Then, fix them with pins or spot welding; then align the first slot on the second bent surface of the inner pressure plate with the strip groove of the support plate, and use bolts to pass through the first slot on the second bent surface and the strip groove of the support plate, and tighten them with nuts. The inner pressure plate is fixed to the support plate at intervals, and the rear sides of the first and second outer arc ring plates are fixed to the front side of the second bent surface of the inner pressure plate with pins or spot welding; finally, align the second slot on the second bent surface of the outer pressure plate with the outer end strip groove of the support plate, and use bolts to pass through the second slot on the second bent surface of the outer surface and the strip groove of the support plate, and tighten them with nuts. The outer pressure plate is fixed to the outer end of the support plate at intervals, and the outer pressure plate is located on the outer side of the first and second outer arc ring plates.

[0016] II. Stress-relieving heat treatment of the weld between the tube head / tube sheet and the shell: The weld at the connection between the shell and the tube sheet is... Figure 1The weld seam shown is weld seam one, and the weld seam at the connection between the heat exchange tube and the shell is weld seam two, as shown in the figure. First, a heating belt is laid on the right end face of the shell-and-tube heat exchanger, and a layer of insulation cotton is laid on the heating belt. Then, the synchronous heat treatment device is fitted onto the right end face of the shell-and-tube heat exchanger, ensuring that the end faces of the heat exchange tube and the shell are in close contact with the front sides of the central ring plate and the intermediate connecting ring plate. Bolts and nuts are installed in a large through hole on the bent surface of the inner pressure strip plate, and the heating belt and insulation cotton are pressed tightly by adjusting the bolts and nuts. Simultaneously, thin steel wires are threaded through the small through holes to securely fix the heating belt. Finally, on the right end of the shell-and-tube heat exchanger… A heating rope is wrapped around weld seam one, and a layer of insulation cotton is also wrapped around the heating rope, with the width of the insulation cotton extending 30-40 cm towards the middle of the cylinder. At this point, the heating rope and insulation cotton wrapped around weld seam one are secured by tightening or loosening the clamping bolts and nuts in the through holes on the bending surface A of the outer pressure strip. Finally, weld seam two is heated at high temperature using a heating belt, while weld seam one is heated at high temperature using the heating rope, thus achieving stress-relieving heating treatment for weld seams one and two. After the stress-relieving heating treatment of weld seams one and two on the right end of the shell-and-tube heat exchanger is completed, the above steps are repeated for the stress-relieving heating treatment of weld seams one and two on the left end of the shell-and-tube heat exchanger.

[0017] The beneficial effects of this utility model are as follows: 1. It realizes the synchronous stress relief heat treatment of the tube head, tube sheet and shell circumferential seam (weld seam one and weld seam two) of the shell-and-tube heat exchanger, so that the tube head in each area of ​​the tube sheet is heated evenly and the heat preservation temperature can meet the design requirements; 2. It improves the stress relief heat treatment efficiency of the shell-and-tube heat exchanger and reduces the stress relief heat treatment cost. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the shell, tube sheet, and heat exchange tubes of a shell-and-tube heat exchanger in the prior art.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3 This utility model Figure 2 A schematic diagram of the structure in the rear-view direction;

[0021] Figure 1 Markings: 1. Shell, 2. Tube sheet, 3. Heat exchange tube, 4. Weld 1, 5. Weld 2.

[0022] Figure 2 and Figure 3Markings: 1. Central ring plate, 2. Intermediate connecting ring plate, 3. Support strip plate, 31. Support strip plate body, 32. Strip groove, 4. Inner pressure strip plate, 41. Inner pressure strip plate body, 42. Bending surface one, 43. Bending surface two, 44. Slot hole one, 45. Large through hole, 46. Small through hole, 5. Outer pressure strip plate, 51. Outer pressure strip plate body, 52. Bending surface A, 53. Bending surface B, 54. Slot hole two, 55. Through hole, 56. Clamping bolt, 57. Clamping nut, 6. Outer arc ring plate one, 7. Outer arc ring plate two. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] This utility model provides a device for simultaneous heat treatment of the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger:

[0025] like Figure 2 As shown in Figure 3, the central ring plate 1 and the intermediate connecting ring plate 2 are arranged concentrically, and the outer diameter of the central ring plate 1 is smaller than the outer diameter of the intermediate connecting ring plate 2; four to eight support strips 3 are arranged around the central ring plate 1 and the intermediate connecting ring plate 2 in the circumference. The inner end of the support strip 3 is fixed to the bottom surface of the central ring plate 1 by bolts and nuts, and the middle position of the support strip 3 is fixed to the bottom surface of the intermediate connecting ring plate 2 by bolts and nuts.

[0026] The above-mentioned arrangement of the central ring plate 1, the intermediate connecting ring plate 2, and the support strip plate 3 forms a stable structure for fixing the inner pressure strip plate 4 and the outer pressure strip plate 5; on the other hand, it limits and fixes the heating strip laid on the second weld 5 (i.e., the end of the heat exchange tube 3); and furthermore, it provides a fixed connection for the rear end faces of the outer arc-shaped ring plate 6 and the outer arc-shaped ring plate 7.

[0027] like Figure 2 As shown in Figure 3, the inner pressure strip 4 is disposed inside the outer arc-shaped ring plate 6 and the outer arc-shaped ring plate 7. The inner pressure strip 4 includes an inner pressure strip body 41, which is Z-shaped. A bending surface 42 is disposed at the upper part of the inner pressure strip body 41, and a bending surface 43 is disposed at the lower part of the inner pressure strip body 41. A slot 44 is formed on the bending surface 43 and is strip-shaped. A large through hole 45 is formed on the outer side of the bending surface 42, and a small through hole 46 is formed on the inner side of the large through hole 45. The large through hole 45 and the small through hole 46 are arranged radially linearly.

[0028] The inner pressure plate 4, the bending surface 2 43, and the slot 1 44 are set up. The slot 1 44 on the bending surface 2 43 is aligned with the strip groove 32 on the support plate body 31. The bending surface 2 43 is in contact with the front side of the support plate body 31. Under the condition that the bolt and nut are tightened by passing through the upper slot 1 44 and the strip groove 32, the inner pressure plate 4 is fixed on the support plate body 31.

[0029] The aforementioned design, using the large through-hole 45 and small through-hole 46 on the inner pressure plate 4 and the bending surface 42, serves two purposes. First, bolts and nuts are installed in the large through-hole 45, and the heating band and insulation cotton on weld 2 5 are pressed tightly by adjusting the bolts and nuts. Second, thin steel wires are threaded through the small through-hole 46 to securely fix the heating band, preventing the heating band and insulation cotton on weld 2 5 from loosening and affecting the stress-relieving heat treatment effect at weld 2 5.

[0030] like Figure 2 As shown in Figure 3, the outer pressure strip 5 is disposed on the outside of the outer arc-shaped ring plate 6 and the outer arc-shaped ring plate 7. The outer pressure strip 5 includes an outer pressure strip body 51, which is Z-shaped. The bending surface A52 is disposed on the upper part of the outer pressure strip body 51, and the bending surface B53 is disposed on the lower part of the outer pressure strip body 51. The second slot 54 is opened in the middle of the bending surface B53 and is strip-shaped. The through hole 55 is opened in the upper middle part of the bending surface A, and the clamping bolt 56 and the clamping nut 57 are fitted into the through hole 55.

[0031] The aforementioned outer pressure plate 5, bending surface B53, and slot 54 are designed to align the slot 54 on the bending surface B53 with the outer end slot 32 of the support plate 3. Bolts are passed through the slot 54 on the bending surface B53 and the outer end slot 32 of the support plate 3, and nuts are tightened to fix the outer pressure plate 5 onto the support plate 3, thereby providing a stable and secure fixation for the outer pressure plate 5.

[0032] The above-mentioned setting of outer pressure plate 5, bending surface A52, through hole 55, clamping bolt 56 and clamping nut 57, and by tightening or loosening the clamping bolt 56 and clamping nut 57 in the through hole 55 on the bending surface A52 of outer pressure plate 5, can achieve the clamping and fixing of the heating rope wrapped on weld seam 4 and the insulation cotton wrapped around it.

[0033] like Figure 2 As shown in Figure 3, the outer arc-shaped ring plate 1 6 and the outer arc-shaped ring plate 2 7 are semi-circular in shape. The inner sides of the outer arc-shaped ring plate 1 6 and the outer arc-shaped ring plate 2 7 overlap to form a cylindrical shape. The rear end faces of the outer arc-shaped ring plate 1 6 and the outer arc-shaped ring plate 2 7 are fixed to the front side of the support strip plate 3 by pins or spot welding.

[0034] The main purpose of this arrangement is twofold: First, by adjusting the length of the overlap between the outer arc-shaped ring plate 6 and the outer arc-shaped ring plate 7, the diameter of the cylindrical structure formed by them can be adjusted, thus adapting to different diameters of the tube sheet 2 and the cylinder 1, and achieving integral stress-relieving heat treatment of weld seam 4 and weld seam 5 in the shell-and-tube heat exchanger. Second, the insulation cotton covering weld seam 4 and weld seam 5 can be fixed and limited, preventing rapid temperature loss, thereby improving the technical effect of stress-relieving heat treatment of weld seam 4 and weld seam 5.

[0035] like Figure 1-3 As shown, the heating rope and heating belt described in this utility model belong to the scope of the prior art, which should be known by those skilled in the art. Therefore, there is no need to elaborate on the specific structure, working principle and usage of the heating rope and heating belt.

[0036] like Figure 1-3 As shown, the process of using this synchronous heat treatment device for the tube head tube sheet and shell weld of the shell-and-tube heat exchanger is as follows: Before the synchronous heat treatment device is assembled and installed, the shell 1 is supported by symmetrically arranged supports. I. Assembly and Installation of the Synchronous Heat Treatment Device: First, align the groove 32 of the support plate 3 with the rear side of the central ring plate 1. Use bolts to pass through the groove 32 of the support plate 3 and the central ring plate 1, and tighten with nuts to secure the support plate 3 to the central ring plate 1. The eight support plates 3 are fixedly installed at equal angles around the central ring plate 1. Next, align the rear side of the intermediate connecting ring plate 2 with the front side of all the support plates 3. Use bolts to pass through the groove 32 of the support plate 3 and the intermediate connecting ring plate 2, and tighten with nuts to secure the intermediate connecting ring plate 2 to all the support plates 3. Then, assemble the outer arc-shaped ring plate 1 6 and the outer arc-shaped ring plate 2 7 into a cylindrical shape, ensuring the diameter of the cylindrical shape is equal to the diameter of the tube plate 2. Secure with pins or spot welding. Then, align the first slot 44 on the second bending surface 43 of the inner pressure plate 4 with the strip groove 32 of the support plate 3, and use bolts to pass through the first slot 44 on the second bending surface 43 and the strip groove 32 of the support plate 3, and tighten them with nuts. The inner pressure plate 4 is fixed to the support plate 3 at intervals, and the rear sides of the first outer arc ring plate 6 and the second outer arc ring plate 7 are fixed to the front side of the second bending surface 43 of the inner pressure plate 4 with pins or spot welding. Finally, align the second slot 54 on the second bending surface B53 of the outer pressure plate 5 with the outer end strip groove 32 of the support plate 3, and use bolts to pass through the second slot 54 on the second bending surface B53 and the outer end strip groove 32 of the support plate 3, and tighten them with nuts. The outer pressure plate 5 is fixed to the outer end of the support plate 3 at intervals, and the outer pressure plate 5 is located on the outer circumference of the first outer arc ring plate 6 and the second outer arc ring plate 7.

[0037] II. Stress-relieving heat treatment of the weld between the tube head / tube sheet and the cylinder: The weld at the connection between cylinder 1 and tube sheet 2 is... Figure 1 As shown in weld 4, the weld at the connection between heat exchange tube 3 and cylinder 1 is as follows. Figure 1 The weld seam 2.5 is shown. First, a heating belt is laid on the right end face of the shell-and-tube heat exchanger, and a layer of insulation cotton is laid on the heating belt. Then, the synchronous heat treatment device is fitted onto the right end face of the shell-and-tube heat exchanger, so that the end faces of the heat exchange tube 3 and the cylinder 1 are in close contact with the front side of the central ring plate 1 and the intermediate connecting ring plate 2. Bolts and nuts are installed on the large through hole 45 of the bending surface 42 of the inner pressure strip plate 4, and the heating belt and insulation cotton are pressed tightly by adjusting the bolts and nuts. At the same time, a thin steel wire is threaded through the small through hole 46 to fix the heating belt firmly. Finally, the weld seam 2.5 on the right end of the shell-and-tube heat exchanger is installed. A heating rope is wrapped around weld seam 4, and a layer of insulation cotton is also wrapped around the heating rope, with the width of the insulation cotton extending 15-30 cm towards the middle of the cylinder 1. At this time, the heating rope wrapped around weld seam 4 and the insulation cotton wrapped around it are pressed and fixed by tightening or loosening the clamping bolts 56 and clamping nuts 57 in the through holes 55 on the bending surface A52 of the outer pressure plate 5. Finally, weld seam 2 is heated at high temperature using a heating belt, and weld seam 4 is heated at high temperature using the heating rope, thereby achieving stress relief heating treatment for weld seam 4 and weld seam 2. After the stress relief heating treatment of weld seam 4 and weld seam 2.5 on the right end of the shell-and-tube heat exchanger is completed, the above steps are repeated for stress relief heating treatment of weld seam 4 and weld seam 2.5 on the left end of the shell-and-tube heat exchanger.

[0038] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A synchronous heat treatment device for the tube sheet and shell weld of a shell-and-tube heat exchanger tube head, comprising a center ring plate, an intermediate connecting ring plate and a support strip plate, the center ring plate and the intermediate connecting ring plate are arranged in a concentric manner, the outer diameter of the center ring plate is smaller than the outer diameter of the intermediate connecting ring plate; characterized in that: Four to eight support strips are arranged circumferentially around the central ring plate and the intermediate connecting ring plate. The inner end of the support strip is fixed to the bottom surface of the central ring plate with bolts and nuts. The middle position of the support strip is fixed to the bottom surface of the intermediate connecting ring plate with bolts and nuts. The outer end of the support strip extends to the outer side of the first and second outer arc-shaped ring plates. The inner pressure strip is arranged inside the first and second outer arc-shaped ring plates. The inner pressure strip includes an inner pressure strip body, which is Z-shaped. The first bending surface is located at the upper part of the inner pressure strip body, and the second bending surface is located at the lower part of the inner pressure strip body. The first slot is opened on the second bending surface and is strip-shaped. The large through hole is opened on the outer side of the first bending surface, and the small through hole is opened inside the large through hole. On the side, the large and small through holes are arranged radially linearly; the outer pressure strip is set on the outside of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two. The outer pressure strip includes the outer pressure strip body, which is Z-shaped. The bending surface A is set on the upper part of the outer pressure strip body, and the bending surface B is set on the lower part of the outer pressure strip body. The second slot is opened in the middle of the bending surface B and is strip-shaped; the through hole is opened in the upper middle part of the bending surface A, and the clamping bolt and clamping nut are installed in the through hole; the outer arc-shaped ring plate one and the outer arc-shaped ring plate two are semi-circular in shape. The inner sides of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two overlap to form a cylindrical shape. The rear end face of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two are fixed to the front side of the support strip by pins or spot welding.

2. The device for synchronously heat treating the tube sheet and shell weld of a shell-and-tube heat exchanger tube head according to claim 1, characterized in that: The support strip includes a support strip body, which is strip-shaped. A strip groove is formed in the middle of the support strip body and extends through the support strip body. Bolts pass through the inner end of the strip groove and the central ring plate and are tightened and fixed by nuts. Bolts also pass through the middle of the strip groove and the middle connecting ring plate and are tightened and fixed by nuts.

3. The device for simultaneous heat treatment of the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger according to claim 1, characterized in that: The inner pressure strip body and the outer pressure strip body are fixedly mounted on the support strip body at circumferential intervals around the central ring plate and the intermediate connecting ring plate; the slot one of the inner pressure strip body corresponds to the front and back of the strip groove, and is fixed to the inner side of the outer arc ring plate one and the outer arc ring plate two by bolts passing through the slot one and the strip groove and tightening with nuts; the slot two of the outer pressure strip body corresponds to the front and back of the strip groove, and is fixed to the outer side of the outer arc ring plate one and the outer arc ring plate two by bolts passing through the slot two and the strip groove and tightening with nuts.

4. The device for simultaneous heat treatment of the tube head tube sheet and shell weld of a shell-and-tube heat exchanger according to claim 1, characterized in that: The first and second bending surfaces are parallel to the surfaces of the central ring plate and the intermediate connecting ring plate. The first bending surface faces the front side of the central ring plate and the intermediate connecting ring plate, and the rear side of the second bending surface is in contact with the front side of the support strip plate body.

5. The device for simultaneous heat treatment of the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger according to claim 1, characterized in that: The bending surfaces A and B are parallel to the surfaces of the central ring plate and the intermediate connecting ring plate. The bending surface A faces the front side of the central ring plate and the intermediate connecting ring plate, and the rear side of the bending surface B is in contact with the front side of the support strip plate body.

6. The device for simultaneous heat treatment of the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger according to claim 1, characterized in that: The height of the outer pressure plate body is greater than the height of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two.

7. The device for simultaneous heat treatment of the weld between the tube head tube sheet and the shell of a shell-and-tube heat exchanger according to claim 6, characterized in that: The outer arc-shaped ring plate one and the outer arc-shaped ring plate two are made of elastic steel plate, and the overlapping surfaces of the outer arc-shaped ring plate one and the outer arc-shaped ring plate two are fixedly connected by pins or spot welding; the diameter of the cylindrical shape formed by the outer arc-shaped ring plate one and the outer arc-shaped ring plate two is equal to the circumferential diameter of the tube sheet.

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