Circumferential weld local post-welding heat treatment equipment

By designing heat treatment equipment after local welding of ring welds, using combined arrangement of heaters and thermocouples and insulation measures, the local heat treatment problem of welds for special-shaped pipe fittings in high-pressure pipe sections is solved, uniform heating and position adjustment of the welds are achieved, and the heating and insulation requirements are met.

CN223214149UActive Publication Date: 2025-08-12BEIJING YANHUA CONSTR ENG CO LTD
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Patent Information

Application Number
CN202422535496.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-21
Publication Date
2025-08-12
Estimated Expiration
2034-10-21

AI Technical Summary

Technical Problem

It is difficult for the prior art to effectively perform local post-weld heat treatment on the ring welds of high-pressure pipe sections and special-shaped pipe fittings, especially because one side with large cross-sectional size is fast heat dissipated, and conventional methods are difficult to meet the power requirements of heating and insulation.

Method used

A heat treatment equipment after local welding of ring welds is designed, using heaters and thermocouples set at equal intervals. The heater power is adjusted through the controller, combined with the insulation layer and the insulation pad to achieve uniform heating and temperature insulation of the welds, and the distance between the heater and the welds is adjusted through the hydraulic cylinder, and the weld position is adjusted using the rollers.

Benefits of technology

It realizes uniform heating and temperature insulation of ring welds, facilitates adjustment and heat treatment of weld positions of special-shaped pipe fittings, and meets the requirements of heating and insulation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of manufacturing of high-pressure pipe sections, pressure containers and structural parts, and discloses heat treatment equipment after local welding of circumferential welds, which comprises an equipment box body, a door body is arranged at the front end of the equipment box body, and a heat preservation layer is fixed on the inner side of the equipment box body. According to the heat treatment equipment after local welding of the circumferential weld, the heaters and the thermocouples are arranged in a one-to-one correspondence mode, the thermocouples are fixed to the outer side of a pipe fitting workpiece in a spot welding mode and do not make direct contact with the heaters, and one thermocouple controls power adjustment of the corresponding heater; the multiple sets of heaters arranged at equal intervals are parallel to the direction of a welding seam on the pipe fitting, the welding seam on the pipe fitting can be evenly heated, the welding seam is heated evenly, the temperature of a heated workpiece can be kept by arranging the heat preservation layer and the heat preservation pad, and the heating and heat preservation requirements of the welding seam are met; the problem that heat treatment cannot be conveniently carried out after local welding of a circular seam is solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing high-pressure pipe sections, pressure vessels and structural parts, in particular to heat treatment equipment after local welding of girth welds. Background Art

[0002] Conventional post-weld heat treatment methods include local post-weld heat treatment and overall post-weld heat treatment. In overall post-weld heat treatment, the entire workpiece is placed in the furnace for heat treatment. This type of heat treatment is characterized by easy temperature control and simple operation. For the manufacture of slender pipe sections, it is also possible to make a slender overall annealing furnace. However, if the pipe section manufacture involves welding pipe fittings such as tees and elbows to the pipe, and the position of the pipe fittings cannot be fixed during the pipe section manufacturing process, the position of the pipe fittings of the pipe section must be designed according to the site orientation and device layout. In this case, it is not easy to design this special-shaped annealing furnace into a universal overall annealing furnace. Local heat treatment only heats the weld and the nearby base material. The heating device is arranged along the weld, which has certain requirements for the heating belt and the insulation belt. According to conventional heat treatment methods, due to the high-pressure pipe section, the pipe wall is thick and is generally made of forged steel pipe, and pipe fittings such as tees are also made of forgings. Therefore, in the conventional local post-weld heat treatment method, the heating device is arranged along the weld. Since the side with a large cross-section dissipates heat quickly, even if the insulation belt is lengthened, it cannot meet the power requirements of heating and insulation, which is insufficient.

[0003] Now, a new type of heat treatment equipment for local post-weld girth welds is proposed to solve the above-mentioned shortcomings. Utility Model Content

[0004] The purpose of the utility model is to provide a heat treatment device for a girth weld after local welding, so as to solve the problem in the above background technology that it is inconvenient to perform heat treatment on the girth weld after local welding.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: heat treatment equipment after local welding of circumferential welds, including an equipment box, a door body is provided at the front end of the equipment box, an insulation layer is fixed on the inner side of the equipment box, a mounting seat is provided at the top end of the inside of the equipment box, and a mounting plate is provided at the bottom end of the mounting seat, a heater is installed and fixed at the bottom end of the mounting plate, and a thermocouple is provided at the bottom end of the heater, an insulation pad is fixed at the rear end of the door body, a controller is installed and fixed at the front end of the right side of the equipment box, a connecting rod is fixed at the top end of the mounting plate, and the top end of the connecting rod passes through the interior of the mounting seat, and a locking nut is provided at the top end of the connecting rod.

[0006] Furthermore, the connecting rods are arranged in multiple groups at equal intervals on the top of the mounting plate, and the locking nuts are rotatably connected to the outside of the connecting rods.

[0007] Furthermore, the heaters and thermocouples are arranged in multiple groups at equal intervals, the heaters and thermocouples correspond to each other one by one, and the heaters and thermocouples are electrically connected to the controller respectively.

[0008] Preferably, guide rods are vertically fixed at the four corners of the top of the mounting seat, sliding sleeves are fixed inside the four corners of the top of the equipment box, hydraulic cylinders are installed and fixed at both ends of the top of the equipment box, and the output end of the bottom of the hydraulic cylinder passes through the interior of the top of the equipment box and is fixedly connected to the middle position of the top of the mounting seat.

[0009] Furthermore, the guide rod passes through the interior of the sliding sleeve.

[0010] Preferably, a base is fixed to the top of the interior of the device housing, and a bottom platform is fixed to the top of the base. Three sets of mounting grooves are provided at equal intervals on both sides of the top of the bottom platform, and rollers are movably connected to the interior of the mounting grooves.

[0011] Furthermore, the mounting grooves and rollers are provided in multiple groups at equal intervals in the longitudinal direction on both sides of the top of the base.

[0012] Preferably, fixing frames are fixed to the top and bottom of the left front end of the equipment box, connecting feet are fixed to the top and bottom of the left side of the door body, a handle is fixed to the right side of the front end of the door body, locking rods are movably connected to the top and bottom of the right side of the front end of the door body, connecting frames are welded and fixed to the top and bottom of the right front end of the equipment box, and a card slot is provided inside the top of the connecting frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the heat treatment equipment for local post-weld girth welds not only facilitates heat treatment of local post-weld girth welds, facilitates adjustment of the heating distance between the heating assembly and the workpiece, but also facilitates adjustment of the heat treatment position of the pipe fitting;

[0014] (1) The equipment box, insulation layer, mounting seat, heater, mounting plate, thermocouple, controller, connecting rod, locking nut, door and insulation pad are provided, and the heater and thermocouple are arranged in a one-to-one correspondence. The thermocouple is spot-welded and fixed to the outside of the pipe workpiece. There is no direct contact between the thermocouple and the heater. One thermocouple controls the power adjustment of one heater. The arrangement of multiple groups of heaters arranged at equal intervals is parallel to the direction of the weld on the pipe, which can uniformly heat the weld on the pipe and make the weld heat up evenly. The insulation layer and insulation pad can be provided to keep the workpiece warm after heating, so as to meet the temperature rise and insulation requirements of the weld after local welding of the girth weld.

[0015] (2) By providing a mounting plate, a mounting seat, a sliding guide rod and a hydraulic cylinder, when the equipment is used, the pipe fitting is placed inside the equipment box and the weld is locally heated by the heater. The hydraulic cylinder can be controlled to start, and the bottom output end can be extended downward. At the same time, the mounting seat can be moved down at the top of the equipment box to be close to the weld position. The output end can be retracted, and the heater can be driven to move up and away from the weld position, so that the heating distance between the heater and the weld position of the workpiece can be adjusted for heating.

[0016] (3) By providing a base, a mounting groove, rollers and a base, when the pipe fitting is placed on the top of the base inside the equipment box for heat treatment, multiple sets of rollers are movably connected on both sides of the base. The multiple sets of rollers can be used to conveniently rotate the pipe fitting on the top of the base, making it convenient to adjust the heat treatment position of the weld on the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the front view structure of the mounting plate of the present utility model;

[0019] Figure 3 This is a schematic diagram of the top view of the mounting base of the utility model;

[0020] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the equipment box of the utility model from a side view;

[0021] Figure 5 This is a schematic diagram of the enlarged structure of the base platform of the present invention from a top view;

[0022] Figure 6 It is a schematic diagram of an enlarged top view of the door body of the present invention.

[0023] In the figure: 1. Insulation layer; 2. Equipment box; 3. Base; 4. Heater; 5. Mounting plate; 6. Mounting seat; 7. Sleeve; 8. Guide rod; 9. Hydraulic cylinder; 10. Thermocouple; 11. Controller; 12. Mounting slot; 13. Roller; 14. Base; 15. Connecting rod; 16. Locking nut; 17. Door; 18. Insulation pad; 19. Locking rod; 20. Fixing bracket; 21. Connecting foot; 22. Handle; 23. Slot; 24. Connecting bracket. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1: Please refer to Figure 1-6 , heat treatment equipment after local welding of the girth weld, including an equipment box 2, a door body 17 is provided at the front end of the equipment box 2, an insulation layer 1 is fixed to the inside of the equipment box 2, a mounting seat 6 is provided at the top end of the interior of the equipment box 2, and a mounting plate 5 is provided at the bottom end of the mounting seat 6, a heater 4 is fixed to the bottom end of the mounting plate 5, and a thermocouple 10 is provided at the bottom end of the heater 4, a thermal insulation pad 18 is fixed to the rear end of the door body 17, a controller 11 is fixed to the front end of the right side of the equipment box 2, a connecting rod 15 is fixed to the top of the mounting plate 5, and the top end of the connecting rod 15 passes through the interior of the mounting seat 6, and a locking nut 16 is provided at the top end of the connecting rod 15;

[0026] The connecting rods 15 are provided in multiple groups at equal intervals on the top of the mounting plate 5. The locking nuts 16 are rotatably connected to the outside of the connecting rods 15. The heaters 4 and the thermocouples 10 are provided in multiple groups at equal intervals. The heaters 4 and the thermocouples 10 correspond one to one. The heaters 4 and the thermocouples 10 are electrically connected to the controller 11 respectively.

[0027] Specifically, if Figure 1 and Figure 4 As shown, the heater 4 and the thermocouple 10 are arranged in a one-to-one correspondence, and the thermocouple 10 is spot-welded and fixed on the outside of the pipe workpiece. There is no direct contact between the thermocouple 10 and the heater 4. One thermocouple 10 controls the power adjustment of one heater 4. The arrangement of multiple groups of heaters 4 arranged at equal intervals is parallel to the direction of the weld on the pipe fitting, which can uniformly heat the weld on the pipe fitting and make the weld heat up evenly. By arranging the insulation layer 1 and the insulation pad 18, the temperature of the workpiece can be kept warm after heating, meeting the heating and insulation requirements at the weld.

[0028] Example 2: Guide rods 8 are vertically fixed to the four corners of the top of the mounting base 6, and sliding sleeves 7 are fixed inside the four corners of the top of the equipment box 2. Hydraulic cylinders 9 are respectively installed and fixed at both ends of the top of the equipment box 2, and the output end of the bottom of the hydraulic cylinder 9 passes through the interior of the top of the equipment box 2 and is fixedly connected to the middle position of the top of the mounting base 6. The guide rods 8 pass through the interior of the sliding sleeves 7;

[0029] Specifically, if Figure 1 、 Figure 3 and Figure 4As shown, when the pipe is placed inside the equipment box 2 and the heater 4 is used to perform local heat treatment on the weld, the hydraulic cylinder 9 can be controlled to start, and the bottom output end can be extended downward. At the same time, the mounting seat 6 can be moved down at the top of the equipment box 2, close to the weld position, and the output end can be retracted, which can drive the heater 4 to move up and away from the weld position, making it convenient to adjust the heating distance between the heater 4 and the weld position of the workpiece for heating.

[0030] Example 3: A base 14 is fixed to the top of the interior of the equipment box 2, and a bottom platform 3 is fixed to the top of the base 14. Three sets of mounting grooves 12 are evenly spaced inside the interior of both sides of the top of the bottom platform 3, and the interior of the mounting grooves 12 is movably connected to rollers 13. Multiple sets of mounting grooves 12 and rollers 13 are provided longitudinally and evenly spaced inside the interior of both sides of the top of the bottom platform 3;

[0031] Specifically, if Figure 1 and Figure 5 As shown, when the pipe fitting is placed on the top of the base 3 inside the equipment box 2 for heat treatment, multiple sets of rollers 13 are movably connected on both sides of the base 3. The multiple sets of rollers 13 can be used to conveniently rotate the pipe fitting on the top of the base 3 to adjust the heat treatment position of the weld on the pipe fitting.

[0032] Fixing frames 20 are fixed to the top and bottom of the left front end of the equipment box 2, connecting feet 21 are fixed to the top and bottom of the left side of the door body 17, a handle 22 is fixed to the right side of the front end of the door body 17, and locking rods 19 are movably connected to the top and bottom of the right side of the front end of the door body 17. Connecting frames 24 are welded and fixed to the top and bottom of the right front end of the equipment box 2, and a card slot 23 is provided inside the top of the connecting frame 24.

[0033] Working principle: When the utility model is in use, a heater 4 and a thermocouple 10 are arranged in a one-to-one correspondence. The thermocouple 10 is spot-welded and fixed on the outside of the pipe workpiece. There is no direct contact between the thermocouple 10 and the heater 4. One thermocouple 10 controls the power adjustment of one heater 4. The arrangement of multiple groups of heaters 4 arranged at equal intervals is parallel to the direction of the weld on the pipe, which can uniformly heat the weld on the pipe and make the weld heat up evenly. By setting the insulation layer 1 and the insulation pad 18, the temperature of the workpiece after heating can be kept warm, meeting the heating and insulation requirements of the weld. At the same time, the pipe is placed inside the equipment box 2 and the heater 4 is used for welding. When local heat treatment is performed on the seam, the hydraulic cylinder 9 can be controlled to start, and the bottom output end can be extended downward. At the same time, the mounting seat 6 can be moved down at the top of the equipment box 2, close to the weld position, and the output end can be retracted, which can drive the heater 4 to move up away from the weld position, and the heating distance between the heater 4 and the weld position of the workpiece can be adjusted for heating. When the pipe is placed on the top of the base 3 inside the equipment box 2 for heat treatment, multiple sets of rollers 13 are movably connected on both sides of the base 3. The multiple sets of rollers 13 can be used to conveniently rotate the pipe on the top of the base 3 to adjust the weld heat treatment position on the pipe.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A heat treatment device for a localized girth weld, comprising a device housing (2), characterized in that: The front end of the equipment box (2) is provided with a door body (17), the inner side of the equipment box (2) is fixed with a heat-insulating layer (1), the top end of the interior of the equipment box (2) is provided with a mounting seat (6), and the bottom end of the mounting seat (6) is provided with a mounting plate (5), the bottom end of the mounting plate (5) is fixed with a heater (4), and the bottom end of the heater (4) is provided with a thermocouple (10), the rear end of the door body (17) is fixed with a heat-insulating pad (18), the front end of the right side of the equipment box (2) is fixed with a controller (11), the top end of the mounting plate (5) is fixed with a connecting rod (15), and the top end of the connecting rod (15) passes through the interior of the mounting seat (6), and the top end of the connecting rod (15) is provided with a locking nut (16).

2. The heat treatment equipment for local post-weld girth welds according to claim 1, characterized in that: The connecting rods (15) are arranged in multiple groups at equal intervals on the top of the mounting plate (5), and the locking nuts (16) are rotatably connected to the outside of the connecting rods (15).

3. The heat treatment equipment for local post-weld girth welds according to claim 1, characterized in that: The heaters (4) and thermocouples (10) are arranged in multiple groups at equal intervals, the heaters (4) and thermocouples (10) correspond to each other one by one, and the heaters (4) and thermocouples (10) are electrically connected to the controller (11) respectively.

4. The heat treatment equipment for local post-weld girth welds according to claim 1, characterized in that: Guide rods (8) are vertically fixed at the four corners of the top of the mounting seat (6), and sliding sleeves (7) are fixed inside the four corners of the top of the equipment box (2). Hydraulic cylinders (9) are fixed at both ends of the top of the equipment box (2), and the output end of the bottom of the hydraulic cylinder (9) passes through the inside of the top of the equipment box (2) and is fixedly connected to the middle position of the top of the mounting seat (6).

5. The heat treatment equipment after local welding of girth weld according to claim 4, characterized in that: The guide rod (8) passes through the interior of the sliding sleeve (7).

6. The heat treatment equipment for local post-weld girth welds according to claim 1, characterized in that: A base (14) is fixed to the top of the interior of the equipment box (2), and a base (3) is fixed to the top of the base (14). Three groups of mounting grooves (12) are provided at equal intervals on both sides of the top of the base (3), and rollers (13) are movably connected to the interior of the mounting grooves (12).

7. The heat treatment equipment for local post-weld girth welds according to claim 6, characterized in that: The mounting grooves (12) and rollers (13) are respectively arranged in multiple groups at equal intervals in the longitudinal direction on both sides of the top of the base (3).

8. The heat treatment equipment for local post-weld girth welds according to claim 1, characterized in that: The top and bottom of the left front end of the equipment box (2) are respectively fixed with a fixing frame (20), the top and bottom of the left side of the door body (17) are respectively fixed with a connecting foot (21), the right side of the front end of the door body (17) is fixed with a handle (22), the top and bottom of the right side of the front end of the door body (17) are respectively movably connected with a locking rod (19), the top and bottom of the right front end of the equipment box (2) are respectively welded and fixed with a connecting frame (24), and a card slot (23) is provided inside the top of the connecting frame (24).