Heating device for preheating and post-heating in cylinder girth welding

Abstract

The utility model provides a heating device for preheating and post-heating in cylinder girth welding, and belongs to the technical field of welding of pressure containers. The problem that in the prior art, the inner wall and the outer wall of a cylinder circular seam cannot be heated at the same time is solved. The heating device comprises an internal heating mechanism and an external heating mechanism, the internal heating mechanism and the external heating mechanism are arranged on the inner side and the outer side of a barrel respectively, two adjacent first arc-shaped heating pipes are connected through a first heating pipe connecting device, and the other two adjacent first arc-shaped heating pipes are connected through a first heating pipe connecting device. Every two opposite first arc-shaped heating pipes are connected through a first connecting pipe, a plurality of first burners are evenly distributed on each first arc-shaped heating pipe, every two adjacent second arc-shaped heating pipes are connected through a second heating pipe connecting device, and every two second heating pipe connecting devices are connected through a second connecting pipe. And a plurality of second burners are uniformly distributed on the second arc-shaped heating pipe. The circular seam welding preheating and post-heating device is mainly used for preheating and post-heating of circular seam welding.

Description

Technical Field

[0001] The utility model belongs to the technical field of the welding of pressure vessels, and particularly relates to a heating device for preheating and postheating the circumferential seam welding of a cylinder body. Background Technique

[0002] With the rapid development of the petrochemical industry, the material selection grade of Cr-Mo steel for pressure vessels is getting higher and higher, the wall thickness is getting larger and larger, and the requirements for pre-welding preheating and post-welding postheating are getting higher and higher. If the effects of pre-welding preheating and post-welding postheating do not meet the required standards, it is very difficult to ensure the welding quality. The Chinese invention patent with the publication number CN212793673U discloses a circumferential seam heating device for pressure vessel welding, which includes an adjusting bracket and two arc-shaped pipes. A plurality of air outlet holes are uniformly processed on the arc-shaped pipe facing the inside along the arc length direction, and a wind pipe is arranged on the arc-shaped pipe at each air outlet hole. Two inclined notches are symmetrically processed at the end of the wind pipe at the connection with the arc-shaped pipe. An upper connecting pipe is arranged on the upper part of the arc-shaped pipe facing the outside, and a lower connecting pipe is arranged on the lower part. The two upper connecting pipes are connected through a first U-shaped pipe, the two lower connecting pipes are connected through a second U-shaped pipe, and the first U-shaped pipe and the second U-shaped pipe are connected through a vertical pipe. An air inlet pipe is arranged in the middle of the vertical pipe. A cross bar is arranged on the arc-shaped pipe between the upper connecting pipe and the lower connecting pipe, a connecting rod is arranged at the end between the two cross bars, and a round bar is horizontally arranged on the connecting rod. The structure of the utility model is simple, the combustion is sufficient, and the heating effect is good, which has significant economic value and social value. However, this device cannot heat both the inside and outside of the circumferential seam of the cylinder body. Content of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide a heating device for preheating and postheating the circumferential seam welding of a cylinder body, so as to solve the problem in the prior art that the inside and outside of the circumferential seam of the cylinder body cannot be heated.

[0004] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0005] A heating device for preheating and post-heating the circumferential weld of a cylinder body, comprising an internal heating mechanism and an external heating mechanism. The internal heating mechanism and the external heating mechanism are respectively arranged on the inner side and the outer side of the cylinder body. The external heating mechanism includes a first air inlet pipe, four first arc-shaped heating pipes, a first connecting pipe, a first burner and a first heating pipe connecting device. Two adjacent first arc-shaped heating pipes are connected by the first heating pipe connecting device, and the other two adjacent first arc-shaped heating pipes are connected by the first heating pipe connecting device. The two opposite first arc-shaped heating pipes are connected by the first air inlet pipe. A plurality of first burners are evenly distributed on the first arc-shaped heating pipes. The internal heating mechanism includes a second air inlet pipe, four second arc-shaped heating pipes, a second connecting pipe, a second burner, a second heating pipe connecting device and a support member. Two adjacent second arc-shaped heating pipes are connected by the second heating pipe connecting device, and the other two adjacent second arc-shaped heating pipes are connected by the second heating pipe connecting device. The two opposite second heating pipe connecting devices are connected by the second connecting pipe. A plurality of second burners are evenly distributed on the second arc-shaped heating pipes. The four second arc-shaped heating pipes are connected to the support member.

[0006] Further, a first plug is installed at the end of the first air inlet pipe.

[0007] Further, two opposite first arc-shaped heating pipes are installed on a support column.

[0008] Further, a height adjusting device is provided at the bottom of the support column.

[0009] Further, a second plug is installed at the end of the second connecting pipe.

[0010] Further, the telescopic support leg is connected to the inner wall of the cylinder body, and the arc plate is connected to the telescopic counterweight through the arc plate connecting device.

[0011] Further, the support member includes a telescopic support leg, a bearing and a telescopic counterweight. The telescopic counterweight is connected to the support plate. The two telescopic support legs are cross-connected. The bearing is installed at the connecting part of the two telescopic support legs.

[0012] Further, one end of the telescopic support leg is connected to the second arc-shaped heating pipe, and the other end is connected to the arc plate. The arc plate is connected to the telescopic counterweight through the arc plate connecting device.

[0013] Further, a heat insulation layer is installed on the outer side of the arc plate.

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

[0015] 1. The utility model adopts internal heating and external heating methods, which can ensure uniform temperature distribution in the entire circumferential weld area, avoid the problem of thermal stress concentration caused by excessive temperature gradient. This is very important for reducing material fatigue and extending the service life of pressure vessels. Heating both internally and externally can ensure uniform temperature in the welding area, contribute to the stability of the molten pool formation and the quality of the weld during the welding process. Especially in the welding of large thick-walled pressure vessels, uniform internal and external heating can avoid welding deformation and cracks caused by temperature differences. In the long run, it can save energy costs, and can precisely control the temperature and heating area, making the operation more convenient and safe.

[0016] 2. The utility model can effectively meet the requirements of preheating before welding and post-welding post-heating for the circumferential welds of large-wall-thickness high-grade Cr-Mo steel cylinders, can effectively ensure the preheating and post-heating effects. At the same time, the heating device has a certain degree of versatility, which can reduce the manufacturing cost of the heating device to a certain extent, improve work efficiency, and is convenient for popularization and application.

[0017] 3. The internal heating tube of the utility model can rotate, and can heat each position inside the cylinder, ensuring heating uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0019] Figure 1 is the structural schematic diagram of the external heating mechanism described in the present utility model Figure 1 ;

[0020] Figure 2 is the structural schematic diagram of the external heating mechanism described in the present utility model Figure 2 ;

[0021] Figure 3 is the structural schematic diagram of the internal heating mechanism described in the present utility model Figure 1 ;

[0022] Figure 4 is the structural schematic diagram of the internal heating mechanism described in the present utility model Figure 2 。

[0023] 1 - First intake pipe, 2 - First arc-shaped heating pipe, 3 - First plug, 4 - First connecting pipe, 5 - First burner, 6 - First heating pipe connecting device, 7 - Support column, 8 - Second intake pipe, 9 - Second arc-shaped heating pipe, 10 - Second plug, 11 - Second connecting pipe, 12 - Second burner, 13 - Second heating pipe connecting device, 14 - Telescopic bracket, 15 - Support plate, 16 - Telescopic leg, 17 - Bearing, 18 - Telescopic counterweight, 19 - Arc plate, 20 - Arc plate connecting device, 21 - Thermal insulation layer, 7-1: Height adjustment device. Detailed implementation manner

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0025] Refer to Figures 1-4 In this embodiment, a heating device for preheating and post-heating the circumferential seam welding of a cylinder body is characterized in that it includes an internal heating mechanism and an external heating mechanism. The internal heating mechanism and the external heating mechanism are respectively arranged on the inner side and the outer side of the cylinder body. The external heating mechanism includes a first intake pipe 1, four first arc-shaped heating pipes 2, a first connecting pipe 4, a first burner 5, and a first heating pipe connecting device 6. Among them, two adjacent first arc-shaped heating pipes 2 are connected by the first heating pipe connecting device 6, and the other two adjacent first arc-shaped heating pipes 2 are connected by the first heating pipe connecting device 6. The two opposite first arc-shaped heating pipes 2 are connected by the first connecting pipe 4. A plurality of first burners 5 are evenly distributed on the first arc-shaped heating pipe 2. The internal heating mechanism includes a second intake pipe 8, four second arc-shaped heating pipes 9, a second connecting pipe 11, a second burner 12, a second heating pipe connecting device 13, and a support member. Among them, two adjacent second arc-shaped heating pipes 9 are connected by the second heating pipe connecting device 13, and the other two adjacent second arc-shaped heating pipes 9 are connected by the second heating pipe connecting device 13. The two opposite second heating pipe connecting devices 13 are connected by the second connecting pipe 11. A plurality of second burners 12 are evenly distributed on the second arc-shaped heating pipe 9. The four second arc-shaped heating pipes 9 are connected to the support member. A first plug 3 is installed at the end of the first intake pipe 1, and a second plug 10 is installed at the end of the second connecting pipe 11. The two opposite first arc-shaped heating pipes 2 are installed on the support column 7.

[0026] First, install the device at the preheating or post-heating position of the workpiece circumferential seam. Then, introduce natural gas into the first inlet pipe 1 and the second inlet pipe 8 respectively. Through the first connecting pipe 4, ensure that natural gas can be introduced into each first arc-shaped heating pipe 2, and through the second connecting pipe 11, ensure that natural gas can be introduced into each second arc-shaped heating pipe 9. After introducing natural gas, ignite the natural gas at the first burner 5 and the second burner 12 to achieve internal heating and external heating of the cylinder circumferential seam. By adopting the internal heating and external heating methods, it can ensure uniform temperature distribution in the entire circumferential seam area, avoid the problem of thermal stress concentration caused by too large temperature gradient, which is very important for reducing material fatigue and extending the service life of pressure vessels. Internal and external heating can ensure uniform temperature in the welding area, contribute to the stability of the molten pool formation and the quality of the weld during the welding process. Especially in the welding of large-thick-wall pressure vessels, uniform internal and external heating can avoid welding deformation and cracks caused by temperature differences. In the long run, it can save energy costs, accurately control the temperature and heating area, making the operation more convenient and safe. It can effectively meet the requirements of preheating before welding and post-heating after welding for the circumferential seam of cylinders made of large-wall-thickness high-grade Cr-Mo steel materials, effectively ensure the preheating and post-heating effects. At the same time, this heating device has a certain degree of versatility, which can reduce the manufacturing cost of the heating device to a certain extent, improve work efficiency, and facilitate popularization and application.

[0027] A height adjustment device 7-1 is provided at the bottom of the pillar 7, which can adjust the height of the external heating mechanism according to the installation height during workpiece welding, ensuring the accuracy of the heating temperature of the circumferential seam and avoiding excessive heat loss.

[0028] A telescopic bracket 14 is installed on the second arc-shaped heating pipe 9. The telescopic bracket 14 is connected to the support plate 15. The support member includes telescopic legs 16, bearings 17, and telescopic counterweights 18. The telescopic counterweights 18 are connected to the support plate 15. The two telescopic legs 16 are cross-connected. The bearing 17 is installed at the connection part of the two telescopic legs 16. The telescopic legs 16 are connected to the inner wall of the cylinder. The arc plate 19 is connected to the telescopic counterweights 18 through the arc plate connection device 20.

[0029] Through the telescopic bracket 14, the circumferential radius of the internal heating mechanism can be adjusted according to the inner diameter of the cylinder, and the cross-set telescopic legs 16 are connected. The cross-set telescopic legs 16 can rotate, and during the rotation process, each position of the inner wall can be heated, ensuring the uniformity of heating.

[0030] A heat-insulating layer 21 is installed on the outer side of the arc plate 19. During heating, it can play a certain heat-insulating role through the heat-insulating layer 21 to avoid too fast a rate of temperature drop and affect the heating effect.

[0031] The embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model.

Claims

1. A heating device for preheating and post-heating the circumferential weld of a cylinder body, characterized in that: It includes an internal heating mechanism and an external heating mechanism. The internal heating mechanism and the external heating mechanism are respectively arranged on the inner side and the outer side of the cylinder body. The external heating mechanism includes a first air inlet pipe (1), four first arc-shaped heating pipes (2), a first connecting pipe (4), a first burner (5) and a first heating pipe connecting device (6). Two adjacent first arc-shaped heating pipes (2) are connected by the first heating pipe connecting device (6), and the other two adjacent first arc-shaped heating pipes (2) are connected by the first heating pipe connecting device (6). The two opposite first arc-shaped heating pipes (2) are connected by the first connecting pipe (4). A number of first burners (5) are evenly distributed on the first arc-shaped heating pipes (2). The internal heating mechanism includes a second air inlet pipe (8), four second arc-shaped heating pipes (9), a second connecting pipe (11), a second burner (12), a second heating pipe connecting device (13) and a support. Two adjacent second arc-shaped heating pipes (9) are connected by the second heating pipe connecting device (13), and the other two adjacent second arc-shaped heating pipes (9) are connected by the second heating pipe connecting device (13). The two opposite second heating pipe connecting devices (13) are connected by the second connecting pipe (11). A number of second burners (12) are evenly distributed on the second arc-shaped heating pipes (9). The four second arc-shaped heating pipes (9) are connected to the support.

2. The heating device for preheating and post-heating of the circumferential seam welding of the cylinder body according to claim 1, wherein: A first plug (3) is installed at the end of the first air inlet pipe (1).

3. A heating device for preheating and post-heating the circumferential seam welding of a cylinder body according to claim 1, characterized in that: Two opposite first arc-shaped heating pipes (2) are installed on the support column (7).

4. A heating device for preheating and post-heating the circumferential seam welding of a cylinder body according to claim 3, characterized in that: A height adjusting device (7-1) is provided at the bottom of the support column (7).

5. The heating device for preheating and post-heating the circumferential weld of a cylinder body according to claim 1, characterized in that: A second plug (10) is installed at the end of the second connecting pipe (11).

6. A heating device for preheating and post-heating the circumferential seam welding of a cylinder body according to claim 1, characterized in that: A telescopic bracket (14) is installed on the second arc-shaped heating pipe (9), and the telescopic bracket (14) is connected to the support plate (15).

7. The heating device for preheating and post-heating of the circumferential seam welding of the cylinder body according to claim 6, wherein: The support includes telescopic legs (16), bearings (17) and telescopic counterweights (18). The telescopic counterweights (18) are connected to the support plate (15). The two telescopic legs (16) are cross-connected, and the bearings (17) are installed at the connecting part of the two telescopic legs (16).

8. A heating device for preheating and post-heating the circumferential seam welding of a cylinder body according to claim 7, characterized in that: The telescopic legs (16) are connected to the inner wall of the cylinder body, and the telescopic counterweights (18) are connected to the arc plate (19) through the arc plate connecting device (20).

9. The heating device for preheating and post-heating of the circumferential seam welding of the cylinder body according to claim 8, characterized in that: A heat insulation layer (21) is installed on the outer side of the arc plate (19).

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