Welding forming device for large-head and small-head titanium pipe fittings

Abstract

The utility model discloses a welding forming device for a large-and-small-head titanium pipe fitting. The large-and-small-head titanium pipe fitting is provided with a middle section, a large-head section and a small-head section, wherein the diameters of the two ends of the middle section are different, and the large-head section and the small-head section are located at the two ends of the middle section and are of a straight cylinder structure. The large-head and small-head titanium pipe fitting is of a split structure, and the welding forming device enables a middle section, a large-head section and a small-head section to be coaxially and detachably connected through ports. The welding forming device comprises flat attaching rings which are sequentially sleeved and attached to the outer surface, close to the two end openings, of the middle section, and the outer end of each flat attaching ring horizontally extends to form a positioning ring for positioning and penetrating the large-head section and the small-head section. According to the welding forming device, the large end section and the small end section which are split can be coaxially positioned with the middle section respectively, welding operation is carried out after positioning, the welding defect caused by the fact that the middle section is difficult to place stably can be avoided, and therefore the coaxiality, namely the sealing performance after welding is improved, and the welding quality is improved. The problem that pipe body cracks are prone to being caused when a reducer pipe fitting is integrally formed at present is solved, the yield is increased, and the machining cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of pipe fitting welding, and particularly to a welding and forming device for reducing and enlarging titanium pipe fittings. Background Art

[0002] A reducing and enlarging connecting pipe is a kind of pipe connector used to connect two pipes with different diameters. Its main feature is that the diameters at both ends are different, divided into a large end and a small end, so it is called a "reducing and enlarging pipe". This design enables the reducing and enlarging connecting pipe to flexibly adapt to pipes with different diameters and achieve smooth connection of the pipeline. Reducing and enlarging connecting pipes can be divided into concentric reducing and enlarging pipes and eccentric reducing and enlarging pipes according to the connection method. The centers of the pipes after connection of concentric reducing and enlarging pipes are on the same straight line, which is suitable for the connection between straight pipe sections, while the centers of the pipes after connection of eccentric reducing and enlarging pipes (as shown in Figure 1 ) are not on the same straight line, which is suitable for occasions where the connection position is limited or other pipe fittings need to be avoided. Reducing and enlarging connecting pipes are widely used in various pipeline systems, especially in the fields of water supply, heating, chemical industry, petroleum, natural gas, etc. They can effectively solve the installation problems caused by inconsistent pipe diameters, improve the installation and construction efficiency of the pipeline system, and meet the usage requirements in engineering construction.

[0003] Currently, reducing and enlarging connecting pipes are usually processed and formed through processes such as necking pressing, expanding pressing, necking plus expanding pressing, and die pressing. When the blank pipe is formed by expanding pressing, since the large and small pipes need to be connected to the pipes at both ends in the later stage, horizontal extension forming at both ends is required after expanding to form a straight tube section connected to the pipeline, such as the reducing and enlarging section in the attached drawings of the specification. Currently, during the expanding and extending processing of the blank pipeline, the pipeline needs to undergo large deformations (such as a large difference in the inner diameters of the two ends). During the expanding and extending process, internal cracks and ruptures of the blank pipeline are extremely likely to occur, resulting in a low yield rate of reducing and enlarging pipe fittings. Therefore, a pre-treatment process is required to perform high-quality heat treatment on the blank pipe fittings to avoid the problems of cracks or ruptures not easily occurring in the pipeline during later expanding and extending processing, increasing the processing difficulty and cost of reducing and enlarging pipe fittings. Figure 1 Summary of the Invention

[0004] Aiming at the above existing problems, this application aims to provide a welding and forming device for reducing and enlarging titanium pipe fittings, which can coaxial position the split large end section and small end section with the middle section respectively, and perform welding operations after positioning, avoiding welding defects caused by the difficult stable placement of the middle section, thereby improving the coaxiality and sealing performance after welding.

[0005] To achieve the above object, the technical solution adopted in this application is as follows: A welding and forming device for a reducing titanium pipe fitting. The reducing titanium pipe fitting has an intermediate section with different diameters at both ends, and a large head section and a small head section located at both ends of the intermediate section and having a straight cylinder structure. It is characterized in that: the reducing titanium pipe fitting is a split structure, and the welding and forming device coaxially connects the ports where the intermediate section is connected to the large head section, and at the same time coaxially connects the ports where the intermediate section is connected to the small head section, and the welding and forming device is detachably connected to the intermediate section, the large head section and the small head section.

[0006] Preferably, the welding and forming device includes flat attachment rings that are sequentially sleeved and attached to the outer surfaces of the intermediate section near both ends, and a positioning ring that horizontally extends and penetrates through the large head section and the small head section is provided at the outer end of each flat attachment ring.

[0007] Preferably, welding holes are circumferentially spaced and opened at the joints of each flat attachment ring and the positioning ring.

[0008] Preferably, the inner wall surface of each positioning ring is provided with a conical structure.

[0009] The beneficial effect of this application is that: through the welding and forming device of this application, the split large head section and small head section can be coaxially positioned with the intermediate section respectively, and welding operations are carried out after positioning, which can avoid welding defects caused by the difficulty of stably placing the intermediate section, thereby improving the coaxiality after welding and ensuring the sealing performance, and finally solving the problems such as easy formation of cracks in the pipe body during the integral forming of reducing pipe fittings at present, improving the yield rate and reducing the processing cost. Description of the Drawings

[0010] Figure 1 It is a structural diagram of a reducing titanium pipe fitting.

[0011] Figure 2 It is a diagram of the split-structure reducing titanium pipe fitting of this application.

[0012] Figure 3 It is a diagram of the reducing titanium pipe fitting welded and formed by this application.

[0013] Figure 4 It is a diagram of the non-coaxial and unstable placement for welding at both ends of the intermediate section of this application.

[0014] Figure 5 It is a diagram of the dislocation of the large head section and the deviation of the small head section after split welding of this application.

[0015] Figure 6 It is a structural diagram of the welding and forming device of this application.

[0016] Figure 7 It is a diagram of this application with the flat attachment ring and the positioning ring to be sleeved on the intermediate section.

[0017] Figure 8 For this application Figure 7 Welding diagram after fitting.

[0018] Figure 9 Diagram before fitting the small head section of this application.

[0019] Figure 10 Diagram after fitting the small head section of this application.

[0020] Figure 11 Diagram of the conical inner wall structure of the positioning ring of this application.

[0021] Figure 12 Diagram of the hinged and opened structure of the flat ring and the positioning ring of this application. Specific implementation mode

[0022] In order to enable ordinary technicians in the art to better understand the technical solution of this application, the technical solution of this application will be further described below in conjunction with the drawings and embodiments.

[0023] Refer to the attached Figures 1 to 12 A welding and forming device for a reducing titanium pipe fitting shown in the figure. The reducing titanium pipe fitting has an intermediate section 11 with different diameters at both ends, and a large head section 12 and a small head section 13 located at both ends of the intermediate section 11 and having a straight tube structure. The large head section 12 and the small head section 13 are used for connecting to pipes with matching diameters later.

[0024] In order to solve the problem that it is difficult to process reducing pipe fittings at present, this application sets the reducing titanium pipe fitting as a split structure, that is, the intermediate section 11 is formed separately, and then the separately processed large head section 12 and small head section 13 are welded to the intermediate section 11, avoiding the problem that cracks are likely to occur when the intermediate section 11 needs to further extend the large head section 12 and the small head section 13 after diameter expansion.

[0025] And as Figure 1 shown, for an eccentric reducing connecting pipe, since its outer peripheral surface is a conical surface and the taper of the upper and lower sides is inconsistent after forming, when welding the large head section 12 and the small head section 13 later, the intermediate section 11 cannot be placed stably, and the axes of the two ports of the intermediate section 11 are not corresponding ( Figure 4 shown on the left), and when its outer peripheral surface is placed flat on the welding platform during welding, the axes of its large and small ends are both deflected ( Figure 4 shown), and after welding the large head section 12 and the small head section 13, there will be problems such as the large head section 12 being vertically displaced, skewed from the port axis, and the small head section 13 being horizontally deflected as shown in Figure 5 , which will affect the sealing performance of the reducing pipe fitting.

[0026] Therefore, in order to achieve precise welding of the large head section 12, the small head section 13 and the intermediate section 11, this application provides a welding and forming device, such asFigure 2 As shown, the reducing titanium pipe fitting is of a split structure. The welding forming device coaxially connects the ports where the middle section 11 is connected to the large head section 12, and at the same time coaxially connects the ports where the middle section 11 is connected to the small head section 13, and the welding forming device is detachably connected to the middle section 11, the large head section 12, and the small head section 13. After the welding forming device coaxially positions the large head section 12 and the small head section 13 with the middle section 11 respectively, the above-mentioned welding defects caused by the difficulty of stably placing the middle section 11 can be avoided, thereby improving the coaxiality after welding and ensuring the sealing performance. The detachable connection facilitates the detachment of the welding forming device from the middle section 11 after welding.

[0027] Specifically, as Figure 6 shown, the welding forming device includes flat attachment rings 21 that are sequentially sleeved and attached to the outer surfaces of the two ends of the middle section 11. At the outer ends of each of the flat attachment rings 21, positioning rings 22 that horizontally extend and penetrate through the large head section 12 and the small head section 13 are provided. As Figures 7 - 8 shown, when welding the large head section 11, the flat attachment ring 21 is sleeved from the small head section 13 onto the outer surface of the middle section 11 near the large head section 12 and is flatly attached, and the positioning ring 22 extends out of the port of the middle section 11. Then, as Figure 10 shown, the large head section 12 is sleeved into the positioning ring 22, and the coaxial positioning of the large head end of the large head section 12 and the middle section 11 can be achieved. Similarly, when welding the small head section 13, as Figures 9 - 10 shown, the sleeving and positioning are carried out in the same manner.

[0028] After the large head section 12 and the small head section 13 are sleeved and positioned through the positioning ring 22 above, it blocks the welding joints between the two and the middle section 11. Therefore, to solve this problem, as Figure 6 shown, at the joints of each of the flat attachment rings 21 and the positioning rings 22, spot welding holes 2a are circumferentially spaced and opened. After the above-mentioned sleeving and positioning, through the spot welding holes 2a, both the large head section 12 and the small head section 13 can be spot welded to the ports of the middle section 11. After the spot welding is completed, the flat attachment rings 21 and the positioning rings 22 are detached from the middle section 11 in the reverse direction, and then the circumferential complete repair welding operation is carried out.

[0029] When the large head section 12 and the small head section 13 are threaded through the positioning ring 22 above, there will be a threading gap, which will affect the coaxiality of the positioning. Therefore, as Figure 11As shown, the inner wall surface of each of the positioning rings 22 is provided with a conical structure. This structure enables the large head section 12 and the small head section 13 to achieve contact positioning with the inner wall of the positioning ring 22 near the port of the middle section 11 after passing through the positioning ring 22. This not only facilitates the insertion of the large head section 12 and the small head section 13, but also realizes coaxial positioning after contact. In addition, the relatively large inner port of the positioning ring 22 also facilitates the insertion of the large head section 12 and the small head section 13.

[0030] Furthermore, to facilitate the sleeving of the flat attachment ring 21 onto the middle section 11, preferably, as Figure 12 shown, the flat attachment ring 21 and the positioning ring 22 are arranged as a hinged structure that can be opened in half. This facilitates the quick sleeving of the flat attachment ring 21 at the port of the middle section 11. At the same time, after the above spot welding operation, the solder of the spot welding will affect the disassembly of the positioning ring 22 from the middle section 11, and the hinged opening structure also facilitates the disassembly of the flat attachment ring 21 and the positioning ring 22 from the middle section 11 after spot welding.

[0031] The principle of this application is as follows: When performing the welding operation of the large head section 12 and the small head section 13 to the middle section 11, first, the flat attachment ring 21 and the positioning ring 22 are hinged open, then directly sleeved near the port of the middle section 11, and the flat attachment ring 21 can be flatly attached to the circumferential surface of the middle section 11 along the circumferential direction. Then, the large head section 12 and the small head section 13 are respectively inserted into the positioning rings 22 on each side, and spot welding operations are carried out through the spot welding holes 2a. After the electric welding is completed, the flat attachment ring 21 and the positioning ring 22 are hinged open, and then circumferential repair welding is carried out to complete the coaxial welding operation of the large and small head forgings.

[0032] The above shows and describes the basic principle, main features and advantages of this application. Without departing from the spirit and scope of this application, this application will also have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed.

Claims

1. A welding and forming device for a reducing titanium pipe fitting. The reducing titanium pipe fitting has an intermediate section (11) with different diameters at both ends, and a large head section (12) and a small head section (13) which are located at both ends of the intermediate section (11) and have a straight cylinder structure. It is characterized in that: The reducing titanium pipe fitting is of a split structure. The welding and forming device coaxially connects the ports where the middle section (11) is connected to the large head section (12), and at the same time coaxially connects the ports where the middle section (11) is connected to the small head section (13), and the welding and forming device is detachably connected to the middle section (11), the large head section (12) and the small head section (13). The welding and forming device includes flat attachment rings (21) sequentially sleeved and attached to the outer surfaces of the middle section (11) near both ports. At the outer ends of each flat attachment ring (21), positioning rings (22) horizontally extending and positioning and passing through the large head section (12) and the small head section (13) are provided.

2. The welding forming device according to claim 1, characterized in that: At the joints of each flat attachment ring (21) and the positioning ring (22), spot welding holes (2a) are circumferentially spaced and opened.

3. The welding forming device according to claim 2, wherein: The inner wall surface of each positioning ring (22) is provided with a conical surface structure.

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