Welding positioning device and welding method for inclined pipe flange

Abstract

The invention belongs to the technical field of welding auxiliary structures, and discloses a welding positioning device for an inclined pipe flange and a welding method. The welding positioning device for the inclined pipe flange comprises two parallel positioning arms, a mounting groove body is formed between the two positioning arms, and an inclined pipe can be positioned and mounted in the mounting groove body; the two sides, in the first direction, of the two positioning arms are each provided with a first step part and a second step part. The first step parts of the two positioning arms form a first mounting table surface, and the first mounting table surface is used for limiting and mounting a first flange; and the second step parts of the two positioning arms form a second mounting table surface, and the second mounting table surface is used for limiting and mounting a second flange. The production steps are simplified, and the production efficiency, the finished product precision and the finished product percent of pass are improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding auxiliary structures, and in particular to a welding positioning device and a welding method for an inclined pipe flange. Background Art

[0002] The welding of the inclined pipe flange is the welding of the flanges at both ends of the pipe with an inclined angle. Since the inclined pipe is in an inclined state, a certain error may be formed during the welding process, whether during assembly or welding, so that the shape and position tolerance of the inclined pipe flange does not meet the design requirements. Especially for the inclined pipe flange with high precision requirements, the precision in the welding process is particularly important.

[0003] In the prior art, the welding accuracy of the bevel tube flange is usually improved by changing the welding sequence between the various positions of the flange and the bevel tube and the post-welding shaping process. However, there are many uncontrollable factors in the above method, including not only the connection positioning between the bevel tube and the flange, but also shrinkage during the welding process. This results in poor consistency of the finished bevel tube flange and a high product scrap rate.

[0004] Therefore, there is an urgent need for a welding positioning device and a welding method for an inclined pipe flange to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a welding positioning device for an inclined pipe flange, which can simplify the production steps and improve the production efficiency, the precision of the finished product and the qualified rate of the finished product.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A welding positioning device for an inclined tube flange, the inclined tube flange comprising an inclined tube, a first flange and a second flange, wherein the first flange and the second flange are respectively arranged at two ends of the inclined tube along its own axial direction; the welding positioning device for the inclined tube flange comprises two parallel positioning arms, a mounting groove is formed between the two positioning arms, and the inclined tube can be positioned and installed in the mounting groove;

[0008] The two positioning arms are provided with a first step portion and a second step portion on both sides along the first direction;

[0009] The first step portions of the two positioning arms form a first mounting surface, and the first mounting surface is used for limiting the mounting of the first flange;

[0010] The second step portions of the two positioning arms form a second mounting surface, and the second mounting surface is used for limiting the mounting of the second flange.

[0011] Optionally, the distance between the first mounting surface and the second mounting surface is greater than the shortest distance between the two ends of the inclined tube.

[0012] Optionally, the distance between the first mounting surface and the second mounting surface is L1, the shortest distance between the two ends of the inclined tube is L2, and 0.4 mm ≤ L1 - L2 ≤ 0.5 mm.

[0013] Optionally, the first step portion is provided with a plurality of first positioning holes, and the first positioning holes and the first flange are connected via a first limiting pin;

[0014] The second step portion is provided with a plurality of second positioning holes, and the second positioning holes and the second flange are connected via second limiting pins.

[0015] Optionally, the position accuracy of the first positioning hole is Δ1, the position accuracy of the second positioning hole is Δ2, and Δ1=Δ2=0.15 mm.

[0016] Optionally, it also includes a carrying arm, the two ends of which are respectively connected to the two positioning arms and are arranged perpendicular to the positioning arms to block the installation groove on either side along the second direction and form an installation opening on the other side, and the second direction is perpendicular to the first direction.

[0017] Optionally, two surfaces of the bearing arm along the first direction are bearing surfaces, and the two bearing surfaces are respectively arranged flush with the first mounting surface and the second mounting surface.

[0018] Optionally, each of the positioning arms is elastically provided with a clamping portion on one side facing the mounting groove body, and the two clamping portions can radially limit the inclined tube.

[0019] The object of the present invention is to provide a welding method for an inclined pipe flange, which can simplify the production steps and improve the production efficiency, the precision of the finished product and the qualified rate of the finished product.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] The welding method of the inclined tube flange uses the above-mentioned welding positioning device for the inclined tube flange to position and install the above-mentioned inclined tube flange; the welding method of the above-mentioned inclined tube flange includes the following steps:

[0022] S10, installing the oblique tube to the installation groove, so that the oblique tube is clamped and fixed by the clamping part;

[0023] S20, positioning and installing the first flange on the first installation surface, and positioning and installing the second flange on the second installation surface;

[0024] S30, sequentially welding the first flange and the oblique tube once, and welding the second flange and the oblique tube once;

[0025] S40, sequentially performing secondary welding on the first flange and the oblique tube, and performing secondary welding on the second flange and the oblique tube.

[0026] Optionally, the primary welding position in step S30 is a connection between the first flange and the inner ring of the above-mentioned inclined tube and a connection between the second flange and the inner ring of the above-mentioned inclined tube;

[0027] The secondary welding positions in step S40 are the connection between the first flange and the outer ring of the above-mentioned inclined tube and the connection between the second flange and the outer ring of the above-mentioned inclined tube.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a welding positioning device and a welding method for an inclined tube flange. By adopting two parallel positioning arms, the installation groove between the two positioning arms is used to position the inclined tube; the first step portions of the two positioning arms form a first installation table surface to position and install the first flange; the second step portions of the two positioning arms form a second installation table surface to position and install the second flange, thereby improving the connection position accuracy between the inclined tube and the first flange and the second flange, and also providing the first flange and the second flange with a limit and installation space so that they will not extend out of the welding positioning device. At the same time, a certain supporting force is also provided to the first flange and the second flange, thereby improving the shrinkage problem of the first flange and the second flange after being respectively welded to the inclined tube, and improving the position accuracy of the welded inclined tube flange. In addition, there is no need to perform a shaping process after the inclined tube flange is welded, which simplifies the manufacturing steps, improves the production efficiency, and has a high qualified rate of finished products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an axonometric view from one perspective of a welding positioning device for an inclined pipe flange provided in a specific embodiment of the present invention;

[0031] Figure 2 It is an axonometric view from another perspective of a welding positioning device for an inclined pipe flange provided in a specific embodiment of the present invention;

[0032] Figure 3 It is an axonometric view of a welding positioning device for an oblique pipe flange provided by a specific embodiment of the present invention after the oblique pipe flange is loaded;

[0033] Figure 4 It is an axonometric view from another perspective of the welding positioning device for the oblique pipe flange provided by the specific embodiment of the present invention after the oblique pipe flange is loaded;

[0034] Figure 5 It is a front view of the welding positioning device for the oblique tube flange provided by the specific embodiment of the present invention after being loaded with the oblique tube flange.

[0035] In the figure:

[0036] 10. Positioning arm; 11. First step portion; 12. Second step portion;

[0037] 101, mounting tank; 102, first mounting table; 103, second mounting table; 104, first positioning hole; 105, second positioning hole;

[0038] 20. load-bearing arm; 21. load-bearing surface;

[0039] 210, inclined pipe; 220, first flange; 230, second flange. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] Refer to the following Figures 1 to 5 The invention introduces a welding positioning device and a welding method for an inclined pipe flange.

[0045] It should be noted that the first direction is Figures 1 to 5 The X direction in the second direction is Figures 1 to 4 In the Y direction, the X direction is perpendicular to the Y direction, and both the X direction and the Y direction are horizontal directions, which are perpendicular to the vertical direction.

[0046] This embodiment provides a welding positioning device for an inclined tube flange, which is used to weld and fix the flange of the inclined tube 210 .

[0047] Please refer to Figures 3 to 5 The oblique tube flange includes an oblique tube 210, a first flange 220 and a second flange 230, and the first flange 220 and the second flange 230 are respectively arranged at two ends of the oblique tube 210 along its own axial direction. Since the axis of the oblique tube 210 is inclined, when the first flange 220 and the second flange 230 are respectively welded and fixed to the oblique tube 210, problems such as inaccurate positioning and inaccurate welding positions are likely to occur, which affects the position accuracy of the formed oblique tube flange.

[0048] Please refer to Figure 1 and Figure 2 In order to solve the above technical problems, specifically, the welding positioning device for the inclined tube flange includes two parallel positioning arms 10, and a mounting groove 101 is formed between the two positioning arms 10, and the inclined tube 210 can be positioned and installed in the mounting groove 101; the two positioning arms 10 are provided with a first step portion 11 and a second step portion 12 on both sides along the first direction; the first step portions 11 of the two positioning arms 10 form a first mounting table 102, and the first mounting table 102 is used for limiting the installation of the first flange 220; the second step portions 12 of the two positioning arms 10 form a second mounting table 103, and the second mounting table 103 is used for limiting the installation of the second flange 230.

[0049] The welding positioning device for the inclined tube flange in this embodiment adopts two parallel positioning arms 10, so that the installation groove 101 between the two positioning arms 10 is used to position the inclined tube 210; the first step portions 11 of the two positioning arms 10 form a first installation table 102 to position and install the first flange 220; the second step portions 12 of the two positioning arms 10 form a second installation table 103 to position and install the second flange 230, thereby improving the connection position accuracy between the inclined tube 210 and the first flange 220 and the second flange 230, and also providing the first flange 220 and the second flange 230 with a limited position and installation space so that they will not extend out of the welding positioning device. At the same time, it also provides a certain supporting force for the first flange 220 and the second flange 230, improves the shrinkage problem of the first flange 220 and the second flange 230 after being welded to the inclined tube 210, and improves the position accuracy of the welded inclined tube flange. In addition, there is no need to perform a shaping process after the inclined tube flange is welded, which simplifies the manufacturing steps, improves the production efficiency, and has a high qualified rate of finished products.

[0050] Specifically, the first step portion 11 and the second step portion 12 are respectively formed by slots at both ends of the positioning arm 10, that is, two accommodating grooves are formed to facilitate the installation of the first flange 220 and the second flange 230 respectively, thereby accommodating, positioning and limiting the above structure, facilitating the installation of operators and improving installation reliability.

[0051] Optionally, the distance between the first mounting table 102 and the second mounting table 103 is greater than the shortest distance between the two ends of the inclined tube 210. This arrangement further improves the support force for the first flange 220 and the second flange 230, and further improves the shrinkage problem after the first flange 220 and the second flange 230 are respectively welded to the inclined tube 210.

[0052] Further optionally, the distance between the first mounting table 102 and the second mounting table 103 is L1, the shortest distance between the two ends of the inclined tube 210 is L2, and 0.4mm≤L1-L2≤0.5mm. This is a better selection range to avoid severe shrinkage after welding and not cause a problem of too large difference in welding position.

[0053] Furthermore, the first step portion 11 is provided with a plurality of first positioning holes 104 , and the first positioning holes 104 and the first flange 220 are connected by a first limiting pin; so that the position of the first flange 220 can be fixed by the cooperation of the first limiting pin and the first positioning hole 104 , thereby ensuring the position accuracy of the first flange 220 .

[0054] Similarly, the second step portion 12 is provided with a plurality of second positioning holes 105, and the second positioning holes 105 and the second flange 230 are connected by a second limiting pin; the position of the second flange 230 can be fixed by the cooperation of the second limiting pin and the second positioning hole 105, thereby ensuring the position accuracy of the second flange 230.

[0055] Specifically, the first flange 220 and the second flange 230 are each provided with a plurality of fixing holes, and at least two first positioning holes 104 are provided. The relative position between the two first positioning holes 104 is determined by the position between the two fixing holes on the first flange 220 to ensure that the first positioning holes 104 and the position correspond one-to-one with the fixing holes, thereby improving the installation accuracy of the first flange 220.

[0056] Optionally, the position accuracy of the first positioning hole 104 is Δ1, the position accuracy of the second positioning hole 105 is Δ2, and Δ1=Δ2=0.15 mm, which ensures that the positioning accuracy of the fixing holes of the first flange 220 and the second flange 230 meets the requirements.

[0057] Please continue to refer to Figure 1 and Figure 2 In this embodiment, the welding device for the inclined tube flange further includes a bearing arm 20, the two ends of which are respectively connected to the two positioning arms 10 and are arranged perpendicularly to the positioning arms 10, so as to block any one side of the installation slot 101 along the second direction, and form an installation opening on the other side, and the second direction is perpendicular to the first direction. The bearing arm 20 is arranged to carry the first flange 220 or the second flange 230. That is, when the first flange 220 is placed on the first installation table 102, part of it will extend out of the first installation table 102, and similarly, when the second flange 230 is placed on the second installation table 103, part of it will extend out of the second installation table 103, so that the bearing arm 20 carries the extended part of the first flange 220 and the second flange 230 to assist the positioning arm 10 in installation. In addition, the bearing arm 20 also blocks one side of the installation slot 101, realizes the limit of the inclined tube 210, and improves the installation accuracy and auxiliary welding accuracy of the welding positioning device for the inclined tube flange.

[0058] Specifically, the two surfaces of the bearing arm 20 along the first direction are bearing surfaces 21, and the two bearing surfaces 21 are respectively arranged flush with the first mounting table 102 and the second mounting table 103, so that they can better cooperate with the first mounting table 102 or the second mounting table 103 to achieve a better supporting effect for the first flange 220 or the second flange 230.

[0059] The support of the above-mentioned installation slot 101 to the inclined tube 210 is limited only by the bearing arm 20. Further, each positioning arm 10 is elastically provided with a clamping part on one side facing the installation slot 101, and the two clamping parts can radially limit the inclined tube 210, thereby limiting the inclined tube 210.

[0060] Specifically, the two clamping parts are connected to each other or the distance between them is small. After the inclined tube 210 is installed, the clamping part is elastically compressed on one side of the installation groove body 101, which gives elastic pressure to the clamping part to achieve clamping and fixing of the inclined tube 210.

[0061] More specifically, the clamping portion is an arc-shaped structure to fit the wall of the inclined tube 210 .

[0062] Optionally, a protective member is provided on the clamping portion to prevent the clamping portion from damaging the closing of the oblique tube 210. It should be noted that the protective member can be a structure such as silica gel, which is not specifically limited here.

[0063] Furthermore, an elastic member is provided between the clamping portion and the positioning arm 10 to realize elastic connection between the clamping portion and one side of the mounting slot 101. Optionally, the elastic member is an elastic structure such as a spring, which is not specifically limited here.

[0064] Please continue to refer to Figures 1 to 5 This embodiment also provides a method for welding an inclined tube flange, which uses the welding positioning device for an inclined tube flange described in any of the above schemes to position and install the inclined tube flange; the method for welding an inclined tube flange comprises the following steps:

[0065] Step S10 , installing the oblique tube 210 to the installation slot 101 , so that the oblique tube 210 is clamped and fixed by the clamping part; thereby the installation and positioning of the oblique tube 210 is achieved.

[0066] After step S10 , the method further includes step S20 , positioning and installing the first flange 220 on the first installation surface 102 , and positioning and installing the second flange 230 on the second installation surface 103 , so as to realize the installation of the first flange 220 and the second flange 230 .

[0067] Specifically, the first flange 220 and the first mounting table 102 are connected by the first limiting pin passing through the fixing hole and the first positioning hole 104 in sequence.

[0068] Similarly, the second flange 230 and the second mounting table 103 are connected by the second limiting pin passing through the fixing hole and the second positioning hole 105 in sequence.

[0069] Step S20 is followed by step S30, in which the first flange 220 and the inclined tube 210 are welded once, and the second flange 230 and the inclined tube 210 are welded once in sequence; thus, the inclined tube 210 and the two flanges are pre-welded and fixed.

[0070] Specifically, after the first flange 220 and the oblique tube 210 are welded once, the welding positioning device for the oblique tube flange is turned over, and the second flange 230 and the oblique tube 210 are welded once.

[0071] Optionally, the primary welding position in step S30 is the inner ring connection between the first flange 220 and the inclined tube 210 and the inner ring connection between the second flange 230 and the inclined tube 210, so as to achieve full welding of the inner rings of the inclined tube 210 and the two flanges.

[0072] After step S30, step S40 is also included, in which the first flange 220 and the outer ring connection of the inclined tube 210 are welded again, and the second flange 230 and the outer ring connection of the inclined tube 210 are welded again in sequence; thus, the inclined tube 210 and the two flanges are finally welded and fixed.

[0073] Optionally, the secondary welding position in step S40 is the connection between the first flange 220 and the outer ring of the inclined tube 210 and the connection between the second flange 230 and the outer ring of the inclined tube 210, so as to realize welding between the inclined tube 210 and the outer rings of the two flanges.

[0074] Specifically, the secondary welding only needs to be performed as a partial welding, and there is no need to perform a full welding.

[0075] Since the welding positioning device for the inclined tube flange blocks one side of the outer periphery of the inclined tube 210, specifically, the first flange 220 and the outer ring connection of the inclined tube 210 are welded twice toward the position of the installation opening, and the second flange 230 and the outer ring connection of the inclined tube 210 are welded twice toward the position of the installation opening; then the wedge flange is removed from the welding positioning device for the inclined tube flange, or the limit pin is removed and rotated, and then the first flange 220 and the outer ring connection of the inclined tube 210 are welded twice toward the position of the load-bearing arm 20, and the second flange 230 and the outer ring connection of the inclined tube 210 are welded twice toward the position of the load-bearing arm 20; the welding and fixation of the inclined tube flange can be completed.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A welding positioning device for an inclined tube flange, the inclined tube flange comprising an inclined tube (210), a first flange (220) and a second flange (230), wherein the first flange (220) and the second flange (230) are respectively arranged at two ends of the inclined tube (210) along its own axial direction; characterized in that: It comprises two positioning arms (10) arranged in parallel, a mounting groove (101) is formed between the two positioning arms (10), and the inclined tube (210) can be positioned and mounted in the mounting groove (101); The two positioning arms (10) are provided with a first step portion (11) and a second step portion (12) on both sides along the first direction; The first step portions (11) of the two positioning arms (10) form a first mounting surface (102), and the first mounting surface (102) is used for limiting the mounting of the first flange (220); The second step portions (12) of the two positioning arms (10) form a second mounting surface (103), and the second mounting surface (103) is used for limiting the mounting of the second flange (230).

2. The welding positioning device for the inclined pipe flange according to claim 1, characterized in that: The distance between the first mounting surface (102) and the second mounting surface (103) is greater than the shortest distance between the two ends of the inclined tube (210).

3. The welding positioning device for the inclined pipe flange according to claim 2, characterized in that: The distance between the first mounting surface (102) and the second mounting surface (103) is L1, the shortest distance between the two ends of the inclined tube (210) is L2, and 0.4 mm ≤ L1-L2 ≤ 0.5 mm.

4. The welding positioning device for the inclined pipe flange according to claim 1, characterized in that: The first step portion (11) is provided with a plurality of first positioning holes (104), and the first positioning holes (104) and the first flange (220) are connected via a first limiting pin; The second step portion (12) is provided with a plurality of second positioning holes (105), and the second positioning holes (105) and the second flange (230) are connected via a second limiting pin.

5. The welding positioning device for the inclined pipe flange according to claim 4, characterized in that: The position accuracy of the first positioning hole (104) is Δ1, and the position accuracy of the second positioning hole (105) is Δ2, where Δ1=Δ2=0.15 mm.

6. The welding positioning device for the inclined pipe flange according to claim 1, characterized in that: It also includes a carrying arm (20), the two ends of which are respectively connected to the two positioning arms (10) and are arranged perpendicular to the positioning arms (10) to block the installation slot (101) on either side along a second direction and form a mounting opening on the other side, wherein the second direction is perpendicular to the first direction.

7. The welding positioning device for the inclined pipe flange according to claim 6, characterized in that: Two surfaces of the bearing arm (20) along the first direction are bearing surfaces (21), and the two bearing surfaces (21) are respectively arranged flush with the first mounting surface (102) and the second mounting surface (103).

8. The welding positioning device for the inclined pipe flange according to claim 1, characterized in that: A clamping portion is elastically provided on one side of each positioning arm (10) facing the installation slot body (101), and the two clamping portions can radially limit the inclined tube (210).

9. A welding method for an inclined pipe flange, characterized in that: The inclined tube flange is positioned and installed using the welding positioning device for the inclined tube flange as described in claims 1 to 8; the welding method of the inclined tube flange comprises the following steps: S10, installing the oblique tube (210) to the installation slot (101), so that the oblique tube (210) is clamped and fixed by the clamping part; S20, positioning and installing the first flange (220) on the first installation surface (102), and positioning and installing the second flange (230) on the second installation surface (103); S30, sequentially welding the first flange (220) and the oblique tube (210) once, and welding the second flange (230) and the oblique tube (210) once; S40: performing secondary welding on the first flange (220) and the oblique tube (210) in sequence, and performing secondary welding on the second flange (230) and the oblique tube (210).

10. The welding method of the inclined pipe flange according to claim 9, characterized in that: The primary welding position in step S30 is the connection between the first flange (220) and the inner ring of the inclined tube (210) and the connection between the second flange (230) and the inner ring of the inclined tube (210); The secondary welding positions in step S40 are the connection points between the first flange (220) and the outer ring of the inclined tube (210) and the connection points between the second flange (230) and the outer ring of the inclined tube (210).

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