Welding auxiliary device and welding method of shell ring and arc-shaped piece

Abstract

The invention provides a welding auxiliary device and a welding method of a shell ring and an arc-shaped piece, and relates to the technical field of welding, the welding auxiliary device is used for assisting welding of the shell ring and the arc-shaped piece, and the welding auxiliary device comprises a supporting structure and a roundness correction structure; one end of the roundness correction structure is connected with the supporting structure, and the other end of the roundness correction structure is used for being attached to the arc-shaped piece in the welding process of the shell ring and the arc-shaped piece; the roundness correction structure is set to be telescopic; in the welding process of the shell ring and the arc-shaped piece, the supporting structure is fixed to the working platform, the welding auxiliary device is used for correcting the ovality of the shell ring by adjusting the telescopic length of the roundness correcting structure, the advantages of being easy to install and low in dismantling difficulty are achieved, and then the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding auxiliary device, a cylinder section and a welding method for an arc-shaped piece. Background Art

[0002] In the production process of heavy machinery such as nuclear power stainless steel containers, welding the arc-shaped parts to the inner wall of the cylinder segment is an important assembly step. However, during the welding process of the cylinder segment and the arc-shaped parts, due to the thermal expansion characteristics of the cylinder segment and the arc-shaped parts and the unevenness of the welding heat input, the cylinder segment often undergoes elliptical deformation. This elliptical deformation not only affects the assembly accuracy of subsequent components, but also makes it difficult to meet the strict product manufacturing tolerance requirements.

[0003] In the related art, during the welding process of cylinder segments and arcs, a circular holding ring aid is generally set on the outside of the cylinder segment as a welding auxiliary device to control the ovality. Since the holding ring aid needs to be directly welded to the outer wall of the cylinder segment, the installation of the holding ring aid is relatively difficult, and after welding is completed, the holding ring aid needs to be cut before it can be removed, which makes removal difficult and reduces production efficiency.

[0004] Therefore, in the related art, during the welding process of the cylinder segment and the arc, the control of the ovality of the cylinder segment is difficult to install and remove, which leads to the problem of low production efficiency. Summary of the invention

[0005] The problem solved by the invention is: in the process of welding cylinder segments and arcs, how to design a welding auxiliary device with low installation and removal difficulty to control the ovality of the cylinder segments, thereby improving production efficiency.

[0006] In order to solve the above problems, the present invention provides a welding auxiliary device, a cylinder segment and a welding method of an arc-shaped member.

[0007] In a first aspect, the present invention provides a welding auxiliary device for assisting the welding of a cylinder segment and an arc-shaped member, the welding auxiliary device comprising a supporting structure and a rounding structure;

[0008] One end of the rounding structure is connected to the supporting structure, and the other end of the rounding structure is used to fit with the arc-shaped part during the welding process of the cylinder segment and the arc-shaped part;

[0009] The rounding structure is configured to be retractable; during the welding process of the cylinder segment and the arc-shaped member, the support structure is fixed on a working platform, and the welding auxiliary device is used to correct the ovality of the cylinder segment by adjusting the telescopic length of the rounding structure.

[0010] Optionally, the support structure comprises a first support frame and a second support frame which are symmetrically arranged, and the circle alignment structure comprises a first circle alignment substructure connected to the first support frame and a second circle alignment substructure connected to the second support frame;

[0011] The first circle alignment substructure includes a first telescopic structure and a first cushion block, wherein one end of the first telescopic structure is fixed to the first support frame, the other end of the first telescopic structure is fixed to a surface of the first cushion block, and the first cushion block is used to fit with the arc-shaped member;

[0012] The second rounding substructure includes a second telescopic structure and a second cushion block, wherein one end of the second telescopic structure is fixed to the second support frame, the other end of the second telescopic structure is fixed to a surface of the second cushion block, and the second cushion block is used to fit with the arc-shaped member.

[0013] Optionally, the first cushion block and the second cushion block are made of stainless steel material, the first telescopic structure includes one or more carbon steel mechanical jacks, and the second telescopic structure includes one or more carbon steel mechanical jacks.

[0014] Optionally, the first support frame comprises a first movable frame, a first handle pad and a second handle pad, wherein the first handle pad and the second handle pad are used to be fixed on the working platform, the first movable frame is a door-shaped frame, and the two ends of the lower side of the first movable frame are movably connected to the first handle pad and the second handle pad respectively;

[0015] The second supporting frame includes a second movable frame, a third handle pad and a fourth handle pad, wherein the third handle pad and the fourth handle pad are used to be fixed on the working platform, the second movable frame is a door-type frame, and the two ends of the lower side of the second movable frame are respectively movably connected to the third handle pad and the fourth handle pad.

[0016] Optionally, the welding auxiliary device further includes a connecting rod, and two ends of the connecting rod are movably connected to the upper end of the first movable frame and the upper end of the second movable frame respectively.

[0017] In a second aspect, the present invention provides a method for welding a cylinder segment and an arc-shaped member, comprising:

[0018] Placing the cylinder segment on a working platform, and placing the arc-shaped member on the inner wall welding area of ​​the cylinder segment, wherein the arc-shaped side surface of the cylinder segment contacts the working platform;

[0019] A welding auxiliary device is installed on the working platform, wherein the welding auxiliary device is a welding auxiliary device according to any one of claims 1 to 5, and the welding auxiliary device comprises a supporting structure and a rounding structure;

[0020] The barrel section and the arc-shaped member are welded, and the welding auxiliary device is used to correct the ovality of the barrel section during the welding process.

[0021] Optionally, the support structure comprises a first support frame and a second support frame that are symmetrically arranged, the circle alignment structure comprises a first circle alignment substructure connected to the first support frame and a second circle alignment substructure connected to the second support frame, the first circle alignment substructure comprises a first telescopic structure and a first cushion block, and the second circle alignment substructure comprises a second telescopic structure and a second cushion block;

[0022] The installation of the welding auxiliary device on the work platform includes: determining the spacing distance according to the diameter of the cylinder section; installing the first support frame and the second support frame on the work platform according to the spacing distance; installing the first circle alignment substructure under the first support frame, and installing the second circle alignment substructure under the second support frame; adjusting the length of the first telescopic structure in the first circle alignment substructure so that the first pad in the first circle alignment substructure fits with the arc-shaped part; adjusting the length of the second telescopic structure in the second circle alignment substructure so that the second pad in the second circle alignment substructure fits with the arc-shaped part.

[0023] Optionally, the welding auxiliary device further comprises a connecting rod, the first supporting frame comprises a first movable frame, a first closing pad block and a second closing pad block, and the second supporting frame comprises a second movable frame, a third closing pad block and a fourth closing pad block;

[0024] The step of installing the first support frame and the second support frame on the working platform according to the spacing distance comprises: fixing the first and second combination pads on the working platform, fixing the third and fourth combination pads on the working platform, the distance between the first and third combination pads being the spacing distance, and the distance between the second and fourth combination pads being the spacing distance; adjusting the relative angle between the first movable frame and the second movable frame; and fixing the two ends of the connecting rod to the upper end of the first movable frame and the upper end of the second movable frame, respectively.

[0025] Optionally, the welding of the cylinder segment and the arc-shaped member uses the welding auxiliary device to correct the ovality of the cylinder segment during the welding process, including: dividing the welding area of ​​the cylinder segment and the arc-shaped member into N welding sub-areas, and performing welding operations on the N welding sub-areas in sequence according to a preset welding order; after completing each welding operation of the welding sub-area, measuring the ovality of the cylinder segment; when the ovality meets a preset condition, adjusting the telescopic length of the rounding structure to correct the ovality of the cylinder segment.

[0026] Optionally, the welding area of ​​the cylinder section and the arc-shaped part is divided into N welding sub-areas, and the N welding sub-areas are welded in sequence according to a preset welding order, including: dividing the arc-shaped part into three sections along the arc length direction to obtain N welding sub-areas, wherein the N welding sub-areas include 2 middle section welding sub-areas, 4 edge section welding sub-areas and 2 straight section welding sub-areas; each layer performs welding operations on the N welding sub-areas in the order of the middle section welding sub-area, the edge section welding sub-area and the straight section welding sub-area.

[0027] The beneficial effects of the welding auxiliary device of the present invention are as follows: the welding auxiliary device provided in the present invention includes a supporting structure and a rounding structure, which does not need to be welded to the outer wall of the cylinder segment. It only needs to place the supporting structure on the work platform, adjust the position and adjust the telescopic length of the rounding structure to make the rounding structure fit the arc-shaped part. During the welding process, the ovality of the cylinder segment can be controlled and adjusted by extending the rounding structure. The installation is simple. After completing the welding of the arc-shaped part and the cylinder segment, it is only necessary to remove the auxiliary device to achieve dismantling. There is no need to cut the welding auxiliary device. Compared with setting a circular holding ring auxiliary tool on the outside of the cylinder segment, the welding auxiliary device in this embodiment has the advantages of simple installation and low difficulty in dismantling, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cylinder segment and the arc-shaped member after welding in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a welding auxiliary device in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the use of the welding auxiliary device in the welding process of the cylinder section and the arc-shaped member in the embodiment of the present invention;

[0031] Figure 4 It is a structural schematic diagram of a welding auxiliary device in another embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a welding auxiliary device in another embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the process of welding the cylinder segment and the arc-shaped member in an embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of installing a welding auxiliary device when welding a cylinder segment and an arc-shaped member in an embodiment of the present invention;

[0035] Figure 8 Schematic diagram of welding shrinkage deformation of the cylinder section during welding in an embodiment of the present invention;

[0036] Fig. 9 It is the welding area of ​​the cylinder segment and the arc-shaped member in the embodiment of the present invention;

[0037] Fig.10 Schematic diagram of the welding sub-area in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Welding auxiliary device; 11. Support structure; 111. First support frame; 1111. First movable frame; 1112. First handle gasket; 1113. Second handle gasket; 112. Second support frame; 1121. Second movable frame; 1122. Third handle gasket; 1123. Fourth handle gasket; 12. Rounding structure; 121. First rounding substructure; 1211. First telescopic structure; 1212. First gasket; 122. Second rounding substructure; 1221. Second telescopic structure; 1222. Second gasket; 13. Connecting rod; 2. Cylinder section; 21. Long weld; 22. Straight weld; 3. Arc-shaped part; 4. Working platform. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0041] It should also be noted that the meanings of the Y-axis and X-axis described below are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0042] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0043] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0044] The schematic diagram of the welding of the cylinder segment and the arc-shaped part is as follows: Figure 1 As shown, the arc-shaped piece is placed on the inner wall of the cylinder segment, and the arc-shaped piece and the inner wall of the cylinder segment are closely fitted and fixed by welding. During the welding process of the arc-shaped piece and the cylinder segment, the thermal expansion characteristics of the cylinder segment and the arc-shaped piece and the unevenness of the welding heat input often cause the cylinder segment to have an elliptical deformation.

[0045] In the related art, a circular holding ring aid is arranged on the outside of the cylinder segment as a welding auxiliary device to control the ovality. Since the holding ring aid needs to be directly close to the outer wall of the cylinder segment, the holding ring aid needs to match the diameter of the cylinder segment. Different sizes of holding ring aids are required for cylinder segments with different diameters. It can be seen that the single holding ring aid in the related art is difficult to be applied to cylinder segments of different sizes, and the holding ring aid must be tightly fitted with the outer wall of the cylinder segment during installation, which makes the installation difficult. If the holding ring aid is installed to the outer wall of the cylinder segment by welding, it will inevitably cause elliptical deformation of the cylinder segment, and after the welding of the cylinder segment and the arc-shaped part is completed, the holding ring aid needs to be cut before it can be removed, which makes removal difficult, thereby reducing production efficiency.

[0046] In view of the problems existing in the above-mentioned related technologies, the present invention provides a welding auxiliary device, a welding method for a cylinder segment and an arc-shaped member.

[0047] Combination Figure 2 As shown, an embodiment of the present invention provides a welding auxiliary device for assisting the welding of a cylinder segment 2 and an arc-shaped member 3. The welding auxiliary device 1 includes a supporting structure 11 and a rounding structure 12;

[0048] One end of the rounding structure 12 is connected to the supporting structure 11, and the other end of the rounding structure 12 is used to fit with the arc-shaped member 3 during the welding process of the cylinder segment 2 and the arc-shaped member 3;

[0049] The rounding structure 12 is configured to be retractable; during the welding process of the cylinder segment 2 and the arc-shaped member 3 , the support structure 11 is fixed on the working platform 4 , and the welding auxiliary device 1 is used to correct the ovality of the cylinder segment 2 by adjusting the telescopic length of the rounding structure 12 .

[0050] Specifically, this embodiment provides a welding auxiliary device 1, such as Figure 2 The supporting structure 11 and the rounding structure 12 are shown, and one end of the rounding structure 12 is connected to the supporting structure 11 .

[0051] Figure 3 The schematic diagram of the welding auxiliary device 1 in the welding process of the cylinder section 2 and the arc-shaped member 3 is shown in FIG. Figure 3 As shown, during the welding process of the cylinder section 2 and the arc-shaped member 3, the support structure 11 in the welding auxiliary device 1 is fixed on the working platform 4 to provide stable support for the rounding structure 12, and the welding auxiliary device 1 does not move during the welding process; one end of the rounding structure 12 is connected to the support frame, and the other end of the rounding structure 12 is adjusted by the telescopic adjustment of the rounding structure 12 during the welding process of the cylinder section 2 and the arc-shaped member 3 so as to fit with the arc-shaped member 3.

[0052] During the welding process of the arc-shaped member 3 and the cylinder segment 2, welding shrinkage deformation will occur, causing the ovality of the cylinder segment 2 to change. However, after the welding auxiliary device 1 is set, if the cylinder segment 2 produces shrinkage deformation, the cylinder segment 2 can be expanded outward by extending the rounding structure 12 in the welding auxiliary device 1, thereby correcting the ovality change of the cylinder segment 2 caused by welding.

[0053] The welding auxiliary device 1 provided in the present embodiment does not need to be welded to the outer wall of the cylinder segment 2. It only needs to place the supporting structure 11 on the working platform 4, adjust the position and the telescopic length of the rounding structure 12, so that the rounding structure 12 fits the arc-shaped member 3. During the welding process, the ovality of the cylinder segment 2 can be controlled and adjusted by extending the rounding structure 12. The installation is simple. After the welding of the arc-shaped member 3 and the cylinder segment 2 is completed, it is only necessary to remove the auxiliary device to achieve dismantling. There is no need to cut the welding auxiliary device 1. Compared with setting a circular holding ring auxiliary tool on the outside of the cylinder segment 2, the welding auxiliary device 1 in the present embodiment has the advantages of simple installation and low difficulty in dismantling, thereby improving production efficiency.

[0054] Alternatively, if Figure 4 As shown, the support structure 11 includes a first support frame 111 and a second support frame 112 that are symmetrically arranged, and the circle alignment structure 12 includes a first circle alignment substructure 121 connected to the first support frame 111 and a second circle alignment substructure 122 connected to the second support frame 112;

[0055] The first circle alignment substructure 121 includes a first telescopic structure 1211 and a first cushion block 1212, wherein one end of the first telescopic structure 1211 is fixed to the first support frame 111, and the other end of the first telescopic structure 1211 is fixed to one surface of the first cushion block 1212, and the first cushion block 1212 is used to fit with the arc-shaped member 3;

[0056] The second circle alignment substructure 122 includes a second telescopic structure 1221 and a second cushion block 1222, wherein one end of the second telescopic structure 1221 is fixed to the second support frame 112, and the other end of the second telescopic structure 1221 is fixed to a surface of the second cushion block 1222, and the second cushion block 1222 is used to fit with the arc-shaped member 3.

[0057] Specifically, the support structure 11 is divided into two parts: a first support frame 111 and a second support frame 112, and the circle alignment structure 12 is also divided into two parts: a first circle alignment substructure 121 and a second circle alignment substructure 122, wherein the first support frame 111 and the first circle alignment substructure 121 are connected into a whole, and the second support frame 112 and the second circle alignment substructure 122 are connected into a whole.

[0058] Each rounding substructure includes a telescopic structure and a pad, that is, the first rounding substructure 121 includes a first telescopic structure 1211 and a first pad 1212, and the second rounding substructure 122 includes a second telescopic structure 1221 and a second pad 1222. The telescopic structure aligns the cylinder segment 2 by applying an outward force to the cylinder segment 2 by extending. The pad is connected to the telescopic structure and fits with the arc-shaped member 3, and the arc-shaped member 3 is fit on the cylinder segment 2, so that during the rounding process of applying external force to the telescopic structure, the cylinder segment 2 is evenly stressed in the width direction of the arc-shaped member 3.

[0059] Optionally, the first cushion block 1212 and the second cushion block 1222 are made of stainless steel, the first telescopic structure 1211 includes one or more carbon steel mechanical jacks, and the second telescopic structure 1221 includes one or more carbon steel mechanical jacks.

[0060] Specifically, the first cushion block 1212 and the second cushion block 1222 are made of stainless steel, and the telescopic structure is composed of one or more carbon steel mechanical jacks. The carbon steel mechanical jacks are telescopic and rigid, and can provide external force to prevent the cylinder segment 2 from shrinking or to expand the cylinder segment 2 outward to achieve rounding of the cylinder segment 2 when the cylinder segment 2 shrinks inward.

[0061] However, the mechanical jack is made of carbon steel, and direct contact with the arc part 3 will cause contamination to the arc part 3. Since a stainless steel pad is connected between the jack and the arc part 3, the contact between the carbon steel mechanical jack and the arc part 3 is isolated, thereby avoiding contamination of the arc part 3, especially when the arc part 3 is made of stainless steel, it is ensured that the arc part 3 is not contaminated by the carbon steel material.

[0062] Preferably, the length of the stainless steel pad is consistent with the width of the arc-shaped member 3 .

[0063] Optionally, the first support frame 111 includes a first movable frame 1111 and two handle pads, wherein the first support frame 111 includes a first movable frame 1111, a first handle pad 1112 and a second handle pad 1113, wherein the first handle pad 1112 and the second handle pad 1113 are used to be fixed on the working platform 4, the first movable frame 1111 is a door-shaped frame, and the two ends of the lower side of the first movable frame 1111 are movably connected to the first handle pad 1112 and the second handle pad 1113 respectively;

[0064] The second supporting frame 112 includes a second movable frame 1121, a third handle pad 1122 and a fourth handle pad 1123, wherein the third handle pad 1122 and the fourth handle pad 1123 are used to be fixed on the working platform 4, and the second movable frame 1121 is a door-type frame, and the two ends of the lower side of the second movable frame 1121 are movably connected to the third handle pad 1122 and the fourth handle pad 1123 respectively.

[0065] Specifically, the first support frame 111 and the second support frame 112 have the same structure, and only the positions in which they are placed during the welding process of the cylinder section 2 and the arc-shaped member 3 are different. One support frame includes a movable frame and two engaging pads, wherein the engaging pads are used to be fixed on the working platform 4. Specifically, the engaging pads can be fixed on the working platform 4 using pad fixing bolts to achieve the fixation of the first support frame 111 and the second support frame 112. The movable frame is movably connected to the two engaging pads, for example, the sliding frame can be hinged to the two engaging pads, and the extension direction of the hinge axis is the same as the axial direction of the cylinder section 2. The movable connection facilitates the adjustment of the relative angles of the two support frames, so that the welding auxiliary device 1 can adapt to cylinder sections 2 of different diameters.

[0066] Alternatively, if Figure 5 As shown, the welding auxiliary device 1 further includes a connecting rod 13, and both ends of the connecting rod 13 are movably connected to the upper end of the first movable frame 1111 and the upper end of the second movable frame 1121 respectively.

[0067] The connecting rod 13 connects the first support frame and the second support frame into a whole. The connecting rod 13 can be connected to the movable frame by the connecting rod 13 bolts. When the connecting rod 13 bolts and the pad fixing bolts are not tightened, the first movable frame 1111, the second movable frame 1121 and the connecting rod 13 can rotate. The installer determines the positions of the first movable frame 1111, the second movable frame 1121 and the connecting rod 13 through manual adjustment. After the position is determined, tighten the connecting rod 13 bolts and the pad fixing bolts to fix the position of the movable frame.

[0068] like Figure 6 As shown, the embodiment of the present invention further provides a welding method for the cylinder segment 2 and the arc-shaped member 3, comprising:

[0069] Step S1 : placing the cylinder segment 2 on the working platform 4 , and placing the arc-shaped member 3 on the inner wall welding area of ​​the cylinder segment 2 , wherein the arc-shaped side surface of the cylinder segment 2 is in contact with the working platform 4 .

[0070] Specifically, when welding of the cylinder section 2 and the arc-shaped member 3 is required, Figure 7 The work platform 4 provided is used for the welding. Before welding, the cylinder section 2 is placed on the work platform 4. Figure 7 As shown, the arcuate side surface of the cylinder segment 2 is in contact with the working platform 4 , and the arcuate outer side surface corresponding to the position where the cylinder segment 2 is welded with the arc-shaped member 3 (ie, the inner wall welding area) faces downward and in contact with the working platform 4 .

[0071] After the cylinder segment 2 is placed on the working platform 4, the arc-shaped member 3 is placed on the welding area of ​​the inner wall of the cylinder segment 2. Preferably, symmetrical spot welding can be performed at two or more points of the welding seam between the arc-shaped member 3 and the inner wall of the cylinder segment 2 to preliminarily fix the arc-shaped member 3 so that the position of the arc-shaped member 3 remains unchanged when the welding auxiliary device 1 is subsequently installed. It should be noted that spot welding has little effect on the deformation of the cylinder segment 2, and the preliminary fixation of the arc-shaped member 3 will not cause excessive deformation of the cylinder segment 2.

[0072] Step S2: installing a welding auxiliary device 1 on the working platform 4 , wherein the welding auxiliary device 1 is the welding auxiliary device 1 as described above, and the welding auxiliary device 1 comprises a supporting structure 11 and a rounding structure 12 .

[0073] Specifically, the arc-shaped member 3 is placed behind the inner welding area of ​​the barrel section 2, as shown in FIG. Figure 7 As shown, the welding auxiliary device 1 as described above is installed so that the welding auxiliary device 1 can be used to correct the ovality of the cylinder section 2 in the subsequent welding process.

[0074] Step S3: welding the barrel section 2 and the arc-shaped member 3 , and using the welding auxiliary device 1 to correct the ovality of the barrel section 2 during the welding process.

[0075] Specifically, when welding the cylinder section 2 and the arc-shaped member 3, the cylinder section 2 will produce welding shrinkage deformation during the welding process, such as Figure 8 As shown, it will generally be in the direction opposite to the arc-shaped member 3 (corresponding to Figure 8 The long axis of the ellipse appears in the direction perpendicular to the facing direction (corresponding to the Z-axis direction in Figure 8 The minor axis of the ellipse appears in the Y-axis direction in the welding process, thereby changing the ellipticity of the cylinder section 2. The welding auxiliary device 1 is used to correct the ellipticity of the cylinder section 2 during the welding process.

[0076] It should be noted that ellipticity = ab, where a is the major axis of the ellipse, b is the minor axis of the ellipse, and a circle is a special ellipse. The ellipticity of a circle is 0. The ellipticity of barrel section 2 changes and is no longer 0. Correcting the ellipticity of barrel section 2 is the process of adjusting barrel section 2 so that the ellipticity of barrel section 2 approaches 0.

[0077] During the welding process of the cylinder segment 2 and the arc-shaped member 3 , the welding auxiliary device 1 adjusts the telescopic length of the rounding structure 12 to expand the cylinder segment 2 outward, thereby reducing the welding shrinkage deformation of the cylinder segment 2 during welding, that is, correcting the ovality of the cylinder segment 2 .

[0078] In this embodiment, when welding of the cylinder section 2 and the arc-shaped member 3 is required, the cylinder section 2 is first placed on the working platform 4, the arc-shaped member 3 is placed in the internal welding area of ​​the cylinder section 2, and the welding auxiliary device 1 is installed. During the welding process, the welding auxiliary device 1 is used to correct the ovality of the cylinder section 2, thereby reducing the influence of the ovality change on the assembly accuracy of subsequent components during the welding process. The welding auxiliary device 1 in this embodiment does not need to be welded to the outer wall of the cylinder section 2. It is only necessary to place the support structure 11 on the working platform 4, adjust the position and adjust the telescopic length of the rounding structure 12, so that the rounding structure 12 fits the arc-shaped member 3. During the welding process, the ovality of the cylinder section 2 can be controlled and adjusted by extending the rounding structure 12. It has the advantages of simple installation and low difficulty in dismantling, thereby improving production efficiency.

[0079] Optionally, the support structure 11 includes a first support frame 111 and a second support frame 112 that are symmetrically arranged, the circle alignment structure 12 includes a first circle alignment substructure 121 connected to the first support frame 111 and a second circle alignment substructure 122 connected to the second support frame 112, the first circle alignment substructure 121 includes a first telescopic structure 1211 and a first cushion block 1212, and the second circle alignment substructure 122 includes a second telescopic structure 1221 and a second cushion block 1222;

[0080] The method of installing the welding auxiliary device 1 on the working platform 4 includes: determining a spacing distance according to the diameter of the cylinder section 2; installing the first support frame 111 and the second support frame 112 on the working platform 4 according to the spacing distance; installing the first circle alignment substructure 121 under the first support frame 111, and installing the second circle alignment substructure 122 under the second support frame 112; adjusting the length of the first telescopic structure 1211 in the first circle alignment substructure 121 so that the first cushion block 1212 in the first circle alignment substructure 121 fits with the arc-shaped member 3; adjusting the length of the second telescopic structure 1221 in the second circle alignment substructure 122 so that the second cushion block 1222 in the second circle alignment substructure 122 fits with the arc-shaped member 3.

[0081] Specifically, when installing the auxiliary welding tool, first determine the fixed positions of the first support frame and the second support frame on the work platform 4. The distance between the first support frame and the second support frame is the spacing distance, which is determined by the diameter of the cylinder section 2, and the two support frames are both in the centripetal direction. After fixing the first support frame 111 and the second support frame 112, install the first circle correction substructure 121 and the second circle correction substructure 122. The first circle correction substructure 121 is installed under the first support frame 111, and the second circle correction substructure 122 is installed under the second support frame 112. Then adjust the lengths of the first telescopic structure 1211 and the second telescopic structure 1221 so that the first cushion block 1212 and the second cushion block 1222 fit the arc-shaped member 3.

[0082] Preferably, the first cushion block 1212 , the second cushion block 1222 and the arc-shaped member 3 have the same width.

[0083] Optionally, the welding auxiliary device 1 further includes a connecting rod 13, the first supporting frame 111 includes a first movable frame 1111, a first closing pad block 1112 and a second closing pad block 1113, and the second supporting frame 112 includes a second movable frame 1121, a third closing pad block 1122 and a fourth closing pad block 1123;

[0084] The method of installing the first support frame 111 and the second support frame 112 on the working platform 4 according to the spacing distance includes: fixing the first and second closing pads 1112 and 1113 on the working platform 4, fixing the third and fourth closing pads 1122 and 1123 on the working platform 4, the distance between the first and third closing pads 1112 and 1122 being the spacing distance, and the distance between the second and fourth closing pads 1113 and 1123 being the spacing distance; adjusting the relative angle between the first movable frame 1111 and the second movable frame 1121; fixing the two ends of the connecting rod 13 to the upper end of the first movable frame 1111 and the upper end of the second movable frame 1121, respectively.

[0085] Specifically, the first support frame 111 includes a movable frame and two handle pads, that is, the first support frame 111 includes a first movable frame 1111, a first handle pad 1112 and a second handle pad 1113. The second support frame 112 has a similar structure to the first support frame 111, and also includes a movable frame and two handle pads, that is, the second support frame 112 includes a second movable frame 1121, a third handle pad 1122 and a fourth handle pad 1123.

[0086] When fixing the first support frame 111 and the second support frame 112, first fix the handle pads of each support frame. Specifically, the first handle pad 1112 and the second handle pad 1113 are respectively fixed on both sides of the cylinder section 2, and the third handle pad 1122 and the fourth handle pad 1123 are respectively fixed on both sides of the cylinder section 2, and the distance between the first handle pad 1112 and the third handle pad 1122 is the above-mentioned spacing distance, and the distance between the second handle pad 1113 and the fourth handle pad 1123 is the above-mentioned spacing distance.

[0087] The movable frame is movably connected to the corresponding handlebar pad, and the movable frame can adjust the angle. Preferably, the movable frame and the handlebar pad are connected by frame fixing bolts. When the frame fixing bolts are not tightened, the movable frame can move relative to the handlebar pad, so as to adjust the relative angle between the movable frames so that the two movable frames are symmetrically arranged and are both in the centripetal direction.

[0088] After adjusting the relative angle between the two movable frames, the connecting rod 13 is fixed to the upper ends of the first movable frame 1111 and the second movable frame 1121 to achieve the connection between the two movable frames and further maintain the stability of the movable frames.

[0089] Optionally, the welding of the barrel section 2 and the arc-shaped member 3, and correcting the ovality of the barrel section 2 using the welding auxiliary device 1 during the welding process, comprises:

[0090] Divide the welding area of ​​the barrel section 2 and the arc-shaped member 3 into N welding sub-areas, and perform welding operations on the N welding sub-areas in sequence according to a preset welding sequence;

[0091] After each welding operation of the welding sub-area is completed, measuring the ovality of the barrel section 2;

[0092] When the ovality satisfies a preset condition, the telescopic length of the rounding structure 12 is adjusted to correct the ovality of the barrel section 2;.

[0093] Specifically, the welding area between the cylinder segment 2 and the arc-shaped member 3 is as follows: Fig. 9 As shown, the welding area includes a long weld 21 along the arc length direction and a straight section weld 22.

[0094] The welding area of ​​the cylinder section 2 and the arc-shaped member 3 is divided into N welding sub-areas, including two long welds and two straight welds, and the long welds are further segmented. For example, each long weld is divided into 3 sections, and the straight weld is shorter and can be selected without segmentation, resulting in a total of 8 welding sub-areas. In another example, each long weld is divided into 4 sections, and the straight weld is shorter and can be selected without segmentation, resulting in a total of 10 welding sub-areas.

[0095] The N divided welding sub-areas are welded in sequence according to a preset welding order. After each welding sub-area is welded, the ovality of the cylinder section 2 is measured. When the ovality meets the preset conditions, the telescopic length of the rounding structure 12 in the welding auxiliary device 1 is adjusted to correct the ovality of the cylinder section 2.

[0096] The ellipticity meeting the preset condition may be that the ellipticity is not 0, or that the ellipticity is greater than a preset threshold. For example, when the ellipticity needs to be controlled within 2 mm, the preset threshold can be set to 2 mm. When the ellipticity, that is, the difference between the major and minor axes, is greater than 2 mm, it is determined that the ellipticity meets the preset condition.

[0097] Optionally, dividing the welding area of ​​the barrel section 2 and the arc-shaped member 3 into N welding sub-areas, and sequentially performing welding operations on the N welding sub-areas according to a preset welding sequence includes:

[0098] The arc-shaped member 3 is divided into three sections along the arc length direction to obtain N welding sub-areas, wherein the N welding sub-areas include 2 middle section welding sub-areas, 4 edge section welding sub-areas and 2 straight section welding sub-areas; each layer performs welding operations on the N welding sub-areas in the order of the middle section welding sub-areas, the edge section welding sub-areas and the straight section welding sub-areas.

[0099] When the workpiece is divided into three sections along the arc length direction, two middle section welding sub-areas, four edge section welding sub-areas and two straight section welding sub-areas are obtained, a total of eight welding sub-areas, such as Fig.10 As shown, Fig.10 Middle weld 1 and weld 2 correspond to the above-mentioned two middle section welding sub-areas, weld 3, weld 4, weld 5 and weld 6 correspond to the above-mentioned four edge section welding sub-areas, weld 7 and weld 8 correspond to the above-mentioned two straight section welding sub-areas, and the welding operation is performed according to the welding order of the middle section welding sub-area, the edge section welding sub-area, and the straight section welding sub-area (i.e., the preset welding order).

[0100] The welding sequence is exemplarily: weld 1, weld 2, weld 3, weld 4, weld 5, weld 6, weld 7, weld 8. It should be noted that the welding sequence of weld 1 and weld 2 can be interchanged, the welding sequence of weld 3 and weld 4 can be interchanged, the welding sequence of weld 5 and weld 6 can be interchanged, and the welding sequence of weld 7 and weld 8 can be interchanged.

[0101] It should be noted that multi-layer welding is performed on each welding sub-area, single-layer welding is performed on all welding sub-areas according to a preset welding sequence, and then the next layer of welding is performed according to the preset welding sequence.

[0102] It should be noted that the arc length direction can be divided into more segments, such as 4 segments, 5 segments, etc. The welds in the arc length direction are welded first, and then the welds are welded from both ends of the middle phase in sequence. After the welds in the arc length direction are completed, the straight section welds (i.e., the straight section welding sub-area) are welded.

[0103] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A welding auxiliary device, characterized in that: The welding auxiliary device (1) is used to assist in welding a cylinder segment (2) and an arc-shaped member (3), and the welding auxiliary device (1) comprises a supporting structure (11) and a rounding structure (12); One end of the rounding structure (12) is connected to the supporting structure (11), and the other end of the rounding structure (12) is used to fit with the arc-shaped member (3) during the welding process of the cylinder segment (2) and the arc-shaped member (3); The rounding structure (12) is configured to be retractable; during the welding process of the cylinder section (2) and the arc-shaped member (3), the support structure (11) is fixed on the working platform (4), and the welding auxiliary device (1) is used to correct the ovality of the cylinder section (2) by adjusting the telescopic length of the rounding structure (12).

2. The welding auxiliary device according to claim 1, characterized in that: The support structure (11) comprises a first support frame (111) and a second support frame (112) which are symmetrically arranged, and the circle alignment structure (12) comprises a first circle alignment substructure (121) connected to the first support frame (111) and a second circle alignment substructure (122) connected to the second support frame (112); The first rounding substructure (121) comprises a first telescopic structure (1211) and a first cushion block (1212), wherein one end of the first telescopic structure (1211) is fixed to the first supporting frame (111), and the other end of the first telescopic structure (1211) is fixed to a surface of the first cushion block (1212), and the first cushion block (1212) is used to fit with the arc-shaped member (3); The second rounding substructure (122) comprises a second telescopic structure (1221) and a second cushion block (1222), wherein one end of the second telescopic structure (1221) is fixed to the second supporting frame (112), and the other end of the second telescopic structure (1221) is fixed to a surface of the second cushion block (1222), and the second cushion block (1222) is used to fit with the arc-shaped member (3).

3. The welding auxiliary device according to claim 2, characterized in that: The first cushion block (1212) and the second cushion block (1222) are made of stainless steel material, the first telescopic structure (1211) includes one or more carbon steel mechanical jacks, and the second telescopic structure (1221) includes one or more carbon steel mechanical jacks.

4. The welding auxiliary device according to claim 2, characterized in that: The first supporting frame (111) comprises a first movable frame (1111), a first closing pad block (1112) and a second closing pad block (1113), wherein the first closing pad block (1112) and the second closing pad block (1113) are used to be fixed on the working platform (4), the first movable frame (1111) is a door-shaped frame, and the two ends of the lower side of the first movable frame (1111) are movably connected to the first closing pad block (1112) and the second closing pad block (1113) respectively; The second supporting frame (112) comprises a second movable frame (1121), a third handle pad (1122) and a fourth handle pad (1123), wherein the third handle pad (1122) and the fourth handle pad (1123) are used to be fixed on the working platform (4), the second movable frame (1121) is a door-type frame, and the two ends of the lower side of the second movable frame (1121) are movably connected to the third handle pad (1122) and the fourth handle pad (1123) respectively.

5. The welding auxiliary device according to claim 4, characterized in that: The welding auxiliary device (1) further comprises a connecting rod (13), the two ends of which are movably connected to the upper end of the first movable frame (1111) and the upper end of the second movable frame (1121), respectively.

6. A method for welding a cylinder segment and an arc-shaped member, characterized in that: include: Placing the cylinder segment (2) on a working platform (4), and placing the arc-shaped member (3) on the inner wall welding area of ​​the cylinder segment (2), wherein the arc-shaped side surface of the cylinder segment (2) is in contact with the working platform (4); A welding auxiliary device (1) is installed on the working platform (4), wherein the welding auxiliary device (1) is a welding auxiliary device (1) according to any one of claims 1 to 5, and the welding auxiliary device (1) comprises a supporting structure (11) and a rounding structure (12); The cylinder section and the arc-shaped member (3) are welded, and during the welding process, the welding auxiliary device (1) is used to correct the ovality of the cylinder section (2).

7. The welding method of the cylinder segment and the arc-shaped member according to claim 6, characterized in that: The support structure (11) comprises a first support frame (111) and a second support frame (112) which are symmetrically arranged; the circle alignment structure (12) comprises a first circle alignment substructure (121) connected to the first support frame (111) and a second circle alignment substructure (122) connected to the second support frame (112); the first circle alignment substructure (121) comprises a first telescopic structure (1211) and a first cushion block (1212); the second circle alignment substructure (122) comprises a second telescopic structure (1221) and a second cushion block (1222); The welding auxiliary device (1) is installed on the working platform (4), comprising: Determining the spacing distance according to the diameter of the barrel section (2); Installing a first support frame (111) and a second support frame (112) on the working platform (4) at the spacing distance; Installing a first circle alignment substructure (121) under the first supporting frame (111), and installing a second circle alignment substructure (122) under the second supporting frame (112); Adjusting the length of the first telescopic structure (1211) in the first circle alignment substructure (121) so that the first cushion block (1212) in the first circle alignment substructure (121) fits the arc-shaped member (3); The length of the second telescopic structure (1221) in the second rounding substructure (122) is adjusted so that the second cushion block (1222) in the second rounding substructure (122) fits the arc-shaped member (3).

8. The welding method of the cylinder segment and the arc-shaped member according to claim 7, characterized in that: The welding auxiliary device (1) further comprises a connecting rod (13); the first supporting frame (111) comprises a first movable frame (1111), a first closing pad block (1112) and a second closing pad block (1113); the second supporting frame (112) comprises a second movable frame (1121), a third closing pad block (1122) and a fourth closing pad block (1123); The step of installing the first support frame (111) and the second support frame (112) on the working platform (4) at the spacing distance comprises: The first handle pad (1112) and the second handle pad (1113) are fixed on the working platform (4), and the third handle pad (1122) and the fourth handle pad (1123) are fixed on the working platform (4), wherein the distance between the first handle pad (1112) and the third handle pad (1122) is the spacing distance, and the distance between the second handle pad (1113) and the fourth handle pad (1123) is the spacing distance; Adjusting the relative angle between the first movable frame (1111) and the second movable frame (1121); The two ends of the connecting rod (13) are respectively fixed to the upper end of the first movable frame (1111) and the upper end of the second movable frame (1121).

9. The welding method of a cylinder segment and an arc-shaped member according to claim 6, characterized in that: The welding of the cylinder section (2) and the arc-shaped member (3), using the welding auxiliary device (1) to correct the ovality of the cylinder section (2) during the welding process, comprises: Dividing the welding area of ​​the cylinder section (2) and the arc-shaped member (3) into N welding sub-areas, and sequentially performing welding operations on the N welding sub-areas according to a preset welding sequence; After each welding operation of the welding sub-area is completed, measuring the ovality of the cylinder section (2); When the ovality satisfies a preset condition, the telescopic length of the rounding structure (12) is adjusted to correct the ovality of the barrel section (2).

10. The welding method of the cylinder segment and the arc-shaped member according to claim 9, characterized in that: The step of dividing the welding area of ​​the cylinder section (2) and the arc-shaped member (3) into N welding sub-areas and sequentially performing welding operations on the N welding sub-areas according to a preset welding sequence comprises: The arc-shaped member (3) is divided into three sections along the arc length direction to obtain N welding sub-regions, wherein the N welding sub-regions include 2 middle section welding sub-regions, 4 edge section welding sub-regions and 2 straight section welding sub-regions; In each layer, welding operations are performed on the N welding sub-regions in sequence according to the middle section welding sub-region, the edge section welding sub-region, and the straight section welding sub-region.

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