Stainless steel storage box scalloped segment tailor-welding tool

Abstract

The utility model provides a stainless steel storage box scalloped segment tailor-welding tool. The stainless steel storage box scalloped segment tailor-welding tool comprises at least one scalloped segment clamping device and a scalloped segment support. Each group of scalloped segment clamping device comprises two inner and outer tire devices which are correspondingly arranged; the inner tire and outer tire device comprises an inner tire molded surface and an outer tire frame, the inner tire molded surface is used for supporting the inner side face of a scalloped segment workpiece, and the outer tire frame is used for pressing the scalloped segment workpiece to the inner tire molded surface from the outer side face of the scalloped segment workpiece; the scalloped segment support is an annular support and comprises an upper support and a lower support, the upper support is used for supporting the upper end of a scalloped segment workpiece, and the lower support is used for supporting the lower end of the scalloped segment workpiece; the two inner and outer tire devices are used for clamping the first scalloped segment workpiece and the second scalloped segment workpiece correspondingly so as to weld the first scalloped segment workpiece and the second scalloped segment workpiece. The tailor-welding tool can improve the assembly quality of scalloped segment workpieces and control the length of welded scalloped segment rings.

Description

Technical Field

[0001] The utility model relates to the field of the processing of the bottom of the aerospace rocket storage tank, and particularly relates to a stainless steel storage tank segment welding and assembling tooling. Background Art

[0002] Domestic aerospace rocket storage tanks are mainly made of aluminum alloy materials, and there is no precedent for stainless steel storage tanks. Some foreign rockets have adopted stainless steel storage tanks, such as the Atlas D rocket, the Centaur D and G rockets of the United States, and the StarShip of Space X. The strength of stainless steel materials is lower than that of aluminum alloy materials, but their welding performance is excellent and the cost is relatively low. In addition, research shows that in the liquid oxygen low-temperature area of -196°C, the strength of stainless steel after cryogenic strain strengthening technology is equivalent to that of aluminum-lithium alloy. For example, commercial aerospace companies such as SpaceX that pursue cost performance are all trying to develop rocket storage tanks made of stainless steel materials. The welding methods already applied to foreign rocket stainless steel storage tanks are laminated resistance welding, and some use laser welding. There is no processing of storage tanks in the form of butt welding. The assembly requirements of laminated welding are lower than those of laser butt welding, but the strength of the same laminated weld is lower than that of butt welding.

[0003] In order to improve the butt joint assembly quality of stainless steel segments and realize the circumferential welding of segments in a stainless steel storage tank, it is particularly important to design a stainless steel storage tank segment welding and assembling tooling. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a stainless steel storage tank segment welding and assembling tooling.

[0005] The utility model provides a stainless steel storage tank segment welding and assembling tooling, which includes: at least one group of segment clamping devices and segment supports; each group of the segment clamping devices includes two corresponding inner and outer tire devices; the inner and outer tire devices include an inner tire profile and an outer tire frame. The inner tire profile is used to support the inner side of the segment workpiece, and the outer tire frame is used to press the segment workpiece to the inner tire profile from the outer side of the segment workpiece; the segment support is a circular ring support, which includes an upper support and a lower support. The upper support is used to support the upper end of the segment workpiece, and the lower support is used to support the lower end of the segment workpiece; the two inner and outer tire devices are used to clamp the first segment workpiece and the second segment workpiece respectively, so as to weld the first segment workpiece and the second segment workpiece.

[0006] According to an embodiment of the utility model, the inner and outer tire devices further include a base linear slide; the inner tire profile and the outer tire frame are arranged on the base linear slide, and the outer tire frame is rotatably connected with the base linear slide so as to rotate towards or away from the inner tire profile.

[0007] According to an embodiment of the present utility model, the inner and outer tire device further includes an outer tire driving cylinder; one end of the outer tire driving cylinder is connected to the base linear slide, and the other end is connected to the outer side surface of the outer tire frame to push or pull the outer tire frame to rotate towards or away from the inner tire profile.

[0008] According to an embodiment of the present utility model, at least one set of piano key pressing devices are respectively arranged on the parts of the two outer tire frames close to each other, and the piano key pressing device is used to press the segment workpiece against the inner tire profile corresponding to the outer tire frame.

[0009] According to an embodiment of the present utility model, retractable positioning pins are correspondingly arranged at the upper and lower ends of the outer side surface of the inner tire profile, and the retractable positioning pins are used to cooperate with the segment workpiece to position the segment workpiece.

[0010] According to an embodiment of the present utility model, the upper bracket includes an upper bracket base and a rubber wheel, and the rubber wheel is rotatably arranged at the top end of the upper bracket base; the lower bracket includes a lower bracket base and a roller wheel, and the roller wheel is rotatably arranged at the top end of the lower bracket base; the rubber wheel and the roller wheel are respectively used to support the upper end surface and the lower end surface of the segment workpiece, and cooperate with the rotation of the segment workpiece to rotate circumferentially along the segment bracket.

[0011] According to an embodiment of the present utility model, a perimeter tire is arranged at the top end of the lower bracket, and the inner side surface of the segment workpiece is placed in contact with the perimeter tire.

[0012] According to an embodiment of the present utility model, an arc segment pressing device is further arranged at the top end of the lower bracket, and the arc segment pressing device includes an arc segment driving cylinder and a pressing arc segment block; one end of the arc segment driving cylinder is connected to the lower bracket, and the other end is connected to the pressing arc segment block to push the pressing arc segment block towards the segment workpiece to press the segment workpiece against the perimeter tire, or pull the pressing arc segment block away from the segment workpiece.

[0013] According to an embodiment of the present utility model, the base linear slide includes a slide base and a slide, the slide is arranged on the upper end surface of the slide base, and the inner and outer tire device is arranged on the slide; the slide can slide relative to the slide base to drive the inner and outer tires and the segment workpiece to perform circumferential fine adjustment around the segment bracket.

[0014] According to an embodiment of the present utility model, a radial linear slide is arranged on the slide, and the radial linear slide includes a perimeter tire short arc plate that can slide relative to the slide along the radial direction of the segment bracket; the perimeter tire short arc plate abuts against the inner side surface of the segment workpiece by moving towards the segment workpiece.

[0015] According to the stainless steel petal welding fixture of the present utility model, the first petal workpiece and the second petal workpiece are clamped by two inner and outer tire devices respectively to cut and weld the first petal workpiece and the second petal workpiece, and the welded petal workpiece is supported by an annular petal bracket, which can solve the problems of butt joint assembly of stainless steel petals and control of petal ring length.

[0016] It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and cannot limit the scope claimed by the present utility model. Brief Description of the Drawings

[0017] The following drawings are part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The attached drawings and the description of the specification are used together to explain the principle of the utility model.

[0018] Figure 1 is a perspective view of the stainless steel petal welding fixture according to an embodiment of the present utility model;

[0019] Figure 2 is a side view of the stainless steel petal welding fixture according to an embodiment of the present utility model;

[0020] Figure 3 is a perspective view of the inner and outer tire device according to an embodiment of the present utility model;

[0021] Figure 4 is a side view of the inner and outer tire device according to an embodiment of the present utility model;

[0022] Figure 5 is a schematic diagram of a single petal workpiece according to an embodiment of the present utility model;

[0023] Figure 6 is Figure 5 a sectional view taken along the line B-B in;

[0024] Figure 7 is a schematic diagram of a petal ring welded by using the welding fixture according to an embodiment of the present utility model;

[0025] Figure 8 is a perspective view of the petal bracket according to an embodiment of the present utility model;

[0026] Figure 9 is a perspective view of the arc pressing device according to an embodiment of the present utility model;

[0027] Figure 10 is a perspective view of the radial linear slide according to an embodiment of the present utility model;

[0028] Figure 11 is a perspective view of the follower bearing wheel according to an embodiment of the present utility model;

[0029] Figure 12 is a perspective view of a robot cutting and welding system according to an embodiment of the present utility model.

[0030] Description of reference numerals:

[0031] 1 - upper clamping device; 2 - key pressing device; 3 - laser cutting head; 4 - robot system; 5 - outer tire frame; 6 - radial linear slide; 7 - rotary bearing seat; 8 - outer tire drive cylinder; 9 - base linear slide; 10 - perimeter tire; 11 - perimeter tire pin hole; 12 - rubber wheel; 13 - arc segment drive cylinder; 14 - upper support base; 15 - segmented workpiece; 16 - lower support base; 17 - roller wheel; 18 - telescopic positioning pin; 19 - inner tire profile; 20 - inner tire steel structure frame; 21 - follower bearing wheel; 22 - outer pressing short arc plate; 23 - perimeter tire short arc plate; 24 - short arc plate drive cylinder; 25 - pressing arc segment block; 26 - laser welding head. Detailed implementation manners

[0032] The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. To make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present utility model and are used to exemplarily illustrate the principle of the present utility model, and are not configured to limit the present utility model. In addition, the components in the drawings are not necessarily drawn to scale. For example, the dimensions of some components or regions in the drawings may be enlarged for other components or regions to help understand the embodiments of the present utility model.

[0033] The orientation terms appearing in the following description are all the directions shown in the drawings and do not limit the specific structure of the embodiments of the present utility model. In the description of the present utility model, it should be noted that unless otherwise specified, the terms "installed", "connected", and "connected" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In addition, the terms "including", "comprising", "having" or any other variant thereof are intended to cover non-exclusive inclusion, such that a series of elements, structures or components includes not only those elements but also other elements not explicitly listed or inherent to the structures or components. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the articles or devices including the elements.

[0035] Spatial relationship terms such as "below", "beneath", "under", "lower", "above", "on", "higher", etc. are used to facilitate description and to explain the positioning of one element relative to a second element. These terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. Additionally, for example, "one element is on / under another element" can mean that the two elements are in direct contact or that there are other elements between the two elements. Furthermore, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and do not particularly refer to an order or sequence, and should not be construed as limiting. Similar terms denote similar elements throughout the description.

[0036] In the process of describing the present utility model hereinafter, in certain scenario descriptions, only "rocket", "launch vehicle", "spacecraft", "space launch vehicle" or "missile" may be used. This is merely for convenience of description, and its connotation is not limited to the specific words used. Generally, the rockets of the present utility model include both launch vehicles or space launch vehicles for carrying satellites, spacecraft or other detectors, and various missiles, rockets and other weapons for carrying military payloads, as well as similar products capable of sending payloads into the air. Those skilled in the art should not limit the rocket to only one of the launch vehicle or missile according to the specific words used in the description scenario, so as to narrow the protection scope of the present utility model.

[0037] For those skilled in the art, the present utility model can be implemented without some of these specific details. The following description of the embodiments is only provided to better understand the present utility model by showing examples of the present utility model.

[0038] Figure 1 is a perspective view of a stainless steel segment welding tooling according to an embodiment of the present utility model; Figure 2 is a side view of a stainless steel segment welding tooling according to an embodiment of the present utility model; Figure 3 is a perspective view of an inner and outer tire device according to an embodiment of the present utility model; Figure 4 is a side view of an inner and outer tire device according to an embodiment of the present utility model; Figure 5 is a schematic view of a single segment workpiece according to an embodiment of the present utility model; Figure 6 is Figure 5 a sectional view taken along the B-B direction in Figure 7 is a schematic view of a segment ring welded using the welding tooling according to an embodiment of the present utility model; Figure 8 is a perspective view of a segment bracket according to an embodiment of the present utility model; Figure 9 is a perspective view of an arc pressing device according to an embodiment of the present utility model; Figure 10It is a three-dimensional view of a radial linear slide of an embodiment of the present utility model; Figure 11 It is a three-dimensional view of a follower bearing wheel of an embodiment of the present utility model; Figure 12 It is a three-dimensional view of a robot cutting and welding system of an embodiment of the present utility model.

[0039] As Figure 1 、 2 、3 and 4 show, the present utility model provides a stainless steel storage tank segment welding tooling, including: at least one group of segment clamping devices and segment supports. Each group of segment clamping devices includes two corresponding inner and outer tire devices. The inner and outer tire devices include an inner tire profile 19 and an outer tire frame 5. The inner tire profile 19 is used to support the inner side surface of the segment workpiece 15, and the outer tire frame 5 is used to press the segment workpiece 15 from the outer side surface of the segment workpiece 15 to the inner tire profile 19. The segment support is an annular support, which includes an upper support and a lower support. The upper support is used to support the upper end of the segment workpiece 15, and the lower support is used to support the lower end of the segment workpiece 15. The two inner and outer tire devices are used to clamp the first segment workpiece and the second segment workpiece respectively, so as to weld the first segment workpiece and the second segment workpiece.

[0040] Specifically, the stainless steel storage tank has a greater cost advantage compared with the aluminum alloy storage tank. The main welding methods of domestic storage tanks are friction stir welding and inert gas shielded arc welding, and there is no precedent for laser welding of storage tanks. Although friction stir welding has good application effects in aluminum alloy welding, due to problems such as large welding load and tool wear, its application in high melting point alloys is not yet mature and is not suitable for welding stainless steel storage tanks. Inert gas shielded arc welding has relatively low requirements for assembly quality such as weld gap and misalignment. According to the current assembly method of arc welding processing, the accuracy of the incoming segment workpieces is not high and cannot meet the requirements of laser welding.

[0041] Different from the manual fusion welding or laser overlap welding methods of other stainless steel segments, the welding tooling provided in this embodiment clamps the first segment workpiece and the second segment workpiece respectively through two inner and outer tire devices, so as to cut the first segment workpiece and the second segment workpiece, and can realize welding in the form of butt welds, improving the butt assembly accuracy of stainless steel segments. Through experimental verification, using this welding tooling in combination with laser welding can make the butt gap of the entire longitudinal seam less than 0.1 mm. The strength of the produced stainless steel segment rings is much higher than that of the segments produced by overlap welding and resistance welding under the same volume, making the best use of the strength characteristics of stainless steel materials. In addition, this welding tooling has relatively low requirements for the incoming segment workpieces, the equipment is easy to operate, and key links (such as adjusting the welding position, etc.) can be automated, and the product quality consistency is good. It has been verified that the perimeter fluctuation of the segment rings processed each time by this welding tooling does not exceed one ten-thousandth of the entire perimeter.

[0042] In addition, different from the traditional method of configuring an inner tire tooling for the entire circumference during the processing of the bottom of the storage tank, the welding fixture provided in this embodiment only configures a pair or multiple pairs of segment clamping devices for the segment workpieces to be welded, and the remaining positions are mainly supported by segment brackets, which reduces costs. For example, if only one set of segment clamping devices is configured for the welding fixture, the cost can be reduced to at least less than 1 / 6 of the entire ring tooling. By using the circular segment brackets to support the welded segment workpieces, it is possible to better control the circumference of the segment ring processed, ensure the consistency of the circumferences of the segment rings processed each time, and achieve the welding of the segment rings in the stainless steel storage tank. Different from the traditional working form where the segment workpieces are batch-finished and then transferred to another station for assembly welding, with this welding fixture, each segment workpiece can be welded after being finish-machined. That is, the cutting and welding of the segment workpieces to be welded can be achieved on one set of tooling, and then the cutting and welding of another pair of segment workpieces are carried out, repeating this process until a complete segment ring is formed.

[0043] In this embodiment, the segment clamping device can be spliced with the segment bracket to form a ring to integrally support the segment ring in the storage tank formed by welding the segment workpieces. The two inner and outer tire devices can be arranged in a mirror image or approximately mirror image with respect to their docking sides.

[0044] Furthermore, the outer side of the inner tire profile can be an arc surface adapted to the inner side of the segment workpiece, and the inner side of the outer tire frame can be an arc surface adapted to the outer side of the segment workpiece, which is convenient for clamping the segment workpiece and prevents the deformation of the profile of the segment workpiece.

[0045] According to an embodiment of the present invention, the inner tire profile main body can include an inner tire steel structure frame 20, and the outer tire frame main body can include an outer tire steel structure frame.

[0046] According to an embodiment of the present invention, in addition to the inner tire profile 19 and the outer tire frame 5, the inner and outer tire device further includes a base linear slide 9. The inner tire profile 19 and the outer tire frame 5 are arranged on the base linear slide 9, and the outer tire frame 5 is rotatably connected to the base linear slide 9 to rotate towards or away from the inner tire profile 19.

[0047] According to an embodiment of the present invention, the lower end of the outer tire frame can be rotatably connected to the base linear slide 9 through a rotary bearing seat 7.

[0048] According to an embodiment of the present invention, in addition to the inner tire profile 19 and the outer tire frame 5, the inner and outer tire device further includes a base linear slide 9. The inner tire profile 19 and the outer tire frame 5 are arranged on the base linear slide 9, and the outer tire frame 5 is slidably (such as linearly slidably) connected to the base linear slide 9 to slide towards or away from pressing the inner tire profile 19.

[0049] According to an embodiment of the present utility model, upper clamping devices 1 that cooperate with each other are respectively arranged at the upper ends of the outer tire frame 5 and the inner tire profile 19. The upper clamping device 1 is used to further press the upper ends of the outer tire frame 5 and the inner tire profile 19.

[0050] In this embodiment, the upper clamping device can be pneumatic clamping (such as cylinder drive), electric clamping (such as electric cylinder drive), fastening by cooperation of bolts and nuts, or electric clamping.

[0051] According to an embodiment of the present utility model, in addition to the inner tire profile 19 and the outer tire frame 5, the inner and outer tire device further includes an outer tire drive cylinder 8. One end of the outer tire drive cylinder 8 is connected to the base linear slide 9, and the other end is connected to the outer side surface of the outer tire frame 5 to push or pull the outer tire frame 5 to rotate towards or away from the inner tire profile 19.

[0052] In this embodiment, the outer tire drive cylinder 8 can be a tilting electric cylinder or a hydraulic cylinder. The bottom hinge of the outer tire drive cylinder can be connected to the table surface of the slide by bolts, and the head hinge can be connected to the outer side surface of the outer tire frame by pins. The outer tire drive cylinder 8 can rotate through the drive hinge to control the opening and closing of the outer tire frame in a rotational manner.

[0053] According to an embodiment of the present utility model, at least one set of piano key pressing devices 2 are respectively arranged on the parts of the two outer tire frames 5 close to each other. The piano key pressing device 2 is used to press the segmented workpiece 15 against the inner tire profile 19 corresponding to the outer tire frame 5.

[0054] In this embodiment, by respectively arranging multiple sets of piano key pressing devices on the parts of the two outer tire frames 5 close to each other, it can be ensured that the adjacent areas of the to-be-cut and welded edges of the segmented workpiece are completely attached to the inner tire profile, and the profile accuracy of the segmented workpiece is controlled. The welding tooling determines the installation position of the segmented workpiece through the inner tire profile and the outer tire frame, and controls its profile accuracy. Only by cutting at the required positions can accurate segmented workpieces be obtained.

[0055] The piano key pressing device can be a pneumatic piano key pressing device, which can utilize the lever principle, that is, the cylinder pushes one end of the piano key structural member / pushing rod (such as the lever piano key structure), so that the other end of the piano key structural member / pushing rod rotates around the fulcrum, thereby achieving the pressing effect.

[0056] According to an embodiment of the present utility model, the piano key pressing device includes a drive cylinder (such as a cylinder), a pushing rod, a solenoid valve, and a valve island. The valve island can control the on / off of each air circuit solenoid valve of the piano key pressing device to start in sequence. Under the action of the thrust of their respective cylinders, each lever piano key structural member presses towards the inner tire profile in sequence from top to bottom, making the segmented workpiece closely attached to the inner tire profile.

[0057] According to an embodiment of the present utility model, telescopic positioning pins 18 are correspondingly arranged at the upper and lower ends of the outer side surface of the inner tube profile 19. The telescopic positioning pins 18 are used to cooperate with the segment workpiece 15 to position the segment workpiece 15.

[0058] As Figure 5 , 6 As shown in FIGS. 6 and 7, since the segment workpiece is a thin-walled part with large shape and size errors, during processing, the two pin holes above and below the central axis of the segment workpiece can be used as the processing reference for the segment workpiece. In this embodiment, when the segment workpiece 15 is installed on the inner tube profile 19, the pin holes on the segment workpiece 15 can be utilized to cooperate with the two telescopic positioning pins 18 on the inner tube profile 19 for positioning, which can control the installation position of a single segment workpiece on the inner tube profile 19, achieve accurate positioning, and thus realize the precise assembly and welding between segment workpieces. The telescopic positioning pins 18 can be pneumatic telescopic pins, that is, the extension and retraction of the pins are controlled by a cylinder.

[0059] As Figure 8 shown, according to an embodiment of the present utility model, the upper bracket includes an upper bracket base 14 and a rubber wheel 12. The rubber wheel 12 is rotatably arranged at the top of the upper bracket base 14. The lower bracket includes a lower bracket base 16 and a roller wheel 17. The roller wheel 17 is rotatably arranged at the top of the lower bracket base 16. The rubber wheel 12 and the roller wheel 17 are respectively used to support the upper end surface and the lower end surface of the segment workpiece 15, and cooperate with the segment workpiece 15 to rotate circumferentially along the segment bracket through rotation.

[0060] In this embodiment, the upper bracket and the lower bracket of the segment bracket can be two sets of steel structure brackets with independent bases, that is, the upper bracket base 14 and the lower bracket base 16 are two sets of independent bases. The segment bracket can also be an integral structure bracket processed according to the ellipsoidal surface of the segment. The rubber wheels and the roller wheels can be evenly arranged circumferentially around the upper bracket base and the lower bracket base respectively. Since both the rubber wheels and the roller wheels are rolling parts, the segment workpiece after welding the longitudinal seam can be rotated from the inner and outer tire device to the segment bracket.

[0061] Furthermore, the roller wheel and the rubber wheel can be respectively connected to a driving device. The driving device is used to drive the roller wheel and the rubber wheel to rotate, so as to drive the segment workpiece on the segment bracket to rotate circumferentially around the segment bracket, realizing the automatic rotation of the segment workpiece.

[0062] According to an embodiment of the present utility model, a perimeter tire 10 is arranged at the top of the lower bracket, and the inner side surface of the segment workpiece 15 is placed in contact with the perimeter tire 10.

[0063] Due to the existence of cumulative errors, even if each petal workpiece has been cut and welded as close as possible to the theoretical dimensions, without appropriate correction, the circumference of the finally formed petal ring may exceed the allowable error range. The welding fixture provided in this embodiment controls the circumference of the petal ring by means of the circumference tire provided on the lower bracket, making the petal workpiece fit the circumference tire. Taking the circumference tire as the circumference reference, the longitudinal seams of the petal workpieces are cut and welded one by one, and the cutting allowance on one side of the last petal workpiece can be adjusted, and then the welding of the last weld seam is completed. The welding fixture of the embodiment of the present application controls the circumference of the entire petal ring by setting a circumference tire, and can ensure the consistency of the circumference dimensions of the petal rings (such as large-diameter petal rings) formed by each welding.

[0064] Different from the method of controlling the circumference by relying on the integral inner tire, the welding fixture of this embodiment adopts a non-circular circumference tire and a single inner tire profile to form the circumference reference, which can effectively control the length of the welded petal ring, and the equipment is relatively simple.

[0065] In addition, different from the traditional ellipsoidal petal form, when designing the petal workpiece, on the basis of the original ellipsoidal cross-section of the petal workpiece, the petal workpiece can extend upward to form a conical section and downward to form a cylindrical section. This design structure of the petal is more beneficial to the assembly of the subsequent annular components, and at the same time, the cylindrical section at the lower end is easier to control the circumference than the ellipsoidal section.

[0066] As Figure 9 shown, according to an embodiment of the present invention, an arc segment pressing device is further provided at the top of the lower bracket. The arc segment pressing device includes an arc segment driving cylinder 13 and a pressing arc segment block 25. One end of the arc segment driving cylinder 13 is connected to the lower bracket, and the other end is connected to the pressing arc segment block 25 to push the pressing arc segment block 25 to move towards the petal workpiece x to press the petal workpiece 15 against the circumference tire 10, or to pull the pressing arc segment block 25 away from the petal workpiece 15.

[0067] In this embodiment, the arc segment driving cylinder can be a pneumatic cylinder, an electric cylinder or a hydraulic cylinder. Multiple groups of arc segment pressing devices can be evenly arranged around the circumference of the lower bracket.

[0068] According to an embodiment of the present invention, an arc segment pressing device is further provided at the top of the lower bracket. The arc segment pressing device can be a manual pressing device, including a screw rod and a pressing arc segment block 25. The screw rod is slidably arranged on the upper end surface of the base of the lower bracket, and one end of the screw rod is connected to the pressing arc segment block 25. The screw rod slides relative to the upper end surface of the base of the lower bracket to push the pressing arc segment block 25 to move towards the petal workpiece 15 to press the petal workpiece 15 against the circumference tire 10, or to pull the pressing arc segment block 25 away from the petal workpiece 15.

[0069] In this embodiment, multiple groups of arc segment pressing devices can be evenly arranged around the lower bracket in the circumferential direction to press and fit the lower end of the petal workpiece (such as the cylindrical segment part at the lower end of the petal workpiece) against the circumferential tire side.

[0070] Further, two nuts are arranged at the end of the screw rod close to the pressing arc segment block 25. The pressing arc segment block is provided with a threaded hole, the screw rod penetrates through the threaded hole of the pressing arc segment block, and the two nuts are respectively arranged on both sides of the threaded hole of the pressing arc segment block to limit the relative movement of the pressing arc segment block with respect to the screw rod.

[0071] According to an embodiment of the present invention, a plurality of circumferential tire pin holes 11 (such as circular or oblong pin holes) can be arranged along the circumferential direction of the circumferential tire. After the petal workpiece is placed on the petal bracket, the circumferential tire pin holes 11 are aligned with the pin holes on the lower end face of the petal workpiece, and a through pin can be used to tightly fix the circumferential tire and the petal workpiece.

[0072] In this embodiment, the circumferential tire pin holes arranged on the circumferential tire can be arranged in a cross pattern with the arc segment pressing devices. The pin used to cooperate with the circumferential tire pin holes can be an integral structure with the arc segment pressing devices.

[0073] According to a welding fixture of an embodiment of the present application, the base linear slide 9 includes a slide base and a slide. The slide is arranged on the upper end face of the slide base, and the inner and outer tire device is arranged on the slide. The slide can slide relative to the slide base to drive the inner and outer tires and the petal workpiece 15 to finely adjust circumferentially around the petal bracket.

[0074] In this embodiment, bolt holes can be arranged on the slide table surface, and the inner and outer tire device is fixedly connected to the slide table surface through bolts. After the petal workpiece is installed on the inner and outer tire device, the slide of the base linear slide can push it to the cutting position, and the horizontal movement distance of the slide can be determined according to the cutting allowance.

[0075] Further, a roller length measuring sensor can be used to measure the circumference of the petal ring, providing revised data on how and how much the base linear slide should move during the cutting of the petal.

[0076] According to an embodiment of the present invention, the inside of the base linear slide can be a combination of an electric cylinder and a guide rail slider, a guide rail slider and a motor and a ball screw, or a guide rail slider and a motor and a rack, so as to achieve high-precision repeated positioning of the petal workpiece and can cooperate with a cutting and welding execution mechanism (such as a robot cutting and welding mechanism), thereby ensuring the cutting position of each petal workpiece.

[0077] As Figure 10 shown, according to an embodiment of the present invention, a radial linear slide 6 is arranged on the slide. The radial linear slide 6 includes a circumferential tire short arc plate 23 that can slide relative to the slide along the radial direction of the petal bracket. The circumferential tire short arc plate 23 moves towards the petal workpiece 15 and abuts against the inner side surface of the petal workpiece 15.

[0078] In this embodiment, two radial linear slides can be provided for each set of petal clamping devices, which are respectively arranged on the sides away from each other of the two inner and outer tire devices. After the slides of the two base linear slides move towards each other in place, the radial linear slides push the short arc plate of the circumferential tire towards the petal workpiece to a preset radial position, cooperate with the inner and outer tire devices to complete the circumferential tire, and form a complete circle. In this embodiment, there may be a small gap at the connection position between the short arc plate of the circumferential tire and the circumferential tire, and the missing part of the gap accounts for less than 1% of the circumference of the whole circle. Therefore, it does not affect the consistency of the petal ring circumference. Different from the method of relying on the integral inner tire for circumference control, the welding fixture in this embodiment uses a non-circular circumferential tire, a single inner tire profile, and a movable short arc plate of the circumferential tire to form a circumference reference. At the same time, the method of applying a constant tension can be used to control the shape of the connection gap between the short arc plate of the circumferential tire and the circumferential tire to match the theoretical arc shape.

[0079] In this embodiment, after the short arc plate of the circumferential tire is pushed out by the radial linear slide, the petal workpiece part on the petal bracket can be pressed against the circumferential tire, and then the base linear slide can be controlled to pull the petal workpiece with a constant force to determine the cutting position. The short arc plate of the circumferential tire can be an arc-shaped structural part adapted to the petal workpiece.

[0080] Furthermore, in addition to the short arc plate 23 of the circumferential tire, the radial linear slide 6 further includes an outer pressing short arc plate 22 adapted to the short arc plate 23 of the circumferential tire and a short arc plate driving cylinder 24 cooperating with the outer pressing short arc plate 22.

[0081] In this embodiment, the short arc plate driving cylinder can be a pneumatic turning cylinder (that is, the front end of the pneumatic turning cylinder can turn 90° or a larger angle), and the outer pressing short arc plate can be fixedly connected to the short arc plate driving cylinder 24 through bolts. The short arc plate 23 of the circumferential tire moves towards the petal workpiece 15 and abuts against the inner side surface of the petal workpiece 15. The short arc plate driving cylinder 24 drives the outer pressing short arc plate 22 to turn towards the outer side surface of the petal workpiece and presses the petal workpiece, pressing the lower edge of this section of the petal workpiece onto the short arc plate 23 of the circumferential tire. The lengths of the short arc plate of the circumferential tire and the outer pressing short arc plate can be the same.

[0082] According to an embodiment of the present invention, the radial linear slide 6 can include a radial base fixedly connected to the slide, and the short arc plate of the circumferential tire is slidably connected to the radial base. One end of the short arc plate driving cylinder is fixedly connected to the short arc plate of the circumferential tire, and the other end is fixedly connected to the outer pressing short arc plate (such as fixedly connected through bolts). The petal workpiece is placed between the short arc plate of the circumferential tire and the outer pressing short arc plate, and the short arc plate driving cylinder drives the outer pressing short arc plate to turn towards the short arc plate of the circumferential tire to press the petal workpiece.

[0083] Such as Figure 11As shown, according to one embodiment of the present invention, a follower bearing wheel 21 is provided at the lower end of the inner tube profile 19. The follower bearing wheel 21 includes a spring and a bearing wheel. A U-shaped bracket is provided at the upper end of the spring. The U-shaped bracket is provided with a rotatable bearing wheel. The bearing wheel is used to support the melon slice workpiece 15 and cooperate with the melon slice workpiece 15 to rotate circumferentially along the melon slice bracket.

[0084] Specifically, since the melon slice workpiece is a thin-shell sheet metal part, it is difficult to ensure the consistency of its size, and the size from the pin hole at the lower end of the melon slice workpiece to the lower edge of the melon slice workpiece will fluctuate to a certain extent.

[0085] In this embodiment, the contact area between the lower end of the melon slice workpiece and the inner tube profile is the circumferential surface of the bearing wheel of the follower bearing wheel. The follower bearing wheel can use a spring to achieve follow-up adjustment of the melon slice workpiece in the vertical direction to accommodate the error of the lower edge of the melon slice workpiece relative to the pin hole at the lower end of the melon slice workpiece or the height change of the lower edge of the melon slice workpiece. Unlike the traditional method of manually adding a pad to the lower edge of the melon slice workpiece to accommodate its height deviation, the welding fixture of the present invention supports the melon slice workpiece by providing a follower bearing wheel 21 at the lower end of the inner tube profile. In other words, the weight of the melon slice workpiece is mostly borne by the follower bearing wheel, which not only avoids deformation and damage at the pin hole position of the thin-walled melon slice workpiece, but also solves the problem of dimensional deviation between the pin hole and the lower edge of the melon slice workpiece, and has a higher tolerance for dimensional errors of the melon slice workpiece. At the same time, the follower bearing wheel also facilitates the sliding of the melon slice workpiece relative to the inner tube profile 19.

[0086] Given the delicate nature of thin-walled melon segments, which are prone to deformation, the tailor-welding fixture of this embodiment achieves an assembly level of less than 0.1mm along the entire longitudinal seam of the melon segments through surface control, in-situ cutting, and precise assembly, meeting the requirements of butt welding (e.g., laser butt welding). Furthermore, the welding process settings of this embodiment ensure that the circumference of the melon segment ring processed by the fixture does not fluctuate by more than one ten-thousandth of the total circumference.

[0087] Furthermore, a follower bearing wheel may be provided at each end of the inner tube profile, distributed on both sides of the retractable positioning pin at the lower end.

[0088] According to one embodiment of the present invention, a follower bearing wheel 21 is disposed at the lower end of the inner tube profile 19. The follower bearing wheel 21 comprises a retractable push rod and a bearing wheel. A U-shaped bracket is disposed at the upper end of the retractable push rod, which in turn houses a rotatable bearing wheel. The retractable push rod is axially retractable to control the vertical position of the bearing wheel. The bearing wheel supports the melon slice workpiece 15 and rotates circumferentially with the melon slice bracket in conjunction with the workpiece 15.

[0089] In this embodiment, the telescopic push rod can be an electric push rod and can be equipped with pressure sensing to change the support height of the bearing wheel by measuring the pressure borne by the telescopic push rod.

[0090] As Figure 12 shown, according to an embodiment of the present invention, in addition to at least one set of petal clamping devices and petal brackets, the butt welding tooling further includes a robot cutting and welding system. The robot cutting and welding system includes a robot system 4, a laser cutting head 3, and a laser welding head 26.

[0091] Compared with methods such as laser lap welding and resistance welding, laser butt welding can obtain a storage tank with higher strength. Using the butt welding tooling provided in this embodiment, a petal ring can be welded from petal workpieces (such as 16 petal workpieces) by using laser cutting and welding equipment. The assembly accuracy of this butt welding tooling is relatively high, which can meet the requirements of laser welding, and can achieve sufficient welding strength to realize laser butt welding between stainless steel thin plate petal workpieces.

[0092] According to an embodiment of the present invention, the robot cutting and welding system can use an industrial robot system or a combination of 3-axis or 5-axis linear modules as the execution mechanism for cutting and welding.

[0093] The robot system carries the laser cutting head to complete the cutting of the edges of the petal workpieces. Different from the way in conventional machining where the workpiece is fixed and the machining equipment adjusts the starting position of the machining trajectory according to the position of the workpiece, the butt welding tooling provided in this embodiment can adopt the method of fixing the cutting trajectory and moving the workpiece to the machining area. Since the cutting trajectory is the same trajectory, after the adjacent edges of two petal workpieces are cut, they are driven by their respective base linear slides to move towards each other until they are together, so that the gap and misalignment of the butt weld can reach the assembly state required for laser welding. Then, the robot system carries the laser welding head to perform welding to connect the two petal workpieces into one body. From cutting to welding, the key pressing device can always press the petal workpiece to make the petal workpiece fit with the inner tire profile, and the pressing state is not released until the longitudinal seam welding of the petal at this position is completed. This method can effectively avoid the situation where the joining does not meet the requirements of laser welding due to the error of the two cutting trajectories of adjacent two petal workpieces. The robot system executes the cutting trajectory at a fixed position, and the cutting trajectory is a longitudinal space curve, which can be set according to the theoretical curve shape of the edge of the petal workpiece. This butt welding tooling can improve the assembly accuracy of the longitudinal seam of the petal workpiece, and at the same time, using robot laser welding can improve the welding strength.

[0094] Due to the material characteristics of the stainless steel sheet, the springback of the sheet metal parts is large. In the traditional method, after batch finishing of the segmented workpiece, it needs to be changed to another station for assembly welding. However, in this method, re-clamping after finishing cannot meet the requirements of laser welding. The welding fixture of this embodiment performs welding immediately after the finishing process of cutting is completed after clamping the segmented workpiece to be welded on the same set of fixtures, and then performs cutting and welding on another pair of segmented workpieces. Repeat this process until a complete segmented ring is formed. This process does not require secondary clamping, improving the welding accuracy.

[0095] In this embodiment, the laser cutting head and the laser welding head can share a set of robot systems as the actuating mechanism. If the welding fixture is provided with multiple groups (such as two groups) of segmented clamping devices, multiple sets (such as two sets) of robot systems can be configured to cooperate with a group of segmented clamping devices respectively to perform cutting and welding independently.

[0096] The above embodiments of the present utility model can be combined with each other and have corresponding technical effects.

[0097] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A stainless steel storage tank segment welding tooling, characterized in that, Comprising: At least one set of petal clamping devices and petal supports; Each set of the petal clamping devices includes two corresponding inner and outer tire devices; The inner and outer tire devices include an inner tire profile and an outer tire frame. The inner tire profile is used to support the inner side surface of the petal workpiece, and the outer tire frame is used to press the petal workpiece against the inner tire profile from the outer side surface of the petal workpiece. The petal support is a circular ring support, which includes an upper support and a lower support. The upper support is used to support the upper end of the petal workpiece, and the lower support is used to support the lower end of the petal workpiece; The two inner and outer tire devices are used to clamp the first petal workpiece and the second petal workpiece respectively for welding the first petal workpiece and the second petal workpiece.

2. The tailor-welded tooling according to claim 1, characterized in that, The inner and outer tire devices further include a base linear slide; the inner tire profile and the outer tire frame are arranged on the base linear slide, and the outer tire frame is rotatably connected to the base linear slide to rotate towards or away from the inner tire profile.

3. The tailor-welding tooling according to claim 2, characterized in that, The inner and outer tire devices further include an outer tire driving cylinder; one end of the outer tire driving cylinder is connected to the base linear slide, and the other end is connected to the outer side surface of the outer tire frame to push or pull the outer tire frame to rotate towards or away from the inner tire profile.

4. The tailored blank tooling according to claim 1, characterized in that, At least one set of piano key pressing devices are respectively arranged on the parts of the two outer tire frames close to each other. The piano key pressing devices are used to press the petal workpiece against the inner tire profile corresponding to the outer tire frame.

5. The tailor-welded tooling according to claim 1, characterized in that, Retractable positioning pins are correspondingly arranged at the upper and lower ends of the outer side surface of the inner tire profile. The retractable positioning pins are used to cooperate with the petal workpiece to position the petal workpiece.

6. The tailor-welding tooling according to claim 1, characterized in that The upper support includes an upper support base and rubber wheels. The rubber wheels are rotatably arranged at the top of the upper support base. The lower support includes a lower support base and roller wheels. The roller wheels are rotatably arranged at the top of the lower support base; The rubber wheels and the roller wheels are respectively used to support the upper end surface and the lower end surface of the petal workpiece, and cooperate with the petal workpiece to rotate circumferentially along the petal support through rotation.

7. The tailored blank tooling according to claim 1, wherein A circumferential tire is arranged at the top of the lower support, and the inner side surface of the petal workpiece is placed in contact with the circumferential tire.

8. The tailor-welded tooling according to claim 7, wherein An arc section pressing device is further arranged at the top of the lower support. The arc section pressing device includes an arc section driving cylinder and a pressing arc section block. One end of the arc section driving cylinder is connected to the lower support, and the other end is connected to the pressing arc section block to push the pressing arc section block towards the petal workpiece to press the petal workpiece against the circumferential tire, or pull the pressing arc section block away from the petal workpiece.

9. The tailor-welded tooling according to claim 2, wherein, The base linear slide includes a slide base and a slide. The slide is arranged on the upper end surface of the slide base, and the inner and outer tire devices are arranged on the slide. The slide can slide relative to the slide base to drive the inner and outer tires and the petal workpiece to perform circumferential fine adjustment around the petal support.

10. The tailor-welded tooling according to claim 9, characterized in that A radial linear slide is arranged on the slide. The radial linear slide includes a circumferential tire short arc plate that can slide relative to the slide along the radial direction of the petal support. The circumferential tire short arc plate abuts against the inner side surface of the petal workpiece by moving towards the petal workpiece.

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