Elongated hollow thin-walled box body, box body welding tool, and box body welding method

Abstract

Provided are an elongated hollow thin-walled box body, a box body welding tool, and a box body welding method. The present invention uses internal mandrel positioning assemblies (A2) of a welding tool to support and reinforce the interior of a box body, and uses external frame positioning assemblies (A3) to support and reinforce the exterior of the box body, thereby ensuring the dimensional accuracy of an inner cavity and the outer shape of the box body, and the positional accuracy of a first guide rail (100) and a second guide rail (200); and then linear seams between a first L-shaped skin (1) and a second L-shaped skin (2) are synchronously welded from the middle to both sides, and circular seams at the positions of reinforcing frames (3) are then synchronously and alternately welded from the middle to both sides, thereby avoiding the problem of deformation of the elongated hollow thin-walled box body during welding.

Description

An elongated hollow thin-walled box body and a box body welding tool and method TECHNICAL FIELD

[0001] The present application belongs to the technical field of welding of an elongated hollow thin-walled box body and relates to an elongated hollow thin-walled box body and a box body welding tool and method. BACKGROUND

[0002] An unmanned aerial vehicle launching box body is a component for storing unmanned aerial vehicles and assisting the unmanned aerial vehicles in catapult takeoff. In order to reduce the weight of the box body, a thin-walled skin is usually welded to form a hollow box body structure, and in order to ensure the precision of the catapult takeoff of the unmanned aerial vehicles, a guide rail for guiding the unmanned aerial vehicles is arranged inside the box body, and the position precision of the guide rail directly affects the catapult precision of the unmanned aerial vehicles. At the same time, since the box body is an ultralong thin-walled structure, during the welding of the thin-walled skin, due to the long welding time, long welding path, welding heat and other factors, the inner cavity size, the outer shape size and the internal guide rail position size of the ultralong thin-walled box body are prone to deviation, thereby it is difficult to ensure the precision of the subsequent unmanned aerial vehicles catapulting from the box body, and the unmanned aerial vehicles are prone to be stuck or even fail to be catapulted.

[0003] Therefore, there is an urgent need to solve the problem of size precision and position precision of the ultralong thin-walled box body and the internal guide rail thereof deviating due to deformation of the box body and the guide rail during welding. In view of the above technical problems, the present application discloses an elongated hollow thin-walled box body and a box body welding tool and method.

[0004] SUMMARY

[0005] The present application aims to provide an elongated hollow thin-walled box body and a box body welding tool and method, which can effectively perform internal positioning support and external positioning support on the elongated hollow thin-walled box body structure during welding, thereby effectively ensuring the precision of the guide rail, the inner cavity size and the outer shape size inside the elongated hollow thin-walled box body structure, and effectively preventing the elongated hollow thin-walled box body structure from deforming during welding.

[0006] The present application is implemented by the following technical solutions:

[0007] An elongated hollow thin-walled box body, comprising a first L-shaped skin, a second L-shaped skin, a reinforcing frame, a first guide rail and a second guide rail, the first L-shaped skin and the second L-shaped skin are welded by linear welds to form an elongated hollow thin-walled box body structure, the first guide rail and the second guide rail are pre-welded on the opposite two side walls inside the elongated hollow thin-walled box body structure in parallel alignment, a plurality of reinforcing frames are linearly arranged outside the elongated hollow thin-walled box body structure along the length direction of the elongated hollow thin-walled box body structure, and the reinforcing frames are welded outside the elongated hollow thin-walled box body structure by girth welds.

[0008] In order to better realize the present application, further, the first guide rail comprises a guide surface, the bottom of the guide surface is provided with a lower plane parallel to the horizontal plane, the straightness error of the lower plane itself is less than or equal to 2mm, and the second guide rail is the same in structure as the first guide rail.

[0009] In order to better realize the present application, further, the distance error between the lower plane of the first guide rail and the lower plane of the second guide rail in the vertical direction is less than or equal to 1mm; the distance error between the guide surface of the first guide rail and the guide surface of the second guide rail in the horizontal direction is less than or equal to 1mm; and the parallelism error between the first guide rail and the second guide rail is less than or equal to 2mm.

[0010] An elongated hollow thin-walled box welding tool, comprising a platform, an internal mandrel positioning assembly and an external frame positioning assembly, one end of the platform is provided with a stopper for positioning the elongated hollow thin-walled box along the length direction of the elongated hollow thin-walled box, and the support surface of the platform is provided with a frame avoiding area, a frame matching positioning area and a weld avoiding area corresponding to the position of the reinforcing frame; the internal mandrel positioning assembly is arranged in the inside of the elongated hollow thin-walled box structure, and is used for tightly positioning the inside wall of the elongated hollow thin-walled box structure; and the external frame positioning assembly is arranged corresponding to the reinforcing frame, and is used for positioning and fixing the reinforcing frame outside the elongated hollow thin-walled box structure.

[0011] In order to better realize the present application, further, the internal mandrel positioning assembly comprises a support base arranged in the inside of the elongated hollow thin-walled box structure, a plurality of internal positioning units are linearly arranged on the top end surface of the support base along the length direction of the elongated hollow thin-walled box structure, the internal positioning unit comprises a moving extrusion part and a tightly positioning part, the moving extrusion part and the first guide rail, the moving extrusion part and the second guide rail, and the moving extrusion part and the top inside wall of the elongated hollow thin-walled box structure are all provided with the tightly positioning part, and the tightly positioning part is tightly fixed with the first guide rail, the second guide rail and the top inside wall of the elongated hollow thin-walled box structure along with the linear movement of the moving extrusion part.

[0012] For better implementation of the present application, further, the top positioning part comprises a guide rail top part, an upper plane support part and a guide part, the guide rail top part is arranged between the moving extrusion part and the first guide rail and between the moving extrusion part and the second guide rail, the guide rail top part comprises at least one top part that elastically extends towards the first guide rail or the second guide rail along with the linear movement of the moving extrusion part; the upper plane support part is arranged between the moving extrusion part and the top inner wall of the elongated hollow thin-walled box structure, the upper plane support part comprises at least one support part that elastically extends towards the top inner wall of the elongated hollow thin-walled box structure along with the linear movement of the moving extrusion part; one side of the guide rail top part is provided with a guide part matched with the guide surface of the first guide rail or the second guide rail.

[0013] For better implementation of the present application, further, the moving extrusion part comprises a lead screw, an extrusion inclined iron, a transmission rod and a linear guide rail, the linear guide rail is arranged on the center line of the top end surface of the support base along the length direction of the elongated hollow thin-walled box structure, the extrusion inclined iron is slidingly matched with the linear guide rail, one end of the extrusion inclined iron is threadedly connected with the lead screw, and the other end of the extrusion inclined iron is connected with the extrusion inclined iron in the other internal positioning unit through the transmission rod; the top of the extrusion inclined iron, the side surface corresponding to the first guide rail and the side surface corresponding to the second guide rail are all provided with extrusion inclined surfaces, and the extrusion inclined surfaces are abuttingly connected with one end of the top part or one end of the support part.

[0014] For better implementation of the present application, further, the external frame positioning assembly comprises a side pressing plate assembly and a top pressing plate assembly, the top pressing plate assembly is arranged on the top outside of the elongated hollow thin-walled box structure, the top pressing plate assembly comprises at least one top limiting part matched with the top of the reinforcing frame for limiting, and the top pressing plate assembly comprises at least one top pressing part for pressing the top of the reinforcing frame towards the elongated hollow thin-walled box structure; the two ends of the top pressing plate assembly are provided with the side pressing plate assembly along the vertical direction, the side pressing plate assembly comprises at least one side limiting part matched with the side of the reinforcing frame for limiting, and the side pressing plate assembly comprises at least one side pressing part for pressing the side of the reinforcing frame towards the elongated hollow thin-walled box structure.

[0015] An elongated hollow thin-walled box welding method, comprising the following steps:

[0016] Step 1, a first guide rail is pre-welded on the inner side wall of the first L-shaped skin, and a second guide rail is pre-welded on the inner side wall of the second L-shaped skin in a position flush with the first guide rail, so as to ensure that the parallelism error between the first guide rail and the second guide rail is less than or equal to 2 mm;

[0017] Step 2, the first L-shaped skin and the second L-shaped skin are pre-assembled into an elongated hollow thin-walled box structure, and a reinforcing frame is pre-installed outside the pre-assembled elongated hollow thin-walled box structure.

[0018] Step 3, place the preloaded reinforcing frame on the platform so that the bottom end face of the elongated hollow thin-walled box structure is attached to the top end face of the platform, and part of the reinforcing frame is clamped and matched with the frame positioning area on the platform, so that part of the reinforcing frame extends into the frame avoiding area on the platform, and the welding seam position of part of the reinforcing frame is aligned with the welding seam avoiding area on the platform;

[0019] Step 4, position the reinforcing frame outside the elongated hollow thin-walled box structure through the external frame positioning assembly;

[0020] Step 5, hoist the internal mandrel positioning assembly to the inside of the elongated hollow thin-walled box structure, and adjust the placement position of the support base so that the length direction neutral plane of the support base coincides with the length direction neutral plane of the elongated hollow thin-walled box structure; then the first guide rail, the second guide rail, and the top inner wall of the elongated hollow thin-walled box structure are tightly pressed in the direction of the hollow box outside the elongated hollow thin-walled box structure by moving the extrusion part to drive the jacking positioning part; the reinforcing frame is pressed tightly towards the elongated hollow thin-walled box structure by the external frame positioning assembly;

[0021] Step 6, linearly weld the linear weld between the first L-shaped skin and the second L-shaped skin from the midpoint of the length direction of the elongated hollow thin-walled box structure as the starting point to the two endpoints of the length direction of the elongated hollow thin-walled box structure as the termination point in the direction from the starting point to the termination point of the two ends;

[0022] Step 7: after the linear weld is cooled, the girth weld of the reinforcing frame is welded in the direction from the starting point to the termination point of the two ends, and after all the reinforcing frames are welded, cooling is performed, and then the internal mandrel positioning assembly and the external frame positioning assembly are disassembled.

[0023] In order to better realize the present application, further, in step 7, first, the girth weld of the reinforcing frame at the intermediate position outside the elongated hollow thin-walled box structure is welded, and after the reinforcing frame at the intermediate position is cooled, the girth weld of the remaining reinforcing frames on both sides of the reinforcing frame at the intermediate position is synchronously welded in the direction from the starting point to the termination point of the two ends.

[0024] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0025] (1) The first L-shaped skin and the second L-shaped skin are integrally bent and formed, and the first guide rail and the second guide rail are pre-welded on the opposite side walls of the first L-shaped skin and the second L-shaped skin, thereby ensuring the initial positioning accuracy of the first guide rail and the second guide rail; then the first L-shaped skin and the second L-shaped skin are spliced to form an elongated hollow thin-walled box structure, and a reinforcing frame is arranged outside the elongated hollow thin-walled box structure to position and reinforce the outside of the elongated hollow thin-walled box structure, and the elongated hollow thin-walled box structure deforms during welding;

[0026] (2) The inner cavity and the outside of the elongated hollow thin-walled box are positioned by the elongated hollow thin-walled box welding tool, that is, the first guide rail, the second guide rail and the top inner wall inside the elongated hollow thin-walled box are supported and positioned by the internal core shaft positioning assembly, the position accuracy of the first guide rail and the second guide rail is ensured, and the size accuracy of the inner cavity of the elongated hollow thin-walled box is ensured; the reinforcing frame outside the elongated hollow thin-walled box is positioned and pressed by the external frame positioning assembly, thereby ensuring the shape size accuracy of the elongated hollow thin-walled box; at the same time, the inside of the elongated hollow thin-walled box is supported and reinforced by the internal core shaft positioning assembly, and the outside of the elongated hollow thin-walled box is supported and reinforced by the external frame positioning assembly, thereby effectively preventing the elongated hollow thin-walled box from deforming during welding; and the elongated hollow thin-walled box welding tool is convenient and fast to clamp and disassemble;

[0027] (3) Under the premise of supporting and reinforcing the inside of the elongated hollow thin-walled box by the internal core shaft positioning assembly and supporting and reinforcing the outside of the elongated hollow thin-walled box by the external frame positioning assembly, linear welds between the first L-shaped skin and the second L-shaped skin are pre-welded from the middle to both sides synchronously, and then the girth welds at the reinforcing frame are staggered welded from the middle to both sides synchronously, thereby avoiding the problem of deformation of the elongated hollow thin-walled box during welding. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a schematic view of positioning the elongated hollow thin-walled box by the elongated hollow thin-walled box welding tool;

[0029] Fig. 2 is a schematic view of the structure of the elongated hollow thin-walled box;

[0030] Fig. 3 is a left view of the elongated hollow thin-walled box;

[0031] Fig. 4 is a schematic view of the structure of the elongated hollow thin-walled box welding tool;

[0032] Fig. 5 is a top view of the elongated hollow thin-walled box welding tool;

[0033] Fig. 6 is a left view of the elongated hollow thin-walled box welding tool;

[0034] Fig. 7 is a local enlarged view of Fig. 6 at B;

[0035] Fig. 8 is a structural schematic view of the top-tight positioning part;

[0036] Fig. 9 is a structural schematic view of the moving extrusion part;

[0037] Fig. 10 is a structural schematic view of the external frame positioning assembly;

[0038] Fig. 11 is a structural schematic view of the platform.

[0039] Wherein: 1 - first L-shaped skin; 2 - second L-shaped skin; 3 - reinforcing frame; 100 - first guide rail; 200 - second guide rail; A1 - platform; A2 - internal mandrel positioning assembly; A3 - external frame positioning assembly; A21 - moving extrusion part; A22 - top-tight positioning part; A23 - support chassis; A211 - screw rod; A212 - extrusion inclined iron; A213 - transmission rod; A214 - linear guide rail; A221 - guide rail top-tight part; A222 - upper plane support part; A223 - guide part; A31 - side pressing plate assembly; A32 - top pressing plate assembly. DETAILED DESCRIPTION

[0040] The following detailed description is exemplary in nature and is intended to provide further description of the application. All of the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise.

[0041] It is to be noted that the terminology used herein is for purpose of describing the particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0042] For the convenience of description, if "upper", "lower", "left" and "right" are used in the present application, they only mean the same direction as the upper, lower, left and right of the drawing itself, and do not limit the structure, but only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] The terms "mounting", "connecting", "connecting", "fixing" and the like in the present application should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements, or the interaction relationship between two elements, for those skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the present application.

[0044] Embodiment 1:

[0045] An elongated hollow thin-walled box body of the embodiment, as shown in FIG. 2 and FIG. 3, comprises a first L-shaped skin 1, a second L-shaped skin 2, a reinforcing frame 3, a first guide rail 100, and a second guide rail 200. The first L-shaped skin 1 and the second L-shaped skin 2 are welded by linear welds to form an elongated hollow thin-walled box structure. The first guide rail 100 and the second guide rail 200 are pre-welded on the opposite inner side walls of the elongated hollow thin-walled box structure in parallel alignment. A plurality of reinforcing frames 3 are linearly arranged on the outside of the elongated hollow thin-walled box structure along the length direction of the elongated hollow thin-walled box structure. The reinforcing frames 3 are welded on the outside of the elongated hollow thin-walled box structure by girth welds.

[0046] The first L-shaped skin 1 and the second L-shaped skin 2 are both formed by bending an entire plate of steel sheet with a thickness of 1mm-2mm, and the thickness of the steel sheet is preferably 1.5mm. The length of the first L-shaped skin 1 and the second L-shaped skin 2 is greater than or equal to 7m. The first L-shaped skin 1 and the second L-shaped skin 2 are spliced to form an elongated hollow thin-walled box structure, and the length of the elongated hollow thin-walled box structure is greater than or equal to 7m. The width of the elongated hollow thin-walled box structure in the cross section is 300mm-500mm, and the height of the elongated hollow thin-walled box structure in the cross section is 300mm-500mm. The cross-sectional profile of the elongated hollow thin-walled box structure is square or rectangular, thereby ensuring that the spliced elongated hollow thin-walled box structure has sufficient rigidity in the length direction.

[0047] Meanwhile, in order to ensure the installation accuracy of the first guide rail 100 and the second guide rail 200, and at the same time meet the use requirements of the thin-walled box body, the first guide rail 100 and the second guide rail 200 cannot be installed in the way of assembling and debugging at the same time, and need to be pre-welded on the opposite side walls of the first L-shaped skin 1 and the second L-shaped skin 2 respectively before the first L-shaped skin 1 and the second L-shaped skin 2 are welded. Then the first L-shaped skin 1 and the second L-shaped skin 2 are welded to form the thin-walled box body structure, and after the thin-walled box body structure is formed, in order to ensure that the thin-walled box body structure does not deform, a plurality of reinforcing frames 3 are arranged linearly along the length direction outside the thin-walled box body structure in sequence, which are used to reinforce the thin-walled box body structure.

[0048] Further, the first guide rail 100 includes a guide surface, the bottom of the guide surface is provided with a lower plane parallel to the horizontal plane, the straightness error of the lower plane itself is less than or equal to 2mm, and the second guide rail 200 has the same structure as the first guide rail 100. The guide surface extends parallel to the length direction of the first guide rail 100 and perpendicular to the horizontal plane, the bottom of the guide surface is provided with a lower plane, and the top of the guide surface is provided with an upper plane parallel to the lower plane. In order to ensure the position accuracy of the first guide rail 100 and the second guide rail 200, first of all, the straightness error of the lower plane itself in the length direction of the thin-walled box body structure needs to be less than or equal to 2mm.

[0049] Further, the distance error between the lower plane of the first guide rail 100 and the lower plane of the second guide rail 200 in the vertical direction is less than or equal to 1mm; the distance error between the guide surface of the first guide rail 100 and the guide surface of the second guide rail 200 in the horizontal direction is less than or equal to 1mm; and the parallelism error between the first guide rail 100 and the second guide rail 200 is less than or equal to 2mm.

[0050] Embodiment 2:

[0051] A thin-walled box body welding tool is improved on the basis of embodiment 1, as shown in FIG. 1, FIG. 4 and FIG. 5, which includes a platform A1, an internal core shaft positioning assembly A2 and an external frame positioning assembly A3. One end of the platform A1 is provided with a stop piece for positioning the thin-walled box body along the length direction of the thin-walled box body. The support surface of the platform A1 is provided with a frame avoiding area, a frame cooperating positioning area and a welding seam avoiding area corresponding to the position of the reinforcing frame 3. The internal core shaft positioning assembly A2 is arranged inside the thin-walled box body structure, and is used for jacking and positioning the inner side wall of the thin-walled box body structure. The external frame positioning assembly A3 is arranged corresponding to the reinforcing frame 3, and is used for positioning and fixing the reinforcing frame 3 outside the thin-walled box body structure.

[0052] The platform A1 is used to support the elongated hollow thin-walled box structure, and at the same time to ensure that the bottom end surface of the elongated hollow thin-walled box structure is tightly fitted with the top end surface of the platform A1. As shown in FIG. 11, frame avoiding areas and frame cooperating positioning areas are provided on the top end surface of the platform A1 corresponding to the positions of the reinforcing frames 3 outside the elongated hollow thin-walled box structure. The frame avoiding areas are avoiding holes or avoiding grooves provided on the top end surface of the platform A1, so that the reinforcing frames 3 at the bottom of the elongated hollow thin-walled box structure can extend into the frame avoiding areas for avoiding. The frame cooperating positioning areas are used to cooperate with the reinforcing frames 3 at the bottom of the elongated hollow thin-walled box structure. The size and contour of the frame cooperating positioning areas correspond to the size and contour of the reinforcing frames 3 at the bottom of the elongated hollow thin-walled box structure, so that the reinforcing frames 3 can be positioned while avoiding, thereby ensuring the stability of the elongated hollow thin-walled box structure on the platform A1.

[0053] The internal mandrel positioning assembly A2 is used to extend to the inside of the elongated hollow thin-walled box structure, and to tightly press from inside to outside the first guide rail 100, the second guide rail 200 and the top inner wall of the elongated hollow thin-walled box structure, thereby ensuring the positioning accuracy of the first guide rail 100 and the second guide rail 200, and ensuring the dimensional accuracy of the inner cavity of the elongated hollow thin-walled box structure. Meanwhile, external frame positioning assemblies A3 are provided on the outside of the elongated hollow thin-walled box structure corresponding to the positions of each reinforcing frame 3, which press the reinforcing frames 3 towards the direction close to the elongated hollow thin-walled box structure, and at the same time limit the outer dimension of the elongated hollow thin-walled box structure to avoid the outer dimension of the elongated hollow thin-walled box structure out of tolerance. Through the cooperation of the internal mandrel positioning assembly A2 and the external frame positioning assembly A3, the inside and outside of the entire elongated hollow thin-walled box structure are reinforced, supported and positioned, thereby effectively avoiding the deformation of the elongated hollow thin-walled box structure during the subsequent welding process of the elongated hollow thin-walled box structure.

[0054] The other parts of this embodiment are the same as those of embodiment 1, and thus will not be described again.

[0055] Embodiment 3:

[0056] An improved welding tool for an elongated hollow thin-walled box body, as shown in FIGS. 6 and 7, the internal mandrel positioning assembly A2 includes a support chassis A23 arranged inside the elongated hollow thin-walled box body structure, a plurality of internal positioning units are linearly arranged on the top end face of the support chassis A23 along the length direction of the elongated hollow thin-walled box body structure, the internal positioning units include a movable extrusion part A21 and a clamping positioning part A22, the movable extrusion part A21 is provided with the clamping positioning part A22 between the movable extrusion part A21 and the first guide rail 100, between the movable extrusion part A21 and the second guide rail 200, and between the movable extrusion part A21 and the top inner wall of the elongated hollow thin-walled box body structure, the clamping positioning part A22 moves linearly with the movable extrusion part A21 to clamp and fix the first guide rail 100, the second guide rail 200, and the top inner wall of the elongated hollow thin-walled box body structure.

[0057] The support chassis A23 is integrally welded with the steel plate through a square tube, and the flatness and straightness of the steel plate on the top of the support chassis A23 are pre-calibrated. The bottom of the support chassis A23 is provided with a plurality of universal wheels for conveniently moving the support chassis A23 in the narrow inner cavity of the elongated hollow thin-walled box body structure. A plurality of internal positioning units are linearly arranged on the top end face of the support chassis A23 along the length direction of the elongated hollow thin-walled box body structure, and the adjacent internal positioning units are synchronously linked. The internal positioning units include a movable extrusion part A21 and a clamping positioning part A22, the movable extrusion part A21 can accurately linearly move along the length direction of the elongated hollow thin-walled box body structure, and can extrude and clamp the clamping positioning part A22 during the movement of the movable extrusion part A21. Further, the clamping positioning part A22 clamps the first guide rail 100, the second guide rail 200, and the top inner wall of the elongated hollow thin-walled box body structure from the inside to the outside, ensuring the position accuracy of the first guide rail 100 and the second guide rail 200, and ensuring the size accuracy of the inner cavity of the elongated hollow thin-walled box body structure.

[0058] The other parts of the embodiment are the same as those of embodiment 1 or 2, and will not be described again.

[0059] Embodiment 4:

[0060] An improved welding tool for an elongated hollow thin-walled box body based on any one of embodiments 1-3, as shown in FIGS. 7 and 8, the top positioning part A22 includes a guide rail clamping part A221, an upper plane supporting part A222, and a guide part A223. The guide rail clamping part A221 is arranged between the moving extrusion part A21 and the first guide rail 100 or between the moving extrusion part A21 and the second guide rail 200. The guide rail clamping part A221 includes at least one clamping member that elastically extends towards the first guide rail 100 or the second guide rail 200 along with the linear movement of the moving extrusion part A21. The upper plane supporting part A222 is arranged between the moving extrusion part A21 and the top inner wall of the elongated hollow thin-walled box body structure. The upper plane supporting part A222 includes at least one supporting member that elastically extends towards the top inner wall of the elongated hollow thin-walled box body structure along with the linear movement of the moving extrusion part A21. The guide part A223 is arranged on one side of the guide rail clamping part A221 and cooperates with the guide surface of the first guide rail 100 or the second guide rail 200.

[0061] The guide rail clamping part A221 includes a guide rail clamping support, a guide rail clamping support rod, and a spring. The guide rail clamping support is arranged between the moving extrusion part A21 and the first guide rail 100 or between the moving extrusion part A21 and the second guide rail 200. Taking the first guide rail 100 as an example, a clamping hole is arranged on the guide rail clamping support corresponding to the guide surface of the first guide rail 100. The guide rail clamping support rod is slidably inserted into the clamping hole. A spring is arranged between one end of the guide rail clamping support rod and the guide rail clamping support, and the axis of the spring coincides with the axis of the guide rail clamping support rod. The other end of the guide rail clamping support rod, which is away from the inner wall of the elongated hollow thin-walled box body structure, is in contact with the moving extrusion part A21. When the moving extrusion part A21 moves linearly, the guide rail clamping support rod is extruded by the moving extrusion part A21, causing the guide rail clamping support rod to move towards the inner wall of the elongated hollow thin-walled box body structure until the other end of the guide rail clamping support rod clamps the guide surface of the first guide rail 100. The second guide rail 200 is similar, and the details are not repeated here.

[0062] The upper plane support part A222 comprises an upper plane support base, an upper plane support plate, a guide column and a spring. The upper plane support base is arranged between the top of the guide rail top pressing support on both sides. The upper plane support base is provided with a support hole vertically to the top inner wall of the elongated hollow thin-walled box structure. The two sides of the support hole are provided with guide holes. The bottom end of the upper plane support plate is connected with the support hole through the upper plane support rod in a sliding fit. The bottom end of the upper plane support plate is provided with a guide column on both sides of the upper plane support rod. The guide column is connected with the guide hole in a sliding fit. The bottom end of the upper plane support rod is in abutting connection with the top of the moving extrusion part A21.

[0063] Further, the guide part A223 comprises a guide roller rotatably arranged on one side of the guide rail top pressing support. The rim of the guide roller is in contact with the guide surface. The linear movement of the moving extrusion part A21 is guided by the guide roller.

[0064] The other parts of the embodiment are the same as any one of embodiments 1-3, and thus will not be described again.

[0065] Embodiment 5:

[0066] An elongated hollow thin-walled box welding tool is improved on the basis of any one of embodiments 1-4. As shown in FIG. 9, the moving extrusion part A21 comprises a lead screw A211, an extrusion inclined iron A212, a transmission rod A213 and a linear guide rail A214. The linear guide rail A214 is arranged on the center line of the top end surface of the support base A23 along the length direction of the elongated hollow thin-walled box structure. The extrusion inclined iron A212 is arranged on the linear guide rail A214 in a sliding fit. One end of the extrusion inclined iron A212 is threadedly connected with the lead screw A211. The other end of the extrusion inclined iron A212 is connected with the extrusion inclined iron A212 in the other internal positioning unit through the transmission rod A213. The top of the extrusion inclined iron A212, the side corresponding to the first guide rail 100 and the side corresponding to the second guide rail 200 are all provided with extrusion inclined surfaces. The extrusion inclined surfaces are in abutting connection with one end of the pressing part or one end of the supporting part.

[0067] The extrusion inclined iron A212 is provided with an extrusion inclined surface on the side corresponding to the first guide rail 100, on the side corresponding to the second guide rail 200, and on the top surface of the extrusion inclined iron A212. By rotating the screw A211 in the forward direction, the extrusion inclined iron A212 is driven to move linearly in the length direction of the elongated hollow thin-walled box structure, at which time the extrusion inclined surface extrudes the guide rail clamping support rod and the upper plane support rod, so that the guide rail clamping support rod clamps the first guide rail 100 and the second guide rail 200, and the upper plane support plate clamps the top inner wall of the elongated hollow thin-walled box structure. When the screw A211 is rotated in the reverse direction, the extrusion inclined iron A212 is driven to move linearly in the length direction of the elongated hollow thin-walled box structure in the reverse direction, at which time the extrusion inclined surface no longer extrudes the guide rail clamping support rod and the upper plane support rod, so that the guide rail clamping support rod retracts under the action of the spring and is separated from the first guide rail 100 and the second guide rail 200. The upper plane support rod retracts under the action of the spring and drives the upper plane support plate to be separated from the top inner wall of the elongated hollow thin-walled box structure.

[0068] The other parts of this embodiment are the same as any one of embodiments 1-4, and will not be described again.

[0069] Embodiment 6:

[0070] An elongated hollow thin-walled box welding tool is improved on the basis of any one of embodiments 1-5, as shown in FIG. 10, the outer frame positioning assembly A3 includes a side pressing plate assembly A31 and a top pressing plate assembly A32, the top pressing plate assembly A32 is arranged on the outside top of the elongated hollow thin-walled box structure, the top pressing plate assembly A32 includes at least one top limiting portion for limiting the top of the reinforcing frame 3, and the top pressing plate assembly A32 includes at least one top pressing portion for pressing the top of the reinforcing frame 3 towards the elongated hollow thin-walled box structure; the side pressing plate assembly A31 is arranged at both ends of the top pressing plate assembly A32 in the vertical direction, the side pressing plate assembly A31 includes at least one side limiting portion for limiting the side of the reinforcing frame 3, and the side pressing plate assembly A31 includes at least one side pressing portion for pressing the side of the reinforcing frame 3 towards the elongated hollow thin-walled box structure.

[0071] The side pressing plate assembly A31 includes a side pressing plate support, which is provided with a avoiding slot near the position corresponding to the reinforcing frame 3 on one side of the elongated hollow thin-walled box structure, and a side pressing block is installed across the avoiding slot. The side pressing block is provided with a side pressing groove on the side close to the reinforcing frame 3, which is matched with the contour size of the reinforcing frame 3 to realize the positioning of the reinforcing frame 3. Meanwhile, a side pressing threaded hole is arranged on the side of the side pressing block corresponding to the reinforcing frame 3, and a side pressing bolt is screwed in the side pressing threaded hole to press the side of the reinforcing frame 3 towards the elongated hollow thin-walled box structure.

[0072] The top pressing plate assembly A32 includes a top pressing plate support, which is provided with a avoiding slot near the position corresponding to the reinforcing frame 3 on one side of the elongated hollow thin-walled box structure, and a top pressing block is installed across the avoiding slot. The top pressing block is provided with a top pressing groove on the side close to the reinforcing frame 3, which is matched with the contour size of the reinforcing frame 3 to realize the positioning of the reinforcing frame 3. Meanwhile, a top pressing threaded hole is arranged on the top of the top pressing block corresponding to the reinforcing frame 3, and a top pressing bolt is screwed in the top pressing threaded hole to press the top of the reinforcing frame 3 towards the elongated hollow thin-walled box structure.

[0073] Through the positioning and pressing of the reinforcing frame by the side pressing plate assembly A31 and the top pressing plate assembly A32, the outer dimension of the elongated hollow thin-walled box structure is controlled, and the positioning of the elongated hollow thin-walled box structure is realized.

[0074] The other parts of the embodiment are the same as any one of embodiments 1-5, and will not be described again.

[0075] Embodiment 7:

[0076] An elongated hollow thin-walled box welding method, comprising the following steps:

[0077] Step 1, a first guide rail 100 is pre-welded on the inner side wall of the first L-shaped skin 1, and a second guide rail 200 is pre-welded on the inner side wall of the second L-shaped skin 2 flush with the position of the first guide rail 100, so that the parallelism error between the first guide rail 100 and the second guide rail 200 is less than or equal to 2mm;

[0078] Step 2, the first L-shaped skin 1 and the second L-shaped skin 2 are pre-assembled into an elongated hollow thin-walled box structure, and a reinforcing frame 3 is pre-installed outside the pre-assembled elongated hollow thin-walled box structure;

[0079] Step 3, place the pre-assembled elongated hollow thin-walled box structure with reinforcing frames 3 on platform A1, so that the bottom end face of the elongated hollow thin-walled box structure is attached to the top end face of platform A1, and at the same time, part of the reinforcing frames 3 are clamped and matched with the frame matching positioning area on platform A1, so that part of the reinforcing frames 3 extend into the frame avoiding area on platform A1, and the weld position of part of the reinforcing frames 3 is aligned with the weld avoiding area on platform A1;

[0080] Step 4, position the reinforcing frames 3 outside the elongated hollow thin-walled box structure through the external frame positioning assembly A3;

[0081] Step 5, hoist the internal mandrel positioning assembly A2 to the inside of the elongated hollow thin-walled box structure, and adjust the placement position of the support base A23 so that the lengthwise neutral plane of the support base A23 coincides with the lengthwise neutral plane of the elongated hollow thin-walled box structure; then, by moving the extrusion part A21, the first guide rail 100, the second guide rail 200, and the top inner wall of the elongated hollow thin-walled box structure are simultaneously clamped and matched by the top clamping and positioning part A22 in a direction from the inside of the elongated hollow thin-walled box structure to the outside of the hollow box; and the reinforcing frames 3 are pressed towards the elongated hollow thin-walled box structure by the external frame positioning assembly A3;

[0082] Step 6, linearly weld the linear weld between the first L-shaped skin 1 and the second L-shaped skin 2 from the midpoint of the lengthwise direction of the elongated hollow thin-walled box structure as the starting point to the two endpoints of the lengthwise direction of the elongated hollow thin-walled box structure as the termination points in a direction from the starting point to the termination points of the two ends;

[0083] Step 7: after the linear weld cools down, weld the girth weld of the reinforcing frames 3 in a direction from the starting point to the termination points of the two ends, and after all the reinforcing frames 3 are welded, cool them down, and then disassemble the internal mandrel positioning assembly A2 and the external frame positioning assembly A3.

[0084] The cooling time of the above-mentioned welds is greater than or equal to 2 hours, and the above-mentioned welding processes all use laser welding.

[0085] Further, in step 7, first, weld the girth weld of the reinforcing frames 3 at the intermediate position outside the elongated hollow thin-walled box structure, and then, after the reinforcing frames 3 at the intermediate position cool down, simultaneously weld the girth weld of the remaining reinforcing frames 3 on both sides of the reinforcing frames 3 at the intermediate position in a direction from the starting point to the termination points of the two ends.

[0086] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. An elongate hollow thin-walled box, characterised in that, The application relates to a box body structure, which comprises a first L-shaped skin (1), a second L-shaped skin (2), a reinforcing frame (3), a first guide rail (100) and a second guide rail (200), the first L-shaped skin (1) and the second L-shaped skin (2) are welded into an elongated hollow thin-wall box body structure through linear welding, first guide rails (100) and second guide rails (200) are pre-welded on the two opposite inner side walls of the elongated hollow thin-wall box body structure in parallel, a plurality of reinforcing frames (3) are linearly arranged on the outside of the elongated hollow thin-wall box body structure along the length direction of the elongated hollow thin-wall box body structure, and the reinforcing frames (3) are welded on the outside of the elongated hollow thin-wall box body structure through ring welding.

2. An elongate hollow thin-walled box according to claim 1, wherein, The first guide rail (100) comprises a guide surface, the bottom of the guide surface is provided with a lower plane parallel to the horizontal plane, the straightness error of the lower plane is less than or equal to 2 mm, and the second guide rail (200) has the same structure as the first guide rail (100).

3. An elongate hollow thin-walled box according to claim 2, wherein, The distance error between the lower plane of the first guide rail (100) and the lower plane of the second guide rail (200) in the vertical direction is less than or equal to 1 mm; the distance error between the guide surface of the first guide rail (100) and the guide surface of the second guide rail (200) in the horizontal direction is less than or equal to 1 mm; and the parallelism error between the first guide rail (100) and the second guide rail (200) is less than or equal to 2 mm.

4. An elongated hollow thin-walled box welding jig for processing the elongated hollow thin-walled box according to any one of claims 1 to 3, characterized in that, The application further relates to a positioning assembly for the elongated hollow thin-wall box body structure, which comprises a platform (A1), an internal core shaft positioning assembly (A2) and an external frame positioning assembly (A3), one end of the platform (A1) is provided with a stop piece for positioning the elongated hollow thin-wall box body structure along the length direction of the elongated hollow thin-wall box body structure, the support surface of the platform (A1) is provided with a frame avoiding area, a frame matching positioning area and a welding seam avoiding area at positions corresponding to the reinforcing frames (3); the internal core shaft positioning assembly (A2) is arranged in the inside of the elongated hollow thin-wall box body structure and is used for tightly positioning the inner side wall of the elongated hollow thin-wall box body structure; and the external frame positioning assembly (A3) is arranged at the positions corresponding to the reinforcing frames (3) and is used for positioning and fixing the reinforcing frames (3) on the outside of the elongated hollow thin-wall box body structure.

5. An elongated hollow thin-walled box welding fixture according to claim 4, characterized in that The internal core shaft positioning assembly (A2) comprises a support base frame (A23) arranged in the inside of the elongated hollow thin-wall box body structure, a plurality of internal positioning units are linearly arranged on the top end surface of the support base frame (A23) along the length direction of the elongated hollow thin-wall box body structure, the internal positioning units comprise a moving extrusion part (A21) and a tightly positioning part (A22), the moving extrusion part (A21) and the first guide rail (100), the moving extrusion part (A21) and the second guide rail (200) and the moving extrusion part (A21) and the top inner wall of the elongated hollow thin-wall box body structure are all provided with the tightly positioning part (A22), and the tightly positioning part (A22) moves linearly with the moving extrusion part (A21) to tightly fix the first guide rail (100), the second guide rail (200) and the top inner wall of the elongated hollow thin-wall box body structure.

6. An elongated hollow thin-walled box welding fixture according to claim 5, characterized in that The top-tight positioning part (A22) comprises a guide rail top-tight part (A221), an upper plane support part (A222), and a guide part (A223). The guide rail top-tight part (A221) is arranged between the moving extrusion part (A21) and the first guide rail (100) and between the moving extrusion part (A21) and the second guide rail (200). The guide rail top-tight part (A221) comprises at least one top-tight piece that elastically extends towards the first guide rail (100) or the second guide rail (200) along with the linear movement of the moving extrusion part (A21). The upper plane support part (A222) is arranged between the moving extrusion part (A21) and the top inner wall of the elongated hollow thin-walled box structure. The upper plane support part (A222) comprises at least one support piece that elastically extends towards the top inner wall of the elongated hollow thin-walled box structure along with the linear movement of the moving extrusion part (A21). One side of the guide rail top-tight part (A221) is provided with a guide part (A223) that cooperates with the guide surface of the first guide rail (100) or the second guide rail (200).

7. An elongated hollow thin-walled box welding fixture according to claim 6, characterized in that The moving extrusion part (A21) comprises a lead screw (A211), an extrusion inclined iron (A212), a transmission rod (A213), and a linear guide rail (A214). The linear guide rail (A214) is arranged on the centerline of the top end surface of the support base (A23) along the length direction of the elongated hollow thin-walled box structure. The extrusion inclined iron (A212) is slidingly fitted on the linear guide rail (A214). One end of the extrusion inclined iron (A212) is threadedly connected with the lead screw (A211). The other end of the extrusion inclined iron (A212) is connected with the extrusion inclined iron (A212) in the other internal positioning unit through the transmission rod (A213). The top, the side surface corresponding to the first guide rail (100), and the side surface corresponding to the second guide rail (200) of the extrusion inclined iron (A212) are all provided with extrusion inclined surfaces that are in abutting connection with one end of the top-tight piece or one end of the support piece.

8. The elongated hollow thin-walled box body welding tooling apparatus as defined in claim 4, wherein, The external frame positioning assembly (A3) comprises a side pressing plate assembly (A31) and a top pressing plate assembly (A32). The top pressing plate assembly (A32) is arranged on the outside top of the elongated hollow thin-walled box structure. The top pressing plate assembly (A32) comprises at least one top limiting part that cooperates with the top of the reinforcing frame (3) to limit the position. The top pressing plate assembly (A32) comprises at least one top pressing part that presses the top of the reinforcing frame (3) towards the elongated hollow thin-walled box structure. The two ends of the top pressing plate assembly (A32) are provided with side pressing plate assemblies (A31) along the vertical direction. The side pressing plate assembly (A31) comprises at least one side limiting part that cooperates with the side of the reinforcing frame (3) to limit the position. The side pressing plate assembly (A31) comprises at least one side pressing part that presses the side of the reinforcing frame (3) towards the elongated hollow thin-walled box structure.

9. A method of welding an elongated hollow thin-walled box body, implemented on the basis of the tooling for welding an elongated hollow thin-walled box body according to any one of claims 5-8, characterized in that, The method comprises the following steps: Step 1, pre-weld the first guide rail (100) on the inner side wall of the first L-shaped skin (1), and pre-weld the second guide rail (200) on the inner side wall of the second L-shaped skin (2) flush with the position of the first guide rail (100), so that the parallelism error between the first guide rail (100) and the second guide rail (200) is less than or equal to 2mm; Step 2, pre-assemble the first L-shaped skin (1) and the second L-shaped skin (2) into an elongated hollow thin-walled box structure, and pre-install the reinforcing frame (3) outside the pre-assembled elongated hollow thin-walled box structure; Step 3, place the elongated hollow thin-walled box structure with the pre-installed reinforcing frame (3) on the platform (A1), so that the bottom end face of the elongated hollow thin-walled box structure is attached to the top end face of the platform (A1), and at the same time, part of the reinforcing frame (3) is clamped and matched with the frame positioning area on the platform (A1), part of the reinforcing frame (3) extends into the frame avoiding area on the platform (A1), and part of the reinforcing frame (3) is aligned with the weld avoiding area on the platform (A1); Step 4, position the reinforcing frame (3) outside the elongated hollow thin-walled box structure by the external frame positioning assembly (A3); Step 5, hoist the internal mandrel positioning assembly (A2) to the inside of the elongated hollow thin-walled box structure, and adjust the placement position of the supporting base (A23) so that the lengthwise neutral plane of the supporting base (A23) coincides with the lengthwise neutral plane of the elongated hollow thin-walled box structure; then move the extrusion part (A21) to drive the jacking positioning part (A22) to jacking the first guide rail (100), the second guide rail (200), and the top inner wall of the elongated hollow thin-walled box structure in the direction from the inside of the elongated hollow thin-walled box structure to the outside; and the reinforcing frame (3) is pressed towards the elongated hollow thin-walled box structure by the external frame positioning assembly (A3); Step 6, starting from the midpoint of the lengthwise direction of the elongated hollow thin-walled box structure, and ending at the two endpoints of the lengthwise direction of the elongated hollow thin-walled box structure, linearly weld the linear weld between the first L-shaped skin (1) and the second L-shaped skin (2) in the direction from the starting point to the two endpoints; Step 7: after the linear weld cools down, weld the circumferential weld of the reinforcing frame (3) in the direction from the starting point to the two endpoints, and after all the reinforcing frames (3) are welded, cool them down, and then disassemble the internal mandrel positioning assembly (A2) and the external frame positioning assembly (A3). In step 7, first, weld the circumferential weld of the reinforcing frame (3) located at the middle position outside the elongated hollow thin-walled box structure, and then, after the reinforcing frame (3) at the middle position cools down, weld the circumferential weld of the remaining reinforcing frames (3) located on both sides of the reinforcing frame (3) at the middle position in the direction from the starting point to the two endpoints.

10. The method of claim 9, wherein the method further comprises: ​

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