Welding device and welding method for auxiliary fuel tank

Abstract

The invention discloses a welding device and a welding method for an auxiliary fuel tank, and relates to the field of welding of aircraft auxiliary fuel tanks, comprising: a robot moving track and a robot welding system; a plurality of circumferential seam welding machine tools, the circumferential seam welding machine tools comprising a head seat and a tail seat arranged on a rigid base; a circumferential seam welding internal support external pressure positioning clamping system, which is arranged on the circumferential seam welding machine tools, and comprises an internal support tool and an external pressure positioning tool, the internal support tool comprises an internal support tool support and a plurality of expansion blocks, an internal support cylinder is arranged in the internal support tool support, the internal support cylinder is connected with the expansion blocks, the external pressure positioning tool comprises a tool frame and an annular piano key mechanism, the annular piano key mechanism is connected with the head seat or the tail seat through the tool frame, and the annular piano key mechanism comprises a plurality of key components and a driving unit; the welding device can ensure that the roundness, circumference, weld assembly gap and misalignment consistency of the circumferential seam welding port of the tapered cylinder section of the aircraft auxiliary fuel tank meet the requirements.

Description

Technical Field

[0001] The invention belongs to the field of welding of aircraft auxiliary fuel tanks, and more specifically, relates to a welding device and a welding method for auxiliary fuel tanks. Background Art

[0002] An aircraft auxiliary fuel tank is an aluminum alloy spindle body that is butt-welded in sequence with a nose cone, several conical barrel sections, several support frames and a tail section, with a total of several annular welds. At present, the roundness, circumference, weld gap and misalignment consistency of the butt ports of the nose cone, conical barrel section and tail section are not ideal, and the internal support strength is low during stirring welding. Under this circumstance, it is very difficult to automatically and continuously weld the weld, and the welding qualification rate is low and the rework rate is high. Ensuring the consistency of the port roundness, circumference, weld gap and misalignment, improving the strength of the internal support frame during stirring welding, and thus improving the welding qualification rate are the difficulties and key points in production.

[0003] Aircraft auxiliary fuel tanks are large thin-walled parts, which require that the annular butt welds must be reliably fixed and accurately aligned without misalignment. This requires that the clamping be firm and reliable, and that there be no instability or deformation during the welding operation.

[0004] At present, the welding process of aircraft auxiliary fuel tank is as follows: first, the nose cone, conical barrel section, support frame, and tail section docking ports are cleaned separately, and then simple tooling is used to adjust the position manually to assemble the aircraft auxiliary fuel tank. In order to ensure the consistency of the port roundness, circumference, weld assembly gap and misalignment, the labor intensity is high, the assembly is difficult and the efficiency is low, which is time-consuming and labor-intensive. Manual welding has high work intensity, uneven welding heat input, and uneven weld size, so the welding quality and geometric tolerance and dimensional tolerance are difficult to control. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide a welding device and a welding method for an auxiliary fuel tank. The welding device can ensure that the roundness, circumference, weld group gap and misalignment consistency of the annular weld port of the tapered cylinder section of the aircraft auxiliary fuel tank meet the requirements, provide sufficient internal support strength during stirring welding, ensure the overall shape requirements of the auxiliary fuel tank, and through the control of the robot welding process, realize the automation of the annular weld of each tapered cylinder section of the auxiliary fuel tank, thereby improving the welding quality of the weld.

[0006] In order to achieve the above object, the present invention provides a welding device for an auxiliary fuel tank, comprising:

[0007] The robot moves the track and slides to set up multiple robot welding systems;

[0008] A plurality of circumferential seam welding machines are respectively arranged on both sides of the robot moving track, the circumferential seam welding machine comprises a headstock and a tailstock, the headstock is fixedly arranged on a rigid base, and the tailstock is slidably arranged on the rigid base;

[0009] The internal support and external pressure positioning and clamping system for annular seam welding is arranged on the annular seam welding machine tool, and the internal support and external pressure positioning and clamping system for annular seam welding includes an internal support tooling and an external pressure positioning tooling, the internal support tooling includes an internal support tooling support connected to the head seat and a plurality of expansion blocks arranged circumferentially along the internal support tooling support, the internal support tooling support is tubular, an internal support cylinder is arranged in the internal support tooling support, the output end of the internal support cylinder is connected to the expansion block, driving the expansion block to move along the radial direction of the internal support tooling support, the external pressure positioning tooling includes a tooling frame and an annular key mechanism, the annular key mechanism is arranged at one end of the tooling frame, and the other end of the tooling frame is connected to the head seat or the tail seat, the annular key mechanism includes a plurality of key assemblies and a driving unit distributed circumferentially, and the driving unit can drive the key assembly to move along the radial direction of the annular key mechanism.

[0010] Optionally, a support plate is provided at one end of the internal support tooling support, and the support plate is a circular flat plate structure. The output end of the internal support cylinder is telescopically arranged at the center of the support plate. The output end of the internal support cylinder is connected to one end of a connecting rod, and the other end of the connecting rod is hingedly connected to the active expansion block.

[0011] Optionally, the expansion block is connected to the support plate through a guiding linear guide rail, the expansion block includes an active expansion block and a passive expansion block arranged at intervals, the active expansion block is connected to the connecting rod, and the passive expansion block is connected to the support plate through a return spring, the width of the active expansion block decreases from the center of the support plate to the periphery, and the width of the passive expansion block increases from the center of the support plate to the periphery, and the end of the active expansion block is slidably matched with the end of the passive expansion block.

[0012] Optionally, the external pressure positioning tooling includes an external pressure positioning tooling on the headstock side and an external pressure positioning tooling on the tailstock side, and the external pressure positioning tooling on each side also includes an auxiliary positioning ring arranged in the tooling frame and an axial adjustment mechanism arranged at the end of the tooling frame.

[0013] Optionally, the key assembly includes:

[0014] A piano key support, connected to one end of the tooling frame via an annular piano key mounting seat;

[0015] The key fingertip is connected to one end of the key body, the other end of the key body is connected to the key support, the middle part of the key body is connected to the key support through a return spring, and an annular airbag is arranged between the key body and the inner side of the annular key mounting seat, and the annular airbag serves as the driving unit.

[0016] Optionally, it also includes a robot trolley system, which includes a servo drive mechanism and a robot mounting base arranged on the robot mobile trolley, and the robot welding system is arranged on the robot mounting base, and the robot welding system includes a stirring welding robot and a TIG welding robot.

[0017] Optionally, the robot moving track includes a guide rail and a rack, the robot moving trolley is slidably arranged on the guide rail, and the rack is connected to the servo drive mechanism.

[0018] Optionally, the rigid base includes an axial track and a lateral track, the lateral track is connected to one end of the axial track, the other end of the axial track is provided with the head seat, a plurality of trolley-type brackets are slidably arranged on the axial track, and a liftable tug wheel is arranged on the trolley-type bracket.

[0019] Optionally, the headstock and the tailstock are both connected to the annular seam welding internal support external pressure positioning clamping system via a faceplate, and the headstock is connected to the faceplate via a rotation drive unit.

[0020] The present invention also provides a welding method for an auxiliary fuel tank, using the above-mentioned welding device for the auxiliary fuel tank, the welding method comprises:

[0021] Connecting the inner support tooling with the head seat, and the inner support cylinder drives the expansion block to be recovered;

[0022] Put a section of the cone to be welded into the external pressure positioning tooling on the head seat side, and adjust the relative position of the cone to be welded and the annular key mechanism;

[0023] Connecting the external pressure positioning tooling on the head seat side where the cone to be welded is installed to the head seat;

[0024] Put another section of the cone to be welded into the external pressure positioning tooling on the tailstock side, and adjust the relative position of the cone to be welded and the annular key mechanism;

[0025] Connecting the external pressure positioning tooling on the tailstock side where the cone to be welded is mounted to the tailstock;

[0026] The tailstock is moved on the rigid base to bring the ends of the two sections of cones to be welded closer;

[0027] Tighten the tailstock axial clamping mechanism to eliminate the gap between the ports of the two sections of cones to be welded;

[0028] When TIG welding is performed, the expansion block is driven to extend by the inner support cylinder, and the expansion block tightly supports the inner wall of the port of the cone to be welded;

[0029] When stirring welding is performed, the expansion block is driven to extend by the inner support cylinder, and the expansion block tightly supports the inner surface of the support frame wing plate under the port of the cone to be welded;

[0030] The key assembly is driven to move by the annular airbag, and the key assembly tightly holds the port of the cone cylinder to be welded;

[0031] The robot welding system is used to weld the port of the cone cylinder to be welded, and at the same time, the circumferential seam welding machine tool drives the cone cylinder to be welded to rotate.

[0032] The present invention provides a welding device and a welding method for an auxiliary fuel tank, which have the following beneficial effects:

[0033] 1. The welding device and the welding method are used in the butt welding process of the tapered barrel section of the auxiliary oil tank, which solves the roundness and circumference consistency of the butt ports of the head cone, tapered barrel section and tail section, and solves the gap between the ring seams to be welded, the amount of misalignment and the internal support strength during stirring welding, thereby reducing the work intensity;

[0034] 2. The welding robot in the welding device cooperates with the girth welding machine tool and the girth welding internal support and external pressure positioning clamping system to realize the automatic welding of the girth of the tapered cylinder section of the auxiliary fuel tank, realize the flexible control of the welding robot, and intervene in the trajectory of the welding robot in real time during the welding process, realizing arc length tracking, welding swing, centering adjustment, welding speed and other fine-tuning intervention during TIG welding, top forging force tracking, centering adjustment, welding speed and other fine-tuning intervention during stirring welding;

[0035] 3. The welding device can ensure the good consistency of weld roundness, circumference, weld gap and misalignment. The internal support strength is high during stirring welding. Automated welding and TIG welding are used to achieve consistent heat input during the welding process, reduce welding deformation and greatly reduce the labor intensity of workers. The high internal support strength during stirring welding ensures welding stability, improves production efficiency and ensures welding quality.

[0036] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0038] Figure 1 A schematic structural diagram of a welding device for an auxiliary fuel tank according to an embodiment of the present invention is shown.

[0039] Figure 2 A schematic structural diagram of a robot moving track according to an embodiment of the present invention is shown.

[0040] Figure 3 A schematic structural diagram of a stirring welding robot trolley system according to an embodiment of the present invention is shown.

[0041] Figure 4 A structural schematic diagram of a TIG welding robot trolley system according to an embodiment of the present invention is shown.

[0042] Figure 5 A schematic structural diagram of a girth welding machine tool according to an embodiment of the present invention is shown.

[0043] Figure 6 A schematic structural diagram of an annular seam welding internal support and external pressure positioning and clamping system according to an embodiment of the present invention is shown.

[0044] Figure 7 A schematic structural diagram of an external pressure positioning tool according to an embodiment of the present invention is shown.

[0045] Figure 8 A schematic structural diagram of a ring-shaped piano key mechanism according to an embodiment of the present invention is shown.

[0046] Fig. 9 A structural schematic diagram of a piano key assembly according to an embodiment of the present invention is shown.

[0047] Fig.10 A schematic structural diagram of an internal support tooling when TIG welding is performed according to an embodiment of the present invention is shown.

[0048] Fig.11 A schematic structural diagram of an auxiliary fuel tank according to an embodiment of the present invention is shown.

[0049] Fig.12 A schematic structural diagram of an internal support fixture support when stirring welding is performed according to an embodiment of the present invention is shown.

[0050] Description of reference numerals:

[0051] 1. Robot moving track; 101. Guide rail; 102. Rack; 103 Base; 2. Stir welding robot welding system; 3. Stir welding robot trolley system; 301. Stir welding robot moving trolley; 302. Stir welding servo drive mechanism; 303. Stir welding spindle control cabinet; 304. Stir welding robot control cabinet; 4. TIG welding robot welding system; 5. TIG welding robot trolley system; 501. TIG welding robot moving trolley; 502. TIG welding servo drive mechanism; 503, TIG welding robot installation base; 504, TIG welding power supply; 505, cooling water tank; 506, TIG welding robot control cabinet; 6, girth welding machine; 601, headstock; 602, tailstock; 603, rigid base; 604, trolley bracket; 7, girth welding internal support external pressure positioning clamping system; 701, internal support tooling; 7011, internal support tooling support; 7012, internal support cylinder; 7013, guide linear guide rail; 7014, active expansion block; 7015, driven expansion block; 7016, return spring; 7017, connecting rod hinge mechanism; 7018, T-slot; 702, external pressure positioning tool; 7021, key assembly; 7022, annular airbag; 7023, key support; 7024, annular key mounting seat; 7025, key fingertip; 7026, key body; 7027, return spring; 703, external pressure positioning tool on the head seat side; 7031, head seat side tool frame; 7032, head seat side auxiliary positioning ring; 7033, head seat side axial adjustment Mechanism; 7034, annular key mechanism on headstock side; 704, external pressure positioning tooling on tailstock side; 7041, tooling frame on tailstock side; 7042, auxiliary positioning ring on tailstock side; 7043, axial adjustment mechanism on tailstock side; 7044, annular key mechanism on tailstock side; 8, head cone; 9, first cone cylinder; 10, second cone cylinder; 11, third cone cylinder; 12, fourth cone cylinder; 13, tail section; 14, first annular gap; 15, second annular gap; 16, third annular gap; 17, fourth annular gap; 18, fifth annular gap. DETAILED DESCRIPTION

[0052] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0053] The present invention provides a welding device for an auxiliary fuel tank, comprising:

[0054] The robot moves the track and slides to set up multiple robot welding systems;

[0055] A plurality of circumferential seam welding machines are respectively arranged on both sides of the robot moving track, and the circumferential seam welding machines include a headstock and a tailstock, wherein the headstock is fixedly arranged on a rigid base, and the tailstock is slidably arranged on the rigid base;

[0056] The circumferential seam welding internal support and external pressure positioning and clamping system is arranged on the circumferential seam welding machine tool. The circumferential seam welding internal support and external pressure positioning and clamping system includes an internal support tooling and an external pressure positioning tooling. The internal support tooling includes an internal support tooling support connected to the head seat and a plurality of expansion blocks arranged circumferentially along the internal support tooling support. The internal support tooling support is tubular, and an internal support cylinder is arranged in the internal support tooling support. The output end of the internal support cylinder is hingedly connected to the expansion block through a connecting rod, driving the expansion block to move along the radial direction of the internal support tooling support. The external pressure positioning tooling includes a tooling frame and an annular key mechanism. The annular key mechanism is arranged at one end of the tooling frame, and the other end of the tooling frame is connected to the head seat or the tail seat. The annular key mechanism includes a plurality of key assemblies and a driving unit distributed circumferentially. The driving unit can drive the key assembly to move along the radial direction of the annular key mechanism to gradually reduce the inner diameter of the annular key mechanism.

[0057] Specifically, a robot moving track and a circumferential seam welding machine are provided in the welding device. The circumferential seam welding machines are respectively arranged on both sides of the robot moving track. According to the steps of circumferential seam welding of the auxiliary fuel tank, a corresponding number of circumferential seam welding machines are arranged. Robot welding systems of different types and numbers are slidingly arranged on the robot moving track. Different robot welding systems are moved to the side of the circumferential seam welding machines through program control. In this way, the number of welding robots can be optimized and the welding work efficiency can be improved. A headstock and a tailstock are set on each circumferential seam welding machine. The tailstock can be moved on a rigid base to place auxiliary oil tank conical cylinder sections of different sizes and lengths. The headstock and the tailstock are connected with an internal support fixture and an external pressure positioning fixture respectively. The internal support fixture is set in the cone to be welded at one end. Through the telescopic control of the internal support cylinder, the expansion block can be opened from the inside of the cone to be welded, so that the end roundness and circumference of the cone can be ensured by the expansion block. The external pressure positioning fixture is set on the headstock and the tailstock respectively. Through the movement of the key assembly, the cone can be clamped circumferentially from the outer periphery to reduce the impact on the cylinder sections on both sides of the weld during welding; in addition, the external pressure positioning fixture and the internal support fixture cooperate to clamp and fix the cone to be welded, and then the tailstock axial clamping mechanism adjusts the relative position of the two sections of the cone to be welded to eliminate the misalignment of the two ports. When the welding device has adjusted the welds of the two sections of the cone to be welded, the robot welding system is used to weld the circumferential seam.

[0058] The tailstock also includes a tailstock axial clamping mechanism and a tailstock slide. The tailstock slide can move on a rigid base, and the bottom surface of the tailstock axial clamping mechanism and the top of the tailstock slide can be relatively slidably adjusted. The tailstock axial clamping mechanism is also connected to the faceplate. When the faceplate is connected to the external pressure positioning tooling connected to the cone to be welded, the external pressure positioning tooling is first driven by the tailstock slide to move toward the head seat, and then the external pressure positioning tooling is driven by the tailstock axial clamping mechanism to move toward the head seat. In this way, the cone to be welded can be fine-tuned in the axial direction, thereby eliminating the gap between the cones to be welded at both ends, avoiding the occurrence of a seam gap at the two ports, and ensuring the welding quality.

[0059] Optionally, a support plate is provided at one end of the inner support tooling support, and the support plate is a circular flat plate structure. The output end of the inner support cylinder is telescopically set at the center of the support plate. The output end of the inner support cylinder is connected to one end of the connecting rod, and the other end of the connecting rod is hingedly connected to the expansion block.

[0060] Specifically, the inner support tooling support is a tubular structure, and the inner support tooling support and the head seat are detachably connected. In addition, an inner support cylinder is fixedly arranged in the inner support tooling support, and the output end of the inner support cylinder can telescope, and the movement trajectory of the output end of the inner support cylinder is perpendicular to the support plate; when the output end of the inner support cylinder is extended, it will drive one end of the connecting rod away from the surface of the support plate, which can drive multiple expansion blocks arranged circumferentially to shrink toward the center of the support plate; when the output end of the inner support cylinder is shortened, it will drive one end of the connecting rod close to the surface of the support plate, which can drive multiple expansion blocks to expand toward the outer periphery of the support plate, so that the expansion block is abutted against the inner surface of the cone to be welded (the inner surface of the wing surface of the support frame during stirring welding), and the outer side of the expansion block is conical (T-slot during stirring welding). When all the expansion blocks are fully expanded, the outer peripheral contour of the expansion block can form a cone, ensuring the roundness and circumference of the end of the cone to be welded (the strength of the support frame during stirring welding).

[0061] Optionally, the expansion block is connected to the support plate through a guiding linear guide rail, the expansion block includes an active expansion block and a passive expansion block arranged at intervals, the active expansion block is connected to the connecting rod, and the passive expansion block is connected to the support plate through a return spring, the width of the active expansion block decreases from the center of the support plate to the periphery, and the width of the passive expansion block increases from the center of the support plate to the periphery, and the end of the active expansion block slides with the end of the passive expansion block.

[0062] Specifically, an active expansion block and a passive expansion block are arranged at intervals in the circumferential direction of the support plate, and the width of the active expansion block on one side close to the center of the support plate is greater than that on the side close to the outer periphery of the support plate, and the width of the passive expansion block on one side close to the outer periphery of the support plate is greater than that on the side close to the center of the support plate, so that the ends of the active expansion block and the passive expansion block form a bite. When the output end of the inner support cylinder is shortened, the connecting rod pushes the active expansion block toward the periphery, and the end of the active expansion block also applies a force to move the passive expansion block outward, so that the passive expansion block also moves outward synchronously. When the output end of the inner support cylinder is extended, the force of the connecting rod pushing the active expansion block toward the periphery disappears, and the return spring on the passive expansion block pulls it back to the center, so that the passive expansion block applies an inward force to the end of the active expansion block through the end, so that the active expansion block also moves toward the center synchronously. Through the telescopic control of the inner support cylinder and the cooperation of the return spring, the radial movement of the active expansion block and the driven expansion block is realized, which facilitates the installation of the cone to be welded and ensures the roundness of the weld port, and effectively controls the distortion amount of the auxiliary oil tank annular seam.

[0063] Optionally, the external pressure positioning tooling includes an external pressure positioning tooling on the headstock side and an external pressure positioning tooling on the tailstock side, and the external pressure positioning tooling on each side also includes an auxiliary positioning ring arranged in the tooling frame and an axial adjustment mechanism arranged at the end of the tooling frame.

[0064] Specifically, the inner support tooling is only connected to the head seat, but when welding the two sections of the cone cylinder with the head cone and the tail section respectively, the inner support tooling does not need to be connected to the head seat to avoid interference between the inner support tooling and the cone cylinder; the external pressure positioning tooling is connected to the head seat and the tail seat respectively, wherein the auxiliary positioning ring in the tooling frame is used to adjust the outer surface of the cone cylinder to ensure that the cone cylinder can be concentric with the tooling frame after entering the external pressure positioning tooling, and when it is necessary to adjust the axial position of the port of the cone cylinder and the annular key mechanism, the axial adjustment mechanism is used to drive the axial adjustment of the cone cylinder to be welded on the tooling frame to ensure that when the key assembly is retracted, it can be accurately pressed on both sides of the weld of the cone cylinder and the weld is located at the axial center of the inner support tooling expansion block.

[0065] Optionally, the key assembly includes:

[0066] The key support is connected to one end of the tooling frame through an annular key mounting seat;

[0067] The key fingertip is connected to one end of the key body, the other end of the key body is connected to the key support, the middle part of the key body is connected to the key support through a return spring, and an annular air bag is arranged between the key body and the inner side of the annular key mounting seat, and the annular air bag serves as a driving unit.

[0068] Specifically, an annular key mounting seat is connected to one end of the tooling frame, and multiple key components are evenly arranged on the inner side of the annular key mounting seat in the circumferential direction, and a key support is correspondingly arranged in each key component, and a key body is movably arranged on each key support, and a key fingertip is arranged at the outer end of the key body, and an annular air bag is arranged between the key body and the inner side of the annular key mounting seat, and all key bodies are arranged corresponding to the annular air bag. When it is necessary to press the outer circumferential surface of the cone cylinder to be welded by the key fingertip, the annular air bag needs to be inflated, and the key fingertips in the circumferential direction move synchronously toward the center of the annular key mounting seat; when it is not necessary to press the outer surface of the cone cylinder to be welded by the key fingertip, the annular air bag is deflated, and the key body moves toward the inner side of the annular key mounting seat under the action of the return spring, so that the key fingertip is separated from the outer surface of the cone cylinder to be welded.

[0069] Optionally, it also includes a robot trolley system, which includes a servo drive mechanism and a robot mounting base arranged on the robot mobile trolley. The robot welding system is arranged on the robot mounting base, and the robot welding system includes a stirring welding robot and a TIG welding robot.

[0070] Optionally, the robot moving track includes a guide rail and a rack, the robot moving trolley is slidably arranged on the guide rail, and the rack is connected to the servo drive mechanism.

[0071] Specifically, a TIG welding robot and a stirring welding robot can be arranged on the robot moving track. The TIG welding robot trolley and the stirring welding robot trolley can respectively ensure the accurate movement of the robot moving trolley on the track through the servo drive mechanism in cooperation with the precision rack on the robot moving track, and ensure the position switching of the TIG welding robot and the stirring welding robot between multiple sets of circumferential seam welding machine tools. The TIG welding robot welding system includes a TIG welding robot and a welding head. The robot welding system is installed on the robot mounting base. Through the cooperation of the robot moving track, the continuous welding of complex welds can be realized. The welding robot can realize flexible control. During the welding process, the welding robot trajectory can be intervened in real time, and the arc length tracking, welding swing, welding centering adjustment, welding speed and other fine-tuning interventions can be realized during the welding process; the stirring welding robot welding system includes a stirring welding robot and a welding head. The robot welding system is also installed on the robot mounting base. Through the cooperation of the robot moving track, the continuous welding of complex welds can be realized. The welding robot can realize flexible control. During the welding process, the welding robot trajectory can be intervened in real time, and the top forging force tracking, welding centering adjustment, welding speed and other fine-tuning interventions can be realized during the welding process.

[0072] Optionally, the rigid base includes an axial track and a lateral track, the lateral track is connected to one end of the axial track, a head seat is provided at the other end of the axial track, a plurality of trolley-type brackets are slidably provided on the axial track, and a liftable tug wheel is provided on the trolley-type bracket.

[0073] Specifically, the rigid base includes a guide rail and a precision rack for the trolley bracket to move. The trolley bracket is installed on the axial track of the rigid base and can move axially along the track. The trolley bracket is equipped with an adjustable support wheel for lifting the internal support and external pressure positioning clamping tooling for the annular seam welding to ensure that the tooling is coaxial with the head and tail seat discs. The lateral track can move the tail seat away from the axial track, which is convenient for loading the cone to be welded.

[0074] Optionally, the headstock and the tailstock are both connected through a faceplate and annular seam welding internal support and external pressure positioning and clamping system, and the headstock is connected to the faceplate through a rotating drive unit.

[0075] Specifically, the circumferential seam welding machine includes a headstock and a movable tailstock. The headstock is fixed on a rigid base to provide rotational power for the workpiece during welding. The headstock is equipped with a faceplate with mounting grooves and positioning stoppers for installing internal support tooling and external pressure positioning tooling on the headstock side to ensure that the tooling is coaxial with the faceplate rotation; the movable tailstock is installed on the lateral track and axial track of the rigid base. Driven by the tailstock moving power mechanism, the tailstock can realize lateral and axial movement on the track. The tailstock is equipped with a faceplate (coaxial with the headstock faceplate when working). The faceplate has mounting grooves and positioning stoppers for installing tooling to ensure that the tooling is coaxial with the faceplate rotation. The tailstock is equipped with an axial clamping device with the function of axially pre-tightening parts to ensure the gap between the two cones to be welded and prevent parts from loosening during welding.

[0076] The present invention also provides a welding method for an auxiliary fuel tank, using the above-mentioned welding device for the auxiliary fuel tank, the welding method comprises:

[0077] Connect the inner support fixture to the headstock, and the inner support cylinder drives the expansion block to be recovered;

[0078] Place a section of cone to be welded into the external pressure positioning tooling on the head seat side, and adjust the relative position of the cone to be welded and the annular key mechanism;

[0079] Connect the external pressure positioning tooling on the head seat side where the cone to be welded is installed to the head seat;

[0080] Place another section of cone to be welded into the external pressure positioning tooling on the tailstock side, and adjust the relative position of the cone to be welded and the annular key mechanism;

[0081] Connect the external pressure positioning tooling on the tailstock side where the cone to be welded is installed to the tailstock;

[0082] Move the tailstock on the rigid base so that the ends of the two sections of cones to be welded are close to each other;

[0083] Tighten the tailstock axial clamping mechanism to eliminate the gap between the ports of the two sections of cones to be welded;

[0084] The expansion block is driven to extend through the inner support cylinder, and the expansion block holds the port of the cone to be welded tightly;

[0085] The key assembly is driven to move by the driving unit, and the key assembly holds the port of the cone to be welded tightly;

[0086] A robot welding system is used to weld the ports of the cone to be welded, and at the same time, a girth welding machine drives the cone to be welded to rotate.

[0087] Specifically, when the welding device is used to weld the auxiliary fuel tank, the internal support and external pressure positioning clamping tooling for the circumferential seam welding fixes the cone to be welded through the internal support tooling and the external pressure positioning tooling, wherein the internal support tooling is connected to the head seat faceplate, and during TIG welding, the inner sides of the two ports of the circumferential seam to be welded are supported by the expansion blocks to ensure the roundness of the two ports and eliminate the misalignment at the same time, and during stir welding, the support frame on the inner sides of the two ports of the circumferential seam to be welded is supported to ensure that the support frame has sufficient rigidity to resist the upsetting force during stir welding; the external pressure positioning tooling is respectively connected to the head seat and the tail seat. The external pressure positioning tooling on the head seat side is installed on the head seat faceplate, and the external pressure positioning tooling on the tail seat side is installed on the tail seat faceplate, which are respectively used for axial positioning and externally embracing the two conical cylinders to be welded. Both external pressure positioning toolings are equipped with axial adjustment mechanisms, which are used to axially fix the two cone cylinders to be welded from both sides of the head and tail during welding, and cooperate with the axial clamping device of the tail seat axial clamping mechanism to ensure the gap between the two cone cylinders to be welded. At the same time, both external pressure positioning toolings are provided with annularly distributed key assemblies, which are used to embrace both sides of the annular weld from the outside during welding to reduce welding deformation of the cylinder section near the weld. Example

[0088] like Figures 1 to 11 As shown, the present invention provides a welding device for an auxiliary fuel tank, the auxiliary fuel tank is composed of a head cone, a first cone cylinder, a second cone cylinder, a third cone cylinder, a fourth cone cylinder and a tail section, the welding device can weld five annular seams of the auxiliary fuel tank, and the welding device includes:

[0089] A robot moving track 1 is slidably provided with a stirring welding robot welding system 2 and a TIG welding robot welding system 4;

[0090] Four girth welding machines 6 are respectively arranged on both sides of the robot moving track 1. The girth welding machines 6 include a headstock 601 and a tailstock 602. The headstock 601 is fixedly arranged on a rigid base 603, and the tailstock 602 is slidably arranged on the rigid base 603.

[0091] The circumferential seam welding internal support external pressure positioning clamping system 7 is arranged on the circumferential seam welding machine 6. The circumferential seam welding internal support external pressure positioning clamping system 7 includes an internal support tool 701 and an external pressure positioning tool 702. The internal support tool 701 includes an internal support tool support 7011 connected to the head seat 601 and a plurality of expansion blocks arranged along the circumference of the internal support tool support 7011. The internal support tool support 7011 is tubular, and an internal support cylinder 7012 is arranged in the internal support tool support 7011. The output end of the internal support cylinder 7012 It is connected to the expansion block, driving the expansion block to move along the radial direction of the cross-section of the inner support tooling support 7011. The external pressure positioning tooling 702 includes a tooling frame and an annular key mechanism. The annular key mechanism is arranged at one end of the tooling frame, and the other end of the tooling frame is connected to the headstock 601 or the tailstock 602. The annular key mechanism includes a plurality of circumferentially distributed key assemblies 7021 and annular airbags 7022. The annular airbags 7022 can drive the key assembly 7021 to move along the radial direction of the annular key mechanism.

[0092] In this embodiment, a support plate is provided at one end of the internal support tooling support 7011, and the support plate is a circular flat plate structure. The output end of the internal support cylinder 7012 is telescopically set at the center of the support plate. The output end of the internal support cylinder 7012 is connected to one end of the connecting rod, and the other end of the connecting rod is hingedly connected to the expansion block.

[0093] In this embodiment, the expansion block is connected to the support plate through a guiding linear guide rail 7013, and the expansion block includes an active expansion block 7014 and a passive expansion block 7015 which are arranged at intervals. The active expansion block 7014 is connected to the connecting rod, and the passive expansion block 7015 is connected to the support plate through a return spring 7016. The width of the active expansion block 7014 decreases from the center of the support plate to the periphery, and the width of the passive expansion block 7015 increases from the center of the support plate to the periphery. The end of the active expansion block 7014 slides with the end of the passive expansion block 7015.

[0094] In this embodiment, the external pressure positioning tool 702 includes an external pressure positioning tool 703 on the headstock side and an external pressure positioning tool 704 on the tailstock side. The external pressure positioning tool 703 on the headstock side includes a headstock side auxiliary positioning ring 7032 arranged in a headstock side tooling frame 7031 and a headstock side axial adjustment mechanism 7033 arranged at the end of the headstock side tooling frame 7031. A headstock side annular key mechanism 7034 is arranged on the other end of the external pressure positioning tool 703 on the headstock side. The external pressure positioning tool 704 on the tailstock side includes a tailstock side auxiliary positioning ring 7042 arranged in a tailstock side tooling frame 7041 and a tailstock side axial adjustment mechanism 7043 arranged at the end of the tailstock side tooling frame 7041. A tailstock side annular key mechanism 7044 is arranged on the other end of the external pressure positioning tool 704 on the tailstock side.

[0095] In this embodiment, the key assembly 7021 includes:

[0096] The key support 7023 is connected to the end of the tooling frame through the annular key mounting seat 7024;

[0097] The key fingertip 7025 is connected to one end of the key body 7026, the other end of the key body 7026 is connected to the key support 7023, the middle part of the key body 7026 is connected to the key support 7023 through a return spring 7027, and the annular airbag 7022 is arranged between the key body 7026 and the annular key mounting seat 7024.

[0098] In this embodiment, a stirring welding robot trolley system 3 and a TIG welding robot trolley system 5 are also included. The stirring welding robot trolley system 3 includes a stirring welding servo drive mechanism 302 and a stirring welding robot mounting base arranged on the stirring welding robot mobile trolley 301. The stirring welding robot welding system 2 is arranged on the stirring welding robot mounting base. The stirring welding robot mobile trolley 301 is also provided with a stirring welding spindle control cabinet 303 and a stirring welding robot control cabinet 304. The TIG welding robot trolley system 5 includes a TIG welding servo drive mechanism 502 and a TIG welding robot mounting base 503 arranged on the TIG welding robot mobile trolley 501. The TIG welding robot welding system 4 is arranged on the TIG welding robot mounting base 503. The TIG welding robot mobile trolley 501 is also provided with a TIG welding power supply 504, a cooling water tank 505 and a TIG welding robot control cabinet 506.

[0099] In this embodiment, the robot moving track 1 includes two guide rails 101 and a rack 102 . The guide rails 101 are arranged on a base 103 . The robot moving trolley is slidably arranged on the guide rails 101 . The rack 102 is connected to a servo drive mechanism.

[0100] In this embodiment, the rigid base 603 includes an axial track and a lateral track. The lateral track is connected to one end of the axial track. A head seat 601 is provided at the other end of the axial track. A plurality of trolley-type brackets 604 are slidably provided on the axial track, and a liftable tug wheel is provided on the trolley-type bracket 604.

[0101] In this embodiment, the headstock 601 and the tailstock 602 are both connected to the faceplate and the annular seam welding internal support external pressure positioning clamping system 7, and the headstock 601 is connected to the faceplate through a rotation driving unit.

[0102] The present invention also provides a welding method for an auxiliary fuel tank, using the above-mentioned welding device for the auxiliary fuel tank, the welding method comprises:

[0103] Connect the inner support fixture 701 to the head seat 601, and the inner support cylinder 7012 drives the expansion block to be recovered;

[0104] Place a section of the cone to be welded into the external pressure positioning tool 703 on the head seat side, and adjust the relative position of the cone to be welded and the annular key mechanism 7034 on the head seat side;

[0105] Connect the external pressure positioning tool 703 on the head seat side where the cone to be welded is installed to the head seat 601;

[0106] Put another section of cone to be welded into the external pressure positioning tool 704 on the tailstock side, and adjust the relative position of the cone to be welded and the annular piano key mechanism 7044 on the tailstock side;

[0107] Connect the external pressure positioning tool 704 on the tailstock side where the cone to be welded is installed to the tailstock 602;

[0108] Move the tailstock 602 on the rigid base 603 so that the ends of the two sections of cones to be welded are close to each other;

[0109] Tighten the tailstock axial clamping mechanism to eliminate the gap between the ports of the two sections of cones to be welded;

[0110] The expansion block is driven to extend through the inner support fixture 701, and the expansion block holds the end of the cone to be welded tightly;

[0111] The key assembly is driven to move by the annular airbag 7022, and the key assembly holds the port of the cone to be welded tightly;

[0112] A robot welding system is used to weld the ports of the cone to be welded, and at the same time, a girth welding machine drives the cone to be welded to rotate.

[0113] In summary, the use process of the welding device is as follows: a. According to the needs of the annular seam of the cone section to be welded, the inner support tooling 701 is installed on the disc of the head seat 601, and the output end of the inner support cylinder 7012 is extended, so that the active expansion block 7014 and the driven expansion block 7015 are switched to the recovery state. When preparing for stirring welding, the active expansion block 7014 and the driven expansion block 7015 are ready to be tightened and fixed with the support frame; b. Place a section of the cone to be welded into the external pressure positioning tooling 703 on the head seat side, adjust the axial adjustment mechanism 7033 on the head seat side so that the port of the cone to be welded extends out of the annular key mechanism 7034 on the head seat side by an appropriate distance, in order to make the matching port of the inner support tooling for annular seam welding be located in the middle position of the expansion block. , then hoist and install the combination of the cone cylinder to be welded and the external pressure positioning tooling 703 on the headstock side onto the faceplate of the headstock 601 as a whole; c. put the other section of the cone cylinder to be welded into the external pressure positioning tooling 704 on the tailstock side, adjust the axial adjustment mechanism 7043 on the tailstock side so that the welding port of the cone cylinder extends out of the annular piano key mechanism 7044 on the tailstock side at an appropriate distance, and then hoist and install the combination of the cone cylinder to be welded and the external pressure positioning tooling 704 on the tailstock side onto the faceplate of the tailstock 602 as a whole; d. move the tailstock 602 laterally or axially, so that the two end surfaces of the cone cylinder to be welded are close to the appropriate position, and then lock the position of the tailstock 602. At this time, it is necessary to ensure that the faceplates of the head and tail seats are coaxial, start the axial clamping mechanism of the tailstock, and push the tailstock faceplate The plate drives the external pressure positioning tool 703 on the tail seat side to move toward the head seat to eliminate the gap between the ports of the two cones to be welded; e. The output end of the internal support cylinder 7012 shrinks, and the active expansion block 7014 and the driven expansion block 7015 tighten the cone to be welded from the inside through the connecting rod hinge mechanism 7017. During TIG welding, the expansion block tightens the inner sides of the two ports of the ring seam to be welded to ensure the roundness of the two ports and eliminate the misalignment at the same time. During stir welding, the expansion block tightens the support frame on the inner sides of the two ports of the ring seam to be welded to ensure that the support frame has sufficient rigidity to resist the upsetting force during stir welding. The two axial adjustment mechanisms on the head and tail seat sides of the external pressure positioning tool 702 and the active and driven expansion blocks in the internal support tool 701 jointly ensure that the two cones to be welded are coaxial; f. Inflate the annular airbag 7022 on the tailstock side respectively. The airbag inflation acts on the annular key mechanisms on both sides to hold the two sides of the weld of the two conical cylinders to be welded from the outside, so as to reduce the welding deformation of the cylinder sections on both sides of the weld during welding; g. Move the TIG welding robot welding system 4 or the stirring welding robot trolley system 3 to the top of the weld according to the welding process required by the drawing, start the preset welding parameters to complete the welding of this section of the annular seam; weld the first annular seam 14, the second annular seam 15, the third annular seam 16, the fifth annular seam 18 and the fourth annular seam 17 in turn, and select a suitable annular seam welding machine tool 6, annular seam welding internal support external pressure positioning clamping system 7, and a robot welding system combination to complete the welding of all the annular seams of the auxiliary fuel tank.

[0114] When stirring welding is used to weld and fix the support frame in the cone to be welded, the following method is used: Fig.12In the expansion block form shown, all expansion blocks need to fit with the inner side of the support frame, and a T-slot 7018 is provided at the outer peripheral fitting end of the expansion block. The support frame and the T-slot 7018 are clamped and fixed to each other, so that the support frame can fit and support the inner side of the cone cylinder to ensure the welding quality between the two.

[0115] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A welding device for an auxiliary fuel tank, characterized in that: include: The robot moves the track and slides to set up multiple robot welding systems; A plurality of circumferential seam welding machines are respectively arranged on both sides of the robot moving track, the circumferential seam welding machine comprises a headstock and a tailstock, the headstock is fixedly arranged on a rigid base, and the tailstock is slidably arranged on the rigid base; An internal support and external pressure positioning and clamping system for annular seam welding is arranged on the annular seam welding machine tool, the internal support and external pressure positioning and clamping system for annular seam welding comprises an internal support tooling and an external pressure positioning tooling, the internal support tooling comprises an internal support tooling support connected to the head seat and a plurality of expansion blocks arranged circumferentially along the internal support tooling support, the internal support tooling support is tubular, an internal support cylinder is arranged in the internal support tooling support, the output end of the internal support cylinder is connected to the expansion block, driving the expansion block to move along the radial direction of the internal support tooling support, the external pressure positioning tooling comprises a tooling frame and an annular key mechanism, the annular key mechanism is arranged at one end of the tooling frame, the other end of the tooling frame is connected to the head seat or the tail seat, the annular key mechanism comprises a plurality of key assemblies and a driving unit distributed circumferentially, the driving unit can drive the key assembly to move along the radial direction of the annular key mechanism; The external pressure positioning tooling includes an external pressure positioning tooling on the headstock side and an external pressure positioning tooling on the tailstock side, and the external pressure positioning tooling on each side also includes an auxiliary positioning ring arranged in the tooling frame and an axial adjustment mechanism arranged at the end of the tooling frame; The inner support fixture is only connected to the head seat, but when welding the two sections of the cone with the head cone and the tail section, the inner support fixture does not need to be connected to the head seat to avoid interference between the inner support fixture and the cone; The external pressure positioning tooling is connected to the headstock and the tailstock respectively. The auxiliary positioning ring is used to adjust the outer surface of the cone cylinder to ensure that the cone cylinder can be concentric with the tooling frame after entering the external pressure positioning tooling. When it is necessary to adjust the axial position of the port of the cone cylinder and the annular key mechanism, the axial adjustment mechanism drives the axial adjustment of the cone cylinder to be welded on the tooling frame to ensure that when the key assembly is retracted, it can be accurately pressed on both sides of the weld of the cone cylinder, and the weld is located at the axial center of the expansion block of the inner support tooling; While the robot welding system is used to weld the port butt weld of the cone cylinder to be welded, the girth welding machine tool drives the cone cylinder to be welded to rotate.

2. The welding device for auxiliary fuel tank according to claim 1, characterized in that: A support plate is provided at one end of the inner support tooling support, and the support plate is a circular flat plate structure. The output end of the inner support cylinder is telescopically arranged on the center of the support plate. The output end of the inner support cylinder is connected to one end of a connecting rod, and the other end of the connecting rod is hingedly connected to the expansion block.

3. The welding device for auxiliary fuel tank according to claim 2, characterized in that: The expansion block is connected to the support plate through a guiding linear guide rail, and the expansion block includes an active expansion block and a passive expansion block that are spaced apart. The active expansion block is connected to the connecting rod, and the passive expansion block is connected to the support plate through a return spring. The width of the active expansion block decreases from the center of the support plate to the periphery, and the width of the passive expansion block increases from the center of the support plate to the periphery. The end of the active expansion block is slidably matched with the end of the passive expansion block.

4. The welding device for auxiliary fuel tank according to claim 1, characterized in that: The keyboard assembly comprises: A piano key support, connected to one end of the tooling frame via an annular piano key mounting seat; The key fingertip is connected to one end of the key body, the other end of the key body is movably connected to the key support, the middle part of the key body is connected to the key support through a return spring, and an annular airbag is arranged between the key body and the inner side of the annular key mounting seat, and the annular airbag serves as the driving unit.

5. The welding device for auxiliary fuel tank according to claim 1, characterized in that: It also includes a robot trolley system, which includes a servo drive mechanism and a robot mounting base arranged on the robot mobile trolley. The robot welding system is arranged on the robot mounting base, and the robot welding system includes a stirring welding robot and a TIG welding robot.

6. The welding device for auxiliary fuel tank according to claim 5, characterized in that: The robot moving track comprises a guide rail and a rack, the robot moving trolley is slidably arranged on the guide rail, and the rack is connected to the servo drive mechanism.

7. The welding device for auxiliary fuel tank according to claim 1, characterized in that: The rigid base comprises an axial track and a lateral track, wherein the lateral track is connected to one end of the axial track, the other end of the axial track is provided with the head seat, a plurality of trolley-type brackets are slidably provided on the axial track, and a liftable tug wheel is provided on the trolley-type bracket.

8. The welding device for auxiliary fuel tank according to claim 1, characterized in that: The headstock and the tailstock are both connected to the annular seam welding inner support and outer pressure positioning and clamping system through a faceplate, and the headstock is connected to the faceplate through a rotation drive unit.

9. A method for welding an auxiliary fuel tank, using the welding device for an auxiliary fuel tank according to any one of claims 1 to 8, characterized in that: The welding method includes: Connecting the inner support tooling with the head seat, and the inner support cylinder drives the expansion block to be recovered; Put a section of the cone to be welded into the external pressure positioning tooling on the head seat side, and adjust the relative position of the cone to be welded and the annular key mechanism; Connecting the external pressure positioning tooling on the head seat side where the cone to be welded is installed to the head seat; Put another section of the cone to be welded into the external pressure positioning tooling on the tailstock side, and adjust the relative position of the cone to be welded and the annular key mechanism; Connecting the external pressure positioning tooling on the tailstock side where the cone to be welded is mounted to the tailstock; The tailstock is moved on the rigid base to bring the ends of the two sections of cones to be welded closer; The expansion block is driven to extend by the inner support cylinder, and the expansion block tightly supports the port of the cone to be welded; The driving unit drives the key assembly to move, and the key assembly holds the port of the cone to be welded; The robot welding system is used to weld the port butt weld of the cone cylinder to be welded, and at the same time, the circumferential seam welding machine tool drives the cone cylinder to be welded to rotate.

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