Laser transmission welding clamping device and method for IV type hydrogen storage bottle liner with adjustable aspect ratio

Abstract

The present invention belongs to the technical field of hydrogen storage bottle liner welding, and aims to solve the problems of uneven force during liner welding, which may cause deformation, and the need to position and clamp the liner multiple times, resulting in complicated operation and low welding quality. A laser transmission welding clamping device and method for a type IV hydrogen storage bottle liner with an adjustable aspect ratio are provided, comprising a centering track drive mechanism, a liner annular clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressure mechanism; the centering track drive mechanism is used to adjust the distance between the welding overlap surfaces of the left and right liner to be welded; the liner annular clamping mechanism is used to clamp the liner; the synchronous rotation transmission mechanism is used to drive the left and right liner to rotate synchronously; and the axial pressure mechanism is used to adjust the distance between the left and right liner and the pressure of the welding overlap surfaces. The present invention can achieve efficient and high-quality welding of plastic liners of various specifications.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen storage bottle liner welding, and in particular relates to a laser transmission welding clamping device and method for an IV type hydrogen storage bottle liner with an adjustable aspect ratio. Background Art

[0002] With the transformation of the global energy structure and the rise of environmental awareness, hydrogen fuel cell vehicles, with their zero-emission characteristics, have become a key trend in future automotive development. As a key component of hydrogen fuel cell vehicles, the performance of high-pressure hydrogen storage bottles directly affects their range and safety.

[0003] Type IV high-pressure hydrogen storage cylinders, known for their lightweight, fatigue-resistant, and high hydrogen storage-to-mass ratio, are becoming a global research hotspot. The inner liner of these cylinders is primarily made of polymer materials, with a fiber-wound reinforcement layer to enhance their pressure-bearing capacity. Welding technology is a critical step in the manufacturing process of Type IV hydrogen storage cylinder liners. Because the inner liner is often made of high-barrier composite materials such as high-density polyethylene (HDPE) or nylon (PA), traditional welding methods struggle to ensure weld quality and sealing.

[0004] Laser welding technology is widely used in the welding of Type IV hydrogen storage tank liners due to its advantages such as high efficiency, short cycle times, high welding quality, good sealing, and automated welding. However, for Type IV hydrogen storage tank liners of various sizes, how to ensure welding quality and sealing while achieving precise control and adjustment of the clamping equipment is an urgent problem to be solved.

[0005] Existing laser welding clamping equipment for Type IV hydrogen storage cylinder liners mostly uses a fixed clamping mechanism, which cannot effectively provide clamping force and cannot flexibly adjust the aspect ratio. This results in insufficient centering accuracy of the liner during welding, and deformation due to uneven force, which affects weld quality and sealing. In addition, traditional clamping equipment often requires multiple positioning and clamping of the liner during welding, which increases operational complexity and reduces production efficiency. Summary of the Invention

[0006] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a laser transmission welding clamping device and method for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio.

[0007] The present invention is implemented by the following technical solution: a laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio, comprising a centering track drive mechanism, an inner liner annular clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressurizing mechanism;

[0008] The centering track drive mechanism is used to adjust the distance between the welding overlap surfaces of the left and right inner liner to be welded, and includes a movable frame and a fixed frame; the movable frame can slide relative to the fixed frame and lock after sliding to a set distance;

[0009] The circumferential clamping mechanism of the inner liner includes a left clamping device and a right clamping device, which are used to clamp the left inner liner and the right inner liner respectively, and the left clamping device and the right clamping device are both slidably arranged on the movable frame and can be locked;

[0010] The synchronous rotation transmission mechanism includes a left main shaft, a right main shaft, a left main shaft support seat, a right main shaft support seat, a first servo motor, a synchronous belt transmission mechanism and a gear transmission mechanism. The left main shaft is rotatably connected to the left main shaft support seat, the left main shaft support seat is slidably connected to the movable frame and can be locked, the right main shaft is rotatably connected to the right main shaft support seat, and the right main shaft support seat is fixedly connected to the fixed frame. The left main shaft and the right main shaft are respectively connected to the head end of the left inner liner and the right inner liner. The first servo motor drives the synchronous belt transmission mechanism to drive the gear transmission mechanism to move. The gear transmission mechanism is connected to the left main shaft and the right main shaft. The gear transmission mechanism is used to drive the left main shaft and the right main shaft to rotate synchronously;

[0011] The axial pressure mechanism includes a linear cylinder, a flange, a left bearing seat and a right bearing seat, wherein the cylinder body of the linear cylinder is fixed on the movable frame, the piston rod of the linear cylinder is connected to the left bearing seat via the flange, the left bearing seat is slidably connected to the movable frame and can be locked, the end of the left main shaft away from the left inner liner is rotatably connected to the left bearing seat, the right bearing seat is fixedly arranged on the fixed frame, and the end of the right main shaft away from the right inner liner is rotatably connected to the right bearing seat;

[0012] The left main shaft, the right main shaft, the left main shaft support seat, the right main shaft support seat, the left bearing seat, the right bearing seat, the left clamping device and the right clamping device are coaxially arranged.

[0013] Preferably, the left clamping device and the right clamping device have the same structure, both comprising: a stator, a rotor and a plurality of clamping modules;

[0014] The stator is slidably connected to the movable frame and can be locked, the rotor is rotatably connected to the inside of the stator, and several clamping modules are arranged in annular intervals along the side of the rotor; the clamping module includes a clamping cylinder, a circular chassis, a Y-shaped chassis and a flexible clamping piece, wherein the piston rod of the clamping cylinder located in the middle position of the clamping module has a cylindrical threaded joint, which is threadedly connected to the circular chassis, and the piston rods of the two clamping cylinders located on both sides of the clamping module have I-type joints, which are connected to the Y-shaped chassis by pins; the lower ends of the circular chassis and the Y-shaped chassis are fixedly embedded in the embedding groove on the outer surface of the flexible clamping piece, and the inner surface of the flexible clamping piece is in contact with the outer surface of the corresponding inner tank.

[0015] Preferably, a plurality of air path holes are opened radially on the stator, an annular groove connected to the corresponding air path holes is provided on the rotor, radial holes are opened in the annular groove, and the position and depth of the radial holes match the position of the clamping cylinder, a sealing ring is provided at the boss between adjacent annular grooves, an axial hole is opened on the side of the rotor, and the axial hole is connected to the radial hole in the corresponding annular groove, forming an air path for providing air source to the clamping cylinder.

[0016] Preferably, the synchronous belt transmission mechanism includes a sun gear, a planetary tensioner, a planetary transmission gear, a smooth idler gear and a synchronous belt. The axles of the sun gear, the planetary tensioner and the planetary transmission gear are all rotatably connected to the fixed frame. The planetary tensioner is located directly above the sun gear, the planetary transmission gears are symmetrically arranged on both sides of the sun gear, and the smooth idler gear is symmetrically arranged on the inner side of the planetary transmission gear about the sun gear. One end of the idler gear shaft of the smooth idler gear is provided with a thread, and the idler gear shaft is threadedly connected to an idler gear shaft mounting block. The idler gear shaft mounting block is slidably connected in the guide groove of the fixed frame, and the idler gear shaft mounting block can be locked on the fixed frame by a locking bolt; the sun gear, the planetary tensioner, the planetary transmission gear and the smooth idler gear are connected by a synchronous belt, and the first servo motor is connected to the axle of the sun gear through a first coupling.

[0017] Preferably, the gear transmission mechanism includes a left gear shaft, a right gear shaft and a main shaft transmission gear, the end of the left gear shaft away from the right gear shaft is rotatably connected to the movable frame, the end of the left gear shaft close to the right gear shaft is a hexagonal shaft, and the right gear shaft is a hexagonal hollow shaft, the left gear shaft and the right gear shaft are slidingly connected with clearance fit, the end of the right gear shaft away from the left gear shaft is rotatably connected to the fixed frame, the planetary transmission wheel is installed on the shaft body section of the right gear shaft, and a main shaft transmission gear is respectively connected to the left main shaft and the right main shaft, wherein the main shaft transmission gear on the left main shaft is meshed with the left gear shaft for transmission, and the main shaft transmission gear on the right main shaft is meshed with the right gear shaft for transmission.

[0018] The left and right main shaft supporting seat, the left and right bearing seats and the stator are all slidably connected with the side rails through the slider, and the slider can be locked on the bottom slide rail or the side slide rail through the locking member; the movable frame driving mechanism drives the movable frame to slide along the bottom slide rail through the gear rack transmission; a gear shaft bearing seat is provided on the frame base at a position corresponding to the right gear shaft, and the right gear shaft is installed on the gear shaft bearing seat.

[0019] Preferably, the movable frame driving mechanism includes a second servo motor, a rack, and a driving gear. The second servo motor is arranged on the end face of the movable frame away from the fixed frame. The second servo motor is connected to the driving gear through a second coupling. A groove structure is opened on the frame base along the axial direction of the left main shaft, and racks are installed on the inner walls on both sides of the groove structure. The driving gear and the rack are engaged for transmission.

[0020] Preferably, the synchronous rotation transmission mechanism also includes a valve seat and a valve seat connecting shaft. The end of the left main shaft and the right main shaft close to the welding lap surface is a hollow structure, and the hollow structure is a threaded hole. The left main shaft and the right main shaft are respectively threadedly connected to a valve seat connecting shaft. The left main shaft is connected to the valve seat located on the left inner tank through the valve seat connecting shaft, and the right main shaft is connected to the valve seat located on the right inner tank through the valve seat connecting shaft.

[0021] In a second aspect, the present invention further provides a method for laser transmission welding and clamping the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio, comprising the following steps:

[0022] Place the left inner liner in the left clamping device and connect it to the left spindle, and place the right inner liner in the right clamping device and connect it to the right spindle; put all the sliders in the unlocked state, drive the movable frame to move toward the fixed frame until the distance between the welded lap joints of the left and right inner liner is within the set range; lock all the sliders between the movable frame and the bottom slide rail to keep the position of the movable frame unchanged; open the linear cylinder for pre-pressurization, so that the welded lap joints of the left and right inner liner are completely in contact with each other and have the preset pressure; adjust the position of the inner liner annular clamping mechanism so that The flexible clamping pieces on both sides of the rotor are in contact with the inner liner body after clamping; the sliders at the radial ends of the stator are locked to keep the position of the inner liner annular clamping mechanism unchanged; the air pressure of the linear cylinder is increased to continue to press the welding overlap surfaces of the left inner liner and the right inner liner, and the pressing force of the welding overlap surfaces reaches the pressing force required for welding; the clamping cylinder is opened to clamp the left inner liner and the right inner liner in annular direction; the synchronous rotation transmission mechanism is started to make the left inner liner and the right inner liner rotate synchronously, and at this time, laser transmission welding is performed on the positions to be welded of the left inner liner and the right inner liner.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This device addresses current issues faced during the welding of plastic liners for Type IV high-pressure hydrogen storage bottles, including poor weld quality, unevenness, large misalignment, low yield rate, and inefficient welding. The device integrates four core mechanisms: a centering rail drive mechanism, an annular clamping mechanism for the liners, a synchronous rotation transmission mechanism, and an axial pressure mechanism. These structures work together to significantly improve the overall performance of the welding process.

[0025] Among them, the axial pressure mechanism can not only accurately apply the clamping force required for welding, but also ensure the synchronous rotation of the left and right inner liners, ensuring the stability of welding. The inner liners circumferential clamping mechanism effectively prevents the deformation of the plastic inner liners due to pressure, further improves the centering accuracy of the left and right inner liners, and has the ability to flexibly adapt to inner liners of different diameters. The synchronous rotation transmission mechanism ensures a high degree of consistency in the rotational speed of the left and right inner liners, effectively avoiding uneven welding caused by speed differences, and even potential damage to the weld structure, ensuring the uniformity and integrity of the welding. The centering rail drive mechanism, through a precisely designed linear guide layout, achieves ultra-high precision centering of the left and right inner liners, uniformizes the amount of welding misalignment, and at the same time demonstrates a wide range of adaptability to inner liners of different lengths, further enhancing the flexibility and versatility of the equipment.

[0026] The present invention makes up for the defects of the current laser transmission welding clamping equipment for the injection-molded inner liner of Type IV high-pressure hydrogen storage bottles, and successfully realizes the efficient and high-quality welding of plastic liners of multiple specifications, providing solid technical support for the long-term and safe service of Type IV high-pressure hydrogen storage bottles, and significantly improving the manufacturing level and product reliability of the entire industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the overall assembly structure of the laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the axial pressure mechanism of the present invention;

[0030] Figure 3 yes Figure 2 Schematic diagram of the detailed structure of the connection between the left main shaft and the left bearing seat;

[0031] Figure 4 It is a side view of the circumferential clamping mechanism of the inner liner of the present invention;

[0032] Figure 5 It is a top view of the annular clamping mechanism of the inner liner of the present invention;

[0033] Figure 6 yes Figure 4 Schematic diagram of the structure of the stator;

[0034] Figure 7 yes Figure 4 Schematic diagram of the structure of the middle rotor;

[0035] Figure 8 yes Figure 4 The stator and rotor connection part is Schematic cross-section from the viewing angle;

[0036] Figure 9 yes Figure 4 The stator and rotor connection part is Schematic cross-section from the viewing angle;

[0037] Figure 10 yes Figure 4 Detailed structural diagram of the middle I-type joint and Y-type chassis;

[0038] Figure 11 It is a schematic diagram of the transmission route structure of the synchronous rotation transmission mechanism of the present invention;

[0039] Figure 12 yes Figure 11 Schematic diagram of the structure of the synchronous belt transmission mechanism;

[0040] Figure 13 yes Figure 12 Detailed structural diagram of the smooth idler pulley;

[0041] Figure 14 It is a schematic diagram of the overlap surface of the laser transmission welding of a plastic liner.

[0042] In the figure: 101 - movable frame; 102 - fixed frame; 103 - frame base; 104 - bottom slide rail; 105 - side slide rail; 106 - second servo motor; 107 - rack; 108 - drive gear; 109 - second coupling; 201 - stator; 2011 - air passage hole; 2012 - sealing ring mounting groove; 202 - rotor; 2021 - annular groove; 2022 - radial hole; 2023 - boss; 2024 - axial hole; 203 - clamping cylinder; 204 - circular chassis; 205 - Y-type chassis; 206 - flexible clamping piece; 207 - sealing ring; 301 - left spindle; 302 - right spindle; 3031 -Left spindle support seat; 3032-Right spindle support seat; 304-First servo motor; 305-Sun gear; 306-Planetary tensioner; 307-Planetary transmission wheel; 308-Smooth idler; 309-Timing belt; 310-Idler shaft; 311-Idler shaft mounting block; 312-First coupling; 313-Left gear shaft; 314-Right gear shaft; 315-Spindle transmission gear; 316-Gear shaft bearing seat; 317-Valve seat; 318-Valve seat connecting shaft; 401-Linear cylinder; 402-Flange; 403-Left bearing seat; 404-Right bearing seat; 501-Left liner; 502-Right liner. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other implementations derived by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0044] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0045] The present invention provides an embodiment:

[0046] like Figures 1 to 14 As shown, a laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio comprises a centering track drive mechanism, an inner liner annular clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressurizing mechanism;

[0047] The centering track drive mechanism is used to adjust the distance between the welding overlap surfaces of the left inner liner 501 and the right inner liner 502 to be welded, and includes a movable frame 101 and a fixed frame 102; the movable frame 101 can slide relative to the fixed frame 102 and lock after sliding to a set distance;

[0048] The circumferential clamping mechanism of the inner liner includes a left clamping device and a right clamping device, which are used to clamp the left inner liner 501 and the right inner liner 502 respectively, and the left clamping device and the right clamping device are both slidably arranged on the movable frame 101 and can be locked;

[0049] The synchronous rotation transmission mechanism includes a left main shaft 301, a right main shaft 302, a left main shaft support seat 3031, a right main shaft support seat 3032, a first servo motor 304, a synchronous belt transmission mechanism and a gear transmission mechanism. The left main shaft 301 is rotatably connected to the left main shaft support seat 3031, the left main shaft support seat 3031 is slidably connected to the movable frame 101 and can be locked, the right main shaft 302 is rotatably connected to the right main shaft support seat 3032, and the right main shaft support seat 3032 is fixedly connected to the fixed frame 102. The left main shaft 301 and the right main shaft 302 are respectively connected to the head ends of the left inner liner 501 and the right inner liner 502. The first servo motor 304 drives the synchronous belt transmission mechanism to drive the gear transmission mechanism to move. The gear transmission mechanism is connected to the left main shaft 301 and the right main shaft 302. The gear transmission mechanism is used to drive the left main shaft 301 and the right main shaft 302 to rotate synchronously.

[0050] The axial pressure mechanism includes a linear cylinder 401, a flange 402, a left bearing seat 403 and a right bearing seat 404, wherein the cylinder body of the linear cylinder 401 is fixed on the movable frame 101, the piston rod of the linear cylinder 401 is connected to the left bearing seat 403 via the flange 402, the left bearing seat 403 is slidably connected to the movable frame 101 and can be locked, the end of the left main shaft 301 away from the left inner liner 501 is rotatably connected to the left bearing seat 403, the right bearing seat 404 is fixedly set on the fixed frame 102, and the end of the right main shaft 302 away from the right inner liner 502 is rotatably connected to the right bearing seat 404;

[0051] The left main shaft 301, the right main shaft 302, the left main shaft support seat 3031, the right main shaft support seat 3032, the left bearing seat 403, the right bearing seat 404, the left clamping device and the right clamping device are coaxially arranged.

[0052] In this embodiment, the left clamping device and the right clamping device have the same structure, both including: a stator 201, a rotor 202 and a number of clamping modules; the radial ends of the stator 201 are slidably connected to the movable frame 101 by sliders and can be locked, so that the stator 201 only moves linearly along the side slide rails 105 without rotating; the rotor 202 is rotatably connected to the inside of the stator 201. A number of clamping modules are arranged circumferentially along the two sides of the rotor 202; the clamping module includes a clamping cylinder 203, a circular chassis 204, a Y-type chassis 205 and a flexible clamping sheet 206, wherein the piston rod of the clamping cylinder 203 located in the middle position of the clamping module has a cylindrical threaded joint, which is threadedly connected to the circular chassis 204, and the piston rods of the two clamping cylinders 203 located on both sides of the clamping module have an I-type joint, which is connected to the Y-type chassis 205 by pins, so that the pressure angle can be automatically adjusted during clamping; the lower ends of the circular chassis 204 and the Y-type chassis 205 are designed It is a rectangular parallelepiped with a certain thickness, fixedly embedded in the embedding groove on the outer surface of the flexible clamping piece 206, so as to ensure that the force direction of the inner liner is always along the radial direction when clamping. The inner surface of the flexible clamping piece 206 is in close contact with the corresponding outer surface of the inner liner. The side of the flexible clamping piece 206 in contact with the inner liner has high friction characteristics to ensure that after the inner liner is clamped, the inner liner annular clamping mechanism can rotate synchronously with the inner liner. The flexible clamping piece 206 has a certain degree of flexibility and elasticity. When clamping, it closely fits the inner liner with the movement of the clamping cylinder 203, adapting to the curvature of the inner liner with different radii. The flexible clamping piece 206 always maintains surface contact with the inner liner rather than point contact or line contact, so that the force on the inner liner is uniform and does not deform due to clamping. Four clamping modules are arranged circumferentially on one axial side of the rotor 202 at intervals of 90°, and four clamping modules are also arranged circumferentially on the other side at intervals of 90°; but overall, the clamping modules on both sides are staggered by 45° to achieve uniform clamping of the inner liner, avoid deformation of the plastic inner liner, and also reduce welding residual stress.

[0053] Four air holes 2011 are radially provided on the stator 201. Figure 8In the figure, the four air holes 2011 are respectively the air inlet hole of the clamping cylinder 203 at the middle position, the air outlet hole of the clamping cylinder 203 at the middle position, the air inlet hole of the clamping cylinder 203 at both sides, and the air outlet hole of the clamping cylinder 203 at both sides from right to left. The rotor 202 is provided with an annular groove 2021 which is connected to the corresponding air path hole 2011, and a radial hole 2022 is opened in the annular groove 2021, and the position and depth of the radial hole 2022 match the position of the clamping cylinder 203. A sealing ring 207 is provided at the boss 2023 between adjacent annular grooves 2021 to prevent air leakage. A sealing ring mounting groove 2012 is opened at the position of the sealing ring 207 on the stator 201, and an axial hole 2024 is opened on the side of the rotor 202, and the axial hole 2024 is connected to the radial hole 2022 in the corresponding annular groove 2021, forming an air path for providing air source to the clamping cylinder 203, so that the clamping module can rotate synchronously with the inner tank without affecting the transmission of air pressure.

[0054] The synchronous belt drive mechanism includes a sun gear 305, a planetary tensioner 306, a planetary transmission gear 307, a smooth idler gear 308, and a synchronous belt 309. The axles of the sun gear 305, the planetary tensioner 306, and the planetary transmission gear 307 are all rotatably connected to the fixed frame 102. The axle of the sun gear 305 is rotatably mounted on the fixed frame 102. The sun gear 305 is mounted on its axle near the welded lap joint and is positioned using a key connection. The planetary tensioner 306 is located directly above the sun gear 305 and is mounted on the end of its axle and is positioned using a key connection. The axle of the planetary tensioner 306 is rotatably mounted on the fixed frame 102. The planetary transmission gears 307 are symmetrically arranged on both sides of the sun gear 305, and the smooth idler gear 308 is symmetrically arranged on the inner side of the planetary transmission gear 307 with respect to the sun gear 305. One end of the idler shaft 310 of the smooth idler gear 308 is provided with a thread, and the idler shaft 310 is threadedly connected to the idler shaft mounting block 311, so that the force of the idler shaft 310 is evenly distributed on the idler shaft mounting block 311 to prevent the shaft from failing; the idler shaft mounting block 311 is slidably connected in the guide groove of the fixed frame 102, and the idler shaft mounting block 311 can be locked on the fixed frame 102 by a locking bolt; a tensioning bolt mounting block is provided on the lower side of the idler shaft mounting block 311, and the tensioning bolt mounting block is tightened on the fixed frame 102 with a screw. The position of the smooth idler gear 308 is adjusted by tightening and loosening the tensioning bolt to achieve the purpose of tensioning. The sun gear 305 , the planetary tensioning wheel 306 , the planetary transmission wheel 307 and the smooth idler wheel 308 are connected by a synchronous belt 309 . The first servo motor 304 is connected to the axle of the sun gear 305 via a first coupling 312 . The first servo motor 304 is mounted on the fixed frame 102 .

[0055] The gear transmission mechanism includes a left gear shaft 313, a right gear shaft 314 and a main shaft transmission gear 315. The axial cross-section of the end of the left gear shaft 313 away from the right gear shaft 314 is circular, and the end of the left gear shaft 313 away from the right gear shaft 314 is rotatably connected to the movable frame 101. The end of the left gear shaft 313 close to the right gear shaft 314 is a hexagonal shaft, and the right gear shaft 314 is a hexagonal hollow shaft. The left gear shaft 313 and the right gear shaft 314 are clearance-fitted and slidably connected, so that the left gear shaft 313 can slide in the right gear shaft 314 while transmitting torque, thereby realizing the axial pressure function. The right gear shaft 314 is away from the left One end of the gear shaft 313 is rotatably connected to the fixed frame 102, and the planetary transmission wheel 307 is installed on the shaft section of the right gear shaft 314. The end of the right gear shaft 314 away from the welding lap surface is rotatably connected to the fixed frame 102; a main shaft transmission gear 315 is connected to each of the left main shaft 301 and the right main shaft 302, and the main shaft transmission gear 315 is circumferentially positioned with the corresponding shaft through a key connection, and axially positioned at the same time by a shaft shoulder and a screw locking ring; the main shaft transmission gear 315 on the left main shaft 301 is meshed with the left gear shaft 313 for transmission, and the main shaft transmission gear 315 on the right main shaft 302 is meshed with the right gear shaft 314 for transmission.

[0056] The centering rail driving mechanism also includes a frame base 103, a bottom slide rail 104, a side slide rail 105 and a movable frame driving mechanism. The bottom slide rail 104 is laid on the frame base 103 along the axial direction of the left main shaft 301. The bottom slide rail 104 includes two outer guide rails and two inner guide rails. The outer guide rail is longer and extends to the end of the fixed frame 102. The movable frame 101 is slidably connected to the bottom slide rail 104 through a slider. The fixed frame 102 is fixedly set at one end of the frame base 103. The side slide rail 105 is laid on the movable frame 101 along the axial direction of the left main shaft 301. On the inner wall, the left main shaft support seat 3031, the left bearing seat 403 and the stator 201 are all slidably connected to the side slide rail 105 through a slider, and the slider can be locked on the bottom slide rail 104 or the side slide rail 105 by a locking member; the movable frame drive mechanism drives the movable frame 101 to slide along the bottom slide rail 104 through a gear rack transmission; a gear shaft bearing seat 316 is provided on the frame base 103 at a position corresponding to the right gear shaft 314, and the right gear shaft 314 is mounted on the gear shaft bearing seat 316, and the gear shaft bearing seat 316 bearing seat is a stud vertical bearing seat. The movable frame 101 and the fixed frame 102 are both "half H" shaped, with openings facing each other, and the movable frame 101 is wider than the fixed frame 102, so that the movable frame 101 has a large space to move to the right to weld plastic liners of different lengths.

[0057] The movable frame driving mechanism includes a second servo motor 106, a rack 107, and a driving gear 108. The second servo motor 106 is arranged on the end face of the movable frame 101 away from the fixed frame 102. The second servo motor 106 is connected to the gear shaft of the driving gear 108 through a second coupling 109. The driving gear 108 and the gear shaft of the driving gear 108 are keyed to achieve circumferential positioning, and the axial positioning is simultaneously performed by using a shoulder and a screw locking ring; a groove structure is opened on the frame base 103 along the axial direction of the left main shaft 301, and racks 107 are installed on the inner walls on both sides of the groove structure. The driving gear 108 and the rack 107 are engaged for transmission.

[0058] The synchronous rotation transmission mechanism also includes a valve seat 317 and a valve seat connecting shaft 318. The left main shaft 301 and the right main shaft 302 have a hollow structure at one end close to the welding overlap surface, and the hollow structure is a threaded hole. The left main shaft 301 and the right main shaft 302 are respectively threadedly connected to a valve seat connecting shaft 318. The left main shaft 301 is connected to the valve seat 317 located on the left inner tank 501 through the valve seat connecting shaft 318, and the right main shaft 302 is connected to the valve seat 317 located on the right inner tank 502 through the valve seat connecting shaft 318.

[0059] In the axial pressure mechanism, the radial ends of the left bearing seat 403 are connected to corresponding sliders and are mounted on the side rails 105 of the movable frame 101, so that it can only move linearly along the side rails 105 without rotating. The right bearing seat 404 is directly fastened to the fixed frame 102.

[0060] The present invention also provides a laser transmission welding clamping method for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio, comprising the following steps:

[0061] S101: Place the left inner container 501 in the left clamping device and connect it to the left main shaft 301, and place the right inner container 502 in the right clamping device and connect it to the right main shaft 302;

[0062] S102: All sliders are placed in the unlocked state, and the movable frame 101 is driven to move toward the fixed frame 102 until the distance between the welded joint surfaces of the left inner liner 501 and the right inner liner 502 is within 5 cm;

[0063] S103: Lock all the sliders between the movable frame 101 and the bottom slide rail 104 to keep the position of the movable frame 101 unchanged;

[0064] S104: Turn on the linear cylinder 401 to pre-pressurize, so that the welded joint surfaces of the left inner liner 501 and the right inner liner 502 are completely in contact with each other and have a preset pressure;

[0065] S105: Adjust the position of the inner liner annular clamping mechanism so that the flexible clamping pieces 206 on both sides of the rotor 202 are in contact with the inner liner body after clamping;

[0066] S106: Locking the sliders at both radial ends of the stator 201 to keep the position of the circumferential clamping mechanism of the inner liner unchanged;

[0067] S107: increasing the air pressure of the linear cylinder 401 to continue pressing the welded lap joints of the left inner liner 501 and the right inner liner 502, and ensuring that the pressing force of the welded lap joints reaches the required pressing force for welding;

[0068] S108: Open the clamping cylinder 203 to circumferentially clamp the left inner liner 501 and the right inner liner 502;

[0069] S109: Start the synchronous rotation transmission mechanism to make the left inner liner 501 and the right inner liner 502 rotate synchronously. At this time, laser transmission welding is performed on the positions to be welded of the left inner liner 501 and the right inner liner 502.

[0070] The foregoing description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio, characterized by: It includes a centering track driving mechanism, an inner liner annular clamping mechanism, a synchronous rotation transmission mechanism and an axial pressurizing mechanism; The centering track driving mechanism is used to adjust the distance between the welding overlap surfaces of the left inner liner (501) and the right inner liner (502) to be welded, and includes a movable frame (101) and a fixed frame (102); the movable frame (101) can slide relative to the fixed frame (102) and lock after sliding to a set distance; The circumferential clamping mechanism of the inner liner comprises a left clamping device and a right clamping device, the left clamping device and the right clamping device are respectively used to clamp the left inner liner (501) and the right inner liner (502), and the left clamping device and the right clamping device are both slidably arranged on the movable frame (101) and can be locked; the left clamping device and the right clamping device have the same structure, both comprising: a stator (201), a rotor (202) and a plurality of clamping modules; the stator (201) is slidably connected to the movable frame (101) and can be locked, the rotor (202) is rotatably connected to the inside of the stator (201), and the plurality of clamping modules are circumferentially spaced along the side of the rotor (202); the clamping The module comprises a clamping cylinder (203), a circular chassis (204), a Y-shaped chassis (205) and a flexible clamping piece (206), wherein the piston rod of the clamping cylinder (203) located in the middle position of the clamping module has a cylindrical threaded joint, which is threadedly connected to the circular chassis (204), and the piston rods of the two clamping cylinders (203) located on both sides of the clamping module have I-shaped joints, which are connected to the Y-shaped chassis (205) through pins; the lower ends of the circular chassis (204) and the Y-shaped chassis (205) are fixedly embedded in the embedding groove on the outer surface of the flexible clamping piece (206), and the inner surface of the flexible clamping piece (206) is in contact with the outer surface of the corresponding inner liner; The synchronous rotation transmission mechanism comprises a left main shaft (301), a right main shaft (302), a left main shaft support seat (3031), a right main shaft support seat (3032), a first servo motor (304), a synchronous belt transmission mechanism and a gear transmission mechanism, wherein the left main shaft (301) is rotatably connected to the left main shaft support seat (3031), the left main shaft support seat (3031) is slidably connected to the movable frame (101) and can be locked, and the right main shaft (302) is rotatably connected to the right main shaft support seat (3032). 32), the right spindle support seat (3032) is fixedly connected to the fixed frame (102), the left spindle (301) and the right spindle (302) are respectively connected to the head end of the left inner liner (501) and the right inner liner (502), the first servo motor (304) drives the synchronous belt transmission mechanism to drive the gear transmission mechanism to move, the gear transmission mechanism is connected to the left spindle (301) and the right spindle (302), and the gear transmission mechanism is used to drive the left spindle (301) and the right spindle (302) to rotate synchronously; The axial pressure mechanism comprises a linear cylinder (401), a flange (402), a left bearing seat (403) and a right bearing seat (404), wherein the cylinder body of the linear cylinder (401) is fixed on the movable frame (101), the piston rod of the linear cylinder (401) is connected to the left bearing seat (403) via the flange (402), the left bearing seat (403) is slidably connected to the movable frame (101) and can be locked, the end of the left main shaft (301) away from the left inner liner (501) is rotatably connected to the left bearing seat (403), the right bearing seat (404) is fixedly arranged on the fixed frame (102), and the end of the right main shaft (302) away from the right inner liner (502) is rotatably connected to the right bearing seat (404); The left main shaft (301), the right main shaft (302), the left main shaft support seat (3031), the right main shaft support seat (3032), the left bearing seat (403), the right bearing seat (404), the left clamping device and the right clamping device are coaxially arranged.

2. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 1 is characterized in that: A plurality of air path holes (2011) are radially provided on the stator (201), an annular groove (2021) connected to the corresponding air path holes (2011) is provided on the rotor (202), a radial hole (2022) is provided in the annular groove (2021), and the position and depth of the radial hole (2022) match the position of the clamping cylinder (203), a sealing ring (207) is provided at the boss (2023) between adjacent annular grooves (2021), an axial hole (2024) is provided on the side of the rotor (202), and the axial hole (2024) is connected to the radial hole (2022) in the corresponding annular groove (2021), forming an air path for providing an air source to the clamping cylinder (203).

3. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 1 is characterized in that: The synchronous belt transmission mechanism includes a sun gear (305), a planetary tensioning wheel (306), a planetary transmission wheel (307), a smooth idler wheel (308) and a synchronous belt (309). The axles of the sun gear (305), the planetary tensioning wheel (306) and the planetary transmission wheel (307) are all rotatably connected to the fixed frame (102). The planetary tensioning wheel (306) is located directly above the sun gear (305). The planetary transmission wheels (307) are symmetrically arranged on both sides of the sun gear (305). The smooth idler wheel (308) is symmetrically arranged on the inner side of the planetary transmission wheel (307) with respect to the sun gear (305). The smooth idler wheel ( One end of the idler shaft (310) of the fixed frame (102) is provided with a thread, and the idler shaft (310) is threadedly connected to an idler shaft mounting block (311), and the idler shaft mounting block (311) is slidably connected in a guide groove of the fixed frame (102), and the idler shaft mounting block (311) can be locked on the fixed frame (102) by a locking bolt; the sun gear (305), the planetary tensioning wheel (306), the planetary transmission wheel (307) and the smooth idler wheel (308) are connected by a synchronous belt (309), and the first servo motor (304) is connected to the wheel shaft of the sun gear (305) through a first coupling (312).

4. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 3 is characterized in that: The gear transmission mechanism includes a left gear shaft (313), a right gear shaft (314) and a main shaft transmission gear (315), wherein the end of the left gear shaft (313) away from the right gear shaft (314) is rotatably connected to the movable frame (101), the end of the left gear shaft (313) close to the right gear shaft (314) is a hexagonal shaft, and the right gear shaft (314) is a hexagonal hollow shaft. The left gear shaft (313) and the right gear shaft (314) are in clearance fit and sliding connection, and the right gear shaft (314) away from the left gear shaft (313) is in clearance fit and sliding connection. One end of the left gear shaft (313) is rotatably connected to the fixed frame (102), the planetary transmission wheel (307) is mounted on the shaft section of the right gear shaft (314), and a main shaft transmission gear (315) is connected to each of the left main shaft (301) and the right main shaft (302), wherein the main shaft transmission gear (315) on the left main shaft (301) is meshed with the left gear shaft (313) for transmission, and the main shaft transmission gear (315) on the right main shaft (302) is meshed with the right gear shaft (314) for transmission.

5. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 4 is characterized in that: The centering rail driving mechanism further comprises a frame base (103), a bottom slide rail (104), a side slide rail (105) and a movable frame driving mechanism, wherein the bottom slide rail (104) is laid on the frame base (103) along the axial direction of the left main shaft (301), the movable frame (101) is slidably connected to the bottom slide rail (104) via a slider, the fixed frame (102) is fixedly arranged at one end of the frame base (103), the side slide rail (105) is laid on the inner side wall of the movable frame (101) along the axial direction of the left main shaft (301), and the left main shaft supports the movable frame (101). The support seat (3031), the left bearing seat (403) and the stator (201) are all slidably connected to the side slide rail (105) through a slider, and the slider can be locked on the bottom slide rail (104) or the side slide rail (105) through a locking member; the movable frame driving mechanism drives the movable frame (101) to slide along the bottom slide rail (104) through a gear rack transmission; a gear shaft bearing seat (316) is provided on the frame base (103) at a position corresponding to the right gear shaft (314), and the right gear shaft (314) is installed on the gear shaft bearing seat (316).

6. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 5 is characterized in that: The movable frame driving mechanism includes a second servo motor (106), a rack (107), and a driving gear (108). The second servo motor (106) is arranged on an end face of the movable frame (101) away from the fixed frame (102). The second servo motor (106) is connected to the driving gear (108) through a second coupling (109). A groove structure is provided on the frame base (103) along the axial direction of the left main shaft (301), and racks (107) are installed on the inner walls of both sides of the groove structure. The driving gear (108) and the rack (107) are engaged for transmission.

7. The laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio according to claim 4 is characterized in that: The synchronous rotation transmission mechanism also includes a valve seat (317) and a valve seat connecting shaft (318). One end of the left main shaft (301) and the right main shaft (302) close to the welded overlap surface is a hollow structure, and the hollow structure is a threaded hole. The left main shaft (301) and the right main shaft (302) are respectively threadedly connected to a valve seat connecting shaft (318). The left main shaft (301) is connected to the valve seat (317) located on the left inner shell (501) through the valve seat connecting shaft (318), and the right main shaft (302) is connected to the valve seat (317) located on the right inner shell (502) through the valve seat connecting shaft (318).

8. A laser transmission welding clamping method for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio, based on the laser transmission welding clamping device for the inner liner of a type IV hydrogen storage bottle with an adjustable aspect ratio as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The left inner liner (501) is placed in the left clamping device and connected to the left main shaft (301), and the right inner liner (502) is placed in the right clamping device and connected to the right main shaft (302); All sliders are placed in an unlocked state, and the movable frame (101) is driven to move toward the fixed frame (102) until the distance between the welded lap joints of the left inner liner (501) and the right inner liner (502) is within a set range; Lock all the sliders between the movable frame (101) and the bottom slide rail (104) to keep the position of the movable frame (101) unchanged; Open the linear cylinder (401) to pre-pressurize, so that the welded lap joint surfaces of the left inner liner (501) and the right inner liner (502) are completely in contact with each other and have a preset pressure; Adjusting the position of the inner liner annular clamping mechanism so that the flexible clamping pieces (206) on both sides of the rotor (202) are in contact with the inner liner barrel after clamping; Locking the sliders at both radial ends of the stator (201) to keep the position of the circumferential clamping mechanism of the inner liner unchanged; Increasing the air pressure of the linear cylinder (401) to continue pressing the welding overlap surfaces of the left inner liner (501) and the right inner liner (502), and making the pressing force of the welding overlap surfaces reach the pressing force required for welding; Opening the clamping cylinder (203) to perform circumferential clamping on the left inner liner (501) and the right inner liner (502); The synchronous rotation transmission mechanism is activated to cause the left inner liner (501) and the right inner liner (502) to rotate synchronously, and laser transmission welding is performed on the positions to be welded of the left inner liner (501) and the right inner liner (502).

Images