Laser transmission welding clamping equipment and method for IV type hydrogen storage cylinder inner container with adjustable length-diameter ratio

Abstract

The invention belongs to the technical field of hydrogen storage cylinder inner container welding, and aims to solve the problems that an inner container is prone to deformation due to uneven stress in the welding process, meanwhile, the inner container needs to be positioned and clamped for multiple times, operation is complex, and the welding quality is low. The invention provides a laser transmission welding clamping device and method for an IV type hydrogen storage bottle inner container with an adjustable length-diameter ratio. The laser transmission welding clamping device comprises a centering rail driving mechanism, an inner container annular clamping mechanism, a synchronous rotation transmission mechanism and an axial pressurizing mechanism. The centering rail driving mechanism is used for adjusting the distance between the welding lap joint faces of the left inner container to be welded and the right inner container to be welded. The inner container annular clamping mechanism is used for clamping the inner container; the synchronous rotation transmission mechanism is used for driving the left inner container and the right inner container to rotate synchronously. The axial pressurizing mechanism is used for adjusting the distance between the left inner container and the right inner container and the pressure of a welding lap joint face. According to the welding device, efficient and high-quality welding of the plastic liners of multiple specifications can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of inner liner welding of hydrogen storage cylinders, and particularly relates to a laser transmission welding clamping device and method for the inner liner of a type-IV hydrogen storage cylinder with an adjustable length-diameter ratio. Background Technique

[0002] With the transformation of the global energy structure and the improvement of environmental protection awareness, hydrogen fuel cell vehicles, with their zero-emission characteristics, have become an important trend in the future development of vehicles. And the high-pressure hydrogen storage cylinder, as one of the key components of hydrogen fuel cell vehicles, its performance directly affects the driving range and safety of hydrogen fuel cell vehicles.

[0003] Type-IV high-pressure hydrogen storage cylinders are becoming a research hotspot worldwide due to their light weight, fatigue resistance, high hydrogen storage mass ratio, etc. The inner liner of this type of gas cylinder is mainly made of polymer materials, and the fiber winding reinforcement layer is used to improve its pressure-bearing capacity. In the manufacturing process of the inner liner of a type-IV hydrogen storage cylinder, welding technology is a key link. Since the inner liner material is mostly a high-barrier composite material, such as high-density polyethylene (HDPE) or nylon (PA), traditional welding methods are difficult to ensure welding quality and sealing performance.

[0004] Laser welding technology has been widely used in the welding of the inner liner of type-IV hydrogen storage cylinders due to its advantages of high efficiency, short cycle, high welding quality, good sealing performance, and the ability to achieve automated welding. However, for inner liners of type-IV hydrogen storage cylinders with various size specifications, how to achieve precise control and adjustment of the clamping device while ensuring welding quality and sealing performance is an urgent problem to be solved.

[0005] Most of the existing laser welding clamping devices for the inner liner of type-IV hydrogen storage cylinders adopt fixed clamping mechanisms, which cannot effectively provide clamping force and cannot achieve flexible adjustment of the length-diameter ratio. This results in insufficient centering accuracy of the inner liner during the welding process and deformation due to uneven stress, thus affecting welding quality and sealing performance. In addition, during the welding process, traditional clamping devices often need to position and clamp the inner liner multiple times, resulting in an increase in operation complexity and a decrease in production efficiency. Summary of the Invention

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

[0007] The present invention is realized by adopting the following technical solutions: A laser transmission welding clamping device for the inner liner of a type-IV hydrogen storage cylinder with an adjustable length-diameter ratio includes a centering track driving mechanism, an inner liner circumferential clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressing mechanism; The centering orbit driving mechanism is used to adjust the distance at the welding lap joint of the left inner liner and the 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 be locked after sliding to a set distance; The inner liner circumferential clamping mechanism includes 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 and the right inner liner, and both the left clamping device and the right clamping device are slidably arranged on the movable frame and can be locked; 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, 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 ends 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 act, and the gear transmission mechanism is connected to the left main shaft and the right main shaft, and the gear transmission mechanism is used to drive the left main shaft and the right main shaft to rotate synchronously; The axial pressing mechanism includes a linear cylinder, a flange, a left bearing seat and a right bearing seat. 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 through the flange, the left bearing seat is slidably connected to the movable frame and can be locked, one 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 one end of the right main shaft away from the right inner liner is rotatably connected to the right bearing seat; 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.

[0008] Preferably, the left clamping device and the right clamping device have the same structure, and both include: a stator, a rotor and a plurality of clamping modules; The stator is slidably connected to the movable frame and can be locked, the rotor is rotatably connected inside the stator, and a plurality of clamping modules are circumferentially arranged at 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. The piston rod of the clamping cylinder located in the middle position of the clamping module has a cylindrical threaded joint and is threadedly connected to the circular chassis. The piston rods of the two clamping cylinders located on both sides of the clamping module have I-shaped joints, and the I-shaped joints are connected to the Y-shaped chassis through pins; the lower ends of the circular chassis and the Y-shaped chassis are fixedly embedded in the embedding grooves on the outer surface of the flexible clamping piece, and the inner surface of the flexible clamping piece is in fit contact with the outer surface of the corresponding inner liner.

[0009] Preferably, a plurality of air path holes are radially formed in the stator, a circumferential groove communicating with the corresponding air path holes is arranged on the rotor, a radial hole is formed in the circumferential groove, and the position and depth of the radial hole are matched with the position of the clamping cylinder. A sealing ring is arranged at the boss between adjacent circumferential grooves. An axial hole is formed in the side surface of the rotor, and the axial hole is connected with the radial hole in the corresponding circumferential groove to form an air path for supplying air source to the clamping cylinder.

[0010] Preferably, the synchronous belt transmission mechanism includes a sun gear, a planetary tension pulley, a planetary transmission gear, a smooth idler pulley and a synchronous belt. The axle shafts of the sun gear, the planetary tension pulley and the planetary transmission gear are all rotatably connected to the fixed frame. The planetary tension pulley is located directly above the sun gear. The planetary transmission gears are symmetrically arranged on both sides of the sun gear. The smooth idler pulley is symmetrically arranged inside the planetary transmission gears with respect to the sun gear. One end of the idler pulley shaft of the smooth idler pulley is provided with a thread, and the idler pulley shaft is threadedly connected with an idler pulley shaft mounting block. The idler pulley shaft mounting block is slidably connected in the guide groove of the fixed frame, and the idler pulley shaft mounting block can be locked on the fixed frame through a locking bolt; the sun gear, the planetary tension pulley, the planetary transmission gear and the smooth idler pulley are connected by the synchronous belt, and the first servo motor is connected to the axle shaft of the sun gear through a first coupling.

[0011] Preferably, the gear transmission mechanism includes a left gear shaft, a right gear shaft and a main shaft transmission gear. One end of the left gear shaft far from the right gear shaft is rotatably connected to the movable frame. One end of the left gear shaft close to the right gear shaft is a hexagonal shaft. The right gear shaft is a hexagonal hollow shaft. The left gear shaft and the right gear shaft are slidably connected with clearance fit. One end of the right gear shaft far from the left gear shaft is rotatably connected to the fixed frame. The planetary transmission gear is installed on the shaft section of the right gear shaft. One main shaft transmission gear is connected to each of the left main shaft and the right main shaft. Among them, the main shaft transmission gear on the left main shaft meshes and drives with the left gear shaft, and the main shaft transmission gear on the right main shaft meshes and drives with the right gear shaft.

[0012] Preferably, the centering track driving mechanism further includes a frame base, a bottom slide rail, a side slide rail and a movable frame driving mechanism. The bottom slide rail is laid on the frame base along the axial direction of the left main shaft. The movable frame is slidably connected to the bottom slide rail through a slider. The fixed frame is fixedly arranged at one end of the frame base. The side slide rail is laid on the inner side wall of the movable frame along the axial direction of the left main shaft. The left main shaft support seat, the left bearing seat and the stator are all slidably connected to the side slide rail through sliders. The slider can be locked on the bottom slide rail or the side slide rail through a locking member; the movable frame driving mechanism drives the movable frame to slide along the bottom slide rail through a gear-rack transmission; a gear shaft bearing seat is arranged at the position corresponding to the right gear shaft on the frame base, and the right gear shaft is installed on the gear shaft bearing seat.

[0013] Preferably, the movable rack driving mechanism includes a second servo motor, a rack, and a driving gear. The second servo motor is disposed on the end face of the movable rack away from the fixed rack. The second servo motor is connected to the driving gear through a second coupling. A groove structure is axially formed on the rack base along 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.

[0014] Preferably, the synchronous rotation transmission mechanism further includes a valve seat and a valve seat connecting shaft. One ends of the left main shaft and the right main shaft close to the welding lap joint surface are hollow structures, and the hollow structures are threaded holes. 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 liner through the valve seat connecting shaft, and the right main shaft is connected to the valve seat located on the right inner liner through the valve seat connecting shaft.

[0015] In the second aspect of the present invention, a laser transmission welding clamping method for an IV-type hydrogen storage bottle inner liner with adjustable aspect ratio is further provided, including the following steps: Place the left inner liner in the left clamping device and connect it to the left main shaft, and place the right inner liner in the right clamping device and connect it to the right main shaft; place all the sliders in the unlocked state, drive the movable rack towards the fixed rack until the distance between the welding lap joint surfaces of the left inner liner and the right inner liner is within the set range; lock all the sliders between the movable rack and the bottom slide rail to keep the position of the movable rack unchanged; open the linear cylinder for pre-pressurization so that the welding lap joint surfaces of the left inner liner and the right inner liner are completely attached and have a preset pressure; adjust the position of the inner liner circumferential clamping mechanism so that the flexible clamping pieces on both sides of the rotor are in contact with the inner liner cylinder section after clamping; lock the sliders at both radial ends of the stator to keep the position of the inner liner circumferential clamping mechanism unchanged; increase the air pressure of the linear cylinder to continue pressing the welding lap joint surfaces of the left inner liner and the right inner liner, and make the pressing force of the welding lap joint surfaces reach the pressing force required for welding; open the clamping cylinder to circumferentially clamp the left inner liner and the right inner liner; start the synchronous rotation transmission mechanism to make the left inner liner and the right inner liner rotate synchronously, and at this time, perform laser transmission welding on the welding positions of the left inner liner and the right inner liner.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This device solves the problems faced by the plastic inner liner of the current IV-type high-pressure hydrogen storage bottle during the welding process, such as low welding quality, poor uniformity, large misalignment deviation, low yield rate and efficiency. The device integrates four core mechanisms: the centering track driving mechanism, the inner liner circumferential clamping mechanism, the synchronous rotation transmission mechanism, and the axial pressing mechanism. Each structure works together to significantly improve the overall performance of the welding process.

[0017] Among them, the axial pressure mechanism can not only accurately apply the pressing force required for welding, but also ensure the synchronous rotation of the left and right inner liners, guaranteeing the stability of welding. The inner liner circumferential clamping mechanism effectively prevents the deformation of the plastic inner liner caused by pressurization, further improving the centering accuracy of the left and right inner liners and having 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 speeds of the left and right inner liners, effectively avoiding welding unevenness caused by speed differences and even potential damage to the weld structure, ensuring the uniformity and integrity of welding. For the centering track drive mechanism, through the precisely designed linear guide layout, ultra-high-precision centering of the left and right inner liners is achieved, making the welding misalignment uniform, and at the same time showing wide adaptability to inner liners of different lengths, further enhancing the flexibility and versatility of the equipment.

[0018] The present invention makes up for the defects of the current laser transmission welding clamping equipment for injection-molded inner liners of type-IV high-pressure hydrogen storage cylinders, and also successfully realizes the efficient and high-quality welding of multi-specification plastic inner liners, providing strong technical support for the long-term safe service of type-IV high-pressure hydrogen storage cylinders and significantly improving the manufacturing level and product reliability of the entire industry. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the overall assembly structure schematic diagram of the type-IV hydrogen storage cylinder inner liner laser transmission welding clamping equipment with adjustable length-diameter ratio of the present invention; Figure 2 is the structural schematic diagram of the axial pressure mechanism of the present invention; Figure 3 is Figure 2 the detailed structural schematic diagram of the connection part between the left main shaft and the left bearing seat in Figure 4 is the side view of the inner liner circumferential clamping mechanism of the present invention; Figure 5 is the top view of the inner liner circumferential clamping mechanism of the present invention; Figure 6 is Figure 4 the structural schematic diagram of the stator in Figure 7 is Figure 4 the structural schematic diagram of the rotor in Figure 8 is Figure 4 the connection part between the stator and the rotor in Schematic cross-sectional view from a perspective; Figure 9 is Figure 4 the cross-sectional schematic view of the connection part between the stator and the rotor in a perspective; Figure 10 is Figure 4 the detailed structural schematic view of the type-I joint and the Y-shaped chassis in; Figure 11 is the structural schematic view of the transmission route of the synchronous rotation transmission mechanism of the present invention; Figure 12 is Figure 11 the structural schematic view of the synchronous belt transmission mechanism in; Figure 13 is Figure 12 the detailed structural schematic view of the smooth idler gear part in; Figure 14 is a schematic view of the laser transmission welding lap joint surface of a plastic inner liner.

[0021] 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 - driving gear; 109 - second coupling; 201 - stator; 2011 - air passage hole; 2012 - seal installation groove; 202 - rotor; 2021 - circumferential groove; 2022 - radial hole; 2023 - boss; 2024 - axial hole; 203 - clamping cylinder; 204 - circular chassis; 205 - Y-shaped chassis; 206 - flexible clamping piece; 207 - seal; 301 - left main shaft; 302 - right main shaft; 3031 - left main shaft support seat; 3032 - right main shaft support seat; 304 - first servo motor; 305 - sun gear; 306 - planetary tension pulley; 307 - planetary transmission wheel; 308 - smooth idler gear; 309 - synchronous belt; 310 - idler gear shaft; 311 - idler gear shaft mounting block; 312 - first coupling; 313 - left gear shaft; 314 - right gear shaft; 315 - main shaft 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 inner liner; 502 - right inner liner. Detailed implementation mode

[0022] Combined with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0023] It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those 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 do not have any substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should fall within the scope covered by the technical content disclosed in 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.

[0024] The present invention provides an embodiment: As Figures 1 to 14 shown, a laser transmission welding clamping device for the inner liner of a type-IV hydrogen storage cylinder with adjustable aspect ratio includes a centering track driving mechanism, an inner liner circumferential clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressing mechanism; The centering track driving mechanism is used to adjust the distance at the welding lap joint 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 be locked after sliding to a set distance; The inner liner circumferential clamping mechanism includes 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 both the left clamping device and the right clamping device are slidably arranged on the movable frame 101 and can be locked; 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, 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 act, and the gear transmission mechanism is connected to the left main shaft 301 and the right main shaft 302, and the gear transmission mechanism is used to drive the left main shaft 301 and the right main shaft 302 to rotate synchronously; 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 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 spindle 301, the right spindle 302, the left spindle support seat 3031, the right spindle 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.

[0025] In this embodiment, the structures of the left clamping device and the right clamping device are the same, both of which include: a stator 201, a rotor 202 and a plurality of clamping modules; the radial ends of the stator 201 are slidably connected to the movable frame 101 through 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 plurality of clamping modules are arranged circumferentially at intervals 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 through a pin, 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 sheet 206, so as to ensure that the force direction of the inner liner is always along the radial direction when clamped, and the inner surface of the flexible clamping sheet 206 is in close contact with the corresponding outer surface of the inner liner. The side of the flexible clamping sheet 206 in contact with the inner liner has a high friction characteristic 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 sheet 206 has a certain flexibility and elasticity, and when clamped, it closely fits the inner liner with the movement of the clamping cylinder 203 to adapt to the curvature of the inner liner with different radii. The flexible clamping sheet 206 always maintains surface contact with the inner liner rather than point contact and line contact, in order to make the inner liner evenly stressed and not deformed due to clamping. Four clamping modules are circumferentially arranged on one axial side of the rotor 202 at an interval of 90°, and four clamping modules are also circumferentially arranged on the other side at an interval 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.

[0026] Four air holes 2011 are radially formed on the stator 201. Figure 8 Among them, the four air holes 2011 are, from right to left, 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 cylinders 203 at the two side positions, and the air outlet hole of the clamping cylinders 203 at the two side positions. A circumferential groove 2021 communicated with the corresponding air hole 2011 is arranged on the rotor 202. A radial hole 2022 is formed in the circumferential 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 arranged at the boss 2023 between adjacent circumferential grooves 2021 to prevent air leakage. A sealing ring installation groove 2012 is formed on the stator 201 at the position corresponding to the sealing ring 207. An axial hole 2024 is formed on the side surface of the rotor 202, and the axial hole 2024 is connected with the radial hole 2022 in the corresponding circumferential groove 2021 to form an air path for providing air source for the clamping cylinder 203, realizing that the clamping module can rotate synchronously with the inner container without affecting the air pressure transmission.

[0027] The synchronous belt transmission mechanism includes a sun gear 305, a planetary tension pulley 306, a planetary transmission gear 307, a smooth idler pulley 308 and a synchronous belt 309. The axle shafts of the sun gear 305, the planetary tension pulley 306 and the planetary transmission gear 307 are all rotationally connected to the fixed frame 102. The axle shaft of the sun gear 305 is rotationally installed on the fixed frame 102, and the sun gear 305 is installed at a position close to the welding lap joint surface on the axle shaft of the sun gear 305 and is positioned by key connection. The planetary tension pulley 306 is located directly above the sun gear 305 and is installed at the end of the axle shaft of the planetary tension pulley 306 and is positioned by key connection; the axle shaft of the planetary tension pulley 306 is rotationally installed on the fixed frame 102. The planetary transmission gears 307 are symmetrically arranged on both sides of the sun gear 305, the smooth idler pulley 308 is symmetrically arranged inside the planetary transmission gears 307 with respect to the sun gear 305, and one end of the idler shaft 310 of the smooth idler pulley 308 is provided with a thread. The idler shaft 310 is threadedly connected with an idler shaft mounting block 311, so that the force on 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 through a locking bolt; a tension bolt mounting block is arranged below the idler shaft mounting block 311, and the tension bolt mounting block is screwed to the fixed frame 102 with screws. The position of the smooth idler pulley 308 is adjusted by tightening and loosening the tension bolt to achieve the purpose of tensioning. The sun gear 305, the planetary tension pulley 306, the planetary transmission gear 307 and the smooth idler pulley 308 are connected by the synchronous belt 309. The first servo motor 304 is connected with the axle shaft of the sun gear 305 through a first coupling 312, and the first servo motor 304 is installed on the fixed frame 102.

[0028] The gear transmission mechanism includes a left gear shaft 313, a right gear shaft 314 and a main shaft transmission gear 315. The axial section of one end of the left gear shaft 313 away from the right gear shaft 314 is circular. One end of the left gear shaft 313 away from the right gear shaft 314 is rotatably connected to the movable frame 101. One 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 slidably connected with clearance fit, so that the left gear shaft 313 can slide in the right gear shaft 314 while transmitting torque, realizing the axial pressing function. One end of the right gear shaft 314 away from the left gear shaft 313 is rotatably connected to the fixed frame 102. The planetary transmission wheel 307 is installed on the shaft section of the right gear shaft 314. One end of the right gear shaft 314 away from the welding lap joint 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. The main shaft transmission gear 315 is circumferentially positioned with the corresponding shaft by key connection, and is axially positioned by using a shaft shoulder and a screw locking ring at the same time; Among them, the main shaft transmission gear 315 on the left main shaft 301 meshes and drives with the left gear shaft 313, and the main shaft transmission gear 315 on the right main shaft 302 meshes and drives with the right gear shaft 314.

[0029] The centering track driving mechanism further 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 rails are longer and extend 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 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. 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 sliders. The sliders can be locked on the bottom slide rail 104 or the side slide rail 105 through locking parts; The movable frame driving mechanism drives the movable frame 101 to slide along the bottom slide rail 104 through gear-rack transmission; A gear shaft bearing seat 316 is arranged at the position corresponding to the right gear shaft 314 on the frame base 103. The right gear shaft 314 is installed on the gear shaft bearing seat 316, and the bearing seat of the gear shaft bearing seat 316 is a stud vertical bearing seat. Both the movable frame 101 and the fixed frame 102 are in the shape of "semi-H", with the openings facing each other, and the movable frame 101 is wider than the fixed frame 102. Therefore, the movable frame 101 can have a large space to move to the right to weld plastic inner liners of different lengths.

[0030] 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 circumferentially positioned through a key connection, and axial positioning is achieved by using a shaft shoulder and a screw locking retainer at the same time. A groove structure is axially formed on the rack 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 in meshing transmission.

[0031] The synchronous rotation transmission mechanism further includes a valve seat 317 and a valve seat connecting shaft 318. One ends of the left main shaft 301 and the right main shaft 302 close to the welding lap joint surface are hollow structures, and the hollow structures are threaded holes. 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 on the left inner liner 501 through the valve seat connecting shaft 318, and the right main shaft 302 is connected to the valve seat 317 on the right inner liner 502 through the valve seat connecting shaft 318.

[0032] In the axial pressure applying mechanism, both radial ends of the left bearing seat 403 are connected to the corresponding sliders, and are arranged on the side slide rails 105 of the movable frame 101, so that it only moves linearly along the side slide rails 105 without rotating. The right bearing seat 404 is directly fastened to the fixed frame 102.

[0033] The present invention also provides a laser transmission welding clamping method for an IV-type hydrogen storage bottle inner liner with an adjustable length-diameter ratio, including the following steps: S101: Place the left inner liner 501 in the left clamping device and connect it to the left main shaft 301, and place the right inner liner 502 in the right clamping device and connect it to the right main shaft 302; S102: Place all the sliders in the unlocked state, drive the movable frame 101 to move towards the fixed frame 102 until the distance between the welding lap joint surfaces of the left inner liner 501 and the right inner liner 502 is within 5 cm; S103: Lock all the sliders between the movable frame 101 and the bottom slide rail 104, and keep the position of the movable frame 101 unchanged; S104: Open the linear cylinder 401 for pre-pressure application, so that the welding lap joint surfaces of the left inner liner 501 and the right inner liner 502 are completely attached and have a preset pressure; S105: Adjust the position of the inner liner circumferential clamping mechanism, so that the flexible clamping pieces 206 on both sides of the rotor 202 are in contact with the inner liner cylinder section after clamping; S106: Lock the sliders at both radial ends of the stator 201 to keep the position of the inner liner circumferential clamping mechanism unchanged; S107: Increase the air pressure of the linear cylinder 401 to continue pressing the welding lap joints of the left inner liner 501 and the right inner liner 502, and make the pressing force of the welding lap joints reach the required pressing force for welding; S108: Open the clamping cylinder 203 to circumferentially clamp the left inner liner 501 and the right inner liner 502; 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.

[0034] As mentioned above, only the preferred specific embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A laser transmission welding clamping device for the inner liner of a type-IV hydrogen storage cylinder with adjustable aspect ratio, characterized in that: It includes a centering track driving mechanism, an inner liner circumferential clamping mechanism, a synchronous rotation transmission mechanism, and an axial pressing mechanism; The centering track driving mechanism is used to adjust the distance at the welding lap joint 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 be locked after sliding to a set distance; The inner liner circumferential clamping mechanism includes 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 both the left clamping device and the right clamping device are slidably arranged on the movable frame (101) and can be locked; 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), 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 act, and the gear transmission mechanism is connected to the left main shaft (301) and the right main shaft (302), and the gear transmission mechanism is used to drive the left main shaft (301) and the right main shaft (302) to rotate synchronously; The axial pressing mechanism includes a linear cylinder (401), a flange (402), a left bearing seat (403), and a right bearing seat (404). 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) through the flange (402), the left bearing seat (403) is slidably connected to the movable frame (101) and can be locked, one 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 one 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 adjustable aspect ratio according to claim 1, characterized in that: The structures of the left clamping device and the right clamping device are the same, and both include: a stator (201), a rotor (202) and a number of clamping modules; The stator (201) is slidably connected to the movable frame (101) and can be locked. The rotor (202) is rotatably connected inside the stator (201). A number of clamping modules are circumferentially spaced along the side of the rotor (202). The clamping module includes a clamping cylinder (203), a circular chassis (204), a Y-shaped chassis (205) and a flexible clamping piece (206). 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). The piston rods of the two clamping cylinders (203) located on both sides of the clamping module have I-shaped joints, and the I-shaped joints are connected to the Y-shaped chassis (205) by pins. The lower ends of the circular chassis (204) and the Y-shaped chassis (205) are fixedly embedded in the embedding grooves on the outer surface of the flexible clamping piece (206), and the inner surface of the flexible clamping piece (206) is in fitting contact with the outer surface of the corresponding inner tank.

3. The laser transmission welding clamping device for the inner liner of the type-IV hydrogen storage cylinder with adjustable aspect ratio according to claim 2, wherein: A number of air holes (2011) are radially provided on the stator (201). A circumferential groove (2021) communicating with the corresponding air holes (2011) is provided on the rotor (202). A radial hole (2022) is provided in the circumferential 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 circumferential grooves (2021). An axial hole (2024) is provided on the side surface of the rotor (202), and the axial hole (2024) is connected to the radial hole (2022) in the corresponding circumferential groove (2021) to form an air path for providing air source for the clamping cylinder (203).

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

5. The laser transmission welding clamping device for the inner liner of the type-IV hydrogen storage cylinder with adjustable aspect ratio according to claim 4, 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). One end of the left gear shaft (313) away from the right gear shaft (314) is rotatably connected to the movable frame (101). One 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 connected by a clearance fit and sliding connection. One end of the right gear shaft (314) away from the left gear shaft (313) is rotatably connected to the fixed frame (102). The planetary transmission wheel (307) is installed on the shaft section of the right gear shaft (314). A main shaft transmission gear (315) is connected to each of the left main shaft (301) and the right main shaft (302). Among them, the main shaft transmission gear (315) on the left main shaft (301) meshes and drives with the left gear shaft (313), and the main shaft transmission gear (315) on the right main shaft (302) meshes and drives with the right gear shaft (314).

6. The laser transmission welding clamping device for the liner of the type-IV hydrogen storage cylinder with adjustable aspect ratio according to claim 5, characterized in that: The centering track driving mechanism further 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 movable frame (101) is slidably connected to the bottom slide rail (104) through 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). 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 sliders. 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 arranged at the position corresponding to the right gear shaft (314) on the frame base (103), and the right gear shaft (314) is installed on the gear shaft bearing seat (316).

7. The laser transmission welding clamping device for the liner of the type-IV hydrogen storage cylinder with adjustable aspect ratio according to claim 6, wherein: 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 driving gear (108) through a second coupling (109). 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 in meshing transmission.

8. The laser transmission welding clamping device for the inner liner of the type-IV hydrogen storage cylinder with adjustable aspect ratio according to claim 5, wherein: The synchronous rotation transmission mechanism further 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 welding lap joint 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) 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) on the right inner tank (502) through the valve seat connecting shaft (318).

9. A laser transmission welding clamping method for the inner liner of a type-IV hydrogen storage cylinder with adjustable aspect ratio, based on the laser transmission welding clamping device for the inner liner of a type-IV hydrogen storage cylinder with adjustable aspect ratio according to any one of claims 1 to 8, characterized in that, It includes the following steps: Place the left inner tank (501) in the left clamping device and connect it to the left main shaft (301), and place the right inner tank (502) in the right clamping device and connect it to the right main shaft (302); Put all the sliders in the unlocked state, drive the movable frame (101) to move towards the fixed frame (102) until the distance between the welding lap joints of the left inner tank (501) and the right inner tank (502) is within the 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) for pre-pressurization so that the welding lap joints of the left inner tank (501) and the right inner tank (502) are completely attached and have a preset pressure; Adjust the position of the inner tank circumferential clamping mechanism so that the flexible clamping pieces (206) on both sides of the rotor (202) are in contact with the inner tank cylinder section after clamping; Lock the sliders at both radial ends of the stator (201) to keep the position of the inner tank circumferential clamping mechanism unchanged; Increase the air pressure of the linear cylinder (401) to continue pressing the welding lap joints of the left inner tank (501) and the right inner tank (502), and make the pressing force of the welding lap joints reach the pressing force required for welding; Open the clamping cylinder (203) to circumferentially clamp the left inner tank (501) and the right inner tank (502); Start the synchronous rotation transmission mechanism to make the left inner tank (501) and the right inner tank (502) rotate synchronously, and at this time, perform laser transmission welding on the welding positions of the left inner tank (501) and the right inner tank (502).

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