Aluminum foil attaching machine for inner peripheral wall of bottom shell of gas generator

Abstract

The invention discloses an aluminum foil attaching machine for the inner circumferential wall of a bottom shell of a gas generator. The aluminum foil attaching machine comprises a feeding mechanism used for forming a feeding path, and an attaching unit and a die cutting unit which are sequentially arranged along the feeding path. The attaching unit comprises a first limiting wheel set capable of limiting a bottom shell to a preset attaching position, a feeding assembly for conveying aluminum foil to a preset material taking position, and an attaching head assembly capable of adsorbing the aluminum foil from the preset material taking position, moving to the preset attaching position, extending into the bottom shell and attaching the aluminum foil to the inner circumferential wall of the bottom shell. The die cutting unit comprises a second limiting wheel set capable of limiting the bottom shell to the preset die cutting position and a die cutting head assembly which is arranged at the preset die cutting position and can movably stretch into the bottom shell to conduct segmented die cutting on the aluminum foil attached to the inner circumferential wall of the bottom shell. Manual operation can be replaced, the repeated positioning precision of the attaching position of the aluminum foil on the inner circumferential wall of the bottom shell is improved by adopting a mode of firstly attaching and then segmental die cutting, and therefore the aluminum foil attaching quality and efficiency of the bottom shell are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum foil attaching equipment, and particularly relates to an aluminum foil attaching machine for the inner circumferential wall of a gas generator bottom shell. BACKGROUND

[0002] The gas generator is a core power component of an automobile airbag system, and the structure of the gas generator includes a shell cover and a bottom shell which are assembled with each other. A center hole is formed in the top of the shell cover, and an ignition assembly is press-fitted and fixed in the center hole. The bottom shell is a circular shell structure, and a gas generation chamber for accommodating gas generating agent is formed by a bottom wall and an annular side wall. An exhaust hole is formed in the annular side wall to communicate with the chamber, and an aluminum foil needs to be attached to the inner circumferential wall of the bottom shell to seal the exhaust hole, so as to prevent the gas generating agent from being drenched and leaking. When the gas generator receives a preset current signal, the ignition assembly triggers the gas generating agent to burn, and the high-pressure gas generated by the burning of the gas generating agent breaks through the aluminum foil at the exhaust hole and is sprayed out, so as to push the airbag to expand rapidly and stably.

[0003] At present, the aluminum foil attaching process for the inner circumferential wall of the bottom shell of the gas generator relies on manual operation. The process flow is as follows: first, the aluminum foil roll is manually cut according to a preset size, and then the cut aluminum foil segments are attached to the exhaust hole corresponding positions of the inner circumferential wall of the bottom shell one by one. However, since the aluminum foil itself has weak rigidity, the aluminum foil is easily broken or wrinkled due to hand shaking and uneven force during manual operation, so that air bubbles, wrinkles or local virtual attachment defects are formed between the aluminum foil and the inner circumferential wall of the bottom shell. Long-term use can also cause the problem of peeling off. Not only does this reduce the sealing performance of the gas generator, causing the internal gas generating agent to be drenched and deteriorated, but also causes stress to concentrate on the peeling part or the defect area when the high-pressure gas generated by the burning of the gas generating agent, thereby causing the aluminum foil to break non-preset, directly affecting the stable release of the high-pressure gas, and endangering the expansion effect of the airbag.

[0004] In addition, the position accuracy of manual attachment is difficult to accurately control, and the aluminum foil attachment positions of different bottom shells have poor consistency, which further aggravates the instability of the attachment quality. At the same time, since the annular side wall of the bottom shell is usually provided with multiple exhaust holes, the aluminum foil roll needs to be pre-cut into corresponding number of aluminum foil segments, and then attached to the exhaust hole corresponding positions one by one. This operation mode not only has a complicated process, but also reduces the production efficiency, and is difficult to meet the needs of batch production. SUMMARY

[0005] The purpose of the present application is to provide an aluminum foil attaching machine for the inner circumferential wall of a gas generator bottom shell, which can replace manual operation to attach aluminum foil into the bottom shell, so as to improve the aluminum foil attachment quality and efficiency of the bottom shell.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] The application discloses an aluminum foil attaching machine for inner circumferential wall of bottom shell of gas generator, which comprises a feeding mechanism for forming a feeding path, and an attaching unit and a die-cutting unit arranged along the feeding path; the attaching unit comprises a first limiting wheel set for limiting the bottom shell at a preset attaching position, a feeding assembly for feeding the aluminum foil to the preset feeding position, and an attaching head assembly capable of extending into the bottom shell at the preset attaching position to attach the aluminum foil to the inner circumferential wall of the bottom shell after the aluminum foil is adsorbed from the preset feeding position; the die-cutting unit comprises a second limiting wheel set for limiting the bottom shell at a preset die-cutting position, and a die-cutting head assembly arranged at the preset die-cuting position and capable of extending into the bottom shell to die-cut the aluminum foil attached to the inner circumferential wall of the bottom shell.

[0008] Based on the above technical scheme, the application can be improved as follows:

[0009] Further, the first limiting wheel set and the second limiting wheel set are of the same structure, and each comprises a driving wheel, a driving wheel driving motor for driving the driving wheel to rotate around an axis, two driven wheels movably arranged opposite to the driving wheel, and a driven wheel driving member for driving the two driven wheels to move synchronously;

[0010] When the driven wheel driving member drives the driven wheels to move towards the driving wheel, the wheel surfaces of the driving wheel and the two driven wheels form three-point line contact with the outer circumferential surface of the bottom shell, so as to limit the bottom shell radially at the preset attaching position;

[0011] When the driving wheel driving motor drives the driving wheel to rotate, the bottom shell limited radially is driven to rotate, and the two driven wheels rotate synchronously with the bottom shell.

[0012] Further, the feeding assembly comprises unwinding components, notch components, separating components, traction components and winding components arranged along a feeding path in sequence.

[0013] When the unwinding components release the aluminum foil, the notch components form notches on the attaching layer of the aluminum foil, and the attaching layer and the release paper layer of the aluminum foil are separated when passing through the separating components; the attaching layer after separation is adsorbed by the attaching head assembly at the preset feeding position, and the release paper layer is pulled to the winding components by the traction components to complete winding.

[0014] Further, the attaching head assembly comprises a movable movable frame, a suction mark drum rotatably arranged on the movable frame, and a suction mark drum driving motor drivingly connected with the suction mark drum; a negative pressure chamber is formed in the suction mark drum, air suction holes are formed in the circumferential wall of the suction mark drum, and the top end of the suction mark drum is connected in communication with an external negative pressure member through a gas guide structure.

[0015] When the movable frame drives the suction mark drum to move to the preset feeding position, the attaching layer of the aluminum foil is adsorbed and attached to the outer circumferential wall of the suction mark drum through the adsorption force at the air suction holes.

[0016] Further, the incision component comprises a pad seat with a pad, a knife tip opposite to the pad, a movable incision knife, and an incision knife driving motor driving the incision knife; the knife tip and the pad form an incision channel in line with the feeding path;

[0017] When the aluminum foil passes through the incision channel along the preset feeding path, the incision knife driving motor drives the incision knife to feed towards the pad seat, and the incision is formed on the attached layer of the aluminum foil through the shearing cooperation between the knife tip and the pad.

[0018] Further, the separation component is a separation plate corresponding to the outlet end of the incision channel of the incision component, and the other end of the separation plate extends to the preset material taking position along the feeding path and forms a sharp separation head;

[0019] When the aluminum foil after incision is transported to the separation head along the guide surface of the separation plate, the release paper layer turns along the sharp angle of the separation head and is pulled to the winding component by the pulling component to complete winding; the attached layer peels off along the incision and forms an independent aluminum foil piece, which is transported to the preset material taking position and is adsorbed by the suction drum.

[0020] Further, the die cutting head assembly comprises a liftable lifting frame, a lifting cylinder driving the lifting frame to lift, a cutting knife movably assembled on the lifting frame, and a cutting knife driving motor driving the cutting knife; when the lifting frame moves downward, the cutting knife moves downward into the inner cavity of the bottom shell; when the cutting knife driving motor starts, the cutting knife feeds radially towards the inner peripheral wall of the pad seat to complete the cutting of the aluminum foil.

[0021] Further, it further comprises a hole detection unit arranged on the feeding path and located at the entrance end of the attached unit; the hole detection unit comprises a hole detection platform arranged on one side of the feeding mechanism, a supporting piece rotatably assembled on the hole detection platform, a photoelectric probe arranged on the circumferential side of the supporting piece, and a pressing piece vertically arranged above the supporting piece;

[0022] When the bottom shell to be attached with aluminum foil is sent to the hole detection platform, the bottom shell is supported by the supporting piece and the pressing piece moves downward to tightly press the bottom shell; the supporting piece rotates around its own axis and drives the bottom shell to rotate synchronously, and the photoelectric probe scans the exhaust hole of the bottom shell in the circumferential direction to complete the compliance detection of the exhaust hole.

[0023] Further, it further comprises a pressing unit arranged on the feeding path and located at the exit end of the die cutting unit; the pressing unit comprises a first supporting platform fixedly arranged on one side of the feeding mechanism, and a pressing assembly vertically assembled above the platform; the bottom shell after being attached with aluminum foil is sent to the first supporting platform at a preset pressing position, the pressing assembly vertically moves downward into the inner cavity of the bottom shell, expands radially after abutting against the bottom wall of the bottom shell, and presses the aluminum foil on the inner peripheral wall of the bottom shell.

[0024] Furthermore, it also includes a leak detection unit located in the feeding path and at the exit end of the pressing unit; the leak detection unit includes a second support platform fixed to one side of the feeding mechanism, and an inflation component that can be vertically lifted and lowered and mounted above the second support platform; the bottom shell after being attached with aluminum foil is sent to the preset leak detection position of the second support platform, the inflation component closes the top opening of the bottom shell, and inflates the bottom shell to detect leaks.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] This invention uses a first and a second limiting wheel set to limit the bottom shell during the application and die-cutting processes, respectively. By employing a method of applying the foil first and then cutting it in segments, the accuracy of the foil's repeated positioning on the inner circumference of the bottom shell is improved, achieving a high degree of consistency in the foil application position during mass production. An adsorption transfer method is used to transfer the foil from material handling to application, avoiding the foil breakage and wrinkling problems that easily occur in traditional manual operations, ensuring the integrity and flatness of the foil during application. Simultaneously, the die-cutting head assembly extends into the bottom shell to perform segmented die-cutting of the already applied foil, avoiding problems such as foil size deviation and loose adhesion caused by die-cutting before application. The entire application process eliminates the need for tedious manual steps such as foil cutting, positioning, and individual application, reducing human intervention and thus improving the quality and efficiency of foil application on the bottom shell. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a schematic diagram of the aluminum foil attaching machine on the inner peripheral wall of the gas generator bottom shell in this embodiment;

[0029] Figure 2 This is a top view of the aluminum foil attaching machine on the inner peripheral wall of the gas generator bottom shell in this embodiment;

[0030] Figure 3 This is a schematic diagram of the hole detection unit in this embodiment;

[0031] Figure 4 This is a schematic diagram of the attachment unit after removing the attachment head assembly and the feeding assembly in this embodiment;

[0032] Figure 5 for Figure 4 Enlarged view of section A in the image;

[0033] Figure 6 This is a schematic diagram of the feeding assembly in this embodiment;

[0034] Figure 7 for Figure 6 Enlarged view of section B in the image;

[0035] Figure 8 for Figure 6 Enlarged view of section C in the image;

[0036] Figure 9 This is a schematic diagram of the attachment head assembly in this embodiment;

[0037] Figure 10 This is a schematic diagram of the internal structure of the attachment head assembly in this embodiment;

[0038] Figure 11 This is a schematic diagram of the structure of the cutting component in this embodiment;

[0039] Figure 12 This is a schematic diagram of the die-cutting unit in this embodiment;

[0040] Figure 13 This is a schematic diagram of the die-cutting head assembly in this embodiment;

[0041] Figure 14 This is a schematic diagram of the structure of the clamping unit and the leak detection unit in this embodiment;

[0042] Figure 15 for Figure 14 Enlarged view of section D in the image;

[0043] Figure 16 for Figure 14 A magnified view of point E in the image.

[0044] The markings on the attached diagram are as follows: 1. Electric conveyor line; 2. Pushing cylinder; 3. Push block; 4. Collection box; 5. Unloading cylinder; 6. Push plate; 7. Inspection platform; 8. Photoelectric probe; 9. Support plate; 10. Support plate drive motor; 11. Fixed frame; 12. Movable plate; 13. Pressing cylinder; 14. Guide column; 15. First positioning block; 16. Attachment platform; 17. Drive wheel; 18. Drive wheel drive motor; 19. Driven wheel; 20. Driven wheel drive cylinder; 21. Fixed column; 22. U-shaped arm; 23. L-shaped stop; 24. Movable frame; 25. Label suction drum; 26. Label suction drum drive motor; 27. Connecting shaft; 28. Ventilation bushing; 29. ​​Loading platform; 30. First electric reel; 31. Second electric reel; 32. Guide roller; 33. Pad; 34. 35. Cutting blade; 36. Pad; 37. Blade holder; 38. Guide part; 39. Eccentric wheel; 40. Force-bearing wheel; 41. Guide rod; 42. Return spring; 43. Separating plate; 44. Separating head; 45. Guide groove; 46. Steering block; 47. Arc-shaped guide groove; 48. Active traction roller; 49. Driven traction roller; 50. Die-cutting platform; 51. Lifting frame; 52. Lifting cylinder; 53. Cutting blade; 54. Cutting blade drive motor; 55. Moving seat; 56. Guide part; 57. Guide rod; 58. First support platform; 59. Pressing cylinder; 60. Column; 61. Air drum; 62. Second support platform; 63. Inflation head; 64. Third positioning block; 65. Cutting blade drive motor; 66. Blade mounting rod; 67. Pressing cylinder. Detailed Implementation

[0045] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These descriptions are intended to aid in understanding the present invention but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] See Figures 1 to 16 This embodiment relates to an aluminum foil attaching machine for the inner peripheral wall of a gas generator bottom shell, including a hole inspection unit, an attaching unit, a die-cutting unit, a pressing unit, and a leak detection unit arranged sequentially along a feeding path, as well as a feeding mechanism for forming the feeding path; the two ends of the feeding mechanism are a loading end and a unloading end, respectively; the bottom shell to be attached with aluminum foil is loaded from the loading end of the feeding mechanism and conveyed along the feeding path, passing through the hole inspection unit, attaching unit, die-cutting unit, pressing unit, and leak detection unit in sequence, and after completing the corresponding process, it is unloaded from the unloading end of the feeding mechanism.

[0047] Specifically, in this embodiment, the feeding mechanism is an electric conveyor line 1, which can carry and transport the bottom shell. The structure and power driving principle of the electric conveyor line 1 are existing technologies and will not be described in detail here. The electric conveyor line 1 extends along the preset process direction to form a long linear feeding path, and on the side of the electric conveyor line 1, along the extension direction of the feeding path, there are sequentially divided a hole inspection station, a first waste station, an attachment station, a die-cutting station, a pressing station, a leak detection station, and a second waste station.

[0048] An inspection unit is set up at the inspection station to inspect the vent holes on the bottom shell within the inspection station. The inspection unit checks whether there are defects such as missing, redundant, or misaligned vent holes. Bottom shells that fail the inspection are sent to the first waste station for unloading, while bottom shells that pass the inspection are sent to the attachment station.

[0049] An attachment unit is set up at the attachment station to attach aluminum foil to the inner peripheral wall of the bottom shell in the attachment station, thereby sealing the vent hole. The bottom shell after attaching aluminum foil is then conveyed to the side leakage station.

[0050] A die-cutting unit is set up at the die-cutting station to divide the aluminum foil on the inner peripheral wall of the bottom shell within the die-cutting station into aluminum foil segments of a preset specification.

[0051] A pressing unit is set up at the pressing station to press the aluminum foil on the inner peripheral wall of the bottom shell within the pressing station;

[0052] A leak testing unit is set up at the leak testing station to test the airtightness of the bottom shell in the leak testing station. The unit detects whether there is a leak at the vent hole. Bottom shells that fail the test are conveyed to the second waste disposal station for unloading. Bottom shells that pass the test are conveyed to the unloading end of the electric conveyor line 1 for unloading.

[0053] Five pushing components are arranged on the side of the electric conveyor line 1. The five pushing components are respectively arranged in correspondence with the hole inspection station, the bonding station, the die-cutting station, the pressing station and the leak detection station, so as to push the bottom shell into the five stations respectively, and push it out of the station after completing the corresponding process, and continue to be conveyed by the electric conveyor line 1.

[0054] The feeding component includes an infeed arm and an ejection arm, which are arranged opposite each other on both sides of the electric conveyor line 1. The infeed arm and the ejection arm have the same structure, including a pusher cylinder 2 fixed to the side of the electric conveyor line 1 by a bracket, and a pusher block 3 connected to the piston rod extension end of the pusher cylinder 2. The extension and retraction direction of the piston rod of the pusher cylinder 2 is perpendicular to the feeding path of the electric conveyor line 1. When the piston rod of the pusher cylinder 2 moves in extension and retraction, it drives the pusher block 3 to move in the horizontal direction, so as to realize the push or ejection of the bottom shell at the corresponding work station.

[0055] The push block 3 has an arc-shaped groove on its outer side, and the outline of the arc-shaped groove matches the outer periphery of the bottom shell. When the push block 3 contacts the bottom shell, the outer periphery of the bottom shell and the arc-shaped groove of the push block 3 form a close-fitting surface contact structure, thereby increasing the contact area between the push block 3 and the bottom shell and effectively improving the stability of the bottom shell during movement.

[0056] Two waste removal components are installed on the side of the electric conveyor line 1. The two waste removal components are respectively arranged in correspondence with the first waste removal station and the second waste removal station, so as to unload the unqualified bottom shells from the electric conveyor line 1.

[0057] The waste discharge component includes an unloading arm and a collection box 4. The unloading arm is fixed to one side of the electric conveyor line 1, and the collection box 4 is fixed to the other side of the electric conveyor line 1 opposite to the unloading arm. The two are arranged correspondingly along the feeding path of the electric conveyor line 1. The unloading arm includes an unloading cylinder 5 fixed to the side of the electric conveyor line 1 by a bracket, and a push plate 6 connected to the extended end of the piston rod of the unloading cylinder 5. The extension and retraction direction of the piston rod of the unloading cylinder 5 is perpendicular to the feeding path of the electric conveyor line 1. When the piston rod of the unloading cylinder 5 extends, it drives the push plate 6 to move horizontally in the direction toward the collection box 4, so as to push the unqualified bottom shells toward the collection box 4, thereby realizing the unloading and collection of the unqualified bottom shells.

[0058] The inspection unit includes an inspection platform 7 located on one side of the electric conveyor line 1, a support rotatably mounted on the inspection platform 7, photoelectric probes 8 located around the support, and a pressing member that is vertically mounted above the support. The bottom shell to be coated with aluminum foil is pushed onto the inspection platform 7 by the push arm, supported by the support, and the pressing member moves downward and presses against the bottom shell. When the support rotates around its axis, it drives the bottom shell to rotate synchronously, and the photoelectric probes 8 perform circumferential scanning inspection of the vent holes of the bottom shell to complete the compliance inspection of the vent holes.

[0059] The inspection platform 7 is a plate-shaped structure with a circular mounting groove in the center of its top surface. The support includes a circular support plate 9 rotatably mounted in the mounting groove and a support plate drive motor 10 fixed to the bottom of the inspection platform 7. The output end of the support plate drive motor 10 extends vertically into the mounting groove and is coaxially driven and connected to the circular support plate 9. When the support plate drive motor 10 is started, it drives the circular support plate 9 to rotate relative to the inspection platform 7 in the mounting groove around its axis. The top surface of the circular support plate 9 is flush with the top surface of the inspection platform 7 to ensure that the bottom shell can be smoothly pushed in or pushed out along the top surface of the inspection platform 7.

[0060] The photoelectric probe 8 adopts the existing infrared photoelectric probe 8. The infrared photoelectric probe 8 is arranged around the support, and the detection end of the infrared photoelectric probe 8 faces the center of the support. The infrared photoelectric probe 8 has an infrared emitting end and an infrared receiving end, which are arranged in a counter-firing manner or a same-side reflective manner. It is used to emit an infrared detection beam and receive the reflected or penetrated infrared signal. When the bottom shell is pressed by the pressing member and rotates synchronously with the support, the infrared emitting end of the infrared photoelectric probe 8 continuously emits an infrared beam. The beam is received by the infrared receiving end after being directly shone or reflected by the outer peripheral surface of the bottom shell. If the exhaust hole on the bottom shell rotates into the detection path of the infrared photoelectric probe 8, the infrared beam will penetrate the exhaust hole or form a sudden change in the reflected signal, causing the signal intensity received by the infrared receiving end to change within a preset threshold range. It is determined that the exhaust hole exists and the hole diameter and hole position meet the preset requirements. If the infrared receiving end does not detect a change in signal intensity or the signal change exceeds the preset threshold, it is determined that the exhaust hole detection is unqualified.

[0061] The pressing component includes a fixed frame 11 fixed to the inspection platform 7, a movable plate 12 slidably mounted on the fixed frame 11, a pressing cylinder 13 drivenly connected to the movable plate 12, and a pressing block 14 fixed to the bottom surface of the movable plate 12. The fixed frame 11 is provided with a guide post 14 extending vertically, which slides with the movable plate 12 to guide the movable plate 12 to move vertically. When the piston rod of the pressing cylinder 13 extends downward, it drives the movable plate 12 to slide downward along the guide post 14, which drives the pressing block 14 to move downward synchronously and press against the bottom shell, thereby pressing the bottom shell. The pressing block 14 is a circular block structure, and the diameter of the pressing block 14 is larger than the diameter of the bottom shell.

[0062] Two first positioning blocks 15 are also fixed on the inspection platform 7. The two first positioning blocks 15 are arranged opposite each other in the mounting groove of the inspection platform 7. The opposite sides of the two first positioning blocks 15 are provided with inclined guide surfaces, and a V-shaped positioning groove is formed between the inclined guide surfaces of the two first positioning blocks 15. The wide end of the V-shaped positioning groove is connected to the electric transmission line 1 so that the push arm can push the bottom shell into the V-shaped positioning groove and position the bottom shell in the mounting groove of the inspection platform 7. The narrow end of the V-shaped positioning groove is set away from the electric transmission line 1 so that the push arm can extend into the V-shaped positioning groove and push out the bottom shell after the inspection is completed.

[0063] It should be noted that the inclined guide surfaces of the two first positioning blocks 15 are symmetrically arranged to form a V-shaped clamping space with a fixed cone angle. The cone angle is adapted to the outer circumferential contour of the bottom shell, preferably 60°~120°, to ensure two-point or line contact with the outer circumferential surface of the bottom shell. When the bottom shell is pushed into the V-shaped positioning groove by the push arm, the outer circumferential surface of the bottom shell contacts the two inclined guide surfaces. The guide surfaces generate a radial centering force through contact with the bottom shell. This force points along the normal direction of the guide surfaces toward the central axis of the V-shaped positioning groove, which can automatically offset the positioning error caused by position offset and small dimensional deviation during the pushing process of the bottom shell, so that the central axis of the bottom shell coincides with the central axis of the mounting groove of the inspection platform 7. At the same time, the groove wall of the V-shaped positioning groove forms a circumferential limit on the bottom shell, preventing the bottom shell from radially moving during the rotation inspection process. Finally, the bottom shell is positioned with high precision and high stability at the inspection station, providing a unified and stable inspection benchmark for the scanning inspection of the infrared photoelectric probe 8.

[0064] The bonding unit includes a bonding platform 16 fixed to one side of the electric conveyor line 1, a first limiting wheel set arranged on the bonding platform 16 for radially limiting the bottom shell, a bonding head assembly that can move vertically and horizontally, and a feeding assembly fixed to one side of the bonding platform 16 for feeding aluminum foil to the bonding head assembly. The bottom shell to be bonded with aluminum foil is pushed to the preset bonding position on the bonding platform 16 by the push arm, and radially limited by the first limiting wheel set to restrict the horizontal movement of the bottom shell during the bonding process. The bonding head assembly first adsorbs the aluminum foil fed to the preset picking position by the feeding assembly, then moves horizontally to directly above the bottom shell, and then descends vertically and extends into the inner cavity of the bottom shell. After the bonding head assembly is aligned with the preset bonding area on the inner wall of the bottom shell, the bonding head assembly releases the adsorption force on the aluminum foil, so that the aluminum foil is bonded to the preset bonding area on the inner wall of the bottom shell under its own tension force, thus completing the aluminum foil bonding.

[0065] The attachment platform 16 has a plate-like structure, with the center of its top surface designated as the preset attachment position after the bottom shell is pushed into place. The first limiting wheel assembly includes a drive wheel 17 rotatably mounted on the attachment platform 16, a drive wheel drive motor 18 driven by the drive wheel 17, two driven wheels 19 that can translate along the top surface of the attachment platform 16, and a driven wheel drive cylinder 20 that drives and connects the two driven wheels 19. When the piston rod of the driven wheel drive cylinder 20 extends, it drives the two driven wheels 19 to move synchronously towards the drive wheel 17, so that the drive wheel 17 and the two driven wheels 19 together radially limit the bottom shell to the preset attachment position on the attachment platform 16. At the attachment position, under radial limiting conditions, the driving wheel 17 and the two driven wheels 19 are tangentially arranged with the outer circumferential surface of the bottom shell, forming a three-point line contact limiting structure. When the driving wheel drive motor 18 starts, it drives the driving wheel 17 to rotate around its axis. Through the friction between the driving wheel 17 and the outer circumferential surface of the bottom shell, the bottom shell is driven to rotate synchronously around its own axis, providing circumferential feed motion for aluminum foil attachment. It should be noted that in this embodiment, a driven wheel drive cylinder 20 is used. Depending on the actual situation, other driven wheel drive components suitable for driving the translation of driven wheels in the prior art can also be used instead, such as electric telescopic rods or hydraulic cylinders.

[0066] The driving wheel 17 and two driven wheels 19 are distributed in an isosceles triangle along the outer periphery of the bottom shell. The two driven wheels 19 are symmetrically arranged on one side of the driving wheel 17, forming an adjustable three-point positioning clamping space. Utilizing the stability of the triangular structure, it ensures that the bottom shell will not shift radially after positioning. When the driven wheel drive cylinder 20 drives the two driven wheels 19 to synchronously approach the driving wheel 17, the wheel surfaces of the three wheels form a three-point line contact with the outer periphery of the bottom shell. During the contact process, the wheel surfaces generate a clamping force on the bottom shell that points radially toward the center of the bottom shell. This clamping force can automatically offset the positional changes that occur during the pushing process of the bottom shell. Offset and attitude deviation ensure that the central axis of the bottom shell coincides with the reference axis of the preset attachment position (i.e., the working reference axis of the attachment head assembly), achieving self-centering limit; the three-point line contact structure achieves radial clamping limit while converting the clamping force into rolling friction through the rotatable characteristics of the wheel; when the drive wheel 17 rotates, the friction drives the bottom shell to rotate synchronously, avoiding damage to the outer circumferential surface of the bottom shell caused by sliding friction between the bottom shell and the wheel, and ensuring the coaxiality accuracy during the rotation of the bottom shell, providing a stable motion reference for the attachment head assembly to uniformly attach to the inner wall of the bottom shell around the entire circumference.

[0067] The attachment platform 16 is also fixed with a first axial limiting member. The first axial limiting member has a first axial limiting part extending above the preset attachment position, so as to axially limit the bottom shell along its central axis and prevent the bottom shell from axially moving during the attachment process.

[0068] The first axial limiting component includes a fixed post 21 fixedly connected to the attachment platform 16, and a U-shaped arm 22 fixedly mounted on the top of the fixed post 21. The U-shaped arm 22 includes two parallel straight arm sections and a connecting section for connecting the two straight arm sections. The connecting section is fixedly connected to the top of the fixed post 21, so that the U-shaped arm 22 spans above the preset attachment position. An L-shaped stop 23 is fixedly mounted at the end of each of the two straight arm sections away from the connecting section. The L-shaped stop 23 is the first axial limiting part. A gap of a preset height is formed between the bottom surface of the horizontal section of the L-shaped stop 23 and the top surface of the attachment platform 16. The height of this gap is adapted to the axial height of the bottom shell, allowing the bottom shell to be pushed into the preset attachment position in the horizontal direction. When the bottom shell is pushed to the preset attachment position, the bottom surface of the horizontal section of the L-shaped stop 23 forms a stop fit with the top surface of the bottom shell. The vertical stop force restricts the upward displacement of the bottom shell along its own central axis, thereby achieving axial limiting of the bottom shell and providing a stable axial reference for the aluminum foil attachment process.

[0069] It should be noted that the gap between the L-shaped stop 23 and the top surface of the attachment platform 16 is slightly larger than the axial height of the bottom shell, ensuring smooth insertion of the bottom shell without radial interference. Simultaneously, the spanning structure of the U-shaped arm 22 ensures that the two L-shaped stop 23s are symmetrically distributed on both sides of the top of the bottom shell, forming a balanced stopping force point and preventing bottom shell attitude deviation caused by a single L-shaped stop 23. After the bottom shell is pushed into the preset attachment position horizontally, the top of the bottom shell forms a surface contact stop with the bottom surface of the horizontal section of the L-shaped stop 23. This stopping structure directly restricts the bottom shell's upward displacement freedom along its own central axis, working in conjunction with the attachment platform 16. The top surface provides support, forming a two-way axial constraint of bottom support and top stop, preventing axial movement of the bottom shell during the attachment process. The horizontal section of the L-shaped stop 23 has a smooth surface design and a non-compression stop with the top of the bottom shell, ensuring that when the bottom shell rotates under the drive of the first limit wheel set, the axial limit component will not generate additional friction or force that hinders rotation. This achieves decoupling of axial limit and circumferential rotation, ensuring not only the smooth rotation of the bottom shell but also maintaining axial positioning accuracy, providing dual reference guarantees for the attachment head assembly to uniformly attach the bottom shell to the inner wall of the entire circumference.

[0070] The labeling head assembly includes a movable frame 24 that can be lifted vertically and moved horizontally, a label-absorbing drum 25 that is rotatably mounted on the movable frame 24, and a label-absorbing drum drive motor 26 that is connected to the label-absorbing drum 25. The label-absorbing drum 25 has a sealed negative pressure chamber inside, and multiple air suction holes that communicate with the negative pressure chamber are evenly distributed on the periphery of the label-absorbing drum 25. The top of the label-absorbing drum 25 has an air extraction hole that communicates with the negative pressure chamber, and a hollow connecting shaft 27 is coaxially fixed to the air extraction hole. The top end of the connecting shaft 27 is closed, and the inner cavity of the connecting shaft 27 is connected to the negative pressure chamber of the label suction drum 25. The top end of the connecting shaft 27 is connected to the output end of the label suction drum drive motor 26 through a transmission component to realize the rotation drive of the label suction drum 25. A vent hole is opened on the peripheral wall of the connecting shaft 27 to connect to the inner cavity of the connecting shaft 27. A ventilated bushing 28 with a sealing fit is fitted at the vent hole. The ventilated bushing 28 is connected to an external negative pressure pump through a sealed pipe to form a negative pressure conduction path.

[0071] It should be noted that the movable frame 24 in this embodiment is a two-axis linkage movable frame 24 in the prior art. The movable frame 24 can be linked along the X-axis and Z-axis, wherein the X-axis is parallel to the conveying direction and the Z-axis is parallel to the vertical direction. In this embodiment, a negative pressure conduction structure is formed by the suction drum 25 with an air extraction hole, the connecting shaft 27 and the breathable bushing 28. Depending on the actual situation, other air guiding structures in the prior art that are suitable for forming a negative pressure passage with the suction drum 25 and the external negative pressure pump can also be used instead.

[0072] When the external negative pressure pump starts, negative pressure suction is input to the ventilated bushing 28 through the sealed pipe. The ventilated bushing 28 and the vent hole of the connecting shaft 27 form a sealed ventilated fit, allowing the negative pressure suction to be introduced into the inner cavity of the connecting shaft 27 through the vent hole. Since the inner cavity of the connecting shaft 27 is connected to the negative pressure chamber of the suction drum 25, the negative pressure suction is further conducted to the negative pressure chamber, creating a stable negative pressure environment inside the negative pressure chamber. The negative pressure chamber forms a uniformly distributed adsorption force through the suction holes on its peripheral wall. When the suction drum 25 moves to the preset material picking position, the suction holes on the peripheral wall of the suction drum 25 come into contact with the surface of the aluminum foil conveyed by the feeding component. Due to the adsorption force generated by the negative pressure at the suction holes, and the adsorption force being uniform along the circumference of the suction drum 25, the suction force is strong. The aluminum foil adheres tightly to the peripheral wall of the suction drum 25 under the action of adsorption force. At the same time, the cylindrical structure of the suction drum 25 allows the aluminum foil to be pre-formed into an arc shape that fits the inner wall of the bottom shell. During the adsorption process, the sealed fit design between the ventilated bushing 28 and the connecting shaft 27 ensures the airtightness of the negative pressure passage when the connecting shaft 27 rotates with the suction drum 25, avoiding negative pressure leakage that could lead to adsorption failure. When the suction drum 25, carrying the aluminum foil, extends into the inner cavity of the bottom shell and aligns with the preset attachment area, the external negative pressure pump stops working or cuts off the negative pressure passage, the negative pressure environment in the negative pressure chamber disappears, and the adsorption force at the suction hole is released. Under its own tension, the aluminum foil detaches from the peripheral wall of the suction drum 25 and adheres to the inner wall of the bottom shell, completing the aluminum foil attachment.

[0073] The feeding assembly includes a feeding platform 29, and an unwinding component, a guide roller group, a slitting component, a separating component, a traction component, and a winding component arranged sequentially on the feeding platform 29 along the feeding path. After the aluminum foil roll is unwound by the unwinding component, it is guided by the guide roller group and conveyed to the slitting component along the preset feeding path. The slitting component performs local slitting on the adhesive layer of the aluminum foil to form intermittent slitting. The distance between two adjacent slittings corresponds to the circumference of the inner peripheral wall of the bottom shell, and the slitting depth does not penetrate the release paper layer of the aluminum foil, thus preserving the integrity of the release paper layer. The aluminum foil after slitting continues to be conveyed. After being guided by the separating component, the adhesive layer and the release paper layer of the aluminum foil are peeled off along the separating surface of the separating component. At the same time, the adhesive layer forms a single aluminum foil sheet to be attached at the slitting point. The release paper layer is traction conveyed to the winding component by the traction component, and the winding component completes the winding and recycling. The separated aluminum foil sheet to be attached is adsorbed by the attachment head assembly at the preset material picking position to complete the feeding.

[0074] The unwinding component is a first electric reel 30, and the winding component is a second electric reel 31. The structures of the first electric reel 30 and the second electric reel 31 are completely identical, both including a reel body and a reel motor connected to the reel body for driving. The reel body is disc-shaped, with a material roller coaxially fixed at its center. The outer circumferential surface of the material roller is set as a winding surface for winding aluminum foil rolls or release paper layers. The reel motor is a servo motor, and its output end is connected to the material roller drive to drive the material roller to rotate synchronously. The aluminum foil roll is pre-wound on the material roller winding surface of the first electric reel 30. When the first electric reel 30 starts and rotates along the preset unwinding direction, the aluminum foil roll on the material roller is gradually released. The release paper layer, after being peeled off by the separating component, has its free end fixed to the material roller winding surface of the second electric reel 31. When the second electric reel 31 starts and rotates along the preset winding direction, the release paper layer is gradually wound and wound onto the material roller.

[0075] The guide roller assembly includes two identical guide rollers 32. One guide roller 32 is positioned on the unwinding side of the first electric reel 30 to receive the aluminum foil roll released from the first electric reel 30. The other guide roller 32 is positioned on the feeding side of the cutting component to guide the aluminum foil roll towards the cutting component. The free end of the aluminum foil roll released from the first electric reel 30 is sequentially wound around the outer circumference of the two guide rollers 32. After the conveying direction is adjusted by the steering and limiting action of the guide rollers 32, it enters the cutting component to complete the cutting of the adhesive layer. The number of guide rollers 32 can be increased or decreased according to actual guiding needs.

[0076] The slicing component includes a base 33 fixed on the loading platform 29, a slicing blade 34 movably mounted on the loading platform 29, and a slicing blade drive motor 65 driven by the slicing blade 34. The top surface of the base 33 has a pad portion 35 adapted to the blade tip structure of the slicing blade 34. The blade tip of the slicing blade 34 and the pad portion 35 of the base 33 are arranged opposite each other, forming a slicing channel through which the aluminum foil passes along the loading path. The feeding paths are laid out in a co-linear manner to ensure the continuity of aluminum foil conveying. When the aluminum foil is conveyed along the preset feeding path and passes through the cutting channel, the cutting knife drive motor 65 starts and drives the cutting knife 34 to make a feeding motion in the direction toward the pad 33. The tip of the cutting knife 34 forms a shearing engagement with the pad portion 35 of the pad 33 to perform periodic cutting processing on the bonding layer of the aluminum foil to a preset depth. The cutting depth does not penetrate the release paper layer of the aluminum foil to preserve the integrity of the release paper layer.

[0077] The pad 33 is a rectangular block structure that is detachably fixed to the loading platform 29 by bolts. The top surface of the pad 33 is integrally formed with a long strip plate-shaped pad 35. The side of the pad 35 facing the cutting knife 34 forms a flat and smooth support pad surface. This support pad surface is used to support the aluminum foil passing through the cutting channel, providing a stable reference for the shearing engagement between the cutting knife 34 and the pad 35, thereby ensuring the cutting accuracy of the aluminum foil adhesive layer and the flatness of the cutting edge.

[0078] The sizing blade 34 is slidably mounted on the loading platform 29 along the cutting direction via the blade holder 36, and the cutting direction of the sizing blade 34 is perpendicular to the support pad surface of the pad 33. The blade holder 36 includes a mounting end for clamping the sizing blade 34, a transmission end for transmitting power, and a guide portion 37 located between the mounting end and the transmission end. The mounting end of the blade holder 36 detachably clamps and fixes the sizing blade 34 by bolts, and the transmission end of the blade holder 36 is connected to the output end of the sizing blade drive motor 65 via a transmission assembly. When the sizing blade drive motor 65 is started, power is transmitted to the sizing blade drive motor 65 via the transmission assembly. The tool holder 36 is driven to move directionally along a preset cutting direction, causing the cutting blade 34 to feed towards the support pad surface of the pad 33, completing the cutting of the aluminum foil adhesion layer; a guide rod 40 extending along the cutting direction is fixed on the loading platform 29, and the guide part 37 of the tool holder 36 forms a sliding fit with the guide rod 40 to constrain the movement trajectory of the tool holder 36 and ensure the accuracy of the feed direction of the cutting blade 34; a reset part is sleeved on the guide rod 40 to drive the tool holder 36 and the cutting blade 34 to reset to the initial position after the cutting is completed, in preparation for the next cutting action.

[0079] The transmission assembly includes an eccentric wheel 38 fixed to the output end of the cutting blade drive motor 65, and a force-receiving wheel 39 rotatably mounted on the transmission end of the tool holder 36. The wheel surfaces of the eccentric wheel 38 and the force-receiving wheel 39 are in rolling tangential engagement, forming a cam transmission structure, which is used to convert the rotational torque output by the cutting blade drive motor 65 into a linear driving force of the tool holder 36 along the cutting direction, and realize the periodic reciprocating movement of the tool holder 36. The eccentricity of the eccentric wheel 38 is adapted to the preset cutting stroke.

[0080] The guide portion 37 of the tool holder 36 is integrally formed on one side of the tool holder 36. The guide portion 37 has a guide rod hole that is clearance-fitted with the guide rod 40. The inner wall of the guide rod hole is a smooth wall surface to reduce sliding friction with the guide rod 40. The two ends of the guide rod 40 are fixed to the loading platform 29 by support blocks to form a cantilever support structure with fixed ends, ensuring the straightness and installation stability of the guide rod 40. The reset component is a reset spring 41. The reset spring 41 is sleeved on the guide rod 40 in a pre-compressed state. One end of the reset spring 41 abuts against the end face of the guide portion 37 of the tool holder 36, and the other end abuts against the end face of the support block on the loading platform 29. The tool holder 36 is automatically reset by the elastic force of the reset spring 41.

[0081] The separating component is a separating plate 42 fixed on the feeding platform 29. The separating plate 42 has a long strip-shaped plate structure. One end of the separating plate 42 is opposite to the exit end of the cutting channel of the cutting component and is used to receive the aluminum foil after cutting. The other end of the separating plate 42 extends along the feeding path to the preset material picking position, and the end is integrally formed with a sharp-angled separating head 43. The sharp angle of the separating head 43 is set to 30°-60°. When the aluminum foil after cutting is conveyed to the separating head 43 along the guide surface of the separating plate 42, the adhesive layer and the release paper layer of the aluminum foil are peeled off and separated. The separated adhesive layer is conveyed to the preset material picking position along the guide surface of the separating head 43 and is attracted and fixed by the suction drum 25 of the adhesive head assembly. The release paper layer changes the conveying direction after passing the sharp end of the separating head 43 and is pulled to the second electric reel 31 by the traction component to complete the winding and recycling.

[0082] The elongated structure of the separating plate 42 ensures the straightness of the aluminum foil conveying. The separating head 43 is designed with an acute angle of 30°-60°, forming a forced guiding path for straight conveying and sharp-angle turning. When the aluminum foil is conveyed to the separating head 43, the release paper layer, due to its certain toughness, can achieve a large-angle turn following the sharp-angle contour of the separating head 43. After the aluminum foil's adhesive layer is processed by the cutting component, it has formed intermittent cuts, which destroys its structural integrity. Moreover, the interfacial adhesion between the adhesive layer and the release paper layer is less than the tensile strength of the release paper layer and the adsorption force between the adhesive layer and the label drum 25. It cannot follow the release paper layer to complete a large-angle turn, thus causing interlayer stress concentration at the sharp corner of the separating head 43.

[0083] Intermittent cuts are formed on the adhesive layer, dividing it into several independent aluminum foil sheets to be attached. When the interlayer stress generated by the separation head 43 acts on the adhesive layer, the stress will preferentially concentrate at the cuts, causing the adhesive layer to break along the cut contour and form a single independent aluminum foil sheet to be attached. This avoids defects such as tearing and adhesion during the peeling of the adhesive layer and ensures the integrity of the adhesive layer after peeling.

[0084] When the aluminum foil adhesive layer is about to peel off at the sharp corner of the separating head 43 due to stress concentration, the suction drum 25 of the adhesive head assembly has moved to the preset material picking position. The suction holes on the peripheral wall of the suction drum 25 generate negative pressure adsorption force. This negative pressure adsorption force acts directly on the surface of the adhesive layer that is about to be peeled off, forming a dual force of mechanical peeling by the separating head 43 and negative pressure traction by the suction drum 25. At the same time, the second electric reel 31 applies continuous winding tension to the release paper layer through the traction component, causing the release paper layer to be rapidly conveyed after turning along the separating head 43, further increasing the separation distance between the adhesive layer and the release paper layer, and finally achieving complete peeling of the two. The adhesive layer is adsorbed and fixed by the suction drum 25, while the release paper layer is continuously wound and recycled.

[0085] The plate surface of the separating plate 42 that is in contact with the aluminum foil is the guide surface. The separating plate 42 has a long strip-shaped guide groove 44 on the guide surface. The width of the guide groove 44 is adapted to the width of the aluminum foil so as to form lateral limiting and guiding of the aluminum foil during the conveying process.

[0086] It should be noted that the width of the guide groove 44 corresponds to the design width of the aluminum foil. The two side walls of the guide groove 44 form a bidirectional lateral constraint on the edge of the aluminum foil, which can effectively limit the left and right movement of the aluminum foil caused by tension fluctuations, structural changes after the pre-treatment of the cut marks, or equipment vibration during the conveying process, ensuring that the aluminum foil is always along the central axis of the guide groove 44, and preventing the edge of the aluminum foil from exceeding the separation plate 42 or deviating from the separation head 43.

[0087] The bottom of the guide trough 44 is a flat and smooth support surface. When the aluminum foil is conveyed against the bottom of the trough, compared with flat conveying, the bottom of the guide trough 44 and the lower part of the side walls form a semi-enclosed support structure, which increases the contact area between the separating plate 42 and the aluminum foil and improves the stability of the support. At the same time, the smooth walls and bottom of the trough can reduce the frictional resistance when the aluminum foil is conveyed, avoid aluminum foil wrinkles and jamming caused by uneven friction, and ensure that the aluminum foil is conveyed to the separating head 43 in a flat posture.

[0088] The feeding platform 29 is fixed with a turning block 45 at a preset material picking position. The turning block 45 has an arc-shaped guide groove 46 on the side facing the label-absorbing drum 25, which is adapted to the outer peripheral contour of the label-absorbing drum 25. When the label-absorbing drum 25 moves to the preset material picking position, the outer peripheral surface of the label-absorbing drum 25 and the arc-shaped guide groove 46 form a tight surface fit. The turning block 45 faces the inlet end of the separating plate 42 and forms a gap of a preset width with the separating head 43 of the separating plate 42 along the aluminum foil conveying direction. The width of this gap is adapted to the thickness of the release paper layer of the aluminum foil and the large-angle turning requirement, so that the release paper layer of the aluminum foil can pass through and complete the turning. The adhesive layer of the aluminum foil is continuously conveyed, enters the arc-shaped guide groove 46 through the inlet end of the turning block 45, and bends along the arc contour of the guide groove to form an arc that is completely consistent with the curvature of the outer peripheral surface of the label-absorbing drum 25, ensuring that the adhesive layer and the peripheral wall of the label-absorbing drum 25 achieve a complete and tight fit.

[0089] It should be noted that the radius of curvature of the arc-shaped guide groove 46 is precisely matched with the outer circumference of the suction drum 25. Since the aluminum foil adhesive layer is thin and prone to wrinkling, if the suction drum 25 is used directly for adsorption, insufficient contact between the aluminum foil adhesive layer and the peripheral wall of the suction drum 25 can easily lead to adsorption failure. Therefore, this embodiment uses an arc-shaped guide groove 46 on the turning block 45 to pre-form the adhesive layer using its arc-shaped contour, ensuring that the adhesive layer conforms to the outer circumference curvature of the suction drum 25 before entering the adsorption station. Simultaneously, the tight fit between the arc-shaped guide groove 46 and the outer circumference of the suction drum 25 effectively limits the displacement and wrinkling deformation of the adhesive layer during adsorption, ensuring that the suction holes on the peripheral wall of the suction drum 25 act uniformly on the surface of the adhesive layer, thereby forming a stable negative pressure adsorption environment. Structurally, this avoids adsorption detachment or positional shift caused by uneven contact, ensuring the accuracy of subsequent adsorption processes.

[0090] The traction component includes a rotatable active traction roller 47 mounted on the loading platform 29, a driven traction roller 48 arranged opposite to the active traction roller 47, and a main traction roller drive motor (not shown in the figure) connected to the active traction roller 47. The roller surfaces of the active traction roller 47 and the driven traction roller 48 are parallel, forming a traction channel through which the aluminum foil release paper layer passes. The spacing of the traction channel is adapted to the thickness of the release paper layer to clamp the release paper layer with a preset pressure. When the release paper layer passes through the traction channel, the roller surfaces of the active traction roller 47 and the driven traction roller 48 respectively adhere to the two side surfaces of the release paper layer to form a clamping engagement. When the main traction roller drive motor is started, it drives the active traction roller 47 to rotate around its own axis along the preset traction direction. Through the friction between the active traction roller 47 and the release paper layer, the release paper layer is directionally conveyed along the traction channel. At the same time, the driven traction roller 48 passively rotates with the movement of the release paper layer to reduce the frictional resistance during the traction process.

[0091] The die-cutting unit includes a die-cutting platform 49 fixed to one side of the electric conveyor line 1, a second limiting wheel set arranged on the die-cutting platform 49 for radial positioning of the bottom shell, and a die-cutting head assembly that can move vertically and horizontally. After the aluminum foil is attached, the bottom shell is pushed to the preset die-cutting position on the die-cutting platform 49 by the push arm. The second limiting wheel set achieves radial clamping and limiting to restrict the horizontal movement and posture deviation of the bottom shell during the die-cutting process, providing a stable reference for the die-cutting process. The die-cutting head assembly descends vertically and extends into the inner cavity of the bottom shell. After the die-cutting head assembly is aligned with the preset die-cutting area on the inner wall of the bottom shell, the die-cutting head assembly moves horizontally to cut the aluminum foil on the inner wall of the bottom shell to form aluminum foil segments of preset specifications.

[0092] It should be noted that the number of cuts of the die-cutting head assembly corresponds to the number of preset aluminum foil segments. After each cut is completed, the second limit wheel group drives the bottom shell to rotate around its own central axis to a preset angle to achieve die-cutting of multiple aluminum foil segments. The second limit wheel group has the same structure as the first limit wheel group of the attaching unit, and the die-cutting platform 49 has the same structure as the attaching platform 16 of the attaching unit. By reusing the same structural design, the overall structure of the equipment can be simplified and the manufacturing cost can be reduced.

[0093] To ensure precise control of the bottom shell rotation angle, the output end of the drive motor 18 of the second limit wheel set is equipped with an angle sensor, which is used to detect the rotation angle of the motor output end in real time and feed it back to the control system set on the aluminum foil attaching machine in this embodiment to form a closed-loop control. For example, when it is necessary to cut the aluminum foil on the inner wall of the bottom shell into four equal segments, four cutting operations need to be completed accordingly. After each cutting is completed, the output end of the drive motor 18 drives the drive wheel 17 to rotate 90° under the precise feedback of the angle sensor, so that the drive wheel 17 drives the bottom shell to rotate 90° accordingly, so as to ensure the consistency of the spacing and dimensional accuracy of each aluminum foil segment and meet the requirement of sealing the exhaust hole of the gas generator bottom shell.

[0094] The die-cutting head assembly includes a vertically movable lifting frame 50, a lifting cylinder 51 that drives the lifting frame 50 to move up and down, a cutting blade 52 movably mounted on the lifting frame 50, and a cutting blade drive motor 53 that is connected to the cutting blade 52 in a transmission manner. When the lifting frame 50 moves downward, it drives the cutting blade 52 to move downward and extend into the inner cavity of the bottom shell. The cutting blade drive motor 53 starts and drives the cutting blade 52 to make radial feed motion toward the inner peripheral wall of the pad 33 to cut aluminum foil.

[0095] The lifting frame 50 includes a vertical plate, linear guide rails fixed on the vertical plate, and a movable seat mounted on the slider of the linear guide rails. The vertical plate is a rectangular plate structure, vertically fixed to the die-cutting platform 49 by a bracket, providing a rigid support reference for the entire lifting frame 50. There are two linear guide rails, which are arranged vertically and symmetrically distributed on the surface of the vertical plate to ensure guiding accuracy and force balance. The movable seat is an L-shaped seat structure, and the vertical section of the movable seat is fixedly connected to the slider of the two linear guide rails to realize synchronous linkage between the movable seat and the linear guide rails, ensuring the directional movement accuracy of the movable seat in the vertical direction. The lifting cylinder 51 is fixedly mounted on the vertical plate, and the piston rod of the lifting cylinder 51 extends in the vertical direction and is perpendicularly fixed to the horizontal section of the movable seat to drive the movable seat to rise and fall along the linear guide rails.

[0096] The cutting blade 52 is movably mounted on the movable base via the movable base 54, and the cutting direction of the cutting blade 52 is parallel to the radial direction of the bottom shell. The movable base 54 includes a blade mounting end for clamping the cutting blade 52, a transmission end for transmitting power, and a guide part 55 located between the blade mounting end and the transmission end. The blade mounting end of the movable base 54 is provided with a blade mounting rod 66, on which the cutting blade 52 is detachably clamped and fixed by bolts. The transmission end of the movable base 54 is connected to the output end of the cutting blade drive motor 53 via a transmission assembly. When the cutting blade drive motor 53 starts... When in motion, power is transmitted to the movable seat 54 via the transmission assembly, driving the movable seat 54 to move and causing the cutting blade 52 to feed radially within the bottom shell, completing the aluminum foil cutting. A guide rod 56 extending along the cutting direction is fixed on the movable seat, and the guide part 55 of the movable frame forms a sliding fit with the guide rod 56 to constrain the movement trajectory of the movable seat 54 and ensure the accuracy of the feed direction of the cutting blade 52. A reset component is sleeved on the guide rod 56 to drive the movable seat 54 and the cutting blade 52 to reset to the initial position after the cutting process is completed, preparing for the next cutting action.

[0097] The transmission assembly includes an eccentric wheel 38 fixed to the output end of the cutting blade drive motor 53 and a force-receiving wheel 39 rotatably mounted on the transmission end of the moving seat 54. The wheel surfaces of the eccentric wheel 38 and the force-receiving wheel 39 are in rolling tangential engagement to form a cam transmission structure, which is used to convert the rotational torque output by the cutting blade drive motor 53 into a linear driving force of the moving seat 54 along the cutting direction, and to realize the periodic reciprocating movement of the moving seat 54. The eccentricity of the eccentric wheel 38 is adapted to the preset cutting stroke.

[0098] The guide part 55 of the movable seat 54 is integrally formed on one side of the movable seat 54. The guide part 55 has a guide rod hole that is clearance-fitted with the guide rod 56. The inner wall of the guide rod hole is a smooth wall surface to reduce sliding friction with the guide rod 40. The two ends of the guide rod 56 are fixed to the movable seat by support blocks to form a cantilever support structure with fixed ends, ensuring the straightness and installation stability of the guide rod 56. The reset component is a reset spring 41. The reset spring 41 is sleeved on the guide rod 56 in a pre-compressed state. One end of the reset spring 41 abuts against the end face of the guide part 55 of the tool holder 36, and the other end abuts against the end face of the support block on the movable seat. The automatic reset of the movable seat 54 is achieved by the spring force.

[0099] The clamping unit includes a first support platform 57 fixed to one side of the electric transmission line 1, and a clamping assembly mounted on the first support platform 57 that can be vertically lifted and lowered. After the aluminum foil is attached, the bottom shell is pushed to the preset clamping position of the first support platform 57 by the push arm. The clamping assembly moves vertically downward and extends into the inner cavity of the bottom shell. When it touches the bottom wall of the bottom shell, it expands radially and applies uniform radial pressure to the aluminum foil on the inner peripheral wall of the bottom shell, so as to achieve tight adhesion and clamping between the aluminum foil and the inner wall of the bottom shell, and avoid the aluminum foil from forming bubbles, wrinkles or falling off.

[0100] The pressing assembly includes a fixed frame 11 fixed to the first support platform 57, a movable plate 12 slidably mounted on the fixed frame 11, a pressing cylinder 58 drivenly connected to the movable plate 12, and an air drum 61 coaxially fixed to the bottom surface of the movable plate 12. The fixed frame 11 is provided with a vertically extending column 60, which forms a sliding fit with the guide hole on the movable plate 12 to guide the movable plate 12 to move vertically and ensure the vertical movement accuracy of the movable plate 12 and the air drum 61. When the piston rod of the pressing cylinder 58 extends downward, it drives the movable plate 12 to slide smoothly downward along the column 60, which drives the air drum 61 to move down synchronously and extend into the inner cavity of the bottom shell. After the bottom end of the air drum 61 abuts against the bottom wall of the bottom shell to form axial positioning, the air drum 61 expands radially and uniformly, and the circumferential pressure generated by the expansion presses the aluminum foil against the inner circumferential wall of the bottom shell.

[0101] Two second positioning blocks 59 are also fixed on the first support platform 57. The two second positioning blocks 59 are arranged opposite each other on both sides of the preset pressing position. The opposite sides of the two second positioning blocks 59 are symmetrically inclined guide surfaces, which together form a V-shaped positioning groove. The wide end of the V-shaped positioning groove is connected to the feeding direction of the electric conveyor line 1, so that the push arm can smoothly push the bottom shell into the V-shaped positioning groove and accurately center and position the bottom shell at the preset pressing position. The narrow end of the V-shaped positioning groove is set away from the electric conveyor line 1, and its groove width is adapted to the pushing stroke of the push arm, so that the push arm can extend into the groove and smoothly push out the bottom shell after pressing.

[0102] The air drum 61 is made of elastic and wear-resistant materials, such as silicone or polyurethane, and has a hollow circular elastic drum structure with a sealed air cavity inside. The top of the air drum 61 has a vent hole that communicates with the air cavity, and the vent hole is coaxially fixed to the connecting roller of the hollow structure, realizing the integrated design of air passage and structure. The top of the connecting roller is closed, and the inner cavity of the connecting roller communicates with the sealed air cavity of the air drum 61. The top of the connecting roller is coaxially fixed to the piston rod of the pressing cylinder 58. The peripheral wall of the connecting roller near the bottom has an air guide hole that communicates with its inner cavity.

[0103] When the pressing cylinder 58 drives the connecting roller and the air drum 61 to move downwards, and the bottom end of the air drum 61 abuts against the bottom wall of the bottom shell, the air drum 61 is compressed and deformed by axial pressure, and at the same time expands uniformly in the radial direction, so that the outer circumference of the air drum 61 is tightly attached to the aluminum foil on the inner circumference of the bottom shell. During this process, the gas in the sealed air chamber of the air drum 61 is squeezed and discharged into the inner cavity of the connecting roller through the vent hole, and then discharged to the outside through the air guide hole on the circumference of the connecting roller, so as to avoid gas retention affecting the expansion and pressing effect. After the aluminum foil is pressed, the piston rod of the pressing cylinder 58 retracts upwards, driving the connecting roller and the air drum 61 to move upwards synchronously. The air drum 61 is freed from the axial constraint of the bottom wall of the bottom shell and returns to its initial shape under the action of its own elastic force. At the same time, it draws in external gas through the vent hole, the inner cavity of the connecting roller and the air guide hole.

[0104] The leak detection unit includes a second support platform 62 fixed on one side of the electric transmission line 1, and an inflation component that can be vertically lifted and installed above the second support platform 62. After the aluminum foil is attached, the bottom shell is pushed to the preset leak detection position of the second support platform 62 by the push arm. The inflation component closes the top opening of the bottom shell and inflates the bottom shell to detect leaks.

[0105] The inflation assembly includes a fixed frame 11 fixed to the second support platform 62, a movable plate 12 slidably mounted on the fixed frame 11, a pressing cylinder 67 drivenly connected to the movable plate 12, and an inflation head 63 coaxially fixed to the bottom surface of the movable plate 12. The fixed frame 11 is provided with a vertically extending column 60, which forms a sliding fit with the guide hole on the movable plate 12 to guide the movable plate 12 to move vertically and ensure the vertical movement accuracy of the movable plate 12 and the inflation head 63. When the piston rod of the pressing cylinder 67 extends downward, it drives the movable plate 12 to slide smoothly downward along the column 60, and drives the inflation head 63 to simultaneously close the top opening of the bottom shell. The inflation head 63 is connected to an external air supply pump through a pipe to inflate the bottom shell to complete the leak test.

[0106] In this embodiment, the fixed frame 11 and movable plate 12 in the pressing component, clamping component, and inflation component have the same structure.

[0107] Two third positioning blocks 64 are also fixed on the second support platform 62. The two third positioning blocks 64 are arranged opposite each other on both sides of the preset leak detection position. The opposite sides of the two third positioning blocks 64 are symmetrically inclined guide surfaces, which together form a V-shaped positioning groove. The wide end of the V-shaped positioning groove is connected to the feeding direction of the electric conveyor line 1, so that the push arm can smoothly push the bottom shell into the V-shaped positioning groove and accurately center and position the bottom shell at the preset pressing position. The narrow end of the V-shaped positioning groove is set away from the electric conveyor line 1, and the width of the groove is adapted to the pushing stroke of the push arm, so that the push arm can extend into the groove and smoothly push out the bottom shell after pressing.

[0108] The controller configured in this embodiment of the aluminum foil attaching machine is a servo controller, which is used to control the hole inspection unit, attaching unit, die-cutting unit, pressing unit and leak detection unit to perform the corresponding processes.

[0109] The servo controller controls the rotation speed of the two electric reels by using tension sensors on the two reels to provide feedback on the tension. This ensures that the unwinding speed matches the aluminum foil conveying speed, while the winding speed is slightly greater than the unwinding speed, maintaining the preset tension of the aluminum foil to prevent stretching or slack.

[0110] The servo controller controls the rotation speed of the cutting blade drive motor 53 by using the rotation amount (i.e., the amount of aluminum foil unwinding) fed back by the position sensor on the first electric reel 30, so that the spacing between the cuts is consistent with the circumference of the inner wall of the bottom shell. When the aluminum foil is peeled off by the separation component, the servo controller fine-tunes the winding speed of the second electric reel 31 to ensure stable winding tension of the release paper layer. At the same time, it cooperates with the adsorption action of the attachment head assembly to realize the material picking of the attachment layer.

[0111] The servo controller controls the pallet drive motor 10 to drive the bottom shell to rotate at a preset uniform speed, while triggering the photoelectric probe 8 to emit an infrared beam. If the exhaust port is detected to be missing, offset, or redundant, the servo controller records the position of the bottom shell. When the bottom shell is conveyed to the first waste station, the unloading cylinder 5 is triggered to push the defective products to the collection box 4. If the product passes the inspection, the push-out arm cylinder is controlled to send the bottom shell back to the electric conveyor line 1.

[0112] The pushing component pushes the qualified base shell into the bonding station. The servo controller controls the driven wheel drive cylinder 20 of the first limit wheel group to move. The driving wheel 17 and the two driven wheels 19 form a three-point centering clamp, and the first axial limit component achieves axial positioning. The servo controller controls the driving wheel drive motor 18 to drive the base shell to rotate at a preset speed. At the same time, it controls the label suction drum drive motor 26 of the bonding head assembly. The label suction drum 25 rotates to absorb a single aluminum foil sheet and moves it into the inner cavity of the base shell. The servo controller coordinates the rotation speed of the base shell and cuts off the negative pressure path. The aluminum foil adheres to the inner wall of the base shell under its own tension. The base shell continues to rotate under the drive of the driving wheel 17 to ensure that the aluminum foil is fully bonded without wrinkles. After bonding is completed, the control arm cylinder moves to send the base shell back to the electric conveyor line 1.

[0113] The servo controller controls the cutting blade drive motor 53 to move, and the cutting blade 52 feeds radially to complete the first section of aluminum foil cutting. After the cutting is completed, the angle sensor feeds back the rotation angle of the output end of the drive wheel motor 18 to the servo controller. The controller drives the drive wheel motor 18 to rotate by a preset angle (such as 90° when cutting into four sections) to achieve secondary cutting.

[0114] After the bottom shell is centered by the V-shaped positioning groove, the servo controller controls the action of the clamping cylinder 58. The air drum 61 descends and extends into the inner cavity of the bottom shell and abuts against the bottom wall. The air drum 61 expands radially to clamp the aluminum foil. After clamping is completed, the air drum 61 elastically resets, and the push-out arm sends the bottom shell back to the conveyor line.

[0115] The servo controller controls the action of the pressing cylinder 58 of the inflation component, the inflation head 63 closes the top opening of the bottom shell, the servo controller controls the air supply pump to inflate the bottom shell and detects the air pressure change. If the air pressure drops, it is judged as leaking and unqualified. When the bottom shell is conveyed to the second waste disposal station, the unloading cylinder 5 is triggered to discharge waste. If the detection is qualified, it is sent back to the conveyor line and finally discharged from the unloading end.

[0116] This invention uses a first and a second limiting wheel set to limit the bottom shell during the application and die-cutting processes, respectively. By employing a method of applying first and then cutting in segments, the accuracy of the aluminum foil's repeated positioning on the inner circumference of the bottom shell is greatly improved, achieving a high degree of consistency in the aluminum foil application position during mass production. An adsorption transfer method is used to transfer the aluminum foil from material picking to application, avoiding the problems of aluminum foil breakage and wrinkling that easily occur in traditional manual operations, ensuring the integrity and flatness of the aluminum foil during the application process. Simultaneously, the die-cutting head assembly extends into the bottom shell to perform segmented die-cutting of the already applied aluminum foil, avoiding problems such as aluminum foil size deviation and loose adhesion caused by die-cutting before application. The entire application process eliminates the need for tedious manual steps such as aluminum foil cutting, positioning, and individual application, significantly reducing manual intervention and thus improving the quality and efficiency of aluminum foil application to the bottom shell.

[0117] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention. The implementation of the present invention is not limited thereto. All other modifications, substitutions or alterations made to the above structure of the present invention based on the above content of the present invention, in accordance with ordinary technical knowledge and common practice in the field, without departing from the basic technical idea of ​​the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A machine for attaching aluminum foil to the inner peripheral wall of a gas generator bottom shell, characterized in that, The device includes a feeding mechanism for forming a feeding path, and an attaching unit and a die-cutting unit arranged sequentially along the feeding path. The attaching unit includes a first limiting wheel assembly that can limit the bottom shell to a preset attaching position, a feeding assembly that conveys aluminum foil to a preset picking position, and an attaching head assembly that can absorb aluminum foil from the preset picking position, move to the preset attaching position, and extend into the bottom shell to attach aluminum foil to the inner peripheral wall of the bottom shell. The die-cutting unit includes a second limiting wheel assembly that can limit the bottom shell to a preset die-cutting position, and a die-cutting head assembly that is located at the preset die-cutting position and can move into the bottom shell to die-cut the aluminum foil attached to the inner peripheral wall of the bottom shell in segments.

2. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 1, characterized in that, The first limiting wheel group and the second limiting wheel group have the same structure, both including a driving wheel, a driving wheel drive motor that drives the driving wheel to rotate around the axis, two driven wheels that are arranged opposite to the driving wheel and are movable, and a driven wheel drive component that can drive the two driven wheels to move synchronously. When the driven wheel drive unit drives the driven wheel to approach the driving wheel, the wheel surfaces of the driving wheel and the two driven wheels respectively form a three-point line contact with the outer peripheral surface of the bottom shell, so as to limit the radial position of the bottom shell to the preset attachment position. When the drive motor drives the drive wheel to rotate, it causes the bottom shell, which is radially limited, to rotate, and the two driven wheels rotate synchronously with the bottom shell.

3. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 2, characterized in that, The feeding assembly includes an unwinding component, a cutting component, a separating component, a traction component, and a winding component arranged sequentially along the feeding path; When the unwinding component releases the aluminum foil, the slicing component forms a slit on the adhesive layer of the aluminum foil, and the adhesive layer and release paper layer of the aluminum foil are separated when it passes through the separating component. The separated adhesive layer is adsorbed by the adhesive head assembly at the preset material pick-up position, and the release paper layer is pulled to the winding component by the traction component to complete the winding.

4. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 3, characterized in that, The attachment head assembly includes a movable frame, a rotatable label-absorbing drum mounted on the movable frame, and a label-absorbing drum drive motor connected to the label-absorbing drum. A negative pressure chamber is formed inside the label-absorbing drum, and air suction holes are opened on the peripheral wall of the label-absorbing drum. The top of the label-absorbing drum is connected to an external negative pressure component through an air guiding structure. When the movable frame moves the label-collecting drum to the preset material-collecting position, the aluminum foil adhesive layer is adsorbed and adhered to the outer peripheral wall of the label-collecting drum by the adsorption force at the air suction hole.

5. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 4, characterized in that, The cutting component includes a pad with a cushion portion, a cutting blade with a blade tip disposed opposite to the pad portion and movable, and a cutting blade drive motor that drives the cutting blade; a cutting channel is formed between the blade tip and the pad portion that is collinear with the feeding path; When the aluminum foil passes through the cutting channel along the preset feeding path, the cutting knife drive motor drives the cutting knife to feed towards the pad. Through the shearing action between the knife tip and the pad, a cut is formed on the adhesive layer of the aluminum foil.

6. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 5, characterized in that, The separating component is a separating plate with one end corresponding to the outlet end of the cutting channel of the cutting component, and the other end of the separating plate extends along the feeding path to the preset material picking position and forms an acute-angled separating head. When the aluminum foil after cutting is conveyed to the separating head along the guide surface of the separating plate, the release paper layer turns along the sharp corner of the separating head and is pulled to the winding component by the traction component to complete the winding; the adhesive layer peels off as the release paper turns, breaks along the cut to form an independent aluminum foil sheet, and is conveyed to the preset material picking position to be attracted by the label drum.

7. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 6, characterized in that, The die-cutting head assembly includes a liftable lifting frame, a lifting cylinder for driving the lifting frame to move up and down, a cutting blade movably mounted on the lifting frame, and a cutting blade drive motor that is connected to the cutting blade for transmission. When the lifting frame moves downward, it drives the cutting blade to move down and extend into the inner cavity of the bottom shell. When the cutting blade drive motor is started, it drives the cutting blade to feed radially toward the inner peripheral wall of the pad to complete the aluminum foil cutting.

8. The aluminum foil attaching machine for the inner peripheral wall of the bottom shell of a gas generator according to any one of claims 1-7, characterized in that, It also includes a hole inspection unit located in the feeding path and at the entry end of the attachment unit; the hole inspection unit includes a hole inspection platform located on one side of the feeding mechanism, a support member rotatably mounted on the hole inspection platform, a photoelectric probe located on the periphery of the support member, and a pressing member that can be raised and lowered above the support member. When the bottom shell to be coated with aluminum foil is sent to the inspection platform, it is supported by the support component, and the pressing component moves down to press against the bottom shell; the support component rotates around its own axis and drives the bottom shell to rotate synchronously, and the photoelectric probe performs a circumferential scan of the bottom shell's exhaust holes to complete the compliance inspection of the exhaust holes.

9. The aluminum foil attaching machine for the inner peripheral wall of the bottom shell of a gas generator according to any one of claims 1-7, characterized in that, It also includes a pressing unit set in the feeding path and located at the exit end of the die-cutting unit; the pressing unit includes a first support platform fixed to one side of the feeding mechanism, and a pressing component that can be vertically lifted and mounted on the platform; the bottom shell after the aluminum foil is attached is sent to the preset pressing position of the first support platform, the pressing component moves vertically downward and extends into the inner cavity of the bottom shell, and expands radially after contacting the bottom wall of the bottom shell to press the aluminum foil on the inner peripheral wall of the bottom shell.

10. The aluminum foil attaching machine for the inner peripheral wall of the gas generator bottom shell according to claim 9, characterized in that, It also includes a leak detection unit located in the feeding path and at the exit end of the pressing unit; the leak detection unit includes a second support platform fixed to one side of the feeding mechanism, and an inflation component that can be vertically lifted and lowered and mounted above the second support platform; the bottom shell after being attached with aluminum foil is sent to the preset leak detection position of the second support platform, the inflation component closes the top shell opening of the bottom shell, and inflates the bottom shell to detect leaks.

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