A liquid storage tank assembly line

Abstract

The application discloses a liquid storage tank assembly line, which comprises a pre-inspection mechanism, a helium inspection device, a post-inspection mechanism and an up-down tray backflow mechanism, wherein the pre-inspection mechanism, the helium inspection device and the post-inspection mechanism are arranged in a left-middle-right structure respectively, and the up-down tray backflow mechanism is arranged at the front end of the pre-inspection mechanism and the up-down tray backflow mechanism respectively. The scheme effectively solves the pain points of traditional assembly lines through automatic tray backflow, integrated continuous production, intelligent quality control and flexible design, realizes cost reduction and benefit increase, quality control and production line upgrading, and provides a reliable solution for efficient and intelligent assembly of liquid storage tanks.

Description

Technical Field

[0001] This invention relates to the field of liquid storage tank assembly technology, specifically to a liquid storage tank assembly line. Background Technology

[0002] Liquid storage tank assembly lines typically consist of multiple independent workstations arranged sequentially along a conveyor line. These workstations perform processes such as marking, expansion, pressing, welding, inspection, and accessory installation of the liquid storage tanks. Workpieces are usually carried on pallets and move along the conveyor line. Some lines can achieve pallet recycling by setting up lifting mechanisms at the ends. Some workstations are equipped with industrial cameras for workpiece positioning or appearance inspection, some are equipped with barcode scanners for workpiece information collection and traceability, and some lines also integrate helium detectors to test the sealing performance of the liquid storage tanks.

[0003] Existing liquid storage tank assembly is mostly done at independent workstations, requiring frequent manual handling of products, resulting in low turnover efficiency and high labor intensity; there is no unified integrated line, equipment is scattered, and space utilization is low; moreover, empty pallets need to be handled manually, affecting the cycle time and increasing labor costs.

[0004] Therefore, a solution is needed. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a liquid storage tank assembly line to solve the problems mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A liquid storage tank assembly line includes a pre-inspection mechanism, a helium detection device, a post-inspection mechanism, and an upper and lower tray return mechanism. The pre-inspection mechanism, the helium detection device, and the post-inspection mechanism are respectively arranged in a left-middle-right structure. The upper and lower tray return mechanisms are respectively located inside the pre-inspection mechanism and at the front end of the upper and lower tray return mechanism. The pre-inspection mechanism includes a top cover marking box, a laser marking device, a top cover and pipe expansion joint box, a pipe storage tank, a sealing ring installer, a filter screen pressing box, a filter screen pressing fixture, a camera bracket, an industrial camera, a dryer bag fixing box, a dryer bag binding fixture, a dryer bag storage constant temperature and humidity chamber, a second camera bracket, a second industrial camera, a welding box, a cylinder laser welding device, a barcode scanning device, and a control device. The laser marking device is located inside the top cover marking box. The top cover and pipe expansion joint box is located at the right end of the top cover marking box. The pipe storage tank and sealing ring installer are located inside the top cover and pipe expansion joint box. The filter screen pressing box is located at the right end of the top cover and pipe expansion joint box. The filter screen pressing fixture is located inside the filter screen pressing box. Camera bracket one is located at the right end of the filter press box, industrial camera one is located at the left end of camera bracket one, dryer bag fixing box is located at the right end of filter press box, dryer bag binding fixture is located inside dryer bag fixing box, dryer bag storage constant temperature and humidity box is located at the left end of dryer bag binding fixture, camera bracket two is located at the right end of dryer bag fixing box, industrial camera two is located at the left end of camera bracket two, welding box is located at the right end of dryer bag fixing box, cylinder laser welding device is located inside welding box, barcode scanning device one is located at the right end of cylinder laser welding device, and control device one is located at the front end of the upper half of barcode scanning device one.

[0007] Preferably, the laser marking device is located in the rear half of the upper cover marking box.

[0008] Preferably, the pipe storage tank and the sealing ring installer are both located in the rear half of the upper cover and the pipe expansion joint box, with the sealing ring installer and the pipe storage tank distributed on the left and right sides respectively.

[0009] Preferably, the filter pressing fixture is located in the rear half of the filter pressing box, the drying package binding fixture and the drying package storage constant temperature and humidity chamber are both located in the rear half of the drying package fixing box, and the cylinder laser welding device and the barcode scanning device are both located in the rear half of the welding box.

[0010] Preferably, the barcode scanning device is signal-connected to the control device, and the control device is control-connected to the cylinder laser welding device.

[0011] Preferably, the post-inspection mechanism includes a bracket mounting box, a bracket mounting device, an oil filling reserved station, a nitrogen filling reserved station, a sealing plug assembly box, a plug assembly device, a second barcode scanning device, and a second control device. The bracket mounting box is located at the right end of the helium detection equipment, the bracket mounting device is located inside the bracket mounting box, the oil filling reserved station and the nitrogen filling reserved station are respectively located on the left and right sides of the right end of the bracket mounting box, the sealing plug assembly box is located at the right end of the nitrogen filling reserved station, the plug assembly device is located inside the sealing plug assembly box, the second barcode scanning device is located at the right end of the plug assembly device, and the second control device is located at the left end of the plug assembly device.

[0012] Preferably, the second scanning device is signal-connected to the second control device, and the second control device is control-connected to the plug assembly device.

[0013] Preferably, the upper and lower pallet return mechanism includes an upper conveying device, a baffle, a lower conveying device, a connecting plate, a pallet, a return box, a lifting groove, a lifting plate, a screw slide mechanism, a slider, a receiving plate, a first groove, a second groove, a multi-stage cylinder, a push bar, a through groove, and a base. The baffle is located at the top of the front and rear ends of the upper conveying device, the lower conveying device is located below the upper conveying device, the connecting plate is equidistantly located at the front and rear ends between the upper conveying device and the baffle, the pallet is located on the upper conveying device, the return boxes are opposite to each other at the left and right ends of the upper and lower conveying devices, the lifting groove is located inside each return box, the lifting plate is located inside each lifting groove, the screw slide mechanism is located inside and on top of each lifting plate, and the slider is located... The receiving plate is located inside each of the lifting plates, and the receiving plate is located outside each of the sliders and inside the lifting groove. The first groove is arranged opposite to each other at the inner end of each receiving plate. The second groove is arranged opposite to each other on the outer wall of each return box. The multi-stage cylinder is arranged outside each second groove and connected to the return box. The push bar is arranged at the output end of each multi-stage cylinder and extends inward toward the adjacent second groove. The through grooves are respectively arranged in the front half of the interior of the upper cover marking box, the upper cover and pipe expansion box, the filter screen pressing box, the drying package fixing box and the welding box. The base is arranged at the bottom of the left return box in the upper and lower tray return mechanism on the left and at the bottom of the two return boxes in the upper and lower tray return mechanism on the right.

[0014] Preferably, the baffle is rectangular in shape, the height of the baffle is higher than the height of the tray, and the tray is integrally formed with the front and rear ends of the upper conveying device. The lower conveying device and the connecting plate are integrally formed with the upper conveying device. The height of the through groove is equal to the sum of the heights of the upper conveying device, the baffle, the lower conveying device, and the connecting plate. The right end of the return box in the lower tray return mechanism on the left is located at the right end of the through groove in the welding box and does not exceed the right end of the welding box. The left end of the lower tray return mechanism on the left extends beyond the left end of the upper cover marking box. The lower tray return mechanism on the right is located at the front end of the bracket mounting box and the sealing plug assembly box and stands on the ground. The height of the second groove on the left in each lower tray return mechanism is higher than the height of the second groove on the right.

[0015] Preferably, the slider and the receiving plate are integrally formed, the push bar has a right-angled trapezoidal structure with the inclined surface of the trapezoid facing upwards, and the length of the push bar is equal to the sum of the depth of the second groove and the depth of the first groove.

[0016] (III) Beneficial Effects This invention provides a liquid storage tank assembly line. It has the following beneficial effects: 1. By using fully automated pallet recycling, manual handling is eliminated, reducing labor intensity and labor costs, and ensuring continuous production line cycle time.

[0017] 2. An integrated production line layout is adopted to integrate all assembly processes, thereby improving workshop space utilization and material flow efficiency.

[0018] 3. Construct a continuous closed-loop production line with close connections between workstations, which greatly improves the overall assembly efficiency of liquid storage tanks.

[0019] 4. By relying on visual inspection and MES information traceability, we strictly control assembly quality and process efficiency, effectively improving the product qualification rate.

[0020] 5. The flexible design of reserved workstations, combined with an adjustable recirculation mechanism, enhances the versatility of the production line and adapts to diverse production scenarios.

[0021] 6. Automated workpiece flow reduces manual intervention, lowers human error, and improves product assembly accuracy and consistency.

[0022] 7. Integrated helium testing equipment enables integrated testing of sealing performance, ensuring the sealing quality of liquid storage tanks and optimizing the production and testing process. Attached Figure Description

[0023] Figure 1 This is a front view of the assembly line of the present invention after the upper and lower pallet return mechanism on the right side has been removed; Figure 2This is a top view of the assembly line of the present invention, ignoring the oil filling and nitrogen filling reserved positions. Figure 3 This is a schematic diagram of the upper and lower tray return mechanism located inside the pre-inspection mechanism of the present invention; Figure 4 This is a schematic diagram of the reflux box of the present invention; Figure 5 This is a schematic diagram of the slider, receiving plate, multi-stage cylinder and push bar of the present invention; Figure 6 This is a schematic diagram of the upper and lower tray return mechanism located at the front end of the inspection mechanism of the present invention; Figure 7 This is a schematic diagram illustrating the structure of the through-slot of the present invention.

[0024] In the diagram: 1-Pre-inspection mechanism; 11-Upper cover marking box; 12-Laser marking device; 13-Upper cover and pipe expansion joint box; 14-Pipe storage tank; 15-Sealing ring installer; 16-Filter screen pressing box; 17-Filter screen pressing fixture; 18-Camera bracket one; 19-Industrial camera one; 110-Drying package fixing box; 111-Drying package binding fixture; 112-Drying package storage constant temperature and humidity chamber; 113-Camera bracket two; 114-Industrial camera two; 115-Welding box; 116-Cylinder laser welding device; 117-Scanning device one; 118-Control device one; 2-Helium detection equipment; 3-Post-inspection mechanism; 31-Bracket 32- Mounting box; 33- Oil filling reserved station; 34- Nitrogen filling reserved station; 35- Sealing plug assembly box; 36- Plug assembly device; 37- Scanning device II; 38- Control device II; 4- Upper and lower pallet return mechanism; 41- Upper conveying device; 42- Baffle; 43- Lower conveying device; 44- Connecting plate; 45- Pallet; 46- Return box; 47- Lifting groove; 48- Lifting plate; 49- Screw slide mechanism; 410- Slider; 411- Receiving plate; 412- Groove I; 413- Groove II; 414- Multi-stage cylinder; 415- Push bar; 416- Through groove; 417- Base. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-7The present invention provides a technical solution to achieve this: including a pre-inspection mechanism 1, a helium detection device 2, a post-inspection mechanism 3, and an upper and lower tray return mechanism 4. The pre-inspection mechanism 1, the helium detection device 2, and the post-inspection mechanism 3 are respectively arranged in a left-middle-right structure. The upper and lower tray return mechanism 4 is respectively arranged inside the pre-inspection mechanism 1 and at the front end of the upper and lower tray return mechanism 4.

[0027] The pre-inspection mechanism 1 includes a top cover marking box 11, a laser marking device 12, a top cover and pipe expansion joint box 13, a pipe storage tank 14, a sealing ring installer 15, a filter screen pressing box 16, a filter screen pressing fixture 17, a camera bracket 18, an industrial camera 19, a drying package fixing box 110, a drying package binding fixture 111, a drying package storage constant temperature and humidity chamber 112, a second camera bracket 113, a second industrial camera 114, a welding box 115, a cylinder laser welding device 116, a barcode scanning device 117, and a control device 118. The laser marking device 12 is located inside the top cover marking box 11. The top cover and pipe expansion joint box 13 is located at the right end of the top cover marking box 11. The pipe storage tank 14 and the sealing ring installer 15 are located inside the top cover and pipe expansion joint box 13. The filter screen pressing box 16 is located at the right end of the top cover and pipe expansion joint box 13. The filter screen pressing fixture 17 is located at the right end of the top cover and pipe expansion joint box 13. Inside the filter press box 16, camera bracket 18 is located at the right end of the filter press box 16, industrial camera 19 is located at the left end of camera bracket 18, dryer bag fixing box 110 is located at the right end of the filter press box 16, dryer bag binding fixture 111 is located inside the dryer bag fixing box 110, dryer bag storage constant temperature and humidity chamber 112 is located at the left end of the dryer bag binding fixture 111, camera bracket 2 113 is located at the right end of the dryer bag fixing box 110, industrial camera 2 114 is located at the left end of camera bracket 2 113, welding box 115 is located at the right end of the dryer bag fixing box 110, cylinder laser welding device 116 is located inside the welding box 115, barcode scanning device 117 is located at the right end of cylinder laser welding device 116, and control device 118 is located at the front end of the upper half of barcode scanning device 117.

[0028] In detail, the laser marking device 12 is located in the rear half of the upper cover marking box 11.

[0029] The pipeline storage tank 14 and the sealing ring installer 15 are both located in the rear half of the upper cover and the pipeline expansion box 13, with the sealing ring installer 15 and the pipeline storage tank 14 distributed on the left and right respectively.

[0030] The filter press fixture 17 is located in the rear half of the filter press box 16. The drying package binding fixture 111 and the drying package storage constant temperature and humidity chamber 112 are both located in the rear half of the drying package fixing box 110. The cylinder laser welding device 116 and the barcode scanning device 117 are both located in the rear half of the welding box 115.

[0031] The barcode scanning device 117 is connected to the control device 118 via signal, and the control device 118 is connected to the cylinder laser welding device 116 via control.

[0032] The post-inspection mechanism 3 includes a bracket mounting box 31, a bracket mounting device 32, an oil filling reserved station 33, a nitrogen filling reserved station 34, a sealing plug assembly box 35, a plug assembly device 36, a barcode scanning device 2 37, and a control device 2 38. The bracket mounting box 31 is located at the right end of the helium inspection equipment 2. The bracket mounting device 32 is located inside the bracket mounting box 31. The oil filling reserved station 33 and the nitrogen filling reserved station 34 are located on the left and right sides of the right end of the bracket mounting box 31, respectively. The sealing plug assembly box 35 is located at the right end of the nitrogen filling reserved station 34. The plug assembly device 36 is located inside the sealing plug assembly box 35. The barcode scanning device 2 37 is located at the right end of the plug assembly device 36. The control device 2 38 is located at the left end of the plug assembly device 36.

[0033] The barcode scanning device 2 37 is connected to the control device 2 38 via signal, and the control device 2 38 is connected to the plug assembly device 36 via control.

[0034] The upper and lower pallet return mechanism 4 includes an upper conveying device 41, a baffle 42, a lower conveying device 43, a connecting plate 44, a pallet 45, a return box 46, a lifting groove 47, a lifting plate 48, a screw slide mechanism 49, a slider 410, a receiving plate 411, a first groove 412, a second groove 413, a multi-stage cylinder 414, a push bar 415, a through groove 416, and a base 417. The baffle 42 is located at the top of the front and rear ends of the upper conveying device 41, the lower conveying device 43 is located below the upper conveying device 41, the connecting plate 44 is equidistantly located at the front and rear ends between the upper conveying device 41 and the baffle 42, the pallet 45 is located on the upper conveying device 41, the return box 46 is located opposite to the left and right ends of the upper conveying device 41 and the lower conveying device 43, the lifting groove 47 is located inside each return box 46, the lifting plate 48 is located inside each lifting groove 47, and the screw slide mechanism 49 is located inside each lifting plate 48. The top and bottom sections are as follows: slider 410 is located inside each lifting plate 48; receiving plate 411 is located outside each slider 410 and inside the lifting groove 47; groove 1 412 is arranged opposite each other at the inner end of each receiving plate 411; groove 2 413 is arranged opposite each other on the outer wall of each return box 46; multi-stage cylinder 414 is arranged outside each groove 2 413 and connected to the return box 46; push bar 415 is arranged at the output end of each multi-stage cylinder 414 and extends inward toward the adjacent groove 2 413; through grooves 416 are respectively arranged in the front half of the interior of the upper cover marking box 11, the upper cover and pipe expansion box 13, the filter screen pressing box 16, the drying package fixing box 110, and the welding box 115; base 417 is arranged at the bottom of the left return box 46 in the upper and lower tray return mechanism 4 on the left and at the bottom of the two return boxes 46 in the upper and lower tray return mechanism 4 on the right.

[0035] The baffle 42 has a rectangular structure. The height of the baffle 42 is higher than the height of the tray 45. The tray 45 is integrally formed with the front and rear ends of the upper conveying device 41. The lower conveying device 43 and the connecting plate 44 are integrally formed with the upper conveying device 41. The height of the through groove 416 is equal to the sum of the heights of the upper conveying device 41, the baffle 42, the lower conveying device 43 and the connecting plate 44. The right end of the return box 46 in the lower tray return mechanism 4 on the left is located inside the right end of the through groove 416 in the welding box 115 and does not exceed the right end of the welding box 115. The left end of the lower tray return mechanism 4 on the left exceeds the left end of the upper cover marking box 11. The lower tray return mechanism 4 on the right is located at the front end of the bracket mounting box 31 and the sealing plug assembly box 35 and stands on the ground. The height of the left groove 413 in each lower tray return mechanism 4 is higher than the height of the right groove 413.

[0036] The slider 410 and the receiving plate 411 are integrally formed. The push bar 415 has a right-angled trapezoidal structure with the inclined surface of the trapezoid facing upward. The length of the push bar 415 is equal to the sum of the depth of the second groove 413 and the depth of the first groove 412.

[0037] Solution Analysis: 1. Achieve fully automated pallet circulation and return, completely solving the pain points of manual handling. This solution utilizes the coordinated lifting, conveying, and pushing actions of the upper and lower pallet return mechanisms to automatically return pallets from the right end of the production line to the left end, eliminating the need for manual handling of empty pallets throughout the entire process. This significantly reduces labor intensity and manual handling costs; furthermore, it ensures a constant reserve of empty pallets at the head of the line, guaranteeing continuous production and preventing production line stoppages due to untimely pallet turnover. It fundamentally solves the problems of low efficiency and reduced production capacity caused by manual handling of empty pallets in existing technologies.

[0038] II. Integrated production line layout optimizes space utilization and material flow efficiency. The assembly line adopts an integrated layout of pre-inspection mechanisms, helium testing equipment, and post-inspection mechanisms, combining all processes such as marking, expansion, pressing, welding, testing, and accessory installation into a unified line, thus overcoming the drawbacks of traditional scattered equipment placement. Workshop space utilization is significantly improved. Workpieces flow continuously in one direction along the conveyor line via pallets, eliminating the need for frequent manual handling between independent workstations. Material flow efficiency is multiplied, and the production flow is more scientific and rational.

[0039] 3. Continuous operation throughout the entire process improves overall assembly production efficiency. From marking sub-components, expanding and connecting pipes on the top cover, pressing in the filter screen, fixing the drying package, and welding the cylinder, to helium testing, bracket installation, and end cap assembly, a closed-loop continuous production line is formed with each station closely connected. Workpieces flow in an orderly manner via conveyor lines, and the assembly process is uninterrupted and free of redundant waiting. Compared with the decentralized operation mode of independent workstations, the overall production efficiency is greatly improved, making it suitable for the needs of large-scale mass production.

[0040] IV. Intelligent visual inspection + information-based traceability ensure product assembly quality. The production line is equipped with two industrial cameras for automated visual inspection, pre-checking the assembly of sealing rings, the pressing status of filter screens, and any missing parts, thus eliminating defective products in advance. Combined with a barcode scanner and MES system, it enables full-process data collection and traceability of workpiece information, while strictly controlling the 2-hour aging process requirements from the installation of the drying package to welding and plug assembly. The entire process is controllable and traceable, effectively avoiding product quality defects caused by human error or process violations, and improving the finished product pass rate.

[0041] V. Flexible design to adapt to diverse production scenarios The oil filling and nitrogen filling stations are designed to be ready for immediate use, allowing for normal production without installation. The upper and lower pallet return mechanism on the right side can adapt to different length specifications based on the assembly status of the reserved stations. The line has flexible adjustment capabilities, making it compatible with different process configurations and production scenarios with varying capacity requirements. Its versatility and flexibility are significantly superior to traditional fixed-structure assembly lines.

[0042] VI. Automated workflow reduces reliance on manual labor and minimizes human error. Workpieces are automatically transferred using pallets as carriers, with only necessary manual operations retained in key assembly processes. This reduces human intervention and minimizes issues such as workpiece collisions and misalignments caused by human handling and placement errors. Furthermore, visual inspection and MES timeliness control further mitigate quality problems caused by human negligence and improve assembly accuracy and product consistency.

[0043] VII. Integrated helium detection function ensures the core sealing performance of the liquid storage tank. The production line integrates helium testing equipment, which can directly complete the sealing performance test after the welding process, realizing the integration of assembly and sealing performance testing. There is no need for separate transfer and testing, which not only ensures that the sealing performance of the liquid storage tank products meets the standards, but also further optimizes the production process and improves testing efficiency and product reliability.

[0044] Working principle: During normal operation, the oil filling reserved station 33 and nitrogen filling reserved station 34 are in standby mode and do not need to be installed between the bracket mounting device 32 and the sealing plug assembly box 35. The upper and lower pallet return mechanism 4 located on the right can produce different lengths of upper and lower pallet return mechanism 4 depending on whether the reserved stations are installed or not. The pallet 45 on the upper and lower pallet return mechanism 4 is brought to the receiving plate 411 on the right by the upper conveyor device 41, moved down by the screw slide mechanism 49, and pushed by the pusher bar 415 to the lower conveyor device 43 by the multi-stage cylinder 414. The lower conveyor device 43 transfers the pallet 45 to the receiving plate 411 on the left, then the receiving plate 411 moves up, and finally the pusher bar 415 pushes the pallet 45 to the right onto the upper conveyor device 41. No manual handling is required, and there is always an empty pallet 45 at the head for use. The coded sub-parts are loaded by employees, and the coded products are placed in the fixed position on the pallet 45. The pallet enters the top cover and pipe expansion box 13 via the upper conveyor 41.

[0045] The top cover is removed from the tray 45 by the employee and expanded to fit the pipe. The pipe has a sealing ring installed by the sealing ring installer 15 beforehand. The expanded product is placed on the tray 45 by the employee and enters the filter press box 16 via the upper conveyor 41.

[0046] The expanded and joined products are manually removed. The filter screen is then manually loaded onto the filter screen pressing fixture 17, and the expanded and joined products are placed on the fixture 17 for manual pressing. Before pressing, an industrial camera 19 is used to take photos to confirm that the product is pressed into the top cover and to check for the presence of the sealing ring. The pressed filter screen is then manually placed onto the tray 45, and the tray is conveyed via the upper conveyor 41 into the drying package fixing box 110.

[0047] The product is removed manually. The drying package and the product are tied together manually with cable ties, and excess cable ties are trimmed. The tied product is then placed manually onto tray 45. The tied product is then photographed by industrial camera 2 114 to check for any missing parts in the assembly. Then, tray 45 enters welding box 115 via upper conveyor 41.

[0048] The assembled products are manually removed. The product is scanned, and the MES control device 118 reads the drying package installation time; welding assembly is permitted if the time interval is within 2 hours. The cylinder and product are manually assembled and placed at the cylinder laser welding device 116 for welding. The welded products are then manually placed into the helium detector 2. The tray returns to the left end via the upper and lower tray return mechanism 4. The helium-tested products are then manually placed onto tray 45 of the upper and lower tray return mechanism 4 on the right and transported to the bracket mounting box 31.

[0049] The bracket and cylinder assembly are manually picked up and assembled. Then, the employee uses a tightening gun to tighten the fastening screws. The assembled product is then manually picked up and placed on pallet 45 and transported to the sealing plug assembly box 35.

[0050] The assembled product is manually removed from the support frame. The product's QR code is scanned, and the MES control device 38 determines that the time interval between installing the desiccant pack is within 2 hours. The sealing plug and product are then manually placed onto the cap assembly device 36 for assembly. The assembled product is then manually packaged. The empty pallet returns to the left side via the upper and lower pallet return mechanism 44.

[0051] Technical effects of implementing this solution: This solution addresses the industry pain point of manual pallet handling through an automated pallet return mechanism. It optimizes spatial layout and production flow efficiency through integrated and continuous line design. Visual inspection, MES information management, and helium inspection integration ensure end-to-end quality assurance and process compliance control. Furthermore, the flexible design of reserved workstations enhances production line adaptability. The overall solution fundamentally overcomes the shortcomings of traditional assembly lines, such as high labor costs, low flow efficiency, poor space utilization, and weak quality control. Ultimately, it achieves comprehensive technical effects including increased production efficiency, reduced labor costs, controllable product quality, and upgraded production flexibility, providing an efficient and reliable solution for the large-scale, standardized, and intelligent assembly of liquid storage tanks.

[0052] Application Example 1 of this Solution In another embodiment of the present invention, the basic structure is consistent with the basic embodiment, except that: the screw slide mechanism 49 in the upper and lower pallet return mechanism 4 is replaced with a synchronous belt lifting mechanism, and the slider 410 is fixedly connected to the belt of the synchronous belt lifting mechanism; the push bar 415 is replaced with a rectangular structure instead of a right-angled trapezoidal structure, and a 15° guide slope is provided at one end facing the receiving plate 411; the lower conveyor 43 adopts a roller conveyor structure instead of a belt conveyor structure. All of the above modifications can achieve fully automatic circulation and stable conveying of the pallet 45, and are suitable for heavy-duty liquid storage tank production scenarios with higher lifting speed requirements and greater pallet load capacity, falling within the protection scope of the present invention.

[0053] Application Example 2 of this Solution Another embodiment of the present invention has the same basic structure as the basic embodiment, except that: an industrial camera three is added to the pre-inspection mechanism 1, installed inside the right end of the upper cover marking box 11, for detecting the clarity and integrity of the marking by the laser marking device 12; an industrial camera four is added to the post-inspection mechanism 3, installed inside the right end of the sealing plug assembly box 35, for detecting the sealing performance of the plug installation of the plug assembly device 36; both the first scanning device 117 and the second scanning device 37 are replaced by fixed scanning devices with cantilevered scanning guns that can be adjusted vertically. The above-mentioned modifications further improve the whole-process quality inspection and traceability system, are suitable for flexible production scenarios involving mixed lines of multiple sizes and models of liquid storage tanks, and fall within the protection scope of the present invention.

[0054] Application Example 3 of this Solution Another embodiment of the present invention has the same basic structure as the basic embodiment, except that: an oil filling reserved station 33 is enabled and equipped with a quantitative oil filling device; a nitrogen filling reserved station 34 is enabled and equipped with a high-precision pressure-controlled nitrogen filling device; the detection pressure of the helium detector 2 is adjusted to 0.8 MPa and the pressure holding time is 15 s; the length of the right-side upper and lower tray return mechanism 4 is extended by 1.2 m to accommodate the flow requirements of the newly added station's tray 45. The above-mentioned modified scheme retains the integrated layout of the production line and the core function of automatic tray return, and is suitable for the full-process assembly production scenario of high-pressure, large-capacity refrigeration storage tanks, falling within the protection scope of the present invention.

[0055] The present invention comprises: 1-Pre-inspection mechanism; 11-Upper cover coding box; 12-Laser coding device; 13-Upper cover and pipe expansion joint box; 14-Pipe storage tank; 15-Sealing ring installer; 16-Filter screen pressing box; 17-Filter screen pressing fixture; 18-Camera bracket one; 19-Industrial camera one; 110-Drying package fixing box; 111-Drying package binding fixture; 112-Drying package storage constant temperature and humidity chamber; 113-Camera bracket two; 114-Industrial camera two; 115-Welding box; 116-Cylinder laser welding device; 117-Scanning device one; 118-Control device one; 2-Helium detection equipment; 3-Post-inspection mechanism; 31-Bracket mounting box; 32-Bracket mounting device; 33-Oil filling reserved station; 34-Nitrogen filling reserved station; 35-Sealing plug assembly box; 36-Plug assembly device; 37-Scanning device two; 38-Control device two; 4 - Upper and lower pallet return mechanism; 41- Upper conveyor; 42- Baffle; 43- Lower conveyor; 44- Connecting plate; 45- Pallet; 46- Return box; 47- Lifting groove; 48- Lifting plate; 49- Screw slide mechanism; 410- Slider; 411- Receiving plate; 412- Groove one; 413- Groove two; 414- Multi-stage cylinder; 415- Push bar; 416- Through groove; 417- Base. These components are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problem solved by this invention is that the existing liquid storage tank assembly is mostly at independent workstations, and the products need to be frequently handled manually, resulting in low turnover efficiency and high labor intensity; there is no unified integrated line, the equipment is scattered, and the space utilization rate is low; moreover, empty pallets need to be handled manually, which affects the cycle time and increases labor costs. This invention effectively addresses the pain points of traditional assembly lines through automatic pallet return, integrated continuous production, intelligent quality control, and flexible design, achieving cost reduction and efficiency improvement, quality control, and production line upgrades, providing a reliable solution for the efficient and intelligent assembly of liquid storage tanks.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A liquid storage tank assembly line, characterized in that: It includes a pre-inspection mechanism (1), a helium detection device (2), a post-inspection mechanism (3), and an upper and lower tray return mechanism (4). The pre-inspection mechanism (1), the helium detection device (2), and the post-inspection mechanism (3) are respectively arranged in a left-middle-right structure. The upper and lower tray return mechanism (4) is respectively located inside the pre-inspection mechanism (1) and at the front end of the upper and lower tray return mechanism (4). The pre-inspection mechanism (1) includes a top cover marking box (11), a laser marking device (12), a top cover and pipe expansion joint box (13), a pipe storage tank (14), a sealing ring installer (15), a filter screen pressing box (16), a filter screen pressing fixture (17), a camera bracket one (18), an industrial camera one (19), a dryer bag fixing box (110), a dryer bag binding fixture (111), a dryer bag storage constant temperature and humidity chamber (112), a camera bracket two (113), an industrial camera two (114), a welding box (115), and a cylinder laser welding device. (116), a barcode scanning device (117) and a control device (118), wherein the laser marking device (12) is located inside the upper cover marking box (11), the upper cover and pipe expansion joint box (13) is located at the right end of the upper cover marking box (11), the pipe storage tank (14) and the sealing ring installer (15) are located inside the upper cover and pipe expansion joint box (13), the filter screen pressing box (16) is located at the right end of the upper cover and pipe expansion joint box (13), and the filter screen pressing fixture (17) is located at the filter screen pressing box. Inside the box (16), the camera bracket one (18) is located at the right end of the filter press box (16), the industrial camera one (19) is located at the left end of the camera bracket one (18), the dryer bag fixing box (110) is located at the right end of the filter press box (16), the dryer bag binding fixture (111) is located inside the dryer bag fixing box (110), the dryer bag storage constant temperature and humidity chamber (112) is located at the left end of the dryer bag binding fixture (111), and the camera bracket two (11... 3) The industrial camera 2 (114) is located at the right end inside the drying package fixing box (110), the industrial camera 2 (114) is located at the left end of the camera bracket 2 (113), the welding box (115) is located at the right end of the drying package fixing box (110), the cylindrical laser welding device (116) is located inside the welding box (115), the barcode scanning device 1 (117) is located at the right end of the cylindrical laser welding device (116), and the control device 1 (118) is located at the front end of the upper half of the barcode scanning device 1 (117).

2. The liquid storage tank assembly line according to claim 1, characterized in that: The laser marking device (12) is located in the rear half of the upper cover marking box (11).

3. The liquid storage tank assembly line according to claim 2, characterized in that: The pipeline storage tank (14) and the sealing ring installer (15) are both located in the rear half of the upper cover and the pipeline expansion joint box (13), with the sealing ring installer (15) and the pipeline storage tank (14) distributed on the left and right respectively.

4. The liquid storage tank assembly line according to claim 3, characterized in that: The filter press fixture (17) is located in the rear half of the filter press box (16). The drying package binding fixture (111) and the drying package storage constant temperature and humidity chamber (112) are both located in the rear half of the drying package fixing box (110). The cylinder laser welding device (116) and the barcode scanning device (117) are both located in the rear half of the welding box (115).

5. The liquid storage tank assembly line according to claim 4, characterized in that: The scanning device (117) is signal-connected to the control device (118), and the control device (118) is control-connected to the cylinder laser welding device (116).

6. The liquid storage tank assembly line according to claim 5, characterized in that: The post-inspection mechanism (3) includes a bracket mounting box (31), a bracket mounting device (32), an oil filling reserved station (33), a nitrogen filling reserved station (34), a sealing plug assembly box (35), a plug assembly device (36), a barcode scanning device (37), and a control device (38). The bracket mounting box (31) is located at the right end of the helium inspection equipment (2), and the bracket mounting device (32) is located inside the bracket mounting box (31). (33) and nitrogen filling reserved station (34) are respectively set on the right end of the bracket mounting box (31), the sealing plug assembly box (35) is set on the right end of the nitrogen filling reserved station (34), the plug assembly device (36) is set inside the sealing plug assembly box (35), the second scanning device (37) is set on the right end of the plug assembly device (36), and the second control device (38) is set on the left end of the plug assembly device (36).

7. The liquid storage tank assembly line according to claim 6, characterized in that: The second scanning device (37) is signal-connected to the second control device (38), and the second control device (38) is control-connected to the plug assembly device (36).

8. The liquid storage tank assembly line according to claim 9, characterized in that: The upper and lower pallet return mechanism (4) includes an upper conveying device (41), a baffle (42), a lower conveying device (43), a connecting plate (44), a pallet (45), a return box (46), a lifting groove (47), a lifting plate (48), a screw slide mechanism (49), a slider (410), a receiving plate (411), a first groove (412), a second groove (413), a multi-stage cylinder (414), a push bar (415), a through groove (416), and a base (417). The baffle (42) is located at the top of the front and rear ends of the upper conveying device (41), and the lower conveying device (45) is located at the top of the lower conveying device (46). 3) The connecting plate (44) is equidistantly arranged at the front and rear ends between the upper conveyor (41) and the baffle (42) and is located below the upper conveyor (41). The tray (45) is arranged on the upper conveyor (41). The return box (46) is arranged opposite to the left and right ends of the upper conveyor (41) and the lower conveyor (43). The lifting groove (47) is arranged inside each return box (46). The lifting plate (48) is arranged inside each lifting groove (47). The screw slide mechanism (49) is arranged on each lifting plate. Inside and at the top of each of the lifting plates (48), the slider (410) is disposed inside each of the lifting plates (48), the receiving plate (411) is disposed outside each of the sliders (410) and located inside the lifting groove (47), the first groove (412) is disposed opposite to each other at the inner end of each of the receiving plates (411), the second groove (413) is disposed opposite to each other on the outer wall of each return box (46), the multi-stage cylinder (414) is disposed outside each of the second groove (413) and connected to the return box (46), and the push bar (415) is disposed inside and at the top of each of the lifting plates (48). The output end of each of the multi-stage cylinders (414) extends inward toward the adjacent groove two (413). The through grooves (416) are respectively located in the front half of the interior of the upper cover marking box (11), the upper cover and pipe expansion box (13), the filter screen pressing box (16), the drying package fixing box (110), and the welding box (115). The base (417) is located at the bottom of the left return box (46) in the upper and lower tray return mechanism (4) located on the left and at the bottom of the two return boxes (46) in the upper and lower tray return mechanism (4) located on the right.

9. A liquid storage tank assembly line according to claim 8, characterized in that: The baffle (42) has a rectangular structure. The height of the baffle (42) is higher than the height of the tray (45), and the tray (45) is integrally formed with the front and rear ends of the upper conveying device (41). The lower conveying device (43) and the connecting plate (44) are integrally formed with the upper conveying device (41). The height of the through groove (416) is equal to the sum of the heights of the upper conveying device (41), the baffle (42), the lower conveying device (43), and the connecting plate (44). The return box (4) at the right end of the lower tray return mechanism (4) on the left side is... 6) The right end of the through groove (416) inside the welding box (115) does not exceed the right end of the welding box (115), the left end of the lower tray return mechanism (4) on the left side exceeds the left end of the upper cover marking box (11), and the lower tray return mechanism (4) on the right side is located at the front end of the bracket mounting box (31) and the sealing plug assembly box (35) and stands on the ground. The height of the second groove (413) on the left side of each lower tray return mechanism (4) is higher than the height of the second groove (413) on the right side.

10. A liquid storage tank assembly line according to claim 9, characterized in that: The slider (410) and the receiving plate (411) are integrally formed. The push bar (415) has a right-angled trapezoidal structure with the inclined surface of the trapezoid facing upward. The length of the push bar (415) is equal to the sum of the depth of the second groove (413) and the depth of the first groove (412).

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