An unmanned production line of an expansion water tank

Abstract

The application provides an unmanned production line of an expansion water tank, a first servo feeder is arranged to connect a first plate material leveling machine and a first hydraulic stretcher, a first manipulator is arranged to perform material taking and placing transfer work of an upper shell at the first hydraulic stretcher and a first puncher; meanwhile, a second servo feeder is arranged to connect a second plate material leveling machine and a second hydraulic stretcher, a second manipulator is arranged to perform material taking and placing transfer work of a lower shell at the second hydraulic stretcher and a hydraulic edge trimmer, and a third manipulator is arranged to perform material taking and placing transfer work of the lower shell between the hydraulic edge trimmer, a second puncher and an automatic edge rolling machine; thus, the unmanned production line of the upper shell production and the lower shell production is formed, the manual operation is replaced by production machines and manipulators, automation and unmanned operation are realized, the production efficiency and the yield are improved, the labor of workers is reduced, the labor cost is reduced, and the production safety hidden danger is eliminated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of production of expansion water tank, and particularly relates to an unmanned production line for expansion water tank. BACKGROUND

[0002] The expansion water tank is an important component in the wall-hanging stove and heating, ventilation and air conditioning system, and plays a role in water storage and pressure setting in the heating system. The production line for the expansion water tank in the prior art involves various processes that need various production machines and manual work. The manual work is required for taking and placing materials and auxiliary processing between different production machines. Therefore, the production efficiency and product quality of the expansion water tank are greatly affected by the production experience and working state of the workers, and it is difficult to guarantee stable productivity and unified quality, and most importantly, it is difficult to completely avoid the occurrence of work accidents in the labor process. In view of the above-mentioned phenomena and problems, the present application proposes an unmanned production line for the expansion water tank. According to the characteristics of the expansion water tank composed of multiple shells, the distribution of related production machines is adjusted, a mechanical hand unit is introduced, the production process is optimized, the production rhythm is stabilized, the production efficiency and yield are improved, the labor cost is reduced, and the production safety hazards are eliminated. SUMMARY

[0003] In view of the above-mentioned problems, the present application proposes an unmanned production line for the expansion water tank. The distribution of related production machines is adjusted, a mechanical hand unit is introduced, the production process is optimized, the production rhythm is stabilized, the production efficiency and yield are improved, the labor cost is reduced, and the production safety hazards are eliminated.

[0004] To achieve the above object, the present application provides an unmanned production line of an expansion water tank, comprising a feeding unit, a shell forming unit, a manipulator unit and a waste collecting unit; the feeding unit comprises a first servo feeder for automatically feeding plate materials for manufacturing upper shells and a second servo feeder for automatically feeding plate materials for manufacturing lower shells; the shell forming unit comprises a first hydraulic stretcher, a second hydraulic stretcher, a hydraulic edge trimmer, a first puncher, a second puncher and an automatic crimping machine; the first hydraulic stretcher and the second hydraulic stretcher are respectively used for stretching the plate materials of the upper shell and the lower shell, and are both provided with a stretching platform for carrying workpieces and a mold slider for stretching the workpieces, wherein the stretching platform of the first hydraulic stretcher is connected with a discharge port of the first servo feeder, and the stretching platform of the second hydraulic stretcher is connected with a discharge port of the second servo feeder; the hydraulic edge trimmer is arranged at the rear side of the second hydraulic stretcher and is provided with a workbench for carrying the workpieces and a mold cutter for trimming the edges of the workpieces; the first puncher and the second puncher are respectively used for punching the upper shell and the lower shell, and are both provided with a punching platform for carrying the workpieces and a punching punch for punching the workpieces, wherein the first puncher is arranged at the rear side of the first hydraulic stretcher, and the second puncher is arranged at the rear side of the hydraulic edge trimmer; the automatic crimping machine is arranged at the rear side of the second puncher and comprises a crimping platform with adjustable angle for placing the workpieces and a crimping pressure roller set; the manipulator unit comprises a first manipulator, a second manipulator and a third manipulator, all of which are provided with clamping members at the ends, wherein the first manipulator is arranged between the first hydraulic stretcher and the first puncher and is used for transferring the workpieces between the stretching platform of the first hydraulic stretcher and the punching platform of the first puncher; the second manipulator is arranged between the second hydraulic stretcher and the hydraulic edge trimmer and is used for transferring the workpieces between the stretching platform of the second hydraulic stretcher and the workbench of the hydraulic edge trimmer; the third manipulator is arranged between the hydraulic edge trimmer, the second puncher and the automatic crimping machine and is used for transferring the workpieces between the workbench of the hydraulic edge trimmer and the punching platform of the second puncher and between the punching platform of the second puncher and the crimping platform of the automatic crimping machine; the waste collecting unit comprises a waste conveying belt and a waste collecting frame, one end of the waste conveying belt is arranged on the workbench of the hydraulic edge trimmer, the other end is arranged at the waste collecting frame, and the waste collecting frame is arranged at one side of the hydraulic edge trimmer.

[0005] Preferably, the shell forming unit further comprises a gas nozzle welding machine arranged at the rear side of the first puncher and a water nozzle welding machine arranged at the rear side of the automatic crimping machine, the gas nozzle welding machine and the water nozzle welding machine each comprise a welding head and an angle-adjustable welding table, wherein the welding table of the gas nozzle welding machine is connected to the first puncher through a conveying belt, and the welding table of the water nozzle welding machine is connected to the automatic crimping machine through a conveying belt.

[0006] Preferably, the pre-processing unit further comprises a first plate flattening machine connected to the feeding port of the first servo feeder and a second plate flattening machine connected to the feeding port of the second servo feeder; a plurality of sets of flattening rollers are arranged on the first plate flattening machine and the second plate flattening machine.

[0007] Preferably, the first, second and third mechanical arms are six-axis mechanical arms, and the clamping member is a vacuum suction clamp.

[0008] Preferably, the first servo feeder and the second servo feeder each are provided with a material blocking rod for limiting the width of the plate material at the feeding port, a connecting plate for connecting the stamping unit at the discharging port, and a synchronous belt for step-by-step conveying of the plate material between the feeding port and the discharging port.

[0009] Preferably, the waste conveying belt is provided with a cleaning brush at one end close to the waste collecting frame, the bristles of the cleaning brush face the surface of the waste conveying belt and are fixed below the waste conveying belt.

[0010] Preferably, the splicing transfer table is arranged between the rear sides of the gas nozzle welding machine and the water nozzle welding machine and is connected to the gas nozzle welding machine and the water nozzle welding machine through a conveying belt respectively.

[0011] Preferably, the temperature control unit comprises a plurality of industrial refrigerators, which are distributed at various positions of the unmanned production line.

[0012] Preferably, the first servo feeder, the second servo feeder, the first plate flattening machine, the second plate flattening machine, the first hydraulic stretcher, the second hydraulic stretcher, the first mechanical arm, the second mechanical arm, the third mechanical arm, the hydraulic edge trimmer, the first puncher, the second puncher, the automatic crimping machine, the gas nozzle welding machine and the water nozzle welding machine are each provided with a corresponding hydraulic power system for providing driving power and an electrical control box electrically connected to the hydraulic power system.

[0013] Preferably, a PLC control unit is further arranged, which is electrically connected with the electrical control boxes of the first servo feeder, the second servo feeder, the first plate leveling machine, the second plate leveling machine, the first hydraulic stretcher, the second hydraulic stretcher, the hydraulic edge trimmer, the first puncher, the second puncher and the automatic edge curling machine, and is used for controlling the first servo feeder, the second servo feeder, the first plate leveling machine, the second plate leveling machine, the first hydraulic stretcher, the second hydraulic stretcher, the hydraulic edge trimmer, the first puncher, the second puncher and the automatic edge curling machine to realize the full-automatic working process.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows: the unmanned production line for the expansion water tank provided by the present application is arranged according to the characteristics that the outer shell of the expansion water tank is usually composed of two parts of an upper shell and a lower shell, a first servo feeder is arranged to connect the first plate leveling machine and the first hydraulic stretcher, a first mechanical arm is arranged to perform the material taking and placing transfer work of the upper shell between the first hydraulic stretcher and the first puncher, and an unmanned production line for the upper shell is formed, which includes the processes of plate pretreatment, plate feeding, stretching forming and upper shell punching. Meanwhile, a second servo feeder is arranged to connect the second plate leveling machine and the second hydraulic stretcher, a second mechanical arm is arranged to perform the material taking and placing transfer work of the lower shell between the second hydraulic stretcher and the hydraulic edge trimmer, a third mechanical arm is arranged to perform the material taking and placing transfer work of the lower shell between the hydraulic edge trimmer, the second puncher and the automatic edge curling machine, and an unmanned production line for the lower shell is formed, which includes the processes of inner plate pretreatment, plate feeding, stretching forming, lower shell edge trimming, lower shell punching and lower shell edge curling. In addition, a waste conveying belt is arranged to connect the hydraulic edge trimmer and the waste collecting frame to automatically clean the waste material generated by the edge trimming. The present application adjusts the distribution of the related production machines, introduces the mechanical arm unit, forms two unmanned production lines for the upper shell production and the lower shell production which run simultaneously and do not interfere with each other, and only needs to set the related setting value requirements at the beginning of single production, and then the production machines and the mechanical arms can replace the manual operation of the workers to realize automation and unmanned operation, improve the production efficiency and the yield, reduce the labor of the workers, reduce the labor cost, and eliminate the production safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the unmanned production line for the expansion water tank.

[0016] In the figure: 11-first plate straightener, 12-second plate straightener, 13-feeding structure, 14-roller, 15-transmission structure, 21-first servo feeder, 22-second servo feeder, 23-material blocking rod, 24-connection plate, 25-synchronous belt, 31-first hydraulic stretcher, 32-second hydraulic stretcher, 33-stretching platform, 34-mold sliding block, 41-hydraulic edge trimmer, 42-workbench, 43-mold cutter, 44-automatic edge roller, 45-edge roller platform, 46-second angle adjustment cylinder group, 47-edge roller group, 51-first puncher, 52-second puncher, 53-punching platform, 54-punching punch, 61-gas nozzle welder, 62-water nozzle welder, 63-welding head, 64-welding table, 65-first angle adjustment cylinder group, 66-third angle adjustment cylinder group, 67-splicing transfer table, 71-first manipulator, 72-second manipulator, 73-third manipulator, 74-clamping piece, 81-waste conveyor belt, 82-waste collection frame, 91-industrial refrigeration machine. DETAILED DESCRIPTION

[0017] To further illustrate the present application, the following embodiments will be described in conjunction with the accompanying drawings. It is particularly pointed out that the embodiments described below are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0018] Reference Figure 1 The present embodiment provides an unmanned production line for an expansion tank, which is composed of a plurality of shells spliced together to form a tank body. The automatic production and processing of the upper shell and the lower shell of the expansion tank are realized, specifically including a PLC control unit, a pretreatment unit, a feeding unit, a shell forming unit, a manipulator unit, a waste collection unit and a refrigeration unit.

[0019] The pretreatment unit includes a first plate straightener 11 and a second plate straightener 12 arranged side by side, which respectively straighten the working plate for the upper shell and the working plate for the lower shell. In the present embodiment, the first plate straightener 11 and the second plate straightener 12 of the pretreatment unit each include a feeding structure 13, a plurality of straightening rollers 14 and a transmission structure 15. In the present embodiment, two sets of straightening rollers 14 are provided, and the transmission structure 15 is used to guide the movement of the rolled plate and deliver the straightened plate.

[0020] The feeding unit comprises a first servo feeder 21 and a second servo feeder 22. The first servo feeder 21 is arranged at the rear side of the first plate flattening machine 11, the feeding port of the first servo feeder 21 is connected with the discharging port of the first plate flattening machine 11, and the discharging port of the first servo feeder 21 is connected with the stretching platform 33 of the first hydraulic stretcher 31, so as to automatically feed the plate material for the upper shell; the second servo feeder 22 is arranged at the rear side of the second plate flattening machine 12, the feeding port of the second servo feeder 22 is connected with the discharging port of the second plate flattening machine 12, and the discharging port of the second servo feeder 22 is connected with the stretching platform 33 of the second hydraulic stretcher 32, so as to automatically feed the plate material for the lower shell; in the embodiment, the first servo feeder 21 and the second servo feeder 22 of the feeding unit are both provided with adjustable spacing material blocking rods 23 for limiting the width of the plate material at the feeding port, are provided with connecting plates 24 for connecting the stamping unit at the discharging port, and are provided with synchronous belts 25 for step conveying the plate material between the feeding port and the discharging port.

[0021] The shell forming unit is provided with a first hydraulic stretcher 31, a second hydraulic stretcher 32, a hydraulic edge trimmer 41, a first puncher 51, a second puncher 52, an automatic edge roller 44, an air faucet welder 61 and a water faucet welder 62, and a splicing transfer table 67 is arranged between the rear sides of the air faucet welder 61 and the water faucet welder 62. The mechanical arm unit comprises a first mechanical arm 71, a second mechanical arm 72 and a third mechanical arm 73. The first mechanical arm 71, the second mechanical arm 72 and the third mechanical arm 73 are all six-axis mechanical arms, and pneumatic vacuum chuck type clamping pieces 74 are installed at the six-axis flange positions of the front ends of the first mechanical arm 71, the second mechanical arm 72 and the third mechanical arm 73 to carry and adjust the workpieces in the automatic processing procedures in production;

[0022] The first hydraulic stretching machine 31 includes a stretching platform 33 and a mold slider 34. The mold slider 34 moves up and down to stamp and stretch the sheet metal for making the upper shell. A first punching machine 51 is mounted on the opposite side of the stretching platform 33, which is connected to the discharge port of the first servo feeder 21. The first punching machine 51 is equipped with a punching platform 53 and a punching punch 54 for punching holes in the upper shell. A first robotic arm 71 is positioned between the first hydraulic stretching machine 31 and the first punching machine 51 to clamp and transfer the upper shell stretched by the first hydraulic stretching machine 31 to the punching platform 53 of the first punching machine 51 for specific punching processing. A gas nozzle welding machine 61 is mounted behind the first punching machine 51, and the two are connected by a conveyor belt (not shown) to facilitate the welding of the punched parts. The completed upper shell is automatically conveyed to the nozzle welding machine 61 for nozzle welding. The nozzle welding machine 61 includes a welding head 63, an adjustable welding table 64, and a first angle adjustment cylinder group 65. The other end of the nozzle welding machine 61 is connected to the splicing transfer table 67 via a conveyor belt (not shown in the figure). After the nozzle welding of the upper shell is completed on the welding table 64, the first angle adjustment cylinder group 65 drives the adjustment of the angle of the welding table 64 to tilt it, thereby smoothly placing the upper shell onto the conveyor belt (not shown in the figure) between the nozzle welding machine 61 and the splicing transfer table 67, so that it is automatically conveyed to the splicing transfer table 67, thus completing the production and collection of the expansion tank upper shell. In this embodiment, the nozzle welding machine 61 is also equipped with an automatic nozzle feeding adjustment frame (not shown in the figure).

[0023] Meanwhile, the second hydraulic stretching machine 32 also includes a stretching platform 33 and a mold slider 34. The mold slider 34 moves up and down to press and stretch the sheet metal for making the lower shell. On the opposite side of the stretching platform 33, which is connected to the discharge port of the second servo feeder 22, a hydraulic trimming machine 41 is provided. A second robot arm 72 is provided between the second hydraulic stretching machine 32 and the hydraulic trimming machine 41 to clamp and transfer the lower shell stretched by the second hydraulic stretching machine 32 to the worktable 42 of the hydraulic trimming machine 41 for trimming the lower shell. A second punching machine 52, an automatic edge rolling machine 44, and a water tap welding machine are sequentially provided on the rear side of the hydraulic trimming machine 41. Machine 62, the hydraulic edge trimming machine 41 includes a worktable 42 and a die cutter 43, the die cutter 43 moves up and down to trim the lower shell, the first punching machine 51 includes a punching platform 53 and a punching punch 54 for punching holes in the lower shell, the automatic edge rolling machine 44 includes an adjustable edge rolling platform 45, a second angle adjusting cylinder group 46 and an edge rolling pressure roller group 47 for edge rolling the lower shell; and a third robot arm 73 is provided on one side of the hydraulic edge trimming machine 41, the second punching machine 52 and the automatic edge rolling machine 44, for sequentially clamping and transferring the lower shell after edge trimming by the automatic edge rolling machine 44 to the punching platform 53 of the second punching machine 52 for specific processing. The upper shell is punched, and then transferred from the punching platform 53 of the second punching machine 52 to the edge-rolling platform 45 of the automatic edge-rolling machine 44 for edge-rolling. A water tap welding machine 62 is set behind the automatic edge-rolling machine 44 and the two are connected by a conveyor belt (not shown in the figure). After the lower shell is edge-rolled, the second angle adjustment cylinder group 46 drives the adjustment of the angle of the edge-rolling platform 45 to tilt it, so as to smoothly place the lower shell onto the conveyor belt (not shown in the figure) between the automatic edge-rolling machine 44 and the water tap welding machine 62, so that it is automatically transported to the water tap welding machine 62. The water tap welding machine 62 includes a welding head 63 and an adjustable... The machine includes a welding table 64 with an angle and a third angle adjusting cylinder assembly 66. The other end of the water nozzle welding machine 62 is connected to the splicing transfer platform 67 via a conveyor belt (not shown). After the lower shell completes water nozzle welding on the welding table 64, the third angle adjusting cylinder assembly 66 drives the welding table 64 to tilt, thus smoothly placing the lower shell onto the conveyor belt (not shown) between the water nozzle welding machine 62 and the splicing transfer platform 67, allowing it to be automatically transported to the splicing transfer platform 67, thereby completing the production and collection of the expansion tank lower shell. In this embodiment, the water nozzle welding machine 62 is also equipped with an automatic water nozzle feeding adjustment frame (not shown).

[0024] Furthermore, the waste collection unit includes a waste conveyor belt 81 and a waste collection frame 82. One end of the waste conveyor belt 81 is connected to one side of the worktable 42 of the hydraulic edge trimming machine 41, and the other end is located above the waste collection frame 82 for automatic transmission and collection of waste generated during the lower shell edge trimming process. In this embodiment, a cleaning brush (not shown in the figure) is provided near the end of the waste conveyor belt 81 close to the waste collection frame 82. The bristles of the cleaning brush face the surface of the waste conveyor belt 81 and are fixed below the waste conveyor belt 81. During the process, after the waste is transferred to the waste collection box 82, its surface will automatically pass through the cleaning brush to complete the cleaning; the refrigeration unit includes multiple sets of industrial refrigeration units 91, which are distributed throughout the unmanned production line to transfer the heat generated by the production machinery and robotic arms involved in each unit through a refrigeration cycle, thereby achieving the purpose of cooling or refrigeration and ensuring the temperature control requirements of the unmanned production line environment; the entire process realizes the automated and unmanned production and processing of the expansion tank shell, reducing labor costs and greatly improving production efficiency.

[0025] In this embodiment, the first servo feeder 21, the second servo feeder 22, the first plate leveler 11, the second plate leveler 12, the first hydraulic stretching machine 31, the second hydraulic stretching machine 32, the first robotic arm 71, the second robotic arm 72, the third robotic arm 73, the hydraulic edge trimming machine 41, the first punching machine 51, the second punching machine 52, the automatic edge rolling machine 44, the air nozzle welding machine 61, and the water nozzle welding machine 62 are all equipped with their respective corresponding hydraulic power systems (not shown in the figure) for providing driving power and are connected to the aforementioned... The electrical control box (not shown in the figure) for the electrical connection of the hydraulic power system, and the PLC control unit (not shown in the figure) are respectively connected to the electrical systems of the first servo feeder 21, the second servo feeder 22, the first plate leveler 11, the second plate leveler 12, the first hydraulic stretching machine 31, the second hydraulic stretching machine 32, the first robot arm 71, the second robot arm 72, the third robot arm 73, the hydraulic edge trimming machine 41, the first punching machine 51, the second punching machine 52, the automatic edge rolling machine 44, the air nozzle welding machine 61, and the water nozzle welding machine 62. The control box is electrically connected and used to control the first servo feeder 21, the second servo feeder 22, the first plate leveler 11, the second plate leveler 12, the first hydraulic stretching machine 31, the second hydraulic stretching machine 32, the first robotic arm 71, the second robotic arm 72, the third robotic arm 73, the hydraulic edge trimming machine 41, the first punching machine 51, the second punching machine 52, the automatic edge rolling machine 44, the air nozzle welding machine 61, and the water nozzle welding machine 62 to achieve a fully automatic workflow. It is worth noting that in this patented solution, the hydraulic power system belongs to... All of these are existing mature technologies. The PLC controller is a logic controller. The electrical connection circuits and signal logic control involved in the remote control of production machinery such as the first servo feeder 21, the second servo feeder 22, the first plate leveler 11, the second plate leveler 12, the first hydraulic stretching machine 31, the second hydraulic stretching machine 32, the hydraulic edge trimming machine 41, the first punching machine 51, the second punching machine 52, and the automatic edge rolling machine 44 are also existing technologies. All of the above are well known in the current field and will not be elaborated on here.

[0026] In this embodiment, the above is merely an example and is not intended to limit the scope of protection of this application.

[0027] This invention provides an unmanned production line for expansion tanks. Taking advantage of the fact that the outer shell of an expansion tank typically consists of an upper shell and a lower shell, a first servo feeder is installed connecting a first sheet metal leveling machine and a first hydraulic stretching machine. A first robotic arm is installed between the first hydraulic stretching machine and a first drilling machine to perform the material handling and transfer of the upper shell, thus forming an unmanned production line for the upper shell, including sheet metal pretreatment, sheet metal feeding, stretching and forming, and upper shell drilling. Simultaneously, a second servo feeder is installed connecting a second sheet metal leveling machine and a second hydraulic stretching machine. A second robotic arm is installed between the second hydraulic stretching machine and a hydraulic edge trimming machine to perform the material handling and transfer of the lower shell. A third robotic arm is installed between the hydraulic edge trimming machine, the second drilling machine, and the automatic edge rolling machine. The process of loading and unloading materials for the lower shell constitutes an unmanned production line for the lower shell, including processes such as sheet pretreatment, sheet loading, stretching and forming, lower shell trimming, lower shell punching, and lower shell hemming. Additionally, a waste conveyor belt connects the hydraulic trimming machine and the waste collection box to automatically clean up waste materials generated during trimming. This patented solution, by adjusting the distribution of relevant production machinery and introducing robotic arms, forms two unmanned production lines for upper and lower shell production that operate simultaneously without interference. Once the relevant preset values ​​are set at the start of each production run, both production machines and robotic arms can replace manual operation, achieving automation and unmanned operation, improving production efficiency and yield, reducing labor costs, and eliminating production safety hazards.

[0028] The embodiments disclosed above are merely for illustrative purposes and should not be construed as limiting the scope of the invention. Therefore, any simple modifications or variations made in accordance with the claims of this invention are still within the scope of protection of this invention.

[0029] The scope of protection of this invention should be determined by the defined scope. For those skilled in the art, various improvements and modifications can be made without departing from the spirit and scope of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. An unmanned production line for expansion tanks, characterized in that, It includes a feeding unit, a shell forming unit, a robotic arm unit, and a waste collection unit; The feeding unit includes a first servo feeder for automatically feeding the sheet metal for making the upper shell and a second servo feeder for automatically feeding the sheet metal for making the lower shell, which are arranged in parallel. The shell forming unit includes a first hydraulic stretching machine, a second hydraulic stretching machine, a hydraulic trimming machine, a first punching machine, a second punching machine, and an automatic edge rolling machine. The first and second hydraulic stretching machines are used for stretching the sheet metal of the upper and lower shells, respectively. Each machine is equipped with a stretching platform for carrying the workpiece and a die slider for stretching the workpiece. The stretching platform of the first hydraulic stretching machine is connected to the discharge port of the first servo feeder, and the stretching platform of the second hydraulic stretching machine is connected to the discharge port of the second servo feeder. The hydraulic trimming machine is installed in the... The second hydraulic stretching machine is provided with a worktable for supporting the workpiece and a die cutter for trimming the workpiece at the rear. The first and second punching machines are used for punching the upper and lower shells respectively, and each is provided with a punching platform for supporting the workpiece and a punching punch for punching the workpiece. The first punching machine is located at the rear of the first hydraulic stretching machine, and the second punching machine is located at the rear of the hydraulic trimming machine. The automatic edge rolling machine is located at the rear of the second punching machine and includes an adjustable edge rolling platform for placing the workpiece and an edge rolling pressure roller assembly. The robotic arm unit includes a first robotic arm, a second robotic arm, and a third robotic arm, each with a clamping component at its end. The first robotic arm is positioned between the first hydraulic stretching machine and the first punching machine, used for transferring workpieces between the stretching platform of the first hydraulic stretching machine and the punching platform of the first punching machine. The second robotic arm is positioned between the second hydraulic stretching machine and the hydraulic trimming machine, used for transferring workpieces between the stretching platform of the second hydraulic stretching machine and the worktable of the hydraulic trimming machine. The third robotic arm is positioned between the hydraulic trimming machine, the second punching machine, and the automatic edge rolling machine, used for transferring workpieces between the worktable of the hydraulic trimming machine and the punching platform of the second punching machine, and between the punching platform of the second punching machine and the edge rolling platform of the automatic edge rolling machine. The waste collection unit includes a waste conveyor belt and a waste collection frame. One end of the waste conveyor belt is set on the worktable of the hydraulic edge trimming machine, and the other end is set at the waste collection frame. The waste collection frame is set on one side of the hydraulic edge trimming machine.

2. The unmanned production line for an expansion tank according to claim 1, characterized in that, The shell forming unit also includes an air nozzle welding machine located behind the first punching machine and a water nozzle welding machine located behind the automatic edge rolling machine. Both the air nozzle welding machine and the water nozzle welding machine include a welding head and an adjustable welding table. The welding table of the air nozzle welding machine is connected to the first punching machine via a conveyor belt, and the welding table of the water nozzle welding machine is connected to the automatic edge rolling machine via a conveyor belt.

3. The unmanned production line for an expansion tank according to claim 2, characterized in that, It also includes a pre-processing unit, which includes a first plate leveler connected to the feed port of the first servo feeder and a second plate leveler connected to the feed port of the second servo feeder; the first plate leveler and the second plate leveler are equipped with multiple sets of leveling rollers.

4. The unmanned production line for an expansion tank according to claim 1, characterized in that, The first, second, and third robotic arms are all configured as six-axis robotic arms, and the gripping device is configured as a vacuum suction cup gripper.

5. The unmanned production line for an expansion tank according to claim 1, characterized in that, Both the first servo feeder and the second servo feeder are equipped with a baffle bar at the feed inlet to limit the width of the plate material, and a connecting plate at the discharge outlet to connect to the shell forming unit. A synchronous belt for stepping and conveying the plate material is provided between the feed inlet and the discharge outlet.

6. The unmanned production line for an expansion tank according to claim 1, characterized in that, A cleaning brush is provided at one end of the waste conveyor belt near the waste collection box. The cleaning brush is fixed below the waste conveyor belt with the brush bristles facing the surface of the waste conveyor belt.

7. The unmanned production line for an expansion tank according to claim 2, characterized in that, It also includes a splicing transfer platform, which is located between the rear sides of the air nozzle welding machine and the water nozzle welding machine, and is connected to the air nozzle welding machine and the water nozzle welding machine respectively via a conveyor belt.

8. The unmanned production line for an expansion tank according to claim 1, characterized in that, It also includes a temperature control unit, which comprises multiple industrial refrigeration units distributed throughout the unmanned production line.

9. The unmanned production line for an expansion tank according to claim 3, characterized in that, The first servo feeder, the second servo feeder, the first plate leveler, the second plate leveler, the first hydraulic stretching machine, the second hydraulic stretching machine, the first robot arm, the second robot arm, the third robot arm, the hydraulic edge trimmer, the first punching machine, the second punching machine, the automatic edge rolling machine, the air nozzle welding machine, and the water nozzle welding machine are all equipped with their respective hydraulic power systems for providing driving power and electrical control boxes that are electrically connected to the hydraulic power systems.

10. The unmanned production line for an expansion tank according to claim 9, characterized in that, A PLC control unit is also provided, which is electrically connected to the electrical control boxes of the first servo feeder, the second servo feeder, the first plate leveler, the second plate leveler, the first hydraulic stretching machine, the second hydraulic stretching machine, the hydraulic edge trimmer, the first punching machine, the second punching machine, and the automatic edge rolling machine, respectively, and is used to control the first servo feeder, the second servo feeder, the first plate leveler, the second plate leveler, the first hydraulic stretching machine, the second hydraulic stretching machine, the hydraulic edge trimmer, the first punching machine, the second punching machine, and the automatic edge rolling machine to achieve a fully automatic working process.

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