CN215658934U

CN215658934U - Automatic production line for gas storage tank

Info

Publication number: CN215658934U
Application number: CN202121384288.9U
Authority: CN
Inventors: 钟仁志; 李中权; 金鑫
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2022-01-28
Anticipated expiration: 2031-06-22

Abstract

The utility model relates to the field of air compressors, in particular to an automatic production line for an air storage tank. The production line comprises a gas storage tank assembly line, a circular seam welding line, a bracket welding line and a gas storage tank testing line; the assembly line of the gas storage tank comprises tank body discharging equipment, leveling and feeding equipment, automatic punching equipment, longitudinal seam welding equipment, automatic rotary cutting equipment and necking assembly equipment which are arranged along the product conveying direction; the production line is provided with a gas storage tank assembly line, a circular seam welding line, a support welding line and a gas storage tank testing line, wherein the gas storage tank is automatically formed and subjected to longitudinal seam welding, circular seam welding, support welding and tightness testing respectively, and the gas storage tank assembly line, the circular seam welding line, the support welding line and the gas storage tank testing line are automatically transmitted through a conveying line; thereby reducing the labor intensity of workers and improving the production efficiency and the automation degree of the whole equipment.

Description

Automatic production line for gas storage tank

Technical Field

The utility model relates to the field of air compressors, in particular to an automatic production line for an air storage tank.

Background

The gas storage tank is a device specially used for storing gas and plays a role in stabilizing the pressure of the system. The gas storage tank can be divided into a high-pressure gas storage tank, a low-pressure gas storage tank and a normal-pressure gas storage tank according to different bearing pressures of the gas storage tanks. The gas storage tank can be divided into a carbon steel gas storage tank, a low alloy steel gas storage tank and a stainless steel gas storage tank according to different materials of the gas storage tank. The gas storage tank generally comprises parts and components such as a cylinder body, a seal head, a flange, a connecting pipe, a sealing element, a support and the like. In addition, it is also equipped with safety device, meter and internal components for implementing different production processes.

The existing gas storage tank production line is shown in fig. 1, and comprises a winding drum station 101, a blank pressing station 102, a longitudinal seam welding station 103, a rounding station 104, a head knocking station 105, a head pressing station 106, a welding station 107 and a testing station 108 which are arranged along the product conveying direction; during production, the end socket is formed by blanking a steel plate, manually lifting the steel plate, placing the steel plate on a stretch forming die for forming (manually laminating a film on the steel plate before stretching), and then necking the steel plate by a necking machine; the tank body is formed by lifting a steel plate by a worker, placing the steel plate on a plate shearing machine for blanking and cutting, transferring the tank body material which is discharged by a forklift to a punch press, and manually lifting the tank body material to place the tank body material on a punching die for punching; manually lifting the tank body to be placed on a winding drum of a plate bending machine of a winding drum station 101, and moving the tank body to a blank pressing station 102 to blank both ends of the tank body; after the longitudinal seam welding station 103 welds the longitudinal seam, the tank body is subjected to roundness correction at the rounding station 104; knocking the end enclosure into two ends of the tank body at an end enclosure knocking station 105, and pressing the end enclosure to the tank body at an end enclosure pressing station 106; and finally, respectively welding the end socket, the support, the connecting pipe and the steel plate handle to the tank body at a welding station 107, and testing the gas storage tank at a testing station 108 to finish the production process of the gas storage tank.

The prior art has the following defects: when the gas storage tank is formed and welded, each process is independently finished on a single workbench manually, and then the product is moved to the next workbench for processing manually, and finally the gas storage tank forming and welding process is finished; and each process needs manual participation and auxiliary blanking circulation, so that the automation degree of the whole equipment is low.

Disclosure of Invention

The purpose of the utility model is: aiming at the problems, the method is provided with an air storage tank assembly line, a circular seam welding line, a support welding line and an air storage tank testing line, wherein the air storage tank is automatically formed and subjected to longitudinal seam welding, circular seam welding, support welding and tightness testing respectively, and the air storage tank assembly line, the circular seam welding line, the support welding line and the air storage tank testing line are automatically transmitted through a transmission line; thereby reducing the labor intensity of workers and improving the production efficiency and the automation degree of the whole equipment.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an automatic production line for a gas storage tank comprises a gas storage tank assembly line, a circular seam welding line, a bracket welding line and a gas storage tank testing line; the assembly line of the gas storage tank comprises tank body discharging equipment, leveling and feeding equipment, automatic punching equipment, longitudinal seam welding equipment, automatic rotary cutting equipment and necking assembly equipment which are arranged along the product conveying direction; the circular seam welding line comprises a plurality of circular seam welding conveyor belts and circular seam automatic welding equipment, the feeding ends of the plurality of circular seam conveyor belts are respectively connected with the discharging ends of the equipment by a necking group in a plurality of gas storage tank assembly lines, and the plurality of circular seam automatic welding equipment are respectively positioned on different circular seam welding stations on two sides of the circular seam conveyor belts; the support welding line comprises a support welding conveyer belt and automatic support welding equipment, the feeding end of the support welding conveyer belt is connected with the discharging ends of the multiple circular seam conveyer belts, and the multiple automatic support welding equipment are respectively positioned at support welding stations at two sides of the support welding conveyer belt; the gas storage tank test line comprises a plurality of gas tightness test devices, and the gas tightness test devices are respectively positioned at a plurality of test stations on two sides of the support welding conveying belt.

Preferably, the plurality of air tank assembly lines are distributed in parallel with each other along the product conveying direction. The width of the plurality of girth welding conveyer belts is respectively adapted to the width of the gas storage tanks with the same specification or different specifications.

Preferably, the longitudinal seam welding equipment comprises a longitudinal seam conveying belt, two-end correcting devices of the tank body, a middle correcting device of the tank body and an automatic longitudinal seam welding device; the feeding end and the discharging end of the longitudinal seam conveying belt are respectively connected with the discharging end of the automatic punching equipment and the feeding end of the automatic rotary cutting equipment, and the correcting ends of the two-end correcting device and the middle correcting device of the tank body are respectively contacted with the two-end opening end and the middle part of the tank body of the gas storage tank; the welding end of the automatic longitudinal seam welding device is in contact with the longitudinal seam of the tank body.

Preferably, the automatic rotary cutting equipment comprises a rotary cutting workbench, a rotary cutting conveyer belt, a rotary cutting frame, a rotary cutting motor, a rotary cutting knife rest, a rotary cutting knife, a feed oil cylinder and a feed ejector rod; two ends of the rotary cutting conveyer belt are respectively connected with the discharge end of the longitudinal seam welding equipment and the feed end of the necking assembly equipment, a rotary cutting motor is fixed on the rotary cutting machine frame, and the output end of the rotary cutting motor is connected with a rotary cutter; the rotary cutter frame is in sliding fit with the rotary cutter frame, and the rotary cutter is rotationally connected with the rotary cutter frame; the output end of the feed oil cylinder is connected with one end of a feed ejector rod, and the other end of the feed ejector rod is in contact with the rotary cutting tool rest to drive the rotary cutting tool rest to move.

Preferably, the automatic rotary cutting equipment further comprises a rack driving device and a rack guide rail sliding block, guide rails in the rack driving device and the rack guide rail sliding block are fixed on the rotary cutting worktable, and an output end of the rack driving device and a sliding block in the rack guide rail sliding block are respectively connected with the rotary cutting rack.

Preferably, the necking assembly equipment comprises a necking conveyer belt, a tank body necking device, a seal head prepressing device and a seal head pressing device; the feeding end and the discharging end of the necking conveyer belt are respectively connected with the discharging end of the automatic rotary cutting equipment and the feeding end of the girth welding conveyer belt, and the tank body necking device, the seal head prepressing device and the seal head pressing device are respectively positioned at a tank body necking station, a seal head prepressing station and a seal head pressing station of the necking conveyer belt; the tank necking device comprises a telescopic rotating mechanism and a feed mechanism, and the telescopic rotating mechanisms are arranged oppositely; the telescopic rotating mechanism comprises a telescopic assembly, a rotating assembly and a pressing disc, wherein the output end of the telescopic assembly is connected with the rotating assembly, and the output end of the rotating assembly is connected with the pressing disc; the pressing plate is provided with a positioning plate which protrudes out of the inner side surface of the pressing plate and is used for supporting the tank body and can be sleeved with an inner hole of the tank body; the positioning disc is provided with a necking groove, and the necking groove is radially recessed in the positioning disc; the rotating assembly is used for driving the pressing disc to rotate, and the telescopic assembly is used for driving the positioning disc to extend into the inner hole of the tank body and the inner side surface of the pressing disc to be attached to or far away from the end surface of the tank body; the feed mechanism comprises a feed driving component, a necking tool rest and a necking tool; the output end of the feed driving assembly is connected with the necking tool rest, the necking tool is hinged with the necking tool rest, and the necking tool is embedded with the necking groove; the feed driving assembly is used for driving the necking tool to be close to or far away from the necking part of the end surface of the tank body.

Preferably, the conveying direction of the rotary-cut conveying belt is perpendicular to the conveying direction of the necking conveying belt, the rotary-cut conveying belt conveys the air storage tank longitudinally, and the necking conveying belt conveys the air storage tank transversely. The conveying direction of the necking conveyer belt is perpendicular to the conveying direction of the girth welding conveyer belt, and the girth welding conveyer belt conveys the gas storage tank longitudinally.

The automatic production line for the gas storage tank adopting the technical scheme has the advantages that:

the tank body discharging equipment discharges the whole roll of the fixed-length strip steel, and then the leveling feeding equipment levels the discharged steel plate; the method comprises the following steps that a set hole site is punched on a steel plate through automatic punching equipment, the steel plate is formed into a tank body through longitudinal seam welding equipment, and the longitudinal seams of the tank body are welded after two ends and the middle of the tank body are corrected; the automatic rotary cutting equipment cuts the tank body according to a set length, the necking assembly equipment necks two ends of the tank body and respectively presses two end sockets to the two ends of the tank body; the circular seam automatic welding equipment welds the two seal heads to the tank body, the automatic support welding equipment welds the support, the connecting pipe and the steel plate handle to corresponding positions of the tank body, and the air tightness testing equipment detects the tightness of the assembled air storage tank to complete the production process of the air storage tank. The air storage tank is conveyed to the next station by the conveying belts of the corresponding stations among the plurality of mutually connected devices without manually moving the air storage tank, namely the whole production line is automatically conveyed and processed by the devices; therefore, the labor intensity of workers is reduced, the production efficiency of the gas storage tank is improved, and the automation degree of equipment is also improved.

Drawings

Fig. 1 is a schematic structural view of a conventional gas storage tank production line.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic view of the product structure of the gas storage tank.

Fig. 4 is a schematic view of the product structure of the girth weld line.

Fig. 5 is a schematic product structure diagram of a bracket welding line.

Fig. 6 is a schematic diagram of a product structure of a gas holder test line.

Fig. 7 is a schematic structural view of an automatic rotary cutting apparatus.

Fig. 8 is a schematic structural view of the necking-pair assembling apparatus.

Fig. 9 is a schematic structural view of the tank necking device.

Fig. 10 is a partially enlarged schematic view of the can body necking device.

Fig. 11 is a schematic structural diagram of the head necking equipment.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

An automatic production line for gas storage tanks, as shown in fig. 2 and 4-6, comprises a gas storage tank assembly line 1, a circular seam welding line 2, a bracket welding line 3 and a gas storage tank testing line 4; the assembly line 1 of the gas storage tank comprises a plurality of gas storage tank assembly lines 1, wherein the gas storage tank assembly line 1 comprises tank body discharging equipment 11, leveling and feeding equipment 12, automatic punching equipment 13, longitudinal seam welding equipment 14, automatic rotary cutting equipment 15 and necking assembly equipment 16 which are sequentially arranged along the product conveying direction; the circular seam welding line 2 comprises a plurality of circular seam welding conveyer belts 21 and circular seam automatic welding equipment 22, the feeding ends of the plurality of circular seam conveyer belts 21 are respectively connected with the discharging ends of the necking assembly equipment 16 in the plurality of gas storage tank assembly lines 1, and the plurality of circular seam automatic welding equipment 22 are respectively positioned at different circular seam welding stations on two sides of the circular seam conveyer belts 21; the support welding line 3 comprises a support welding conveyer belt 31 and support automatic welding equipment 32, the feeding end of the support welding conveyer belt 31 is connected with the discharging ends of the plurality of circular seam conveyer belts 21, and the plurality of support automatic welding equipment 32 are respectively positioned at support welding stations at two sides of the support welding conveyer belt 31; the gas storage tank test line 4 includes a plurality of gas tightness test devices 41, and the plurality of gas tightness test devices 41 are respectively located at a plurality of test stations on both sides of the scaffold welding conveyor belt 31. In the mode of producing the gas storage tank, the tank body discharging equipment 11 discharges the whole roll of the fixed-length strip steel, and then the leveling feeding equipment 12 levels the discharged steel plate; the automatic punching equipment 13 punches a set hole site on a steel plate, and the longitudinal seam welding equipment 14 forms the steel plate into a tank body, corrects the two ends and the middle part of the tank body and then welds the longitudinal seam of the tank body; the automatic rotary cutting equipment 15 cuts the tank body according to a set length, the necking assembly equipment 16 necks two ends of the tank body and respectively presses two end sockets to the two ends of the tank body; the automatic circular seam welding equipment 22 welds the two seal heads to the tank body, the automatic support welding equipment 32 welds the support, the connecting pipe and the steel plate handle to corresponding positions of the tank body, and the air tightness testing equipment 41 detects the tightness of the assembled air storage tank to complete the production process of the air storage tank. The air storage tank is conveyed to the next station by the conveying belts of the corresponding stations among the plurality of mutually connected devices without manually moving the air storage tank, namely, the whole production line is automatically conveyed and processed by the devices, so that the labor intensity of workers is reduced; the production efficiency of the gas storage tank is improved, and the automation degree of the equipment is also improved.

Fig. 3 shows a schematic product structure of the air storage tank. The gas storage tank comprises a tank body a, a seal head b, a bracket d, a steel plate handle e and a connecting pipe f; the necking assembly equipment 16 is used for necking openings at two ends of the tank body a to form a tank body necking c, and the opening end of the seal head b is embedded with the tank body necking c and is welded and fixed to the tank body a; the support d, the steel plate handle e and the connecting pipe f are fixedly connected with the tank body a in a welding mode.

As shown in fig. 2, a plurality of the tank assembly lines 1 are arranged in parallel with each other along the product conveying direction. The widths of the plurality of circular seam welding conveyor belts 21 are respectively adapted to the widths of the gas storage tanks of the same specification or different specifications, so that the plurality of circular seam welding conveyor belts 21 can simultaneously process the gas storage tanks of different specifications.

The longitudinal seam welding equipment 14 comprises a longitudinal seam conveyer belt, two-end correcting devices of the tank body, a middle correcting device of the tank body and an automatic longitudinal seam welding device; the feeding end and the discharging end of the longitudinal seam conveyer belt are respectively connected with the discharging end of the automatic punching equipment 13 and the feeding end of the automatic rotary cutting equipment 15, and the correcting ends of the two-end correcting device and the middle correcting device of the tank body are respectively contacted with the opening ends of the two ends of the tank body of the gas storage tank and the middle of the tank body; the welding end of the automatic longitudinal seam welding device is in contact with the longitudinal seam of the tank body. The longitudinal seam conveyer belt is used for conveying the tank body to different stations; the tank body two-end correcting device and the tank body middle correcting device are used for correcting the two ends and the middle part of the tank body; the automatic longitudinal seam welding device is used for welding the longitudinal seam of the tank body.

As shown in fig. 7, the automatic rotary cutting device 15 includes a rotary cutting table, a rotary cutting conveyor belt, a rotary cutting frame 152, a rotary cutting motor 153, a rotary cutting tool holder 154, a rotary cutting tool 155, a tool feeding cylinder 156 and a tool feeding push rod 157; two ends of the rotary cutting conveyer belt are respectively connected with the discharge end of the longitudinal seam welding equipment 14 and the feed end of the necking assembly equipment 16, a rotary cutting motor 153 is fixed on the rotary cutting frame 152, and the output end of the rotary cutting motor is connected with the rotary cutter 155; the rotary cutter frame 154 is in sliding fit with the rotary cutter frame 152, and the rotary cutter 155 is rotationally connected with the rotary cutter frame 154; the output end of the feed cylinder 156 is connected with one end of the feed push rod 157, and the other end of the feed push rod 157 contacts with the rotary cutter frame 154 to drive the rotary cutter frame 154 to move. When in work: the rotary cutting conveyer belt receives the tank body to a cutting station; the rotary cutting motor 153 drives the rotary cutter 155 to rotate around the rotary cutter holder 154, and the feed cylinder 156 drives the feed push rod 157 to move so as to drive the rotary cutter 155 to move downwards for feeding to cut off the can body.

The automatic rotary cutting apparatus 15 further includes a frame driving device 158 and a frame rail slider 159, the rails of the frame driving device 158 and the frame rail slider 159 are fixed on the rotary cutting worktable, and the output end of the frame driving device 158 and the slider of the frame rail slider 159 are respectively connected to the rotary cutting frame 152. The rack driving device 158 drives the rotary cutter rack 152 to move to different positions and further drives the rotary cutter 155 to move to different positions to cut off the tank bodies from different lengths, so that the equipment can produce gas storage tanks with various lengths.

As shown in fig. 8-10, the necking assembly device 16 comprises a necking conveyer belt 60, a tank body necking device 61, a head prepressing device 62 and a head pressing device 63; the feeding end and the discharging end of the necking conveyer belt 60 are respectively connected with the discharging end of the automatic rotary cutting equipment 15 and the feeding end of the girth welding conveyer belt 21, and the tank body necking device 61, the seal head prepressing device 62 and the seal head pressing device 63 are respectively positioned at a tank body necking station, a seal head prepressing station and a seal head pressing station of the necking conveyer belt 60; the tank body necking device 61 comprises a telescopic rotating mechanism 611 and a feed mechanism 612, wherein the telescopic rotating mechanisms 611 are arranged oppositely; the telescopic rotating mechanism 611 comprises a telescopic assembly 613, a rotating assembly 614 and a pressing disc 615, wherein the output end of the telescopic assembly 613 is connected with the rotating assembly 614, and the output end of the rotating assembly 614 is connected with the pressing disc 615; the pressing plate 615 is provided with a positioning plate 616 which protrudes out of the inner side surface of the pressing plate 615 and is used for supporting the tank body and can be sleeved with an inner hole of the tank body; the positioning disk 616 is provided with a necking groove 617, and the necking groove 617 is radially recessed in the positioning disk 616; the rotating assembly 614 is used for driving the pressing disc 615 to rotate, and the telescopic assembly 613 is used for driving the positioning disc 616 to extend into the inner hole of the tank body and the inner side surface of the pressing disc 615 to be attached to or far away from the end surface of the tank body; the feed mechanism 612 includes a feed drive assembly 618, a necking tool holder 619, and a necking tool 610; the output end of the feed driving component 618 is connected with the necking tool post 619, the necking tool 610 is hinged with the necking tool post 619, and the necking tool 610 is embedded with the necking groove 617; the feed drive assembly 618 is used to drive the necking knife 610 toward or away from the necking portion of the can end face. When in work: 1) the necking conveyer belt 60 drives the tank body to move to a tank body necking station; 2) the telescopic assemblies 613 in the telescopic rotating mechanisms 611 on the two sides of the tank body respectively drive the positioning discs 616 to extend into the inner holes on the two ends of the tank body, and drive the side surfaces of the pressing discs 615 to be attached to the two end surfaces of the tank body so as to clamp the tank body; 3) the rotating component 614 drives the pressing disc 615 to rotate so as to drive the tank body to rotate, and the feed driving component 618 drives the necking tool 610 to be close to the end face of the tank body and to be embedded with the necking groove 617 to perform necking on the necking part of the tank body; 4) the head pre-pressing device 62 pre-presses the two heads to the two ends of the tank body, and the head pressing device 63 presses the heads to the two ends of the tank body to complete the tank body necking and head assembling processes. In the mode, the tank body is subjected to necking instead of the end socket; as shown in fig. 11, the head necking apparatus includes a rotary driving device 71, a head positioning device 72, a head compressing device 73 and a head necking tool 74, wherein an output end of the rotary driving device 71 is connected with the head positioning device 72, and the head positioning device 72 is used for supporting a head in a sleeving manner; the end socket pressing device 73 comprises an end socket pressing cylinder 731 and an end socket pressing head 732, and the output end of the end socket pressing cylinder 731 is hinged with the end socket pressing head 732; when the end socket is contracted: placing the seal head opening downwards and positioning the seal head lower end opening by a seal head positioning device 72; the end socket pressing cylinder 731 drives the end socket pressing head 732 to move downwards to press the upper end of the end socket; the rotary driving device 71 drives the end socket positioning device 72 to rotate so as to drive the end socket to rotate, and the end socket necking tool 74 is close to the end socket to perform necking on the end socket to complete the end socket necking process. In this way, the end socket positioning device 72 provides positioning support for the upper part of the end socket necking part and does not provide support for the inner side of the end socket necking part; when the end socket necking tool 74 extrudes and necks the end socket necking part, the end socket necking part is deformed due to the fact that only one-side force is applied to the end socket necking part, and therefore roundness of the end socket after necking is low. In the necking mode of the can body, the necking tool 610 is close to the end surface of the can body and is embedded with the necking groove 617 when necking the necking part of the can body, namely the necking part of the can body is supported and limited by the outer surface of the necking groove 617; thereby avoiding the condition that the tank body necking part is stressed on one side and improving the roundness of the tank body necking part.

The conveying direction of the rotary-cut conveying belt is perpendicular to the conveying direction of the necking conveying belt 60, the rotary-cut conveying belt conveys the air storage tank longitudinally, and the necking conveying belt 60 conveys the air storage tank transversely. The conveying direction of the necking conveyer belt 60 is perpendicular to the conveying direction of the circular seam welding conveyer belt 21, and the circular seam welding conveyer belt 21 conveys the gas storage tank longitudinally so as to realize conveying of the tank body at different angles and facilitate processing.

When the gas holder automated production is produced: 1) feeding the whole coil of the fixed-length strip steel to tank body discharging equipment 11, and discharging the whole coil of the fixed-length strip steel by the tank body discharging equipment 11; 2) the leveling feeding equipment 12 levels the discharged steel plate and then automatically feeds the steel plate to the automatic punching equipment 13, the automatic punching equipment 13 automatically punches a hole in the steel plate, and then the steel plate with the punched hole is sent to longitudinal seam welding equipment 14; 3) the longitudinal seam welding equipment 14 bends and forms the steel plate, and the two ends of the tank body and the middle part of the tank body are respectively corrected by the two ends correcting device and the middle correcting device of the tank body; then the longitudinal seam automatic welding device welds the longitudinal seam of the tank body and conveys the tank body to the automatic rotary cutting equipment 15; 4) the rack driving device 158 drives the rotary cutter 155 to move to a set position according to the set length of the can body, and the feed oil cylinder 156 drives the feed ejector rod 157 to drive the rotary cutter 155 to feed so as to cut off the can body; 5) the necking conveyer belt 60 receives the tank body, and the tank body necking device 61 performs necking treatment on two ends of the tank body; after the two seal heads are respectively pre-pressed to the two sides of the tank body by the seal head pre-pressing device 62, the two seal heads are tightly pressed into the tank body by the seal head pressing device 63; 6) the circular seam welding conveyer belt 21 receives the tank body and the end enclosure assembly, and the automatic circular seam welding equipment 22 welds and fixes the end enclosures to the two ends of the tank body and then conveys the end enclosures to the support welding line 3; 7) after the gas storage tank is received by the support welding conveying belt 31, the automatic support welding equipment 32 respectively welds the support, the connecting pipe and the steel plate handle to corresponding positions of the tank body and forwards conveys the tank body to a position of a gas storage tank test line 4; 8) the plurality of air tightness testing devices 41 respectively perform tightness tests on the assembled air storage tanks and collect qualified air storage tanks to complete the automatic production process of the air storage tanks.

Claims

1. An automatic production line for a gas storage tank is characterized by comprising a gas storage tank assembly line (1), a circular seam welding line (2), a support welding line (3) and a gas storage tank test line (4); the assembly line (1) of the gas storage tank comprises a plurality of tank body discharging devices (11), a leveling and feeding device (12), an automatic punching device (13), a longitudinal seam welding device (14), an automatic rotary cutting device (15) and a necking assembly device (16), wherein the tank body discharging devices (11), the leveling and feeding device, the automatic punching device (13), the longitudinal seam welding device and the necking assembly device are arranged along the product conveying direction; the circular seam welding line (2) comprises a plurality of circular seam welding conveyer belts (21) and automatic circular seam welding equipment (22), the feeding ends of the circular seam welding conveyer belts (21) are respectively connected with the discharging ends of the necking assembly equipment (16) in the gas storage tank assembly line (1), and the automatic circular seam welding equipment (22) are respectively positioned at different circular seam welding stations on two sides of the circular seam welding conveyer belts (21); the support welding line (3) comprises a support welding conveyer belt (31) and automatic support welding equipment (32), the feeding end of the support welding conveyer belt (31) is connected with the discharging ends of the plurality of girth welding conveyer belts (21), and the plurality of automatic support welding equipment (32) are respectively positioned at support welding stations on two sides of the support welding conveyer belt (31); the gas storage tank test line (4) comprises a plurality of gas tightness test devices (41), and the gas tightness test devices (41) are respectively located at a plurality of test stations on two sides of the support welding conveying belt (31).

2. An automatic production line for gas storage tanks, as claimed in claim 1, characterized in that a plurality of gas storage tank assembly lines (1) are distributed parallel to each other along the product conveying direction.

3. An automatic production line for gas storage tanks according to claim 1, characterized in that the widths of the plurality of girth welding conveyor belts (21) are respectively adapted to the widths of gas storage tanks of the same specification or different specifications.

4. The automatic production line of the gas storage tank as claimed in claim 1, wherein the longitudinal seam welding equipment (14) comprises a longitudinal seam conveyer belt, two end correcting devices of the tank body, a middle correcting device of the tank body and an automatic longitudinal seam welding device; the feeding end and the discharging end of the longitudinal seam conveying belt are respectively connected with the discharging end of an automatic punching device (13) and the feeding end of an automatic rotary cutting device (15), and the correcting ends of the two-end correcting device and the middle correcting device of the tank body are respectively contacted with the opening ends of the two ends of the tank body of the gas storage tank and the middle of the tank body; the welding end of the automatic longitudinal seam welding device is in contact with the longitudinal seam of the tank body.

5. The automatic production line of the air storage tank as claimed in claim 1, wherein the automatic rotary cutting device (15) comprises a rotary cutting workbench, a rotary cutting conveyer belt, a rotary cutting frame (152), a rotary cutting motor (153), a rotary cutting tool holder (154), a rotary cutting tool (155), a tool feeding cylinder (156) and a tool feeding ejector rod (157); two ends of the rotary cutting conveyer belt are respectively connected with the discharge end of the longitudinal seam welding equipment (14) and the feed end of the necking assembly equipment (16), a rotary cutting motor (153) is fixed on the rotary cutting rack (152), and the output end of the rotary cutting motor is connected with a rotary cutter (155); the rotary cutter frame (154) is in sliding fit with the rotary cutter frame (152), and the rotary cutter (155) is rotationally connected with the rotary cutter frame (154); the output end of the feed oil cylinder (156) is connected with one end of a feed ejector rod (157), and the other end of the feed ejector rod (157) is contacted with the rotary cutting tool holder (154) to drive the rotary cutting tool holder (154) to move.

6. The automatic production line of air storage tanks of claim 5, wherein the automatic rotary cutting device (15) further comprises a rack driving device (158) and a rack guide rail slider (159), the guide rails of the rack driving device (158) and the rack guide rail slider (159) are fixed on the rotary cutting worktable, and the output end of the rack driving device (158) and the slider of the rack guide rail slider (159) are respectively connected with the rotary cutting rack (152).

7. The automatic production line of the gas storage tank as claimed in claim 1, wherein the necking assembly equipment (16) comprises a necking conveyer belt (60), a tank body necking device (61), a head prepressing device (62) and a head pressing device (63); the feeding end and the discharging end of the necking conveyer belt (60) are respectively connected with the discharging end of the automatic rotary cutting equipment (15) and the feeding end of the girth welding conveyer belt (21), and the tank body necking device (61), the seal head prepressing device (62) and the seal head pressing device (63) are respectively positioned at a tank body necking station, a seal head prepressing station and a seal head pressing station of the necking conveyer belt (60); the tank body necking device (61) comprises a telescopic rotating mechanism (611) and a feed mechanism (612), and the telescopic rotating mechanisms (611) are arranged oppositely; the telescopic rotating mechanism (611) comprises a telescopic assembly (613), a rotating assembly (614) and a pressing disc (615), wherein the output end of the telescopic assembly (613) is connected with the rotating assembly (614), and the output end of the rotating assembly (614) is connected with the pressing disc (615); the pressing disc (615) is provided with a positioning disc (616) which protrudes out of the inner side surface of the pressing disc (615) and is used for supporting the tank body and can be sleeved with an inner hole of the tank body; the positioning plate (616) is provided with a necking groove (617), and the necking groove (617) is radially recessed in the positioning plate (616); the rotating assembly (614) is used for driving the pressing disc (615) to rotate, and the telescopic assembly (613) is used for driving the positioning disc (616) to extend into the inner hole of the tank body and the inner side surface of the pressing disc (615) to be attached to or far away from the end surface of the tank body; the feed mechanism (612) comprises a feed driving component (618), a necking tool holder (619) and a necking tool (610); the output end of the feed driving component (618) is connected with the necking tool rest (619), the necking tool (610) is hinged with the necking tool rest (619), and the necking tool (610) is embedded with the necking groove (617); the feed drive assembly (618) is used for driving the necking knife (610) to be close to or far away from the necking part of the end surface of the tank body.

8. The automatic production line of air storage tanks according to claim 5 or 7, characterized in that the conveying direction of the rotary cut conveyer belt is perpendicular to the conveying direction of the necking conveyer belt (60), and the rotary cut conveyer belt conveys the air storage tanks longitudinally and the necking conveyer belt (60) conveys the air storage tanks transversely.

9. An automatic production line for gas storage tanks according to claim 7, characterized in that the conveying direction of the necking conveyor (60) is perpendicular to the conveying direction of the girth welding conveyor (21), and the girth welding conveyor (21) conveys the gas storage tanks longitudinally.