An integrated welding system and method for large storage tank vault beams
The integrated assembly welding system for large storage tank vault beams addresses deformation and low efficiency issues by using an automated platform with precise clamping and welding, enhancing accuracy and efficiency while reducing labor needs.
Patent Information
- Application Number
- CN202010622581.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-06-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-06-30
AI Technical Summary
The assembly and welding of large storage tank vault beams face challenges such as deformation, low efficiency, and poor weld quality due to manual operations and lack of professional assembly platforms, leading to reduced construction efficiency and accuracy.
An integrated assembly welding system with an assembly platform, automatic welding device, and PLC controller, featuring clamping plates and driving devices for precise positioning and welding, along with displacement sensors and electromagnetic adsorption, to ensure high accuracy and efficiency.
Improves assembly and welding accuracy, reduces labor requirements, enhances first-time pass rate, and increases production efficiency by integrating assembly and welding processes, ensuring high-quality welds and adaptability to different beam sizes.
Smart Images
Figure CN112008310B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of storage tank welding, and in particular to an integrated assembly welding system and method for a large storage tank vault beam. Background Art
[0002] The arch beams of large storage tanks are mostly "H" steel curved structures, which are generally made by self-cutting and manual welding. At present, there is no professional assembly platform. Due to the thickness of the plate itself, deformation is very easy to occur during the assembly and welding of the arch beams, and the deformation is complex and diverse, making it difficult to correct the shape later. At the same time, the efficiency of welding the arch beams of large storage tanks by manual welding is relatively low, and the welding quality cannot be effectively guaranteed.
[0003] The assembly, welding deformation and weld quality problems of the vault beams of large storage tanks seriously affect the on-time delivery of products. The traditional method of assembly and welding deformation prevention of vault beams of large storage tanks is mainly to limit and fix the plates through ground molds, adjust the welding process for control, and correct the deformed position of the vault beams again after welding. When the above traditional process is used, it is often necessary to make ground molds of different specifications according to the vault beam structures of different specifications, which will occupy the construction site and waste a lot of construction auxiliary materials and human resources; at the same time, the production accuracy and production efficiency of the vault beams are also relatively low, which seriously affects the construction cycle of the product. In addition, the welding construction of the vault beams of large storage tanks currently relies mostly on manual work, with a low degree of automation and low assembly and welding accuracy, which greatly reduces the construction efficiency and finished products. Summary of the invention
[0004] The purpose of the present invention is to provide a large-scale storage tank vault beam integrated welding system and method with high assembly accuracy and high welding efficiency in view of the differences in the prior art.
[0005] The technical solution adopted by the present invention is: an integrated assembly welding system for the vault beam of a large storage tank, including an assembly platform, an automatic welding device and a control cabinet with a built-in PLC controller, the assembly platform is composed of a plurality of platform units spliced in sequence, each platform unit includes a platform base and a plurality of cardboard assemblies for fixing the inner and outer flange plates of the vault beam, and each cardboard assembly is arranged at intervals along the length direction of the platform base; each group of cardboard assemblies is equipped with a driving device; the driving device of the assembly platform is connected to the PLC controller; the automatic welding device can move along the upper edge of the inner and outer flange plates of the vault beam fixed to the cardboard assembly, and the automatic welding device is connected to the PLC controller; the PLC controller controls the action of the driving device to move the cardboard assembly to a set position so that the cardboard assembly clamps the inner and outer flange plates of the vault beam; and starts the automatic welding device to realize the welding of the web plate of the vault beam and the inner and outer flange plates.
[0006] According to the above scheme, the clamping plate assembly includes a sliding shaft, and a first clamping plate and a second clamping plate arranged opposite to each other. The upper part of the first clamping plate passes through the mounting groove opened on the platform base, and is arranged on the platform base through the first sliding angle supports on both sides; the mounting grooves are arranged at intervals along the width direction of the platform base, and the length direction of the mounting grooves is consistent with the axial direction of the sliding shaft; the bottom of the first clamping plate is arranged on the first seat body, and the first seat body is connected to the sliding shaft; the upper part of the second clamping plate passes through the mounting groove, and is arranged on the platform base through the second sliding angle supports on both sides. It is arranged on the platform base; the bottom of the second clamping plate is arranged on the second seat body, and the sliding shaft passes through the second seat body; the first seat body and the second seat body are respectively connected to the driving device, and the driving device drives the second clamping plate and the second clamping plate to move axially along the sliding shaft, so that the first clamping plate and the second clamping plate are moved to the set position, and the connecting line of each set position of the first clamping plate is matched with the contour line of the inner flange plate of the arch beam, and the connecting line of each set position of the second clamping plate is matched with the contour line of the outer flange plate of the arch beam, and the spacing between the first clamping plate and the second clamping plate is matched with the width of the arch beam.
[0007] According to the above scheme, the driving device includes a multi-stage hydraulic driving mechanism and a pneumatic push rod mechanism installed on the lower surface of the platform base, the driving end of the multi-stage hydraulic driving mechanism is hinged to the first connecting ear plate A provided on the first seat body, the pneumatic push rod mechanism is connected to the first connecting ear plate B provided on the first seat body, and the driving end of the pneumatic push rod mechanism is hinged to the second connecting ear plate provided on the second seat body; the driving direction of the multi-stage hydraulic driving mechanism and the driving direction of the pneumatic push rod mechanism are parallel to the axial direction of the sliding shaft.
[0008] According to the above scheme, displacement sensors are respectively arranged on the first base body and the second base body, and the displacement sensors are used to detect the displacement information of the first card plate or the second card plate, and send the displacement information to the PLC controller.
[0009] According to the above solution, the first seat body is an electromagnetic adsorption seat connected to the PLC controller.
[0010] According to the above scheme, four legs are arranged at the bottom of the platform base; and an operation hole for back welding is opened on the platform base.
[0011] According to the above scheme, the automatic welding device includes an automatic welding trolley, a welding wire drum, a wire feeding mechanism and a welding gun head. The bottom of the automatic welding trolley is equipped with two left and right groups of walking wheels. The spacing between the two groups of walking wheels is consistent with the width of the arch beam, and the walking wheels can move along the upper edge of the inner and outer flange plates of the arch beam; the welding wire drum, the wire feeding mechanism and the welding gun head are arranged in two groups, which are respectively arranged on both sides of the automatic welding trolley, and the two groups of wire feeding mechanisms are respectively connected to the protective gas pipeline; the welding wire is wound on the welding wire drum, and the welding wire head is led out from the welding wire drum and introduced into the welding gun head through the wire feeding mechanism; a weld recognition sensor is installed on the welding gun head, and the weld recognition sensor is connected to the PLC controller for automatic positioning, tracking and identification of the weld.
[0012] According to the above scheme, the wire feeding mechanism includes a closed cover body connected to the shielding gas pipeline, and an upper roller and a lower roller arranged inside the cover body; the welding wire passes through the gap between the upper and lower rollers, and the wire feeding is achieved by rotating the upper and lower rollers; the shielding gas is introduced into the welding gun head through the wire feeding mechanism.
[0013] The present invention also provides a large-scale storage tank vault beam integrated assembly welding method, the method comprising the following steps:
[0014] Step 1: Provide the components of the welding system as described above, and install and debug them;
[0015] Step 2, the PLC controller designs the setting positions of the first and second clamps in each clamp assembly on the platform base according to the relevant specification parameters of the vault beam, the connecting line of each first clamp setting position is adapted to the contour line of the inner flange plate of the vault beam, the connecting line of each second clamp setting position is adapted to the contour line of the outer flange plate of the vault beam, and the spacing between the first clamp and the second clamp is adapted to the width of the vault beam;
[0016] Step 3: The PLC controller receives the displacement information of each displacement sensor, and controls the driving device to move the first and second clamping plates into position in combination with the set positions of the first and second clamping plates in each clamping plate assembly; and supports the plate on the platform base between the first and second clamping plates;
[0017] Step 4: hoist the inner and outer flange plates and the web plate of the arch beam onto the assembly platform, clamp the inner and outer flange plates with the first clamping plate and the second clamping plate, and place the upper support plate on the web plate;
[0018] Step 5: After the vault beam is clamped and assembled, the upper and lower parts of the vault beam are welded using an automatic welding device.
[0019] The beneficial effects of the present invention are:
[0020] 1. The present invention designs an assembly platform and an automatic welding device, and uses a PLC controller to control the operation of each device to realize the integration of assembly and welding of the vault beam. Compared with the manual operation in the prior art, the assembly and welding accuracy is improved, the welding quality is guaranteed, the first-time pass rate of the curvature inspection of the vault beam after welding is improved, the manufacturing difficulty of the vault beam assembly and welding is reduced, the construction efficiency is improved, and a large amount of human resources are saved at the same time;
[0021] 2. Each pallet in the assembly platform is equipped with a displacement sensor, which feeds back the displacement information of each pallet to the PLC controller in real time and is driven by an independent multi-stage hydraulic drive device to achieve high-precision automatic adjustment of the position of each pallet, reducing the need for auxiliary operators and saving labor costs;
[0022] 3. The clamping plate assembly is designed with an electromagnetic adsorption seat. After the first clamping plate moves to the set position, the electromagnetic adsorption seat is used to adsorb the first clamping plate on the lower surface of the platform base, thereby reducing the displacement caused by the collision and impact of the inner and outer flange plates and web plates of the vault beam during the lifting and placement process, thereby ensuring the curvature dimensional accuracy during the assembly of the vault beam;
[0023] 4. An operation hole for back welding of the vault beam is provided between two adjacent mounting grooves on the platform base, so that the front and back sides of the vault beam can be welded simultaneously, which greatly improves the production efficiency;
[0024] 5. The platform assembly is composed of a plurality of platform units. This modular design allows the selection of a suitable number of platform units according to the length of the specific vault beam, and the splicing of the platform base. On the one hand, it can be used for vault beams of different sizes, with strong versatility and flexibility; on the other hand, this spliced structure can meet the production needs of different sites and has strong adaptability to the working environment;
[0025] 6. The automatic welding device is provided with two welding gun heads and is also equipped with a tracking and identification sensor with a tracking and identification function. The two welding guns are synchronously and automatically positioned, tracked and identified for welding, which improves welding efficiency and effectively guarantees the first-time welding pass rate of the weld. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.
[0027] Figure 2 It is a partial enlarged view of the vault beam installed on the welding system.
[0028] Figure 3 The structure of the assembly platform in this embodiment is shown in FIG. Figure 1 .
[0029] Figure 4The structure of the assembly platform in this embodiment is shown in FIG. Figure 2 .
[0030] Figure 5 Schematic diagram of the connection between the driving device and the card assembly in this embodiment.
[0031] Figure 6 Schematic diagram of the structure of the first card board in this embodiment.
[0032] Figure 7 Schematic diagram of the connection of the second card board in this embodiment.
[0033] Figure 8 Schematic diagram of the structure of the automatic welding device in this embodiment.
[0034] Among them: 1. Assembly platform; 1.1. Platform base; 1.2. Mounting slot; 1.3. Operation hole; 1.4. Leg; 1.5. Lower support plate; 1.6. First clamping plate; 1.7. First seat body; 1.8. Sliding shaft; 1.9. First sliding angle support; 1.10. First connecting ear plate A; 1.11. First connecting ear plate B; 1.12. Second clamping plate; 1.13. Second seat body; 1.14. Second sliding angle support; 1.15. Second connecting ear plate; 1.16, multi-stage hydraulic drive mechanism; 1.17, pneumatic push rod mechanism; 1.18, upper support plate; 1.19, slide; 2, arch beam; 2.1, inner flange plate; 2.2, outer flange plate; 2.3, web plate; 2.4, inner arc curve; 3, automatic welding device; 3.1, automatic welding trolley; 3.2, walking wheel; 3.3, welding wire drum; 3.4, welding wire; 3.5, wire feeding mechanism; 3.6, shielding gas pipeline; 3.7, welding gun head; 4, control cabinet. DETAILED DESCRIPTION
[0035] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.
[0036] The tank vault beam 2 is mostly an "H" steel curved structure, which includes a web 2.3 and inner and outer flange plates arranged on both sides of the web 2.3; the web 2.3 and the two flange plates are cut from steel plates and finally welded together to form the vault beam 2. Figure 1The invention discloses an integrated welding system for a vault beam 2 of a large storage tank, comprising a platform 1, an automatic welding device 3 and a control cabinet 4 with a built-in PLC controller as described above, wherein the platform 1 is formed by sequentially splicing a plurality of platform units, each of which comprises a platform base 1.1 and a plurality of cardboard assemblies for fixing the inner and outer flange plates of the vault beam 2, and each cardboard assembly is arranged at intervals along the length direction of the platform base 1.1; each group of cardboard assemblies is equipped with a driving device, and the driving device is connected to the PLC controller; the automatic welding device 3 moves along the upper edge of the inner and outer flange plates of the vault beam 2 fixed to the cardboard assembly, and the automatic welding device 3 is connected to the PLC controller; the PLC controller controls the action of the driving device to move the cardboard assembly to a set position and clamp the inner and outer flange plates of the vault beam 2, and starts the automatic welding device 3 after the web 2.3 is installed, so as to realize the welding of the web 2.3 of the vault beam 2 with the inner and outer flange plates. In the present invention, the set position of each cardboard assembly on the platform base 1.1 is determined by the length and curvature of the vault beam 2.
[0037] Preferably, the card assembly includes a sliding shaft 1.8, and a first card 1.6 and a second card 1.12 arranged opposite to each other. The upper part of the first card 1.6 passes through the mounting groove 1.2 opened on the platform base 1.1, and is arranged on the platform base 1.1 through the first sliding angle supports 1.9 on both sides (a slide 1.19 is provided at the bottom of the first sliding angle support 1.9, and the slide 1.19 is in contact with the upper surface of the platform base 1.1; the slide 1.19 is made of polytetrafluoroethylene material, which is wear-resistant and lubricating); the mounting grooves 1.2 are arranged at intervals along the width direction of the platform base 1.1 and the length direction of the mounting grooves 1.2 is consistent with the axial direction of the sliding shaft 1.8; the bottom of the first card 1.6 is provided on the first seat body 1.7, and the first seat body 1.7 is connected to the sliding shaft 1.8; the upper part of the second card 1.12 passes through the mounting groove 1. 2, the second sliding angle supports 1.14 on both sides are arranged on the platform base 1.1; the bottom of the second clamping plate 1.12 is arranged on the second seat body 1.13, and the sliding shaft 1.8 passes through the second seat body 1.13; the first seat body 1.7 and the second seat body 1.13 are respectively connected to the driving device, and the driving device drives the second clamping plate 1.12 and the second clamping plate 1.12 to move axially along the sliding shaft 1.8, so that the first clamping plate 1.6 and the second clamping plate 1.12 move to the set position, the connecting line of each set position of the first clamping plate 1.6 is matched with the contour line of the inner flange plate 2.1 of the arch beam 2 (that is, the inner arc curve 2.4 of the arch beam 2), the connecting line of each set position of the second clamping plate 1.12 is matched with the contour line of the outer flange plate 2.2 of the arch beam 2, and the spacing between the first clamping plate 1.6 and the second clamping plate 1.12 is matched with the width of the arch beam 2.
[0038] Preferably, the driving device includes a multi-stage hydraulic driving mechanism 1.16 and a pneumatic push rod mechanism 1.17 installed on the lower surface of the platform base 1.1, the driving end of the multi-stage hydraulic driving mechanism 1.16 is hinged to the first connecting ear plate A1.10 provided on the first seat body 1.7, the pneumatic push rod mechanism 1.17 is connected to the first connecting ear plate B1.11 provided on the first seat body 1.7, and the driving end of the pneumatic push rod mechanism 1.17 is hinged to the second connecting ear plate 1.15 provided on the second seat body 1.13; the driving direction of the multi-stage hydraulic driving mechanism 1.16 and the driving direction of the pneumatic push rod mechanism 1.17 are parallel to the axial direction of the sliding shaft 1.8. In this embodiment, the multi-stage hydraulic drive mechanism 1.16 drives the first clamping plate 1.6 and the second clamping plate 1.12 to move along the length direction of the installation groove 1.2 to move the first clamping plate 1.6 to a set position; then the pneumatic push rod mechanism 1.17 is started to move the second clamping plate 1.12 to the set position.
[0039] Preferably, displacement sensors are respectively arranged on the first seat body 1.7 and the second seat body 1.13, and the displacement sensors are used to detect the displacement information of the first clamping plate 1.6 or the second clamping plate 1.12, and send the displacement information to the PLC controller. The PLC controller receives the displacement information and compares it with the set position of the corresponding clamping plate, calculates the stroke of the driving device, controls the action of the driving device, and finally moves the first clamping plate 1.6 and the second clamping plate 1.12 to the set position.
[0040] Preferably, the first seat body 1.7 is an electromagnetic adsorption seat connected to a PLC controller. When the first clamping plate 1.6 moves to a set position, the PLC controller controls the electromagnetic adsorption seat to be electrically adsorbed on the lower surface of the platform base 1.1, and the first clamping plate 1.6 is fixed accordingly.
[0041] Preferably, four legs 1.4 are provided at the bottom of the platform base 1.1; an operation hole 1.3 for back welding is opened on the platform base 1.1, and the size of the operation hole 1.3 is based on covering the section of the arch beam 2 with the largest area and ensuring the strength of the platform base 1.1.
[0042] Preferably, the automatic welding device 3 comprises an automatic welding trolley 3.1, a welding wire drum 3.3, a wire feeding mechanism 3.5 and a welding gun head 3.7. The bottom of the automatic welding trolley 3.1 is provided with two groups of left and right walking wheels 3.2. The spacing between the two groups of walking wheels 3.2 is consistent with the width of the arch beam 2. The walking wheels 3.2 can walk along the upper edges of the inner and outer flange plates of the arch beam 2; the welding wire drum 3.3, the wire feeding mechanism 3.5 and the welding gun head 3.7 are arranged in two groups, which are respectively arranged on both sides of the automatic welding trolley 3.1, and the two groups of wire feeding mechanisms 3.5 are respectively connected to the shielding gas pipeline 3.6; the welding wire 3.4 is wound on the welding wire drum 3.3, and the head of the welding wire 3.4 is led out from the welding wire drum 3.3 and introduced into the welding gun head 3.7 through the wire feeding mechanism 3.5; a weld seam recognition sensor is installed on the welding gun head 3.7, and the weld seam recognition sensor is connected to the PLC controller for automatic positioning, tracking and recognition of the weld seam.
[0043] In this embodiment, the wire feeding mechanism 3.5 includes a closed cover body connected to the shielding gas pipeline 3.6, an upper roller and a lower roller arranged inside the cover body; the welding wire 3.4 passes through the gap between the upper and lower rollers, and the wire feeding is achieved by the rotation of the upper and lower rollers; the shielding gas is introduced into the welding gun head 3.7 through the wire feeding mechanism 3.5. In this embodiment, the wire feeding mechanism 3.5 is a prior art and will not be described here. The automatic welding device 3 is a gas shielded welding; the design of the two welding gun heads 3.7 can realize the synchronous automatic positioning, tracking and identification welding on both sides of the web 2.3.
[0044] The present invention also provides an integrated assembly welding method for a large storage tank vault beam 2, which mainly includes four parts: construction and debugging of the assembly welding system, setting of specification parameters of the vault beam 2 and position setting of the pallet assembly, clamping and assembling of the vault beam 2, and welding of the vault beam 2. After the assembly welding system is debugged, the components of the vault beam 2 are auxiliary assembled and clamped, and the automatic welding device 3 performs dual-gun synchronous automatic tracking and identification welding. The curvature of the pallet structure and the positions of the first pallet 1.6 and the second pallet 1.12 are set by the PLC controller according to the specification parameters of the vault beam 2. The number of support plates corresponds to the number of pallets in each group, and the clamping operation of each position of each component of the vault beam 2 can be controlled by one person. An integrated assembly welding method for a large storage tank vault beam 2 specifically includes the following steps:
[0045] Step 1: Provide the components of the welding system as described above, and install and debug them.
[0046] Before welding the two groups of arch beams, select a suitable number of platform units according to the length of the arch beam 2 and assemble them in sequence; then connect and debug each platform unit with the PLC controller and the drive device to ensure the displacement accuracy of the pallet assembly in each platform unit.
[0047] Step 2: The PLC controller designs the positions of the first clamping plate 1.6 and the second clamping plate 1.12 in each clamping plate assembly according to the relevant specification parameters of the arch beam 2.
[0048] Input relevant specification parameters of the vault beam 2 such as the length and width of the vault beam 2, the curvature of the vault beam 2, etc. into the PLC controller. The PLC controller designs the setting positions of the first clamping plate 1.6 and the second clamping plate 1.12 in each clamping plate assembly according to the relevant specification parameters of the vault beam 2, and the spacing between the first clamping plate 1.6 and the second clamping plate 1.12, so that the connecting line of the setting position of each first clamping plate 1.6 is adapted to the contour line of the inner flange plate 2.1 of the vault beam 2, the connecting line of the setting position of each second clamping plate 1.12 is adapted to the contour line of the outer flange plate 2.2 of the vault beam 2, and the spacing between the first clamping plate 1.6 and the second clamping plate 1.12 is adapted to the width of the vault beam 2.
[0049] Step 3: The PLC controller receives the displacement information of each displacement sensor, and calculates the driving displacement of each driving device in combination with the set positions of the first card plate 1.6 and the second card plate 1.12 in each card plate assembly, and controls the driving device to move the first card plate 1.6 and the second card plate 1.12 into position; and places the lower support plate 1.5 on the platform base 1.1 between the first card plate 1.6 and the second clamping plate. Specifically, each multi-stage hydraulic driving mechanism 1.16 drives the first card plate 1.6 to the corresponding set position, and controls the electromagnetic adsorption device to start, adsorbing the platform base 1.1 to fix the first card plate 1.6; the pneumatic push rod mechanism 1.17 pushes the second card plate 1.12 to the corresponding set position; and places the lower support plate 1.5 on the platform base 1.1 between the first card plate 1.6 and the second card plate 1.12.
[0050] Step 4: hoist the inner and outer flange plates and web plate 2.3 of the vault beam 2 onto the assembly platform 1, clamp the inner and outer flange plates with the first clamp plate 1.6 and the second clamp plate 1.12, and place the upper support plate 1.18 on the web plate 2.3. Specifically, place the inner flange plate 2.1 of the vault beam 2 at the set position of each first clamp plate 1.6, place the web plate 2.3 of the vault beam 2 on each lower support plate 1.5, place the outer flange plate 2.2 of the vault beam 2 at the set position of the second clamp plate 1.12, and place the upper support plate 1.18 on the web plate 2.3; sequentially adjust the pneumatic push rod mechanism 1.17 corresponding to each group of clamp plate assemblies, so that the first clamp plate 1.6 and the second clamp plate 1.12 clamp the inner and outer flange plates of the vault beam 2.
[0051] Step 5: Automated welding of the vault beam 2. After the vault beam 2 is clamped and assembled, the automatic welding device 3 is controlled by a welder to perform intermittent automatic jump welding with two guns. The automatic welding device 3 is a gas shielded welding device, and the welding gun has a tracking and identification function. The two welding guns can realize synchronous automatic positioning, tracking and identification welding. After the intermittent welding is completed, the support plate position is adjusted, and two welds are synchronously welded again at the shielded position. After the upper part of the vault beam 2 is welded, it is turned over and clamped, assembled and welded using the same process.
[0052] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for integrated welding of a large storage tank vault beam, characterized in that: The method comprises the following steps: Step 1: Provide various components of the welding system, and install and debug them; Step 2, the PLC controller designs the setting positions of the first and second clamps in each clamp assembly on the platform base according to the relevant specification parameters of the vault beam, the connecting line of each first clamp setting position is adapted to the contour line of the inner flange plate of the vault beam, the connecting line of each second clamp setting position is adapted to the contour line of the outer flange plate of the vault beam, and the spacing between the first clamp and the second clamp is adapted to the width of the vault beam; Step 3: The PLC controller receives the displacement information of each displacement sensor, and controls the driving device to move the first card plate and the second card plate into position in combination with the set positions of the first card plate and the second card plate in each card plate assembly; and places a lower support plate on the platform base between the first card plate and the second card plate; Step 4: hoist the inner and outer flange plates and the web plate of the arch beam onto the assembly platform, clamp the inner and outer flange plates with the first clamping plate and the second clamping plate, and place the upper support plate on the web plate; Step 5: After the vault beam is clamped and assembled, the upper and lower parts of the vault beam are welded using an automatic welding device; The assembly welding system comprises an assembly platform, an automatic welding device and a control cabinet with a built-in PLC controller. The assembly platform is formed by sequentially splicing a number of platform units. Each platform unit comprises a platform base and a plurality of cardboard assemblies for fixing the inner and outer flange plates of the vault beam. Each cardboard assembly is arranged at intervals along the length direction of the platform base. Each group of cardboard assemblies is equipped with a driving device. The driving device of the assembly platform is connected to the PLC controller. The automatic welding device can move along the upper edge of the inner and outer flange plates of the vault beam fixed to the cardboard assembly. The automatic welding device is connected to the PLC controller. The PLC controller controls the action of the driving device to move the cardboard assembly to a set position so that the cardboard assembly clamps the inner and outer flange plates of the vault beam. The automatic welding device is started to realize the welding of the web of the vault beam and the inner and outer flange plates. The clamping plate assembly includes a sliding shaft, and a first clamping plate and a second clamping plate arranged opposite to each other, the upper portion of the first clamping plate passes through a mounting groove opened on the platform base, and is arranged on the platform base through first sliding angle supports on both sides; the mounting grooves are arranged at intervals along the width direction of the platform base, and the length direction of the mounting grooves is consistent with the axial direction of the sliding shaft; the bottom of the first clamping plate is arranged on the first seat body, and the first seat body is connected to the sliding shaft; the upper portion of the second clamping plate passes through the mounting groove, and is arranged on the platform base through second sliding angle supports on both sides; the bottom of the second clamping plate is arranged on the second seat body, and the sliding shaft passes through the second seat body; the first seat body and the second seat body are respectively connected to a driving device, and the driving device drives the second clamping plate and the second clamping plate to move axially along the sliding shaft, so that the first clamping plate and the second clamping plate move to a set position; The driving device comprises a multi-stage hydraulic driving mechanism and a pneumatic push rod mechanism installed on the lower surface of the platform base, the driving end of the multi-stage hydraulic driving mechanism is hinged to the first connecting ear plate A provided on the first seat body, the pneumatic push rod mechanism is connected to the first connecting ear plate B provided on the first seat body, and the driving end of the pneumatic push rod mechanism is hinged to the second connecting ear plate provided on the second seat body; the driving directions of the multi-stage hydraulic driving mechanism and the pneumatic push rod mechanism are parallel to the axial direction of the sliding shaft; The tank vault beam is an "H" steel curved structure, including a web and inner and outer flange plates arranged on both sides of the web; the curvature of the connecting line of each clamping plate assembly at the set position is consistent with the curvature of the vault beam; the inner and outer flange plates and web of the vault beam are hoisted to the assembly platform, and the inner and outer flange plates are clamped by the first clamping plate and the second clamping plate.
2. The welding method according to claim 1, characterized in that: Displacement sensors are respectively arranged on the first base and the second base, and the displacement sensors are used to detect displacement information of the first card plate or the second card plate and send the displacement information to the PLC controller.
3. The welding method according to claim 1, characterized in that: The first seat body is an electromagnetic adsorption seat connected to the PLC controller.
4. The welding method according to claim 1, characterized in that: Four legs are arranged at the bottom of the platform base; and operation holes for back welding are opened on the platform base.
5. The welding method according to claim 1, characterized in that: The automatic welding device comprises an automatic welding trolley, a welding wire drum, a wire feeding mechanism and a welding gun head. Two left and right groups of running wheels are installed at the bottom of the automatic welding trolley. The spacing between the two groups of running wheels is consistent with the width of the arch beam, and the running wheels can run along the upper edges of the inner and outer flange plates of the arch beam; the welding wire drum, the wire feeding mechanism and the welding gun head are arranged in two groups, which are respectively arranged on both sides of the automatic welding trolley, and the two groups of wire feeding mechanisms are respectively connected to the protective gas pipeline; the welding wire is wound on the welding wire drum, and the welding wire head is led out from the welding wire drum and introduced into the welding gun head through the wire feeding mechanism; a weld seam recognition sensor is installed on the welding gun head, and the weld seam recognition sensor is connected to the PLC controller for automatic positioning, tracking and recognition of the weld seam.
6. The welding method according to claim 5, characterized in that: The wire feeding mechanism comprises a closed cover body connected to a protective gas pipeline, an upper roller and a lower roller arranged inside the cover body; the welding wire passes through a gap between the upper and lower rollers, and wire feeding is achieved by rotating the upper and lower rollers.