Gantry type laser spot welding and composite welding production line equipment for box type arm

Abstract

The invention discloses gantry type laser spot welding and composite welding production line equipment for a box type arm, which comprises a spot welding area and a composite welding area, and the spot welding area and the composite welding area form a double-station integrated welding production line for automatically welding the box type arm; the spot welding area comprises a spot welding tool clamp line and a spot welding gantry, the spot welding tool clamp line is used for positioning and conveying the box type arm, and the spot welding gantry is used for spot welding and fixing four plates of the box type arm; the composite welding area comprises a composite welding tool clamp line, a composite welding gantry and a gun cleaning system, the composite welding tool clamp line is used for bearing the box-shaped arm of the spot welding area and conveying and positioning the box-shaped arm, and the composite welding gantry is used for carrying out full-length welding and fixing on four plates of the box-shaped arm; and the gun cleaning system is used for cleaning a welding gun head in the composite welding gantry and cutting wires. According to the gantry type laser spot welding and composite welding production line equipment for the box type arm, the welding quality stability is improved, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and specifically to a gantry-type laser spot welding and hybrid welding production line equipment for box-shaped arms. Background Art

[0002] Currently, there are significant technical bottlenecks and efficiency shortcomings in the welding equipment for box-shaped arms. When the equipment is running, it is necessary to rely on manual labor to sequentially place the four plates of the box-shaped arm on the positioning tooling, and then manually complete the processes such as aligning the ends of the plates, positioning the side plates, and clamping the outside of the gantry. After manually spot welding and fixing the ends, the distance between the welding torches is manually adjusted to carry out the welding operation.

[0003] Such traditional operation modes expose multiple drawbacks:

[0004] 1. The traditional welding process has problems such as complex process, labor-intensive, and large energy consumption. The quality of the weld is greatly affected by human factors, so the welding quality is relatively unstable.

[0005] 2. Currently, the automation equipment in the industry has poor ability to achieve high-quality and high-efficiency flexible welding of large quantities and multiple varieties of workpieces. During the actual welding process, the requirements for the clamping accuracy of the workpieces are very high, which is undoubtedly a time-consuming and laborious project, and easily leads to poor welding or even product scrapping.

[0006] 3. During the welding process, due to the uneven heating and cooling in the welding area, the weld will shrink, resulting in deformation and distortion of the welded parts.

[0007] 4. The welding is not firm and causes dropping, and re-welding increases the workload.

[0008] 5. Groove welding is required, the single-piece welding time is long, the welding speed is slow, and the efficiency is low. Summary of the Invention

[0009] The purpose of the present invention is to provide a gantry-type laser spot welding and hybrid welding production line equipment for box-shaped arms to solve the problems raised in the above background art.

[0010] To achieve the above purpose, the present invention provides the following technical solutions:

[0011] A gantry-type laser spot welding and hybrid welding production line equipment for box-shaped arms, including a spot welding area and a hybrid welding area. The spot welding area and the hybrid welding area form an integrated welding production line with two working stations for automatically welding box-shaped arms;

[0012] The spot welding area includes two spot welding tooling fixture lines and two spot welding gantries. The spot welding tooling fixture lines are used for positioning and conveying the box-shaped arms, and the spot welding gantries are used for spot welding and fixing the four plates of the box-shaped arms;

[0013] The composite welding area includes two composite welding fixture lines, a composite welding gantry, and a gun cleaning system. The composite welding fixture lines are used to receive the box-shaped arms in the spot welding area and perform transportation and positioning. The composite welding gantry fully welds and fixes the four plates of the box-shaped arm. The gun cleaning system is used to clean the welding gun heads in the composite welding gantry and cut the wire.

[0014] Preferably, the spot welding fixture line includes a feeding platform, a bottom plate positioning mechanism, a side plate supporting mechanism, an end alignment mechanism, a core mechanism, and a lifting roller mechanism;

[0015] The bottom plate positioning mechanism includes two relatively moving positioning parts for clamping and positioning the box-shaped arm;

[0016] The side plate supporting mechanism includes multiple groups of electromagnets. The electromagnets are used to suck the side plates of the box-shaped arms on both sides. An electric motor screw module is arranged below the electromagnets. The electric motor screw module drives the electromagnets to move for positioning the side plates of the box-shaped arm. The electromagnets are arranged to be liftable relative to the feeding platform. When the spot welding gantry passes by, the corresponding electromagnets descend below the feeding platform to avoid interference.

[0017] The end alignment mechanism includes an alignment cylinder that pushes the ends of the four plates of the box-shaped arm to be aligned;

[0018] The core mechanism includes a top plate support frame and a core that are connected to each other. The top plate support frame is used to support the top plate of the box-shaped arm. Multiple groups of positioning pulleys are arranged on the core. The positioning pulleys abut against the inner wall of the box-shaped arm as a positioning reference. The core is driven by a driving module at the tail, and the movement of the core is synchronized with the spot welding gantry;

[0019] The lifting roller mechanism is controlled to lift by a pneumatic structure. When the workpiece is positioned, the lifting roller mechanism is located below the feeding platform. When transporting the workpiece, the lifting roller mechanism extends out of the feeding platform.

[0020] Preferably, the spot welding gantry includes a main frame, on which a side plate pressing mechanism, a side plate positioning mechanism, a spot welding robot, and a flame preheating mechanism are installed;

[0021] The side plate pressing mechanism includes a pressing cylinder for helping the side plates of the box-shaped arm to be pressed in place from the electromagnets;

[0022] The side plate positioning mechanism includes two pairs of servo motors and followers. The servo motors drive the followers to fit the side plates of the box-shaped arm to the sides of the positioning pulleys on the core;

[0023] The spot welding robot is a six-joint robot equipped with a ground rail at the bottom. A laser welding head, a laser tracking component, and a ranging component are installed on the spot welding robot;

[0024] The flame preheating mechanism includes a flame gun bracket installed on the spot welding gantry. A flame gun is installed on the flame gun bracket, and the flame gun is connected to a pressure regulating valve, a check valve, and a gas tank through a gas pipeline.

[0025] Preferably, the composite welding fixture line includes a conveying line table. An upper guide wheel, a transition guide wheel, a lower guide wheel, a lifting conveyor roller path, a centering guide mechanism, and a terminal detection switch are sequentially installed on the conveying line table. When the workpiece is conveyed in place, the lifting conveyor roller path descends below the conveying line table, and the centering guide mechanism rises above the conveying line table to position the workpiece.

[0026] Preferably, the lifting conveyor roller path includes multiple groups of frames arranged side by side. Electric drums are installed at the top of the frames for conveying workpieces. A spiral lifting pair is arranged on the frames for controlling the lifting movement of the drums. All the spiral lifting pairs are commonly connected to a long shaft, and the lifting movement is driven through the long shaft.

[0027] Preferably, the centering guide mechanism includes linear guide rails. A guide block mounting plate is installed on the linear guide rails. One of the guide block mounting plates is driven by a guide cylinder fixed on the side of the linear guide rails. The two guide block mounting plates are connected through a gear and rack pair with opposite movement directions. Adjustable guide blocks are installed above the guide block mounting plates for clamping the workpiece for guiding and positioning.

[0028] Preferably, the composite welding gantry includes a traveling mechanism and a composite welding gun group. The traveling mechanism is used for the high-precision traveling welding of the composite welding gun group.

[0029] Preferably, the composite welding gun group consists of 4 composite welding guns. Every two groups correspond to a welding station. The composite welding gun includes a laser head and an arc welding gun head, and the position of the arc welding gun head relative to the laser head is adjustable.

[0030] Preferably, the gun cleaning system includes a bracket installed between two welding stations, a pushing cylinder installed on the bracket, and a gun cleaner. The gun cleaner is driven by the pushing cylinder.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This patent has significant advantages in welding technology, automation level, welding deformation control, and welding quality, greatly improving production efficiency and product quality, effectively reducing production costs, and being of great significance for promoting the development of welding technology in the construction machinery industry.

[0033] 1. Optimize the welding process: Add a flame heating device at the spot welding station to preheat the workpiece, which helps reduce the deformation of the workpiece and is conducive to post-welding forming.

[0034] 2. Improve the automation level: The equipment integrates a series of automated processes such as a feeding transfer machine, a gantry spot welding machine, a conveyor roller conveyor, and a composite welding gantry welding machine, realizing the full-process automation from workpiece feeding, positioning, welding to finished product output. It improves the welding ability of large quantities and multiple varieties of workpieces, reduces the dependence on manual labor, reduces the influence of human factors on the weld quality, and improves the stability of welding quality.

[0035] 3. Reduce welding deformation: The design of the centering and guiding mechanism of the composite welding fixture line, combined with the preheating measures at the spot welding station, effectively reduces the deformation and distortion of the welded parts caused by uneven heating and cooling during the welding process. Compared with traditional arc welding, it can save a large amount of post-welding straightening man-hours and costs.

[0036] 4. Improve welding quality and efficiency: Adopt the four-gun laser composite welding technology, combining the advantages of laser welding and arc welding, simplifies the welding process without beveling, and simultaneously welds multiple welds. The welding speed is increased, the single-piece welding time is shortened, the production capacity of one device is equivalent to that of multiple traditional arc welding equipment, and the welding is firm, reducing the situation of dropping and rework, improving production efficiency and reducing production costs. Description of the Drawings

[0037] Figure 1 It is a schematic diagram of the overall spot welding area;

[0038] Figure 2 It is a schematic diagram of the structure of the spot welding fixture line;

[0039] Figure 3 It is for Figure 2 partial enlarged view;

[0040] Figure 4 It is a schematic diagram of the structure of the flame preheating mechanism;

[0041] Figure 5 It is a schematic diagram of the structure of the inner core mechanism;

[0042] Figure 6 It is a schematic diagram of the structure of the drive module;

[0043] Figure 7 It is a schematic diagram of the structure of the spot welding gantry;

[0044] Figure 8 It is a schematic diagram of the overall composite welding area;

[0045] Figure 9 It is a schematic diagram of the structure of the composite welding fixture line;

[0046] Figure 10Schematic diagram of the lifting conveyor roller path structure;

[0047] Figure 11 Schematic diagram of the centering and guiding mechanism structure;

[0048] Figure 12 Schematic diagram of the composite welding gantry structure;

[0049] Figure 13 is Figure 12 partial schematic diagram of;

[0050] Figure 14 Schematic diagram of the gun cleaning system.

[0051] In the figure: 100, spot welding area; 110, spot welding fixture line; 111, feeding platform; 112, bottom plate positioning mechanism; 1121, positioning part; 113, side plate support mechanism; 1131, electromagnet; 114, end alignment mechanism; 1141, alignment cylinder; 115, lifting roller mechanism; 116, inner core mechanism; 1161, top plate support frame; 1162, inner core; 1163, drive module; 120, spot welding gantry; 121, main frame; 122, side plate pressing mechanism; 123, side plate positioning mechanism; 124, spot welding robot; 125, ground rail; 126, flame preheating mechanism; 1261, flame gun support; 1262, flame spray gun; 200, composite welding area; 210, composite welding fixture line; 211, conveyor line table; 212, first-stage guide wheel; 213, second-stage guide wheel; 214, lifting conveyor roller path; 2141, frame; 2142, roller; 2143, spiral lifting pair; 2144, long shaft; 215, centering and guiding mechanism; 2151, linear guide rail; 2152, guide block mounting plate; 2153, gear rack pair; 2154, guiding cylinder; 2155, guide block; 216, terminal detection switch; 217, transition guide wheel; 220, composite welding gantry; 221, traveling mechanism; 222, composite welding gun group; 2221, laser head; 2222, arc welding gun head; 230, gun cleaning system; 231, support; 232, gun cleaner; 233, pushing cylinder. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] This application is a laser welding equipment for box-shaped arm bodies. The equipment includes: two spot welding gantries 120, two sets of spot welding fixture lines 110, one composite welding gantry 220, and two sets of composite welding fixture lines 210. The technological process of the equipment is as follows: The loading transfer machine feeds the spot welding fixture line 110 (welding the four plates of the box-shaped arm), the spot welding gantry 120 preliminarily fixes the four plates by spot welding, the conveying roller conveys the workpiece to the composite welding station, the composite welding fixture line 210 positions the workpiece, and the composite welding gantry 220 welds the box-shaped arm. After welding, the conveying roller conveys the finished workpiece to the next process.

[0054] As Figure 1 and Figure 2 shown, the structure of the spot welding station is as follows:

[0055] The spot welding area 100 includes the spot welding fixture line 110 and the spot welding gantry 120. The spot welding fixture line 110 is linked through the bottom plate positioning mechanism 112, side plate support mechanism 113, and end alignment mechanism 114 on it, and cooperates with the inner core mechanism 116 to achieve full-direction rough positioning and pressing of the 4 plates of the box-shaped arm. After positioning, the spot welding gantry 120 performs tack welding operations, and a flame preheating mechanism 126 is added to preheat the workpiece to help the workpiece reduce deformation and facilitate post-welding forming. After spot welding, the workpiece is then pushed into the next station.

[0056] As Figure 2-6 shown, specifically, the spot welding fixture line 110 is composed of a feeding platform 111, a bottom plate positioning mechanism 112, a side plate support mechanism 113, an end alignment mechanism 114, an inner core mechanism 116, and a lifting roller mechanism 115. The corresponding structures and functions of the equipment are as follows:

[0057] 1) The bottom plate positioning mechanism 112: Installed on the top of the feeding platform 111, the bottom plate positioning mechanism 112 contains two positioning parts 1121 that can approach each other, and both sides of the bottom plate of the box-shaped arm are positioned by squeezing through the positioning parts 1121.

[0058] 2) The side plate support mechanism 113: The side plate support mechanism 113 is installed on both sides of the top plate of the feeding platform 111. The loading transfer machine conveys the side plates of the box-shaped arm in place, and the electromagnet 1131 for side support attracts the side plates, and the bottom servo motor drives the lead screw to move to achieve rough positioning of the side plates. The same structural design is adopted on both sides, and the side plate support mechanism 113 can be set to be liftable. When the spot welding gantry 120 passes by, the side plate support mechanism 113 can be lowered into the feeding platform 111 to prevent interference.

[0059] 3) The end alignment mechanism 114: The end alignment mechanism 114 is installed at the end of the feeding platform 111. After the four plates are placed in place through the loading transfer machine, the four side plates are aligned by pushing through the alignment cylinder 1141.

[0060] 4) Inner core mechanism 116: The inner core mechanism 116 is located inside the box-type arm to position the box-type arm. The inner core mechanism 116 includes an inner core 1162, a top plate support frame 1161 and a drive module 1163. The inner core 1162 adopts a four-sided pulley mechanism, and its vertical and horizontal dimensions are the internal dimensions of the four-sided plate arm, which serves as the positioning reference of the quadrilateral cylinder arm. The top plate support frame 1162 on the inner core mechanism 116 supports the top plate of the box-type arm, and the inner core passes through. The drive module 1163 is installed at the tail of the feeding platform 111 to push the inner core 1162 to move. The movement of the inner core 1162 is synchronized with the spot welding gantry 120.

[0061] 5) Lifting roller mechanism 115: The roller line drive uses a servo motor to drive the chain sprocket structure to drive the roller to operate, and a pneumatic mechanism is used to control the lifting of the roller. When the workpiece is positioned, the roller line is lower than the height of the work table. When the workpiece is transported, the roller line extends out of the table to drive the workpiece into the next station.

[0062] refer to Figure 7 The spot welding gantry 120 is composed of a main frame 121, a side plate pressing mechanism 122 installed on the main frame 121, a side plate positioning mechanism 123, a spot welding robot 124 and a flame preheating mechanism 126. The corresponding structures and functions of the equipment are as follows:

[0063] Side panel pressing mechanism 122: The side panel attracted by the side supporting electromagnet 1131 sometimes cannot fall down by its own weight when the magnet is disconnected, and the pressing electric cylinder of the side panel pressing mechanism 122 is required to give a pressing action to help the side panel fall into place.

[0064] Side panel positioning mechanism 123: The side panel positioning mechanism 123 is driven by two pairs of servo electric cylinders to extend the followers at the same time, and cooperate with the inner core tooling to tightly fit the two side panels to the two sides of the inner core 1162 to achieve side panel positioning.

[0065] Spot welding robot 124: A six-joint robot is used, and the bottom is equipped with a seventh-axis robot ground track 125. The robot is equipped with laser welding heads, laser tracking, ranging and other components. The position of the side panels is measured before each spot welding. After confirming the accuracy, the spot welding is carried out in sequence according to the taught positions. The robot is moved through the ground track 125 to complete the spot welding operation of the entire box-type arm.

[0066] Flame preheating mechanism 126: The flame preheating mechanism 126 is installed on the main frame 121 of the spot welding gantry 120, and is composed of a gas tank, a gas pipeline, a pressure regulating valve, a check valve, a flame spray gun 1262 and a flame gun bracket 1261. It is mainly used to heat the steel plate by flame preheating to relieve stress after the workpiece is assembled and before the spot welding operation, so as to prevent the box-type arm side plate from being wavy after the composite welding.

[0067] Combined with the above structure, the spot welding process:

[0068] 1) The end alignment mechanism 114 moves to the positioning position;

[0069] 2) The loading transfer machine places the bottom plate, and the bottom plate positioning mechanism 112 positions the bottom plate;

[0070] 3) The inner core 1162 is pushed into the bottom plate, driving the cover support frame 1161 onto the bottom plate;

[0071] 4) The loading transfer machine places the left and right side plates, and the electromagnet 1131 on the side plate support mechanism 113 attracts the side plates;

[0072] 5) The loading transfer machine places the cover plate;

[0073] 6) The spot welding robot 124 moves to the starting point of the arm box welding;

[0074] 8) The servo motor drives the follower to press the side plates and the inner core 1162;

[0075] 9) The lower piezoelectric cylinder on the side plate pressing mechanism 122 extends to press the edge of the side plate and the upper surface of the cover plate; the side plate positioning mechanism 123 closely fits the two side plates to both sides of the inner core 1162;

[0076] 10) Before performing the workpiece spot welding, the flame preheating mechanism 126 is used to heat the steel plate to relieve stress, preventing the side plates of the box - type arm from being wavy after composite welding;

[0077] 11) The spot welding robot 124 and the inner core 1162 move simultaneously. During the movement, the two robots complete the spot welding of the 4 seams of the workpiece; during this process, the side plate support mechanism 113 that interferes with the side plate positioning mechanism 123 makes an automatic avoidance;

[0078] 12) After completing the welding of the workpiece, the spot welding robot 124 and the inner core mechanism 116 continue to move forward and separate from the workpiece;

[0079] 13) Finally, the lifting roller mechanism 115 rises to convey the spot - welded arm box to the composite welding area 200.

[0080] As Figure 8 shown, the structure of the composite welding station is as follows:

[0081] The equipment in the composite welding area 200 mainly consists of a composite welding gantry 220, a composite welding fixture line 210, and a gun cleaning system 230, which completes the full - automatic conveying, clamping, positioning, and welding of the already - spot - welded box - type arm, and can automatically clean the gun.

[0082] 1) The composite welding fixture line 210: As Figure 9As shown in the figure, the composite welding fixture line 210 is horizontally arranged, including a lifting conveyor roller table 214, front and rear positioning fixtures, a conveyor line table 211, etc., which are used for workpiece transfer, positioning and clamping. The workpiece enters the composite line conveyor from the right side. At this time, the lifting conveyor roller table 214 is in the lifting and running state, so that the workpiece first passes through the first-stage guide wheel 212 for guiding, adjusts the general direction of the workpiece in place, and then passes through the transition guide wheel 217 to help the workpiece at the line connection pass smoothly, and enters the second-stage guide wheel 213 for secondary guiding and correction. When the workpiece is conveyed in place, the lifting conveyor roller table 214 descends, and the centering and guiding mechanism 215 lifts to accurately position the workpiece. After positioning is completed, the composite welding gantry 220 is started to perform welding operations on the workpiece.

[0083] 2) Lifting conveyor roller table 214: As Figure 10 , it includes an electric drum 2142, a transmission long shaft 2144, a linear spiral lifting pair 2143, a frame 2141, etc., which are used to connect with the front spot welding conveyor line and the rear telescopic drum line, and convey the spot-welded workpiece to the composite welding station. The entire drum line is only equipped with a set of driving devices, which are connected by the long shaft 2144 and the spiral lifting pair 2143 to drive the drum 2142 to move up and down to ensure height consistency.

[0084] 3) Centering and guiding mechanism 215: As Figure 11 , the centering and guiding mechanism 215 includes a gear-rack structure, an adjustable guide block 2155, a guide block mounting plate 2152, a linear guide rail 2151, and a guide cylinder 2154. When the workpiece is in place, the conveying drum 2142 descends, and the guide cylinder 2154 of the centering and guiding mechanism 215 is started, so that the two end centering blocks move towards the middle at the same time. Through the gear-rack pair 2153, it is ensured that the middle position always remains consistent and does not deviate.

[0085] 4) Composite welding gantry 220: It includes a traveling mechanism (221) and a composite welding torch group (222);

[0086] The detailed structure of the traveling mechanism is as follows:

[0087] Traveling mode: Linear guide rail type box-shaped ground rail, double-rack double-servo synchronous drive, used for high-precision traveling welding of 4 groups of welding torches.

[0088] Driving gantry: It is composed of a double-drive X-axis, a double-Y-axis crossbeam, and 4 independent Z-axes.

[0089] Double-drive X-axis: It is composed of a welding ground rail, an X-axis drive, an encoder assembly, a slide plate, and corresponding accessories.

[0090] Welding ground rail: It has the characteristics of high rigidity and high strength, and rails and racks are laid on it.

[0091] X-axis drive: The motor is connected to the reduction gear and the gear. The motor drives the gear to rotate, driving the slide plate to move on the ground rail.

[0092] Y-axis crossbeam main body: It is welded by low-carbon steel. After finite element analysis, the overall weight is controlled as much as possible while meeting the rigidity requirements.

[0093] Independent moving slide plate: It consists of a T-shaped welded slide plate, a servo motor, a reduction gear, and a gear. The wire feeder and the supporting beam are connected and fixed to the slide plate through the mounting bracket.

[0094] Z-axis saddle: It consists of a welded saddle, a guide rail, a lead screw, and a servo motor. Among them, the slider is connected to the Y-axis slide plate, adopting the movement form of fixing the slider and moving the guide rail. The motor and the lead screw are directly connected to provide power, enabling the saddle to move up and down.

[0095] Gantry: Relevant welding configuration equipment is installed on the upper part, including a laser, an arc welding power source, a water chiller, a wire barrel, a wire feeder, etc. (an air conditioner needs to be installed for cooling).

[0096] 5) Composite welding torch group 222: Refer to Figure 13 , 4 groups of composite welding torches and related adjustment mechanisms are installed, which are composed of a laser head 2221, an arc welding torch head 2222, a sensor, an adjustment module, and corresponding connecting blocks. The arc welding torch head 2222 is fixed on the adjustment module, and the relative position between the welding wire and the laser focus is adjusted through the up-and-down and rotational movements of the rotation module. The relative position between the sensor and the arc welding torch head 2222 is fixed. It has the functions of fine adjustment and quick retraction.

[0097] 6) Gun cleaning system 230: Refer to Figure 8 and Figure 14 , the composite welding torch group 222 has three working positions, corresponding to two welding positions on the left and right, and the middle position is the gun cleaning position. The gun cleaning system 230 includes brackets 231 installed at the two welding positions. A gun cleaner 232 is installed on the brackets 231 and is driven by a push cylinder 233 installed on the brackets 231. After each workpiece is welded, the push cylinder 233 drives the gun cleaner 232 to automatically clean and cut the wire of the arc welding torch head 2222.

[0098] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gantry type laser spot welding and composite welding production line equipment for a box-type arm, comprising a spot welding area (100) and a composite welding area (200), characterized in that: The spot welding area (100) and the composite welding area (200) form a dual-station integrated welding production line for automated welding of box-type arms; The spot welding area (100) comprises two spot welding fixture lines (110) and two spot welding gantries (120), wherein the spot welding fixture lines (110) are used to position and transport the box-shaped arm, and the spot welding gantries (120) are used to perform spot welding and fixation on four plates of the box-shaped arm; The composite welding area (200) comprises two composite welding fixture lines (210), a composite welding gantry (220) and a gun cleaning system (230); the composite welding fixture line (210) is used to receive the box-shaped arm of the spot welding area (100) and to transport and position it; the composite welding gantry (220) is used to fully weld and fix four plates of the box-shaped arm; and the gun cleaning system (230) is used to clean and cut the welding gun head in the composite welding gantry (220).

2. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 1 is characterized in that: The spot welding fixture line (110) comprises a feeding platform (111), a bottom plate positioning mechanism (112), a side plate supporting mechanism (113), an end alignment mechanism (114), an inner core mechanism (116) and a lifting roller mechanism (115); The bottom plate positioning mechanism (112) comprises two positioning members (1121) that move relative to each other and are used to clamp and position the box-shaped arm; The side plate support mechanism (113) comprises a plurality of groups of electromagnets (1131), the electromagnets (1131) being used to absorb the side plates of the box-shaped arms on both sides, a motor screw module being arranged below the electromagnets (1131), the motor screw module driving the electromagnets (1131) to move and position the side plates of the box-shaped arms, the electromagnets (1131) being arranged to be liftable relative to the feeding platform (111), and when the spot welding gantry (120) passes by, the corresponding electromagnets (1131) are lowered to below the feeding platform (111) to avoid interference; The end alignment mechanism (114) comprises an alignment cylinder (1141), and the alignment cylinder (1141) pushes the ends of the four plates of the box-shaped arm to align; The inner core mechanism (116) comprises a top plate support frame (1161) and an inner core (1162) connected to each other, the top plate support frame (1161) is used to support the top plate of the box-shaped arm, a plurality of positioning pulleys are arranged on the inner core (1162), the positioning pulleys are against the inner wall of the box-shaped arm as a positioning reference, the inner core (1162) is driven by a driving module (1163) at the rear, and the movement of the inner core (1162) is synchronized with the spot welding gantry (120); The lifting roller mechanism (115) adopts a pneumatic structure to control lifting. When the workpiece is positioned, the lifting roller mechanism (115) is located below the feeding platform (111). When the workpiece is transported, the lifting roller mechanism (115) extends out of the feeding platform (111).

3. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 2 is characterized in that: The spot welding gantry (120) comprises a main frame (121), on which a side plate pressing mechanism (122), a side plate positioning mechanism (123), a spot welding robot (124) and a flame preheating mechanism (126) are mounted; The side plate pressing mechanism (123) comprises a pressing electric cylinder, which is used to help the side plate of the box-shaped arm be pressed up and down by the electromagnet (1131) into place; The side plate positioning mechanism (123) comprises two pairs of servo motors and followers, and the servo motors drive the followers to fit the side plates of the box-shaped arms onto the side surfaces of the positioning pulleys on the inner core (1162); The spot welding robot (124) is a six-joint robot, with a ground rail (125) at the bottom, and a laser welding head, a laser tracking component and a distance measuring component are installed on the spot welding robot (124); The flame preheating mechanism (126) comprises a flame gun bracket (1261) mounted on the spot welding gantry (120), a flame spray gun (1262) being mounted on the flame gun bracket (1261), and the flame spray gun (1262) being connected to a pressure regulating valve, a check valve and a gas tank via a gas transmission pipeline.

4. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 1 is characterized in that: The composite welding fixture line (210) comprises a conveyor line platform (211), on which a primary guide wheel (212), a transition guide wheel (217), a secondary guide wheel (213), a lifting conveyor roller (214), a centering guide mechanism (215) and a terminal detection switch (216) are sequentially mounted. When a workpiece is transported to a certain position, the lifting conveyor roller (214) descends to below the conveyor line platform (211), and the centering guide mechanism (215) is lifted to above the conveyor line platform (211) to position the workpiece.

5. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 4 is characterized in that: The lifting conveying roller (214) comprises a plurality of sets of racks (2141) arranged side by side, an electric roller (2142) being installed on the top of the rack (2141) for conveying workpieces, a spiral lifting pair (2143) being arranged on the rack (2141) for controlling the lifting movement of the roller (2142), all the spiral lifting pairs (2143) being connected to a long shaft (2144) via a coupling, and the lifting movement is realized by driving the long shaft (2144).

6. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 4 is characterized in that: The centering guide mechanism (215) comprises a linear guide rail (2151), on which a guide block mounting plate (2152) is mounted, wherein one of the guide block mounting plates (2152) is driven by a guide cylinder (2154) fixed to the side of the linear guide rail (2151), and the two guide block mounting plates (2152) are connected by a gear rack pair (2153) and move in opposite directions, and an adjustable guide block (2155) is mounted above the guide block mounting plate (2152) for clamping a workpiece for guiding and positioning.

7. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 1 is characterized in that: The composite welding gantry (220) comprises a walking mechanism (221) and a composite welding gun group (222); the walking mechanism (221) is used for high-precision walking welding of the composite welding gun group (222).

8. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 7 is characterized in that: The composite welding gun group (222) comprises four groups of composite welding guns, with every two groups corresponding to one welding station. The composite welding gun comprises a laser head (2222) and an arc welding gun head (2221), and the position of the arc welding gun head (2221) relative to the laser head (2222) is adjustable.

9. The gantry type laser spot welding and composite welding production line equipment for box-type arms according to claim 8, characterized in that: The gun cleaning system (230) comprises a support (231) installed between two welding stations, a pushing cylinder (233) installed on the support (231), and a gun cleaner (232), wherein the gun cleaner (232) is driven by the pushing cylinder (233).

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