Synchronous positioning frame for multiple rows of pipes in full-automatic welding of coiled pipes

Abstract

The invention relates to the technical field of pipeline welding, in particular to a serpentine pipe full-automatic welding multi-row pipe synchronous positioning frame which comprises two positioning frame bodies and a plurality of conveying rollers rotationally installed between the two positioning frame bodies, and a welding table is welded to the outer wall of one positioning frame body; the welding table is provided with a material storage structure, a material pushing structure and a shielding structure used in cooperation with the material pushing structure. The pushing structure comprises an electric telescopic rod fixed to the upper surface of the welding table, and a pushing frame is installed at the output end of the electric telescopic rod. According to the multi-row pipe synchronous positioning frame for full-automatic welding of the serpentine pipes, closed welding is achieved through the vertically-distributed baffle plate structures, strong welding arc light is effectively isolated, eyes and skin of operators are protected, welding smoke is limited in the closed cavity and can be efficiently extracted and purified from the source through air extraction equipment, and the welding quality is improved. And the workshop air quality is greatly improved.

Description

Technical Field

[0001] This application relates to the field of pipeline welding technology, and in particular to a fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes. Background Technology

[0002] As a highly efficient heat exchange element, serpentine tubes are widely used in industrial fields such as boilers, heat exchangers, and refrigeration equipment. Currently, the welding positioning frames for serpentine tubes used in the industry are mainly divided into two categories: manual welding positioning frames and robotic arm welding positioning frames. Robotic arm welding positioning frames represent a relatively advanced automation solution. This positioning frame is also responsible for workpiece clamping and positioning, introducing welding robots or specialized machines. Through pre-programmed paths, the robotic arm drives the welding torch to automatically complete the welding process. This improves the consistency of welding efficiency to a certain extent and reduces the reliance on welder skills. However, whether operated manually or automated by robotic arms, existing serpentine tube welding positioning frames generally suffer from a common and critical functional deficiency: the lack of a functional module that effectively shields the welding area when the U-shaped tube connects to the main tube; existing tooling is usually an open frame structure, with the welding process directly exposed to the workshop environment. The lack of the aforementioned functions leads to a series of problems, such as insufficient gas protection. Open welding relies entirely on the umbrella-shaped gas shield on the welding torch, and its protective effect is easily affected by airflow in the workshop, such as ventilation and personnel movement, resulting in unstable protection and difficulty in ensuring the protection of all welds. At the same time, the intense arc light generated by welding can cause serious damage to the eyes and skin of the operator and surrounding personnel. Open welding requires the use of large mobile light shields. In addition, a large amount of harmful fumes and metal particles generated during the welding process will permeate the air throughout the workshop. Although a centralized dust removal system can be used, the source capture rate is low, which seriously endangers the respiratory health of employees. Therefore, a serpentine tube fully automatic welding multi-row tube synchronous positioning frame is proposed to solve the problems mentioned above. Summary of the Invention

[0003] To address the shortcomings of existing technologies and improve the welding environment, this application provides a fully automatic multi-row pipe synchronous positioning frame for serpentine pipe welding, which has the advantages of effectively isolating the arc light generated during welding and improving the welding environment, thus solving the problems existing in the background technology.

[0004] This application provides a fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes, which adopts the following technical solution: A fully automatic welding multi-row tube synchronous positioning frame for serpentine tubes includes two positioning frame bodies and several conveying rollers rotatably installed between the two positioning frame bodies. A welding table is welded on the outer wall of one of the positioning frame bodies. The welding table is provided with a material storage structure, a material pushing structure, and a shielding structure used in conjunction with the material pushing structure. The pushing structure includes an electric telescopic rod fixed to the upper surface of the welding table. A pusher is installed on the output end of the electric telescopic rod, and a suction cup is installed at the end of the pusher. A piston assembly is also provided on the welding table. A connecting plate and a connecting rod connected to the piston assembly and the shielding structure are respectively installed on the output end of the electric telescopic rod. The shielding structure is used in conjunction with the pushing structure. The shielding structure includes two shielding plates that are distributed vertically. Each of the two shielding plates has an extension groove on one side opposite to the other, and an induction heating module is installed inside the extension groove on each of the two shielding plates. A sliding plate and two first guide wheels are provided on the same side of the two baffles. Each of the two first guide wheels is equipped with a connecting shaft that is fixed to one side of the two baffles respectively. The sliding plate has a guide groove inside that rolls with the first guide wheel. The end of the connecting rod is fixed to the side wall of the sliding plate.

[0005] Optional: The storage structure is used to store the U-shaped head in the serpentine tube. The storage structure includes a storage box bolted to a welding platform. The storage box has a storage trough inside, and a lifting platform is elastically provided on the bottom wall of the storage trough. The top side of the storage box is open, and the height of the storage box is flush with the bottom baffle plate.

[0006] Optionally: A limiting sliding arm extending from the storage bin is fixed to the side wall of the lifting platform, and a pushing component is provided on the side wall of the storage bin to cooperate with the displacement of the sliding plate.

[0007] Optionally: The piston assembly is used in conjunction with the pusher structure. The piston assembly includes a plug disposed on the upper surface of the welding platform. The plug includes a cylinder fixed to the upper surface of the welding platform. The cylinder has a chamber inside, and a partition is installed inside the chamber. A first piston is disposed inside the right chamber, and a second piston is disposed inside the left chamber. A plug rod extending to the outside of the cylinder is installed between the first piston and the second piston. The end of the plug rod is connected and fixed to the connecting plate.

[0008] Optionally: Check valves corresponding to the two chambers are installed on the outer wall of the cylinder, and a first connecting pipe is installed at the end of the check valve on the left chamber, and a second connecting pipe is installed at the end of the check valve on the right chamber. The first connecting pipe is fixedly connected to the push frame, and the second connecting pipe is fixedly connected to the connecting rod.

[0009] Optionally: A buffer spring is installed between the outer surface of the stopper rod and the side wall of the cylinder; a guide groove for limiting the sliding plate is provided on the side wall of the welding station; a slider that slides in cooperation with the guide groove is installed on the side wall of the sliding plate; the slider is hollow inside and has an infusion hole communicating with the connecting rod inside.

[0010] Optionally: the guide groove is inclined, the number of extension grooves is two, the upper surface of the welding table is provided with a limiting component for guiding the two shielding plates, the limiting component includes a guide rod fixed to the upper surface of the welding table, the guide rod passes through the interior of the two shielding plates, and the outer surface of the guide rod is provided with a second return spring fixed to the upper and lower sides of the two shielding plates.

[0011] Optionally: The pushing assembly includes an abutment seat slidably disposed inside the storage bin, an adjusting rod is threadedly installed inside the abutment seat, and an abutment block abutting against the limiting sliding arm is fixed at the bottom end of the adjusting rod. A guide slope from low to high is provided on the top side of the abutment seat, and a second guide wheel abutting against the guide slope is installed on the bottom side of the slide plate.

[0012] Optionally, a valve is provided inside the bottom baffle plate. The valve includes a sealing block disposed inside the bottom baffle plate. The bottom baffle plate has a first connecting groove and a second connecting groove inside. The first connecting groove and the second connecting groove are connected at opposite ends and respectively connected to the extension groove and the outside at opposite ends.

[0013] Optionally: the blocking block is slidably disposed inside the first connecting groove, and a first return spring is installed between the bottom side of the blocking block and the bottom wall of the first connecting groove. A three-way pipe is fixedly connected to the bottom side of the first connecting groove, and the other two ends of the three-way pipe are respectively connected to a gas supply device and a gas extraction device. A push rod for driving the blocking block is installed inside the extension groove on the top shield plate.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, through the closure of the upper and lower baffles along the guide rod, can form a cavity together with the extension groove, tightly enclosing the weld joint between the U-shaped tube and the main tube, effectively preventing outside air from entering the welding area, and providing a good protective environment for welding. By enclosing the weld joint between the U-shaped tube and the main tube in the cavity formed by the extension groove and injecting inert protective gas, the air inside the cavity is effectively eliminated, preventing the metal from reacting with oxygen and nitrogen in the air during the welding process, avoiding defects such as oxidation and nitriding, thereby improving the quality and performance of the weld joint.

[0015] 2. This invention, through its upper and lower distributed shielding plate structure, not only achieves sealed welding, effectively isolating the intense welding arc light, but also protects the operator's eyes and skin. Furthermore, welding fumes are confined within the sealed cavity and can be efficiently extracted and purified from the source by an exhaust system, greatly improving the air quality in the workshop. Simultaneously, protective gas can be introduced from the bottom, utilizing its greater density than air to squeeze out residual air. At the same time, the exhaust system is connected via a three-way pipe to ensure that the air inside the cavity is completely replaced, improving the replacement effect of the protective gas and further enhancing the welding quality.

[0016] 3. In this invention, through the elastic setting of the lifting platform in the material storage structure, as the U-shaped tube is continuously removed, the lifting platform will automatically rise under the action of elastic force, keeping the remaining U-shaped tube at a suitable height, ensuring that the pushing structure can smoothly push the bottom U-shaped tube, thus achieving continuous and stable material supply, eliminating the need for frequent manual adjustment of the position of the U-shaped tube, and reducing labor intensity.

[0017] 4. In this invention, the piston assembly and the pusher structure work together in a coordinated manner. When the electric telescopic rod extends and the pusher moves forward to make the suction cup contact the surface of the U-shaped tube, the connecting plate also pulls the stopper rod at the same time, changing the volume of the right chamber. Through the combination of check valves, air is drawn from the first connecting pipe, thereby instantly creating a vacuum in the suction cup, firmly holding the U-shaped tube, ensuring that the U-shaped tube will not fall off or shift during the conveying process, thus improving the reliability of the conveying. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the overall structure of this application; Figure 2 This is a schematic diagram of the welding station structure of this application; Figure 3 This is a schematic diagram of the structure of the storage tank in this application; Figure 4 This is a schematic diagram of the material pushing structure of this application; Figure 5 This is a cross-sectional view of the piston assembly of this application; Figure 6 This is a schematic diagram of the shielding structure of this application; Figure 7 This is a structural schematic diagram of the skateboard used in this application; Figure 8 This is a schematic diagram of the structure of the component that drives this application; Figure 9 This is a cross-sectional view of the valve structure in this application.

[0019] Explanation of reference numerals in the attached figures: 1. Positioning frame; 2. Conveying roller; 3. Welding table; 31. Guide groove; 4. Storage structure; 41. Storage box; 42. Storage trough; 43. Lifting platform; 44. Limiting sliding arm; 5. Pushing structure; 51. Electric telescopic rod; 52. Pushing frame; 53. Suction cup; 54. Connecting plate; 55. Connecting rod; 6. Piston assembly; 61. Plug; 611. Cylinder; 612. Chamber; 613. Partition; 614. First piston; 615. Second piston; 616. Plug rod; 617. Buffer spring; 62. Check valve; 63. First connecting pipe; 64. 7. Connecting pipe; 8. Shielding structure; 9. Shielding plate; 10. Extension groove; 11. Induction heating module; 12. Slide plate; 13. Guide groove; 14. Connecting shaft; 15. First guide wheel; 16. Slider; 17. Infusion port; 18. Second guide wheel; 19. Pushing assembly; 10. Abutment seat; 11. Adjusting rod; 12. Abutment block; 13. Guide slope; 14. Valve; 15. First connecting groove; 16. Second connecting groove; 17. Blocking block; 18. First return spring; 19. T-connector; 10. Push rod; 11. Guide rod; 12. Second return spring. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-9 This application will be described in further detail.

[0021] Example 1, such as Figures 1-7 As shown, a fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes includes two positioning frame bodies 1 and several conveying rollers 2 rotatably installed between the two positioning frame bodies 1. A welding table 3 is welded to the outer wall of one of the positioning frame bodies 1. The welding table 3 is provided with a material storage structure 4, a material pushing structure 5, and a shielding structure 7 used in conjunction with the material pushing structure 5. It should be noted that the number of welding tables 3 can be set to two, and the number of structures on them is also two. When there are two welding tables 3, the two welding tables 3 are located on opposite sides of the two positioning frame bodies 1, thereby enabling synchronous positioning and welding of multiple branch pipes and U-shaped pipes in the serpentine pipe. The end of the conveying rollers 2 is connected to a drive device for conveying multiple main pipes. To facilitate the transport of U-shaped tubes within a serpentine conduit, a storage structure 4 is used to store the U-shaped heads within the serpentine conduit. The storage structure 4 includes a storage box 41 bolted to a welding table 3. The storage box 41 has a storage trough 42 inside, and a lifting platform 43 is elastically provided on the bottom wall of the storage trough 42. It should be noted that the top side of the storage box 41 is open, and the height of the storage box 41 is flush with the bottom baffle plate 71. This design allows the U-shaped tubes to smoothly and easily enter the welding area formed by the baffle structure 7 after being pushed out of the storage box 41, reducing collisions and jamming of the U-shaped tubes during transport and ensuring smooth transport. Understandably, the storage trough 42 inside the storage bin 41 provides a dedicated storage space for the U-shaped tubes, allowing them to be neatly stacked and stored, preventing them from scattering or becoming disorderly. This ensures that the U-shaped tubes can be accurately retrieved each time, improving the accuracy and stability of material retrieval. A limiting sliding arm 44 extending from the storage bin 41 is fixed to the side wall of the lifting platform 43. This limiting sliding arm 44 serves two purposes: firstly, it limits the rising and falling of the lifting platform 43, preventing it from rising or falling excessively under the action of elastic force, ensuring the stability and accuracy of its movement; secondly, the limiting sliding arm 44 also acts as a guide, ensuring that the lifting platform 43 can only move vertically, preventing it from shifting during movement. This ensures that the U-shaped tubes always maintain the correct stacking position, facilitating accurate pushing by the pushing structure 5. Specifically, a spring is installed on the bottom side of the lifting platform 43, so that the lifting platform 43 is elastically installed on the bottom wall of the storage tank 42. During use, as the U-shaped tube is continuously removed, the lifting platform 43 will automatically lift upward under the action of elastic force, keeping the remaining U-shaped tube at a suitable height, ensuring that the pushing structure 5 can smoothly push the bottom U-shaped tube, realizing continuous and stable material supply, eliminating the need for frequent manual adjustment of the position of the U-shaped tube, and reducing labor intensity. The pusher structure 5 includes an electric telescopic rod 51 fixed to the upper surface of the welding table 3. A pusher frame 52 is installed on the output end of the electric telescopic rod 51, and a suction cup 53 is installed at the end of the pusher frame 52. A piston assembly 6 is also provided on the welding table 3. A connecting plate 54 and a connecting rod 55, which are respectively connected to the piston assembly 6 and the shielding structure 7, are installed on the output end of the electric telescopic rod 51. Specifically, the piston assembly 6 is used in conjunction with the pusher structure 5. The piston assembly 6 includes a plug 61 provided on the upper surface of the welding table 3. The plug 61 includes a cylinder 611 fixed to the upper surface of the welding table 3. A chamber 612 is provided inside the cylinder 611, and a partition 613 is installed inside the chamber 612. A first piston 614 is provided inside the right chamber 612, and a second piston 615 is provided inside the left chamber 612. A plug rod 616 extending to the outside of the cylinder 611 is installed between the first piston 614 and the second piston 615. The end of the plug rod 616 is connected and fixed to the connecting plate 54.

[0022] To secure the suction cup 53 to the U-shaped tube, check valves 62 corresponding to the two chambers 612 are installed on the outer wall of the cylinder 611. A first connecting pipe 63 is installed at the end of the check valve 62 in the left chamber 612, and a second connecting pipe 64 is installed at the end of the check valve 62 in the right chamber 612. Specifically, the first connecting pipe 63 is fixedly connected to the push frame 52, and the second connecting pipe 64 is fixedly connected to the connecting rod 55. When the electric telescopic rod 51 extends and the push frame 52 moves forward, causing the suction cup 53 to contact the surface of the U-shaped tube, the connecting plate... 54 also pulls the stopper rod 616, thereby changing the volume of the right chamber 612. Through the combination of check valve 62, air is drawn from the first connecting pipe 63, thereby instantly creating a vacuum in the suction cup 53, firmly holding the U-shaped tube, ensuring that the U-shaped tube will not fall off or shift during the conveying process, thus improving the reliability of the conveying. A buffer spring 617 is installed between the outer surface of the stopper rod 616 and the side wall of the cylinder 611. The buffer spring 617 can absorb and disperse part of the impact force, reducing the hard collision between the stopper rod 616 and the cylinder 611. In addition, by adjusting the extension speed and stroke of the electric telescopic rod 51, the movement speed and displacement of the piston in the piston assembly 6 can be indirectly controlled, thereby flexibly adjusting the negative pressure, i.e. the suction force, in the suction cup 53. This allows the device to adapt to U-shaped tubes of different weights, materials, and sizes, expanding the applicability of the device and improving its versatility.

[0023] To improve welding performance, the shielding structure 7 and the pusher structure 5 work together in a coordinated manner. The shielding structure 7 includes two shielding plates 71 arranged vertically. Each shielding plate 71 has an extension groove 72 on one side of its opposite side, and an induction heating module 73 is installed inside the extension groove 72 of each shielding plate 71. On the same side of each shielding plate 71, there is a sliding plate 74 and two first guide wheels 77. Each of the two first guide wheels 77 is equipped with a connecting shaft 76 that is fixed to one side of each shielding plate 71. The sliding plate 74 has a guide groove 75 that rolls with the first guide wheel 77. The end of the connecting rod 55 is fixed to the side wall of the sliding plate 74. When the shielding plates 71 are closed, the extension grooves 72 cooperate to form a sealed cavity, which encloses the weld joint of the U-shaped tube and the main tube. This effectively isolates the outside air and prevents gases such as oxygen and nitrogen in the air from reacting with the high-temperature molten pool during welding, thus avoiding welding defects such as porosity, oxidation, and nitriding, thereby improving the quality and performance of the welded joint. Furthermore, the arc light generated during welding contains strong ultraviolet and infrared rays, which are extremely harmful to human eyes and skin. The shielding structure 7 can be designed to be dark or equipped with a light shield to effectively isolate the arc light, protect operators and other equipment, and prevent metal spatter and sparks generated during welding from scattering everywhere, ensuring a clean and safe working environment and avoiding fire hazards. At the same time, it can also prevent external airflow, such as fans in the workshop or wind caused by personnel movement, from interfering with the airflow of the protective gas, thereby stabilizing the protective effect.

[0024] Specifically, the welding table 3 has a guide groove 31 on its side wall to limit the movement of the slide plate 74. A slider 78, which slides in cooperation with the guide groove 31, is installed on the side wall of the slide plate 74. The slider 78 is hollow inside and has a fluid inlet 79 that communicates with the connecting rod 55. Through the reciprocating motion of the second piston 615, and in conjunction with the check valve 62, a suction function is achieved, thereby delivering lubricating oil to the guide groove 31. This ensures smooth movement of the slide plate 74 and improves the adjustment effect.

[0025] It should be noted that the guide groove 75 is inclined, and there are two extension grooves 72. The upper surface of the welding table 3 is provided with a limiting component to guide the two baffles 71. The limiting component includes a guide rod 10 fixed to the upper surface of the welding table 3. The guide rod 10 passes through the interior of the two baffles 71. The outer surface of the guide rod 10 is wrapped with a second return spring 11 fixed to the upper and lower sides of the two baffles 71. The installation of the guide rod 10 will not affect the pipe docking. The welding material to be welded will be placed in advance at the end of the U-shaped tube. In addition, the main pipe of the serpentine tube is equivalent to being embedded between the two conveying rollers 2. When the pipes are docked, they can be limited by the side of the positioning frame 1, thereby realizing the pipe docking. The induction heating module 73 generates heat directly inside the pipe wall through electromagnetic induction, eliminating the need for external flames or contact heating elements. This avoids contamination of the workpiece. Heat is directly generated inside the metal to be welded, resulting in rapid heating, a small heat-affected zone, and effectively reducing pipe oxidation and deformation. Furthermore, the welding method is "induction brazing." The principle of this application is induction brazing, where the induction heating module 73 generates eddy current heat inside the metal pipe opening, melting the solder (such as a welding ring or solder paste) pre-placed at the junction of the U-shaped pipe and the main pipe, thus achieving welding. This method eliminates the need for a traditional welding torch; the welding heat source is electromagnetic induction, and the solder is a pre-placed auxiliary material. The core of electromagnetic induction heating is the use of alternating current to generate an alternating magnetic field, inducing eddy currents inside the metal workpiece and generating heat through resistance.

[0026] Example 2, as Figure 1 and Figure 8As shown, to facilitate the subsequent feeding of U-shaped tubes, a pushing assembly 8 is provided on the side wall of the storage box 41 for use with the displacement of the sliding plate 74. The pushing assembly 8 includes an abutment seat 81 slidably disposed inside the storage box 41. An adjusting rod 82 is threadedly installed inside the abutment seat 81, and an abutment block 83 that abuts against the limiting sliding arm 44 is fixed at the bottom end of the adjusting rod 82. A guide slope 84 that rises from low to high is provided on the top side of the abutment seat 81, and a second guide wheel 710 that abuts against the guide slope 84 is installed on the bottom side of the sliding plate 74. In use, the sliding plate 74 can push the material. When structure 5 is displaced, as the slide plate 74 moves, the second guide wheel 710 mounted on its bottom side abuts against the guide ramp 84 on the top side of the abutment seat 81. As the slide plate 74 continues to move, the second guide wheel 710 rolls along the guide ramp 84, thereby pushing the abutment seat 81 downward. This downward movement of the abutment seat 81 abuts against the limiting slide arm 44 via the abutment block 83, thus lowering the raised lifting platform 43 to the bottom of the storage tank 42. This allows subsequent workers to place new U-shaped tubes into the storage tank 42, greatly improving the automation level and production efficiency of the feeding process. A spring is provided at the connection between the abutment seat 81 and the storage box 41 so that the abutment seat 81 can return to its original position above the storage box 41.

[0027] Example 3, as Figure 9 As shown, in order to further improve the shielding effect, a valve 9 is provided in the bottom shielding plate 71. The valve 9 includes a sealing block 93 provided inside the bottom shielding plate 71. The bottom shielding plate 71 has a first connecting groove 91 and a second connecting groove 92 inside. The first connecting groove 91 and the second connecting groove 92 are connected at one end and at the other end are connected to the extension groove 72 and the outside, respectively. The blocking block 93 is slidably disposed inside the first connecting groove 91, and a first return spring 94 is installed between the bottom side of the blocking block 93 and the bottom wall of the first connecting groove 91. A three-way pipe 95 is fixedly connected to the bottom side of the first connecting groove 91. The other two ends of the three-way pipe 95 are respectively connected to a gas supply device and a gas extraction device. A push rod 96 for driving the blocking block 93 is installed inside the extension groove 72 on the top baffle plate 71. During the closing process of the baffle plate 71, the push rod 96 can automatically push the blocking block 93 with the movement of the top baffle plate 71 to realize the opening or closing of the gas channel. There is no need for the operator to manually operate the valve 9, which improves the convenience and automation of operation. Specifically, before welding, a protective gas such as argon can be introduced as needed. By adjusting the sealing block 93 to open the channel, the protective gas can be fully filled into the sealed space formed by the baffle plate 71, and the air can be discharged to create a good protective atmosphere for welding. This effectively prevents the weld metal from reacting with oxygen, nitrogen and other gases in the air at high temperatures, and reduces the generation of welding defects such as porosity, oxidation and nitriding.

[0028] It is worth mentioning that the valve 9 can control the gas flow during welding to form a certain airflow, which can guide the spatter and fumes to a specific direction or discharge them from the sealed space, reducing the impact of spatter and fumes on the welding area, making the welding process clearer, facilitating operators to observe the welding situation, and promptly detect and deal with welding defects, thereby improving the welding quality.

[0029] Combined with appendix Figures 1-9 The working principle of the above embodiments is as follows: In the initial state, the electric telescopic rod 51 is in the retracted state, the baffle plate 71 is open, and the storage box 41 contains stacked U-shaped tubes. The worker places the serpentine main tube on the conveyor roller 2 and conveys it to the predetermined welding position through the roller conveyor. The electric telescopic rod 51 is started to extend, and its output end simultaneously drives three parts in linkage. First, the push frame 52 and the suction cup 53 push the bottom U-shaped tube. At the same time, the connecting plate 54 pulls the piston rod 616 of the piston assembly 6. The displacement of the first piston 614 in the piston assembly 6 changes the pressure of the right chamber 612, so that the suction cup 53 adsorbs the U-shaped tube, ensuring that it moves accurately to the welding port of the main tube. Then, the connecting rod 55 pushes the slide plate 74 to move. The movement of the slide plate 74 converts the horizontal thrust into a vertical force through the first guide wheel 77 and the inclined guide groove 75, driving the upper and lower baffles 71 to close quickly along the guide rod 10, tightly wrapping the joint to be welded between the U-shaped tube and the main tube in the cavity formed by the extension groove 72. During the closing process, the push rod 96 on the top baffle 71 presses down, pushing the sealing block 93 in the bottom baffle 71 to move down, compressing the first return spring 94, thereby opening the channel connecting the first connecting groove 91 and the second connecting groove 92. Inert protective gas is injected into the cavity through the gas supply device connected by the three-way pipe 95. Since the protective gas is denser than air, it can more effectively squeeze out the residual air by entering from the bottom. The air extraction device ensures that the air in the cavity is completely replaced, forming a high-purity protective environment. Once the protective gas concentration in the sealed chamber reaches the set requirement, the induction heating module 73 is activated to heat and weld the pipe joint area.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes, comprising two positioning frame bodies (1) and a plurality of conveying rollers (2) rotatably mounted between the two positioning frame bodies (1), characterized in that: One of the positioning frames (1) has a welding table (3) welded on its outer wall. The welding table (3) is provided with a material storage structure (4), a material pushing structure (5), and a shielding structure (7) used in conjunction with the material pushing structure (5). The pusher structure (5) includes an electric telescopic rod (51) fixed to the upper surface of the welding table (3). A pusher frame (52) is installed on the output end of the electric telescopic rod (51). A suction cup (53) is installed at the end of the pusher frame (52). A piston assembly (6) is also provided on the welding table (3). A connecting plate (54) and a connecting rod (55) are respectively connected to the piston assembly (6) and the shielding structure (7) on the output end of the electric telescopic rod (51). The shielding structure (7) is used in conjunction with the pushing structure (5). The shielding structure (7) includes two shielding plates (71) distributed vertically. Each of the two shielding plates (71) has an extension groove (72) on one side opposite to the other. An induction heating module (73) is installed inside the extension groove (72) on each of the two shielding plates (71). A sliding plate (74) and two first guide wheels (77) are provided on the same side of the two baffles (71). Each of the two first guide wheels (77) is equipped with a connecting shaft (76) that is fixed to one side of the two baffles (71). The sliding plate (74) has a guide groove (75) that rolls with the first guide wheel (77). The end of the connecting rod (55) is fixed to the side wall of the sliding plate (74).

2. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 1, characterized in that: The storage structure (4) is used to store the U-shaped head in the serpentine tube. The storage structure (4) includes a storage box (41) bolted to the welding table (3). The storage box (41) has a storage trough (42) inside, and a lifting platform (43) is elastically provided on the bottom wall of the storage trough (42). The top side of the storage box (41) is open, and the height of the storage box (41) is flush with the bottom baffle plate (71).

3. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 2, characterized in that: The lifting platform (43) has a limiting sliding arm (44) extending from the storage box (41) fixed on its side wall, and the storage box (41) has a pushing component (8) for use in conjunction with the displacement of the sliding plate (74) on its side wall.

4. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 1, characterized in that: The piston assembly (6) is used in conjunction with the pusher structure (5). The piston assembly (6) includes a plug (61) disposed on the upper surface of the welding table (3). The plug (61) includes a cylinder (611) fixed to the upper surface of the welding table (3). The cylinder (611) has a chamber (612) inside, and a partition (613) is installed inside the chamber (612). A first piston (614) is disposed inside the right chamber (612), and a second piston (615) is disposed inside the left chamber (612). A plug rod (616) extending to the outside of the cylinder (611) is installed between the first piston (614) and the second piston (615). The end of the plug rod (616) is connected and fixed to the connecting plate (54).

5. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 4, characterized in that: The outer wall of the cylinder (611) is equipped with check valves (62) corresponding to the two chambers (612) respectively. The check valve (62) on the left chamber (612) is equipped with a first connecting pipe (63) and the check valve (62) on the right chamber (612) is equipped with a second connecting pipe (64). The first connecting pipe (63) is fixedly connected to the push frame (52) and the second connecting pipe (64) is fixedly connected to the connecting rod (55).

6. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 4, characterized in that: A buffer spring (617) is installed between the outer surface of the plug rod (616) and the side wall of the cylinder (611). A guide groove (31) for limiting the sliding plate (74) is provided on the side wall of the welding table (3). A slider (78) that slides in cooperation with the guide groove (31) is installed on the side wall of the sliding plate (74). The slider (78) is hollow inside and has an infusion hole (79) that communicates with the connecting rod (55).

7. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 1, characterized in that: The guide groove (75) is inclined, and there are two extension grooves (72). The upper surface of the welding table (3) is provided with a limiting component for guiding the two shielding plates (71). The limiting component includes a guide rod (10) fixed to the upper surface of the welding table (3). The guide rod (10) passes through the interior of the two shielding plates (71). The outer surface of the guide rod (10) is provided with a second return spring (11) fixed to the upper and lower sides of the two shielding plates (71).

8. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 3, characterized in that: The pushing assembly (8) includes an abutment seat (81) slidably disposed inside the storage box (41). An adjusting rod (82) is threadedly installed inside the abutment seat (81), and an abutment block (83) is fixed at the bottom end of the adjusting rod (82) to abut against the limiting sliding arm (44). A guide slope (84) from low to high is provided on the top side of the abutment seat (81), and a second guide wheel (710) abutting against the guide slope (84) is installed on the bottom side of the sliding plate (74).

9. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 1, characterized in that: A valve (9) is provided inside the bottom baffle plate (71). The valve (9) includes a sealing block (93) disposed inside the bottom baffle plate (71). The bottom baffle plate (71) has a first connecting groove (91) and a second connecting groove (92) inside. The first connecting groove (91) and the second connecting groove (92) are connected at opposite ends and at opposite ends are connected to the extension groove (72) and the outside, respectively.

10. The fully automatic welding multi-row pipe synchronous positioning frame for serpentine pipes according to claim 9, characterized in that: The sealing block (93) is slidably disposed inside the first connecting groove (91), and a first reset spring (94) is installed between the bottom side of the sealing block (93) and the bottom wall of the first connecting groove (91). A three-way pipe (95) is fixedly connected to the bottom side of the first connecting groove (91). The other two ends of the three-way pipe (95) are respectively connected to a gas supply device and a gas extraction device. A push rod (96) for driving the sealing block (93) is installed inside the extension groove (72) on the top baffle plate (71).

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