A longitudinal seam welding device for metal hose preform and a welding method thereof

Abstract

This invention discloses a longitudinal seam welding device and method for metal flexible tube blanks, belonging to the technical field of welding equipment. The longitudinal seam welding device for metal flexible tube blanks of this invention includes an L-shaped metal base; a welding worktable mounted on one side of the top of the L-shaped metal base by screws; welding equipment mounted on the top of the L-shaped metal base; an automated welding device mounted on the top of the welding worktable; and an assembled guide weld structure mounted at the center inside the welding worktable and located on the side of the automated welding device. In this invention, the tube blank can be installed and positioned from two dimensions: axial clamping and fixing, and radial clamping and correction. This corrects the deformable ends during welding back to a standard circle, while simultaneously limiting the radial deformation of the tube blank when heated, thereby significantly improving the dimensional stability and consistency after welding and enhancing the welding effect on metal flexible tube blanks.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding device and welding method for longitudinal seams of metal flexible tube blanks. Background Technology

[0002] Metal flexible hose blanks are the core raw material for manufacturing metal flexible hoses. They can also be used to produce industrial pipe fittings such as corrugated pipes, corrugated pipe compensators, and cable conduits. They are mainly made of stainless steel and other metal materials. The longitudinal seam welding of the metal flexible hose blank is the core forming step in the welded tube blank manufacturing process. This process has significant advantages in production efficiency, cost control, and dimensional adaptability, making it particularly suitable for manufacturing large-diameter flexible hose blanks to meet various production needs.

[0003] A longitudinal seam welding device, with application publication number CN121551989A, includes a base and a reference plate mounted thereon, a welding device, a rotating device, a lifting device, and an adjusting device. The rotating device supports the workpiece to be welded. The lifting plate of the lifting device has a liftable positioning column, which is hollow and filled with a cooling medium. Its side walls have mounting grooves and welding grooves, and a light curtain area sensor is installed in the mounting groove. The adjusting device can drive the positioning column to translate and rotate. This invention, by driving the positioning column to perform a combined translation and rotation motion through the adjusting device, combined with a reference plate with adjustable heat insulation and a welding device with stable feed, constitutes a complete automated longitudinal seam welding solution, achieving full-process automation and precise control from centering and clamping to welding.

[0004] However, this welding device has the following drawbacks in practical use: 1. When welding the tubing blank of a metal flexible hose, because the material of the tubing blank needs to be welded in a ring shape, it is difficult to ensure perfect alignment between the tubing blank and the connector when welding manually. Even slight shaking can cause the tubing blank to misalign, creating stress concentration points and making it difficult to achieve precise docking of the metal flexible hose blank. At the same time, the high temperature generated during welding causes the metal flexible hose blank to expand, then contract upon cooling. This internal stress can cause cracking and out-of-roundness at the weld joint of the ring-shaped hose, making it difficult to ensure the dimensional stability and consistency of the metal flexible hose blank after welding. 2. When welding the tube blank of a metal flexible hose, impurities from the device can easily adhere to the tube blank during the joining process. These impurities decompose or vaporize upon heating during subsequent welding, producing gases (such as hydrogen, oxygen, and water vapor). These gases form pores inside or on the surface of the weld seam, reducing the weld's density and strength, and making the metal flexible hose blank more prone to cracking. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device and welding method for longitudinal seams of metal flexible tube blanks, so as to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: This invention provides a longitudinal seam welding device for metal flexible tube blanks, comprising: an L-shaped metal base; a welding worktable mounted on one side of the top of the L-shaped metal base by screws; welding equipment mounted on the top of the L-shaped metal base; an automated welding device mounted on the top of the welding worktable; an assembled guide weld structure mounted at the center inside the welding worktable and located on the side of the automated welding device; and a tube blank extrusion spraying device mounted at the center of the bottom of the welding worktable and located below the assembled guide weld structure. The tube blank extrusion spraying device includes: a central roller structure mounted on the side of the L-shaped metal base by screws and located below the welding worktable; a tube blank longitudinal seam extrusion positioning structure installed inside the central roller structure and extending to the top outer side; a first gear installed outside the tube blank longitudinal seam extrusion positioning structure; tube blank side extrusion structures meshing with the first gear and movably arranged on the left and right sides of the central roller structure; a transmission belt connected to the tube blank longitudinal seam extrusion positioning structure via a synchronous pulley and movably arranged inside the central roller structure; and a pressurized spraying structure connected to the inner side of the transmission belt via a synchronous pulley and installed at the center inside the welding worktable. The pressurized spray structure is located inside the assembled guide weld structure.

[0007] As a preferred embodiment of the present invention, the automated welding apparatus includes: A metal base is mounted on the top of the welding workbench by screws. A linear drive source is mounted on the side of the metal base. The output end of the linear drive source is connected to a horizontal reciprocating lead screw. A reciprocating slide is connected to the outer side of the horizontal reciprocating lead screw via ball bearings. The reciprocating slide is slidably connected to the outside of the metal base, and the reciprocating slide is slidably connected to the first guide rail mounted on the front of the metal base; An L-shaped connecting plate is mounted and fixed to the side of the reciprocating slide. A lifting drive source is installed on the inner side of the L-shaped connecting plate, and a welding generator is connected to the output end of the lifting drive source. The welding generator is slidably connected to the side of the second guide rail, which is mounted on the side of the L-shaped connecting plate.

[0008] As a preferred embodiment of the present invention, a cleaning outer protective sleeve is provided on the outer side of the laser emitting end of the welding generator, and the cleaning outer protective sleeve extends to the outer side of the assembled guide weld structure. A drying instrument is installed on the side of the laser emitting end of the welding generator, and a supplementary light is connected to the side of the outer shell of the welding generator through a metal bending tube. The supplementary light is positioned facing the laser emitting end of the welding generator.

[0009] As a preferred embodiment of the present invention, the assembled guide weld structure includes: The intermediate weld groove is located at the center of the inside of the welding workbench. Side metal blocks are installed on the left and right sides of the inside of the intermediate weld groove by screws, and two adjacent side metal blocks are snapped together. An arc-shaped metal block is mounted on the inner side of the side metal block by screws, with a welding gap between adjacent arc-shaped metal blocks, and the bottom of the arc-shaped metal block is set as a flat surface. The inner side of the arc-shaped metal block is equipped with a pressurized spray structure, and the bottom of the arc-shaped metal block is provided with a central roller structure.

[0010] As a preferred embodiment of the present invention, the central roller structure includes: The lower base is installed on both sides of the bottom of the welding workbench. A metal outer shell is installed inside the lower base, and a metal inner shell is installed inside the metal outer shell. The top of the metal outer shell is set as a plane, and the interior of the metal inner shell is equipped with a tube blank longitudinal seam extrusion positioning structure that extends to the outside of the metal outer shell; An intermediate base is installed at the center inside the metal outer casing, and a first gear is rotatably connected at the center of the intermediate base.

[0011] As a preferred embodiment of the present invention, the tube blank longitudinal seam extrusion positioning structure includes: A servo drive source is installed inside the lower body. The output end of the servo drive source is connected to a linear rotary rod, which is movably positioned at the center inside the metal inner housing. An outer cylinder is movably disposed on the outside of the linear rotating rod. A one-way ratchet is rotatably connected to the outside of the outer cylinder, and the one-way ratchet is mounted on the outside of the linear rotating rod. The outer cylinder is disposed on the left and right sides of the intermediate base, and the outer cylinder is movably disposed inside the metal inner shell; A limiting block is provided on the side of the one-way ratchet and is movably connected to the left and right sides of the outer cylinder. The limiting block is connected to the output end of the electric telescopic rod installed on the side of the outer cylinder. An eccentric turntable is mounted on the outside of the outer cylinder. The outer surface of the eccentric turntable has multiple inwardly recessed grooves. A movable connecting rod extending to the outside of the inner metal shell abuts against the outer surface of the eccentric turntable. The movable connecting rod is fitted with a return spring on its outer side, and the return spring is connected to the inner side of the metal inner shell. A support baffle is connected to the top of the movable connecting rod. The support baffle is slidably connected to the inner top of the metal outer shell and supports and positions the tube blank at the top.

[0012] In a preferred embodiment of the present invention, a plurality of positioning holes are provided on one side of the outer cylinder, and a positioning block is provided inside the positioning hole. The positioning block is connected to the output end of the horizontal cylinder, and the horizontal cylinder is installed at an eccentric position at the bottom of the intermediate base. The linear rotor has a first gear mounted on its outer side, and a transmission belt connected to its bottom via a synchronous pulley.

[0013] As a preferred embodiment of the present invention, the tube blank-side extrusion structure includes: A transmission gear is meshed with the outside of the first gear. Multiple transmission gears are provided, with adjacent transmission gears meshing with each other. An external gear meshes with the side of each transmission gear. The external gear has a side rotating rod that is movably disposed on the left and right sides of the metal outer shell. A side positioning body is installed on the outside of the side rotating rod by screws. The side positioning body is movably disposed on the outside of the metal outer shell. The top of the side positioning body supports and positions the tube blank.

[0014] As a preferred embodiment of the present invention, the pressurized spray structure includes: A liquid storage tank assembly is installed inside the arc-shaped metal block. The top space of the liquid storage tank assembly is configured as a liquid storage space. A linear reciprocating screw is rotatably connected to the center of the bottom of the liquid storage tank assembly. A telescopic slider is connected to the outer side of the linear reciprocating screw via ball bearings. The telescopic slider is movably disposed at the inner bottom of the liquid storage tank assembly. The outer side of the bottom of the linear reciprocating screw is connected to a transmission belt via a synchronous pulley; A horizontal rod is installed eccentrically inside the telescopic slider, extending into the liquid storage space inside the liquid storage tank assembly. A pressure piston is installed at the bottom of the horizontal rod, and the pressure piston is movably disposed within the liquid storage space of the liquid storage tank assembly. The pressurizing piston has a one-way valve installed at its internal center, the top of the liquid storage tank group has a liquid inlet that communicates with the liquid storage space, and the side of the liquid storage tank group has a liquid outlet. A bottom seat is mounted on the side of the liquid storage tank assembly. A steering drive source is installed on one side of the bottom seat. The output end of the steering drive source is connected to a movable rotating block rotatably connected to the inside of the bottom seat. A high-pressure atomizing nozzle is installed on the side of the movable rotating block. The high-pressure atomizing nozzle is connected to the liquid discharge nozzle via a hose.

[0015] The present invention also provides a method for longitudinal seam welding of a metal flexible tube blank, comprising the following steps: S1. Tube blank positioning: The tube blank end portion to be welded is moved to the top of the tube blank extrusion spraying device by manual assembly, and the tube blank end portion is pressed against the bottom of the assembled guide weld structure by activating the tube blank extrusion spraying device to install and position the tube blank to be welded. S2. Cleaning of the tube blank welding surface: When the welding part of the tube blank is limited and fixed by the tube blank extrusion spraying device, the cleaning liquid is sprayed onto the surface of the tube blank by spraying the welding part of the tube blank. S3. Welding of the tube blank: When welding the tube blank, start the automated welding device to perform tungsten inert gas welding on the tube blank. While the tube blank is being horizontally welded, the surface of the tube blank is wiped and cleaned simultaneously to improve the welding effect of the metal hose tube blank.

[0016] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. In the longitudinal seam welding device and method for metal flexible tube blanks, when performing longitudinal seam welding on the port portion (welding surface) of an annular metal flexible tube blank, the servo drive source can be activated to move the support baffle at the top of the metal shell upwards and downwards, pressing the welding surface of the tube blank (vertically) against the top of the support baffle, thus aligning the welding surface of the tube blank with the bottom of the arc-shaped metal block, facilitating the longitudinal seam welding operation. Simultaneously, the driving force for moving the support baffle upwards and downwards can also drive the side positioning body to rotate via gear transmission, providing side support and positioning for the side of the tube blank near the longitudinal seam welding. This allows for installation and positioning of the tube blank from both axial clamping and radial clamping and correction dimensions. On one hand, it provides a uniform and stable clamping force circumferentially, forcibly correcting the deformed port back to a standard circle; on the other hand, it continuously provides resistance during the welding process, limiting the radial deformation of the tube blank when heated, thereby significantly improving the dimensional stability and consistency after welding. It should be noted that the structure that drives the support baffle is connected to the servo drive source through a retractable ratchet. Depending on the requirements, one or two support baffles can be driven to move up and down, and one or two metal hose blanks can be welded at the same time, thereby improving the efficiency of welding metal hose blanks. 2. In the longitudinal seam welding device and method for metal flexible tube blanks, when welding the longitudinal seam portion of the metal flexible tube blank, the lifting and lowering force of the support baffle drives the atomized cleaning fluid to be sprayed onto the welding surface of the tube blank. This atomized spraying of cleaning fluid onto the welding surface facilitates the removal of impurities adhering to the welding surface of the tube blank during subsequent longitudinal seam welding, thanks to the horizontal movement of the welding generator. This improves surface cleanliness and significantly reduces the probability of defects such as porosity, slag inclusions, cracks, and lack of fusion during welding, thereby increasing the density and strength of the weld. Simultaneously, it prevents contaminants from being drawn into the weld or heat-affected zone during welding, reducing local component segregation and inclusions. This lowers the risk of pitting corrosion, crevice corrosion, or stress corrosion cracking in the weld area during use, improving the welding effect on the metal flexible tube blank. 3. In the longitudinal seam welding device and method for metal flexible tube blanks, an automated welding device can automatically perform welding (longitudinal seam welding) on ​​the positioned metal flexible tube blanks, improving the efficiency of welding. Simultaneously, a cleaning outer protective sleeve installed on the outside of the laser generating end of the welding generator matches the inner space of the side metal block, ensuring that the cleaning outer protective sleeve can move inside the side metal block to clean impurities adhering to the surface of the metal flexible tube blank. Combined with a drying instrument, the cleaned surface of the metal flexible tube blank can be dried, reducing water residue on the welding surface and improving the welding effect. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall main view of the present invention; Figure 3 This is a schematic diagram of the overall front view of the present invention; Figure 4 This is a top view of the overall structure of the invention; Figure 5 This is a schematic diagram of the overall side view of the present invention; Figure 6 This is a schematic diagram of the main structure of the automated welding device of the present invention; Figure 7 This is a bottom-view structural schematic diagram of the automated welding device of the present invention; Figure 8 This is a schematic diagram of the connection between the welding workbench and the tube blank extrusion spraying device of the present invention; Figure 9 This is the present invention. Figure 8 Enlarged structural diagram of region A in the middle; Figure 10 This is an exploded view of the connection between the welding workbench and the assembled guide weld structure of the present invention; Figure 11 This is a cross-sectional structural diagram showing the connection between the welding workbench and the tube blank extrusion spraying device of the present invention; Figure 12 This is a front cross-sectional view of the welding workbench and tube blank extrusion spraying device of the present invention. Figure 13 This is a schematic diagram showing the connection between the central roller structure and the tube blank longitudinal seam extrusion positioning structure of the present invention. Figure 14 This is an exploded view of the connection between the central roller structure and the tube blank longitudinal seam extrusion positioning structure of the present invention. Figure 15 This is a schematic diagram of the connection between the linear rotating rod and the tube blank side extrusion structure of the present invention; Figure 16 This is a schematic diagram showing the connection between the tube blank longitudinal seam extrusion positioning structure and the pressurized spraying structure of the present invention. In the picture: 10. L-shaped metal base; 20. Welding workbench; 30. Welding equipment; 40. Automated welding device; 401. Metal base; 4011. First guide rail; 402. Linear drive source; 403. Horizontal reciprocating lead screw; 404. Reciprocating slide; 405. L-shaped connecting plate; 406. Lifting drive source; 407. Welding generator; 4071. Cleaning outer protective sleeve; 4072. Drying instrument; 4073. Metal bending tube; 4074. Supplemental light; 408. Second guide rail; 50. Assembled guide weld structure; 501. Intermediate weld groove; 502. Side metal block; 503. Arc-shaped metal block; 60. Tube blank extrusion spraying device; 601. Central roller structure; 602. Tube blank longitudinal seam extrusion positioning structure; 603. First gear; 604. Tube blank side extrusion structure; 605. Drive belt; 606. Pressurized spraying structure; 6011. Lower base; 6012. Metal outer shell; 6013. Metal inner shell; 6014. Intermediate base; 6021 Servo drive source; 6022 Linear rotary rod; 6023 Outer cylinder; 60231 Positioning hole; 60232 Positioning block; 60233 Horizontal cylinder; 6024 One-way ratchet; 6025 Limit stop; 6026 Electric telescopic rod; 6027 Eccentric turntable; 60271 Embedded groove; 6028 Movable connecting rod; 60281 Return spring; 6029 Support baffle; 6041. Transmission gear; 6042. External gear; 6043. Side rotating rod; 6044. Side positioning body; 6061, Liquid storage tank assembly; 60611, Liquid inlet; 60612, Liquid outlet; 6062, Linear reciprocating screw; 6063, Telescopic slider; 6064, Horizontal bar; 6065, Pressure piston; 60651, Check valve; 6066, Bottom seat; 6067, Steering drive source; 6068, Movable rotating block; 6069, High-pressure atomizing nozzle. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] Example 1 Please see Figures 1-16 A metal hose blank longitudinal seam welding device includes an L-shaped metal base 10; a welding worktable 20 mounted on the top side of the L-shaped metal base 10 by screws; a welding device 30 mounted on the top of the L-shaped metal base 10; an automated welding device 40 mounted on the top of the welding worktable 20; an assembled guide weld structure 50 mounted at the center inside the welding worktable 20 and located on the side of the automated welding device 40; and a blank extrusion spraying device 60 mounted at the center bottom of the welding worktable 20 and located below the assembled guide weld structure 50. The blank extrusion spraying device 60 includes a central roller structure mounted on the side of the L-shaped metal base 10 and located below the welding worktable 20 by screws. 601; a tube blank longitudinal seam extrusion positioning structure 602 installed inside the central roller structure 601 and extending to the top outer side; a first gear 603 installed outside the tube blank longitudinal seam extrusion positioning structure 602; a tube blank side extrusion structure 604 meshing with the first gear 603 and movably arranged on the left and right sides of the central roller structure 601; a transmission belt 605 connected to the tube blank longitudinal seam extrusion positioning structure 602 via a synchronous pulley and movably arranged inside the central roller structure 601; a pressurized spray structure 606 connected to the inner side of the transmission belt 605 via a synchronous pulley and installed at the center inside the welding workbench 20, wherein the pressurized spray structure 606 is arranged inside the assembled guide weld structure 50.

[0022] The working principle is as follows: When longitudinally welding the metal hose blank, the worker extends the welded portion of the metal hose blank to the top of the central roller structure 601. Then, the longitudinal seam extrusion and positioning structure 602 is activated to support the welded portion of the metal hose blank and press it to the bottom of the assembled guide weld structure 50. Simultaneously, the longitudinal seam extrusion and positioning structure 602 also drives the first gear 603 mounted on its outer side, which in turn drives the tube blank side extrusion structures 604 connected to the left and right sides of the first gear 603 to extrude and position the side wall portion of the tube blank near the welded portion. Furthermore, while the longitudinal seam extrusion and positioning structure 602 is operating, it also drives the pressurized spray structure 606 connected to the synchronous pulley inside the transmission belt 605 via a transmission belt 605, pressurizing and spraying cleaning fluid onto the welded surface of the metal hose blank. During welding, the automated welding device 40 is activated to move the welding probe (laser emitter) to the top of the tube blank welding surface and achieves a straight and automated weld operation by driving the probe (laser emitter) to operate horizontally.

[0023] It should be noted that when the automated welding device 40 is welding the metal hose blanks, the sprayed cleaning liquid can be wiped and applied to clean the impurities adhering to the welding surface, so as to avoid the impurities affecting the welding effect during welding.

[0024] For details, please refer to the following: Figure 5 and Figure 6 The automated welding device 40 includes a metal base 401, which is mounted on the top of the welding workbench 20 by screws. A linear drive source 402 is mounted on the side of the metal base 401. The output end of the linear drive source 402 is connected to a horizontal reciprocating screw 403. A reciprocating slide 404 is connected to the outer side of the horizontal reciprocating screw 403 by ball bearings. The reciprocating slide 404 is slidably connected to the outer side of the metal base 401. The reciprocating slide 404 is slidably connected to a first guide rail 4011 mounted on the front side of the metal base 401. An L-shaped connecting plate 405 is mounted and fixed on the side of the reciprocating slide 404. A lifting drive source 406 is mounted on the inner side of the L-shaped connecting plate 405. The output end of the lifting drive source 406 is connected to a welding generator 407. The welding generator 407 is slidably connected to the side of a second guide rail 408, which is mounted on the side of the L-shaped connecting plate 405.

[0025] In this design, a cleaning outer protective sleeve 4071 is provided on the outer side of the laser emitting end of the welding generator 407. The cleaning outer protective sleeve 4071 extends to the outer side of the assembled guide weld structure 50. A drying instrument 4072 is installed on the side of the laser emitting end of the welding generator 407. A supplementary light 4074 is connected to the side of the outer shell of the welding generator 407 through a metal bending tube 4073. The supplementary light 4074 is positioned towards the laser emitting end of the welding generator 407.

[0026] In the longitudinal seam welding device for metal flexible tube blanks of the present invention, when performing longitudinal seam welding operation on the metal flexible tube blank, the linear drive source 402 is started to operate, driving the horizontal reciprocating screw 403 connected to the output end of the linear drive source 402 to rotate, and driving the reciprocating slide 404 connected to the outside of the horizontal reciprocating screw 403 by ball bearings to move reciprocally in the horizontal direction, thereby adjusting the position of the welding generator 407 in the horizontal direction.

[0027] By activating the lifting drive source 406, the welding generator 407 connected to the output end of the lifting drive source 406 is moved up and down, and the position and height of the welding end at the bottom of the welding generator 407 are adjusted to bring it close to the welding surface for welding processing.

[0028] The outer protective sleeve 4071 is designed to wipe and apply cleaning fluid adhering to the welding surface, thus cleaning the welding surface; the drying instrument 4072 dries the wiped and applied welding surface; and the supplementary light 4074 provides sufficient light to the welding surface, making it convenient for workers to place the welding surface at the bottom of the assembled guide weld structure 50.

[0029] For details, please refer to the following: Figure 10 The assembled guide weld structure 50 includes a central weld groove 501, which is located at the center of the welding workbench 20. Side metal blocks 502 are installed on the left and right sides of the central weld groove 501 by screws, and adjacent side metal blocks 502 are snapped together. An arc-shaped metal block 503 is installed on the inner side of the side metal blocks 502 by screws. A gap for welding is left between adjacent arc-shaped metal blocks 503. The bottom of the arc-shaped metal block 503 is set as a plane. A pressurized spray structure 606 is installed on the inner side of the arc-shaped metal block 503, and a central roller structure 601 is set at the bottom of the arc-shaped metal block 503.

[0030] In the longitudinal seam welding device for metal flexible tube blanks of the present invention, the design of the arc-shaped metal block 503 guides the horizontally moving cleaning outer protective sleeve 4071, ensuring that the cleaning outer protective sleeve 4071 moves in a straight line to perform longitudinal seam welding; the bottom plane of the cleaning outer protective sleeve 4071 abuts against the surface of the tube blank, positioning the welding surface of the tube blank.

[0031] For details, please refer to the following: Figure 14 The central roller structure 601 includes a lower base 6011, which is installed on both sides of the bottom of the welding workbench 20. A metal outer shell 6012 is installed inside the lower base 6011, and a metal inner shell 6013 is installed inside the metal outer shell 6012. The top of the metal outer shell 6012 is set as a plane, and a tube blank longitudinal seam extrusion positioning structure 602 extending to the outside of the metal outer shell 6012 is installed inside the metal inner shell 6013. An intermediate base 6014 is installed at the center inside the metal outer shell 6012, and a first gear 603 is rotatably connected at the center inside the intermediate base 6014.

[0032] For details, please refer to the following: Figure 12 , Figure 13 and Figure 14 The tube blank longitudinal seam extrusion positioning structure 602 includes a servo drive source 6021, which is installed inside the lower base 6011. The output end of the servo drive source 6021 is connected to a linear rotary rod 6022, which is movably disposed at the center inside the inner metal shell 6013. An outer cylinder 6023 is movably disposed outside the linear rotary rod 6022. A one-way ratchet 6024 is rotatably connected to the outer side of the outer cylinder 6023, which is installed outside the linear rotary rod 6022. The outer cylinder 6023 is disposed on the left and right sides of the intermediate base 6014 and movably disposed inside the inner metal shell 6013. A limiting stop 6025 is disposed on the side of the one-way ratchet 6024 and movably connected to the outer cylinder. On the left and right sides of body 6023, limit blocks 6025 are connected to the output ends of electric telescopic rods 6026 installed on the side of outer cylinder 6023; eccentric turntable 6027 is installed on the outside of outer cylinder 6023, and multiple inwardly recessed embedding grooves 60271 are provided on the outside of eccentric turntable 6027. The outside of eccentric turntable 6027 abuts against a movable connecting rod 6028 extending to the outside of metal inner shell 6013. A return spring 60281 is sleeved on the outside of movable connecting rod 6028 and connected to the inside of metal inner shell 6013; support baffle 6029 is connected to the top of movable connecting rod 6028 and slidably connected to the inner top of metal outer shell 6012, and supports and positions the tube blank at the top.

[0033] In the longitudinal seam welding device for metal flexible tube blanks of the present invention, when supporting and positioning the welding surface of the tube blank, the servo drive source 6021 is started to operate, driving the linear rotating rod 6022 connected to the output end of the servo drive source 6021 to rotate, and causing the one-way ratchet 6024 installed on the outside of the linear rotating rod 6022 to rotate. When the one-way ratchet 6024 rotates, the position of the limit stop 6025 at the output end of the electric telescopic rod 6026 can be adjusted by activating the electric telescopic rod 6026. When the limit stop 6025 and the one-way ratchet 6024 are engaged, the rotation of the one-way ratchet 6024 can drive the outer cylinder 6023 to rotate. The eccentric turntable 6027 installed on the outside of the outer cylinder 6023 and the arc of the embedded groove 60271 opened inside the eccentric turntable 6027 drive the movable connecting rod 6028 embedded in the groove 60271 and in contact with the eccentric turntable 6027 to move up and down. The position and height of the support baffle 6029 installed on the top of the movable connecting rod 6028 are adjusted, and it abuts against the tube blank welding surface on the top of the support baffle 6029, thus positioning the tube blank welding surface between the support baffle 6029 and the arc-shaped metal block 503.

[0034] For details, please refer to the following: Figure 13 The outer cylinder 6023 has several positioning holes 60231 on one side. Positioning blocks 60232 are installed inside the positioning holes 60231. The positioning blocks 60232 are connected to the output end of the horizontal cylinder 60233. The horizontal cylinder 60233 is installed at the eccentric position at the bottom of the intermediate base 6014. The first gear 603 is installed on the outer side of the linear rotating rod 6022. The bottom of the linear rotating rod 6022 is connected to the transmission belt 605 through the synchronous pulley.

[0035] In the longitudinal seam welding device for metal flexible tube blanks of the present invention, when the welding surface of the tube blank is supported and positioned, the horizontal cylinder 60233 is started to operate, which drives the positioning block 60232 connected to the output end of the horizontal cylinder 60233 to move telescopically. When the positioning block 60232 moves into the interior of the positioning hole 60231, the position of the outer cylinder 6023 is limited and fixed.

[0036] For details, please refer to the following: Figure 15The tube blank side extrusion structure 604 includes a transmission gear 6041, which is meshed with the outside of the first gear 603. Multiple transmission gears 6041 are provided, and two adjacent transmission gears 6041 are meshed with each other. An external gear 6042 is meshed with the side of the transmission gear 6041. The external gear 6042 has a side rotating rod 6043 that is movably disposed on the left and right sides of the metal outer shell 6012 through and fixed inside. A side positioning body 6044 is installed on the outside of the side rotating rod 6043 by screws. The side positioning body 6044 is movably disposed on the outside of the metal outer shell 6012. The top of the side positioning body 6044 supports and positions the tube blank.

[0037] In the longitudinal seam welding device for metal flexible tube blanks of the present invention, when the first gear 603 rotates due to the rotation of the linear rotating rod 6022, it can drive the transmission gear 6041, which is meshed with the side of the first gear 603, to rotate. When the transmission gear 6041 rotates, the external gear 6042, which is meshed with the side of the transmission gear 6041, will rotate, driving the side rotating rod 6043, which is installed through the external gear 6042, to rotate. This causes the side positioning body 6044, which is installed on the outside of the side rotating rod 6043, to rotate, thereby laterally squeezing the metal flexible tube blank that is in contact with the top of the side positioning body 6044, and realizing the support and positioning operation of the metal flexible tube blank.

[0038] For details, please refer to the following: Figure 9 and Figure 16The pressurized spray structure 606 includes a liquid storage tank assembly 6061, which is installed inside the arc-shaped metal block 503. The top space of the liquid storage tank assembly 6061 is configured as a liquid storage space. A linear reciprocating screw 6062 is rotatably connected to the center of the bottom of the liquid storage tank assembly 6061. A telescopic slider 6063 is connected to the outer side of the linear reciprocating screw 6062 via ball bearings. The telescopic slider 6063 is movably disposed at the inner bottom of the liquid storage tank assembly 6061. A transmission belt 605 is connected to the outer side of the bottom of the linear reciprocating screw 6062 via a synchronous pulley. A horizontal rod 6064 is installed at an eccentric position inside the telescopic slider 6063 and extends into the liquid storage space inside the liquid storage tank assembly 6061. A pressurized piston 6065 is installed at the bottom of the horizontal rod 6064. A pressurizing piston 6065 is movably disposed within the liquid storage space of the liquid storage tank assembly 6061. A one-way valve 60651 is installed at the center of the pressurizing piston 6065. A liquid inlet 60611 connected to the liquid storage space is installed on the top of the liquid storage tank assembly 6061. A liquid outlet 60612 is installed on the side of the liquid storage tank assembly 6061. A bottom seat 6066 is installed on the side of the liquid storage tank assembly 6061. A steering drive source 6067 is installed on one side of the bottom seat 6066. The output end of the steering drive source 6067 is connected to a movable rotating block 6068 rotatably connected to the inside of the bottom seat 6066. A high-pressure atomizing nozzle 6069 is installed on the side of the movable rotating block 6068. The high-pressure atomizing nozzle 6069 is connected to the liquid outlet 60612 via a hose.

[0039] In the longitudinal seam welding device for metal hose preforms of the present invention, when the linear rotary rod 6022 rotates, the linear reciprocating screw 6062 connected to its bottom outer side via a synchronous wheel rotates, causing the telescopic slider 6063 connected to the outer side of the linear reciprocating screw 6062 via ball bearings to move horizontally. When the telescopic slider 6063 moves horizontally, it drives the pressure piston 6065, which is mounted on its eccentric part via a horizontal rod 6064, to move horizontally within the liquid storage tank group 6061, pressurizing the cleaning fluid outside the pressure piston 6065. This allows the cleaning fluid to be transmitted through the liquid discharge nozzle 60612 to the interior of the high-pressure atomizing nozzle 6069, and then atomized and sprayed out from the interior of the high-pressure atomizing nozzle 6069 to spray the welding surface of the metal hose preform.

[0040] It should be noted that the cleaning fluid can be transferred to the storage space inside the storage tank group 6061 through the liquid inlet 60611; the direction and angle of the cleaning fluid sprayed by the high-pressure atomizing nozzle 6069 can be adjusted by starting the steering drive source 6067 to operate, thereby driving the movable rotating block 6068 and the high-pressure atomizing nozzle 6069 connected to the output end of the steering drive source 6067 to rotate.

[0041] Example 2 Please see Figures 1-16 A method for longitudinal seam welding of a metal flexible tube blank includes the following steps: S1. Tube blank positioning: The tube blank end portion to be welded is moved to the top of the tube blank extrusion spraying device 60 by manual assembly, and the tube blank end portion is pressed against the bottom of the assembled guide weld structure 50 by starting the tube blank extrusion spraying device 60 to install and position the tube blank to be welded. S2. Cleaning of the tube blank welding surface: When the tube blank welding part is limited and fixed by the tube blank extrusion spraying device 60, the cleaning liquid is sprayed onto the surface of the tube blank by spraying the welding part of the tube blank. S3. Welding of the tube blank: When welding the tube blank, start the automated welding device 40 to perform tungsten inert gas welding on the tube blank. While the tube blank is being horizontally welded, the surface of the tube blank is wiped and cleaned simultaneously to improve the welding effect of the metal hose tube blank.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0043] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0044] Therefore, any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this invention, based on the technical solution and inventive concept of this invention, should be covered within the protection scope of this invention.

Claims

1. A welding device for longitudinal seams of metal flexible tube blanks, characterized in that, include: L-shaped metal base (10); welding workbench (20) mounted on the top side of the L-shaped metal base (10) by screws; welding equipment (30) mounted on the top of the L-shaped metal base (10); automated welding device (40) mounted on the top of the welding workbench (20); assembled guide weld structure (50) mounted at the center inside the welding workbench (20) and located on the side of the automated welding device (40); tube blank extrusion spraying device (60) mounted at the center bottom of the welding workbench (20) and located below the assembled guide weld structure (50). The tube blank extrusion spraying device (60) includes: a central roller structure (601) mounted on the side of the L-shaped metal base (10) by screws and located below the welding worktable (20); a tube blank longitudinal seam extrusion positioning structure (602) installed inside the central roller structure (601) and extending to the top outer side; a first gear (603) installed outside the tube blank longitudinal seam extrusion positioning structure (602); a tube blank side extrusion structure (604) meshing with the first gear (603) and movably arranged on the left and right sides of the central roller structure (601); a transmission belt (605) connected to the tube blank longitudinal seam extrusion positioning structure (602) via a synchronous pulley and movably arranged inside the central roller structure (601); and a pressurized spraying structure (606) connected to the inside of the transmission belt (605) via a synchronous pulley and installed at the center inside the welding worktable (20). The pressurized spray structure (606) is located inside the assembled guide weld structure (50).

2. The longitudinal seam welding device for metal flexible tube blanks according to claim 1, characterized in that: The automated welding device (40) includes: A metal seat (401) is mounted on the top of the welding workbench (20) by screws. A linear drive source (402) is mounted on the side of the metal seat (401). The output end of the linear drive source (402) is connected to a horizontal reciprocating screw (403). A reciprocating slide (404) is connected to the outer side of the horizontal reciprocating screw (403) by ball bearings. The reciprocating slide (404) is slidably connected to the outside of the metal seat (401), and the reciprocating slide (404) is slidably connected to the first guide rail (4011) installed on the front of the metal seat (401). L-shaped connecting plate (405), the L-shaped connecting plate (405) is fixed on the side of the reciprocating slide (404), and a lifting drive source (406) is installed on the inner side of the L-shaped connecting plate (405). The output end of the lifting drive source (406) is connected to a welding generator (407). The welding generator (407) is slidably connected to the side of the second guide rail (408), which is mounted on the side of the L-shaped connecting plate (405).

3. The longitudinal seam welding device for metal flexible tube blanks according to claim 2, characterized in that: The outer side of the laser emitting end of the welding generator (407) is fitted with a cleaning outer protective sleeve (4071), which extends to the outer side of the assembled guide weld structure (50). A drying instrument (4072) is installed on the side of the laser emitting end of the welding generator (407), and a supplementary light (4074) is connected to the side of the outer shell of the welding generator (407) through a metal bending tube (4073). The supplementary light (4074) is set towards the laser emitting end of the welding generator (407).

4. The longitudinal seam welding device for metal flexible tube blanks according to claim 1, characterized in that: The assembled guide weld structure (50) includes: The intermediate weld groove (501) is located at the center inside the welding workbench (20). Side metal blocks (502) are installed on the left and right sides inside the intermediate weld groove (501) by screws, and two adjacent side metal blocks (502) are snapped together. An arc-shaped metal block (503) is mounted on the inner side of the side metal block (502) by screws. A welding gap is left between two adjacent arc-shaped metal blocks (503). The bottom of the arc-shaped metal block (503) is set as a flat surface. The inner side of the arc-shaped metal block (503) is equipped with a pressurized spray structure (606), and the bottom of the arc-shaped metal block (503) is provided with a central roller structure (601).

5. The longitudinal seam welding device for metal flexible tube blanks according to claim 1, characterized in that: The central roller structure (601) includes: The lower seat (6011) is installed on both sides of the bottom of the welding workbench (20). A metal outer shell (6012) is installed on the inner side of the lower seat (6011), and a metal inner shell (6013) is installed inside the metal outer shell (6012). The top of the metal outer shell (6012) is set as a plane, and the interior of the metal inner shell (6013) is equipped with a tube blank longitudinal seam extrusion positioning structure (602) extending to the outside of the metal outer shell (6012). An intermediate base (6014) is installed at the center inside the metal outer shell (6012), and a first gear (603) is rotatably connected at the center inside the intermediate base (6014).

6. The longitudinal seam welding device for metal flexible tube blanks according to claim 5, characterized in that: The tube blank longitudinal seam extrusion positioning structure (602) includes: A servo drive source (6021) is installed inside the lower body (6011). The output end of the servo drive source (6021) is connected to a linear rotary rod (6022). The linear rotary rod (6022) is movably disposed at the center inside the metal inner shell (6013). An outer cylinder (6023) is movably disposed on the outside of a linear rotating rod (6022). A one-way ratchet (6024) is rotatably connected to the outside of the outer cylinder (6023). The one-way ratchet (6024) is mounted on the outside of the linear rotating rod (6022). The outer cylinder (6023) is disposed on the left and right sides of the intermediate base (6014), and the outer cylinder (6023) is movably disposed inside the metal inner shell (6013); A limiting block (6025) is provided on the side of the one-way ratchet (6024) and is movably connected to the left and right sides of the outer cylinder (6023). The limiting block (6025) is connected to the output end of the electric telescopic rod (6026) installed on the side of the outer cylinder (6023). An eccentric turntable (6027) is installed on the outside of the outer cylinder (6023). The eccentric turntable (6027) has multiple inwardly recessed embedding grooves (60271) on its outer side. The outer side of the eccentric turntable (6027) abuts against a movable connecting rod (6028) extending to the outside of the metal inner shell (6013). Among them, a return spring (60281) is sleeved on the outer side of the movable connecting rod (6028), and the return spring (60281) is connected to the inner side of the metal inner shell (6013); A support baffle (6029) is connected to the top of the movable connecting rod (6028). The support baffle (6029) is slidably connected to the inner top of the metal outer shell (6012) and supports and positions the tube blank at the top.

7. The longitudinal seam welding device for metal flexible tube blanks according to claim 6, characterized in that: The outer cylinder (6023) has several positioning holes (60231) on one side. Positioning blocks (60232) are installed inside the positioning holes (60231). The positioning blocks (60232) are connected to the output end of a horizontal cylinder (60233). The horizontal cylinder (60233) is installed at an eccentric position at the bottom of the intermediate base (6014). The linear rotary rod (6022) has a first gear (603) mounted on its outer side, and the bottom of the linear rotary rod (6022) is connected to a transmission belt (605) via a synchronous pulley.

8. The longitudinal seam welding device for metal flexible tube blanks according to claim 7, characterized in that: The tube blank-side extrusion structure (604) includes: A transmission gear (6041) is meshed with the outside of the first gear (603). Multiple transmission gears (6041) are provided, and two adjacent transmission gears (6041) are meshed with each other. An external gear (6042) is meshed with the side of the transmission gear (6041). Among them, the external gear (6042) has a side rotating rod (6043) that is movably arranged on the left and right sides of the metal outer shell (6012) through and fixed inside. A side positioning body (6044) is installed on the outside of the side rotating rod (6043) by screws. The side positioning body (6044) is movably disposed on the outside of the metal outer shell (6012). The top of the side positioning body (6044) supports and positions the tube blank.

9. The longitudinal seam welding device for metal flexible tube blanks according to claim 4, characterized in that: The pressurized spray structure (606) includes: A liquid storage tank assembly (6061) is installed inside the arc-shaped metal block (503). The top space of the liquid storage tank assembly (6061) is configured as a liquid storage space. A linear reciprocating screw (6062) is rotatably connected to the center of the bottom of the liquid storage tank assembly (6061). A telescopic slider (6063) is connected to the outer side of the linear reciprocating screw (6062) via ball bearings. The telescopic slider (6063) is movably disposed at the inner bottom of the liquid storage tank assembly (6061). The outer side of the bottom of the linear reciprocating screw (6062) is connected to a transmission belt (605) via a synchronous pulley. A horizontal rod (6064) is installed at an eccentric position inside the telescopic slider (6063). The horizontal rod (6064) extends into the liquid storage space inside the liquid storage tank assembly (6061). A pressure piston (6065) is installed at the bottom of the horizontal rod (6064), and the pressure piston (6065) is movably disposed within the liquid storage space of the liquid storage tank assembly (6061). The pressurizing piston (6065) has a one-way valve (60651) installed at its internal center, the liquid storage tank group (6061) has a liquid inlet (60611) connected to the liquid storage space installed on its top, and a liquid outlet (60612) is installed on the side of the liquid storage tank group (6061). A bottom seat (6066) is installed on the side of the liquid storage tank assembly (6061). A steering drive source (6067) is installed on one side of the bottom seat (6066). The output end of the steering drive source (6067) is connected to a movable rotating block (6068) rotatably connected to the inside of the bottom seat (6066). A high-pressure atomizing nozzle (6069) is installed on the side of the movable rotating block (6068). The high-pressure atomizing nozzle (6069) is connected to the liquid discharge nozzle (60612) via a hose.

10. A method for longitudinal seam welding of a metal flexible tube blank, relating to the longitudinal seam welding apparatus for a metal flexible tube blank as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Tube blank positioning: The tube blank end part to be welded is moved to the top of the tube blank extrusion spray device (60) by manual assembly, and the tube blank end part is pressed against the bottom of the assembled guide weld structure (50) by starting the tube blank extrusion spray device (60) to install and position the tube blank to be welded. S2. Cleaning of the tube blank welding surface: When the tube blank welding part is limited and fixed by the tube blank extrusion spraying device (60), the cleaning liquid is sprayed onto the surface of the tube blank by spraying the welding part of the tube blank. S3. Welding of tube blank: When welding the tube blank, start the automated welding device (40) to perform tungsten inert gas welding on the tube blank. When welding the tube blank horizontally, wipe and clean the surface of the tube blank to improve the welding effect of the metal hose tube blank.

Images