Secondary argon filling device for welding of corrugated outer conductor of RF cable

Abstract

The invention discloses a secondary argon filling device for welding of an RF cable embossed outer conductor, and particularly relates to the technical field of welding equipment.The secondary argon filling device comprises a supporting frame, a sizing fixing seat and a welding sizing fixing frame, a welding gun and an argon tank are installed at one end of the welding sizing fixing frame, and the argon tank is used for continuously providing argon for the welding gun; a second argon filling assembly is arranged at one end of the welding sizing fixing frame and used for enabling an inner cavity of a corrugated copper pipe in the welding sizing fixing frame and the back face of a welding seam to form a stable protective atmosphere. High-purity argon is injected from the interior of the to-be-welded copper pipe through the two argon filling assemblies, so that an inner cavity of the copper pipe is filled with the high-purity argon, a protective atmosphere is formed on the back face of a welding seam, argon flowing in the copper pipe can take away part of heat conducted to the back face of metal, the key cooling effect on an insulating core wire with extremely small gaps is achieved, and the welding quality is improved. Scalding adhesion is prevented, and the welding process is more stable.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to a secondary argon purging device for welding the corrugated outer conductor of an RF cable. Background Technology

[0002] In the manufacturing process of radio frequency coaxial cables, the argon arc welding of the corrugated copper tube outer conductor is a core and critical process that determines the final performance of the product. This process uses argon arc welding technology to weld the longitudinally wrapped, circular copper strip joint into a sealed tube. The quality, density, and structural integrity of the weld directly determine the cable's mechanical strength (such as tensile strength and compressive strength) and key electrical performance (including voltage standing wave ratio, signal attenuation, and shielding effectiveness), making it a core element in ensuring the long-term stable operation of the cable. Currently, most existing argon filling equipment is used to inject argon gas into the corrugated copper tube from one side during the welding process. At the seam, during the precision cutting of copper strip, it is difficult to achieve an absolutely smooth cut edge due to processing limitations. Microscopic burrs and irregular edges are inevitably produced. However, at the high temperature of welding, the metal on the inner surface of the weld comes into contact with air and is prone to oxidation, causing the inner surface of the weld to darken and form an oxide layer, which damages the metallurgical bonding state of the weld. At the same time, the burrs at the weld can cause arc concentration and energy instability, which can lead to defects such as open weld, incomplete weld, or even pipe wall penetration. These defects affect the welding quality and structural integrity of the outer conductor of the corrugated copper tube, and ultimately affect the stability and reliability of the cable signal transmission. Summary of the Invention

[0003] The purpose of this invention is to provide a secondary argon purging device for welding the corrugated outer conductor of an RF cable, in order to overcome the above-mentioned shortcomings in the technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a secondary argon filling device for welding the corrugated outer conductor of an RF cable, comprising a support frame, a sizing fixing seat, and a welding sizing fixing frame. A welding torch and an argon gas cylinder are installed at one end of the welding sizing fixing frame, and the argon gas cylinder is used to continuously supply argon gas to the welding torch. A secondary argon filling assembly is provided at one end of the welding sizing fixing frame, and the secondary argon filling assembly is used to form a stable protective atmosphere in the inner cavity of the corrugated copper tube inside the welding sizing fixing frame and on the back of the weld.

[0005] The argon filling assembly includes a sealing ring and an argon filling connecting pipe fixedly connected to the outside of the sealing ring and communicating with its interior. The argon filling connecting pipe and the argon tank are connected together by an argon delivery pipe and a secondary argon filling flow meter. The secondary argon filling flow meter is used to control the argon gas inside the argon delivery pipe in real time. The inside of the sealing ring is fixedly connected to a wire threading bracket for guiding and moving the corrugated copper tube. The wire threading bracket is designed with a trumpet-shaped structure.

[0006] One end of the sizing fixing seat is provided with a guide component, and the guide component is used to center the corrugated copper tube into the interior of the welding sizing fixing frame and the wire threading hole frame.

[0007] A stabilizing component is provided between the support frame and the guide assembly to pre-support the corrugated copper tube, and the stabilizing component can roughen the surface of the corrugated copper tube before it moves into the guide assembly.

[0008] A support assembly is provided between the support frame and the welding sizing and fixing frame, and the support assembly is used to keep the corrugated copper tube in a horizontal state inside the welding sizing and fixing frame.

[0009] Preferably, the sealing ring has several positioning grooves on its outer side, and the welding sizing fixing frame is fixedly connected to several positioning blocks for the insertion of the several positioning grooves at one end near the sealing ring, and the positioning blocks keep the sealing ring and the welding sizing fixing frame stably in a fitted state.

[0010] A connecting bolt is provided between the sealing ring and the welding sizing fixing frame.

[0011] Preferably, the guide assembly includes a guide hole formed at one end of the sizing fixing seat and communicating with its interior, and a guide ring frame rotatably connected to one end of the sizing fixing seat. A stabilizing frame is installed at one end of the sizing fixing seat, and the guide ring frame is located between the sizing fixing seat and the stabilizing frame. Several positioning cones are connected between the guide ring frame and the stabilizing frame, and the several positioning cones are combined to form a rhomboid structure.

[0012] One end of the stabilizing frame is equipped with multiple sets of multi-dimensional components, which are used to drive several positioning cones to move synchronously.

[0013] Preferably, each of the multi-dimensional components includes a concentric column fixedly connected to one end of the stabilizing frame and a connecting sleeve movably connected to one end of the guide ring frame. The positioning cone is fixedly connected to the outside of a connecting arm, and the top of the connecting arm is movably sleeved on the outside of the concentric column. The top of the connecting sleeve is provided with a sliding hole for the connecting arm to be inserted.

[0014] One end of the guide ring frame is fixedly connected to the gear ring frame. The guide ring frame and the gear ring frame cooperate to form a hollow annular structure, and the connecting arm and the connecting sleeve are both located within the enclosed area of ​​the hollow annular structure.

[0015] The first servo motor is fixedly connected to the end of the stabilizing frame away from the gear ring frame, and the output end of the first servo motor is fixedly connected to the first gear that meshes with the gear ring frame.

[0016] Preferably, the stabilizing component includes two stabilizing seats symmetrically fixedly connected to the outside of the stabilizing frame and a concentric ring frame movably connected to one end of the stabilizing frame. A limiting groove for guiding the rotation of the concentric ring frame is provided between the two stabilizing seats. Several arc brush frames are installed inside the concentric ring frame.

[0017] Each of the aforementioned stabilizing seats and the sizing fixing seats are connected by a bolt. A second servo motor is fixedly connected to one side of one of the stabilizing seats. A second gear is fixedly connected to the output end of the second servo motor. A gear ring frame that meshes with the second gear is fixedly connected to one end of the concentric ring frame.

[0018] Each of the arc brush holders and the concentric ring holders is connected by a resilient component, which enables the arc brush holders and the outside of the corrugated copper tubes to self-adjust.

[0019] Preferably, the elastic component includes a connecting rod fixedly connected to the outside of the arc brush holder and an adaptation groove formed inside the concentric ring frame for the connecting rod to be inserted, and a return spring is connected between the connecting rod and the adaptation groove.

[0020] Preferably, the support assembly includes an auxiliary frame fixedly connected to the top of the support frame and a base plate fixedly connected to one side of the auxiliary frame. Two symmetrical side rods are fixedly connected to one side of the base plate, and the two side rods correspond to the output end of the sealing ring.

[0021] The auxiliary frame is equipped with a first side plate and a second side plate on the side near the bottom plate. Two driving rollers are movably connected to one side of the first side plate, and three driven rollers are movably connected to one side of the second side plate.

[0022] A stabilizing assembly is provided between the auxiliary frame and the first side plate.

[0023] Preferably, the stabilizing assembly includes a slider fixedly connected to the side of the first side plate near the auxiliary frame, and a spring groove is provided on one side of the auxiliary frame for guiding the slider to move. A supporting spring is connected between the spring groove and the slider.

[0024] The top of the second side plate is fixedly connected with two symmetrical concentric rods, and the top of the first side plate is provided with two concentric grooves for the two concentric rods to be inserted.

[0025] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0026] 1. This invention injects high-purity argon gas into the copper tube to be welded through a dual-fill argon gas assembly, filling the internal cavity of the copper tube and forming a protective atmosphere on the back side of the weld. The argon gas flowing inside the copper tube can carry away some of the heat conducted to the back side of the metal, playing a crucial cooling role for the insulation core wire with extremely small gaps, preventing it from being burned and sticking together. At the same time, the stable back atmosphere also helps to suppress the instability of arc energy caused by burrs and other reasons, and the continuous airflow can expel the air that may seep into the joint during welding, ensuring the reliability of the protective effect and effectively preventing the oxidation reaction of the metal on the inner surface of the weld at high temperatures, making the welding process more stable.

[0027] 2. This invention forms a rhomboid positioning state on the outer periphery of the copper tube by four positioning cones, which provides a uniformly distributed support force for the corrugated copper tube, effectively preventing the copper tube from deforming or becoming elliptical under high-speed transportation. The rhomboid distribution of support points matches the nodes of the crests and troughs of the corrugations, which can provide stable support without damaging the fragile corrugated structure, and form a precise radial constraint on the corrugated copper tube during transportation, thereby improving the stability of copper tube transportation.

[0028] 3. The present invention prepositions the copper tube by positioning cone blocks, and after the copper tube is positioned, a uniform horn-shaped ventilation gap is formed between the copper tube and the wire hole frame. This ensures that after high-purity argon is injected from the equipment, it can diffuse evenly along the horn-shaped channel and smoothly enter the interior of the copper tube. This avoids local airflow velocity being too fast or stagnation caused by uneven gaps. All-round protection can be achieved without increasing the flow rate. Without reducing the protection effect, the consumption of argon is significantly reduced and the utilization efficiency of argon is improved.

[0029] 4. This invention uses an arc brush holder to pre-clean the surface of the wrinkled copper tube, removing oxide scale and dust to create a clean surface for subsequent welding. At the same time, the multi-point support structure of the positioning cone block inside the stabilizing frame provides initial guidance for the copper tube, ensuring that its axis is aligned with the center of the diamond-shaped channel of the positioning cone block. This creates a synergistic effect of pre-cleaning, guiding, and precise positioning, ensuring that the copper tube is already clean and its axis is aligned with the height of the diamond-shaped channel when it enters the positioning cone block area, laying a stable foundation for subsequent operations.

[0030] 5. This invention uses a concentric ring frame to rotate, causing the arc brush frame to rotate around the outer circumference of the copper tube. An elastic component provides elastic self-adaptation between the arc brush frame and the copper tube, allowing the arc brush frame to conform to the shape of the copper tube. When contacting the copper tube, the pressure can be automatically adjusted according to the undulation of the corrugations, forming a gentle cleaning force at the contact points with equal height at the crests. This ensures the cleaning effect without squeezing or scratching the corrugations. At the same time, the circumferential rotation cleaning method disperses the single-point pressure into a uniform frictional force in the circumferential direction, avoiding corrugation damage caused by local pressure concentration. This provides better surface conditions for subsequent argon gas delivery and argon arc welding, further improving the quality of the weld.

[0031] 6. This invention utilizes the coordinated operation of the active roller, driven roller, side rod, and sealing ring to provide multi-point support for the welded copper tube. This ensures that the copper tube enters the wire threading frame and welding area at a uniform speed and in a stable manner. This allows the copper tube to be stably conveyed in conjunction with the continuous argon supply during secondary argon filling. The argon injection volume is precisely matched with the copper tube conveying speed, maintaining a stable inert atmosphere concentration inside the copper tube. This reduces thermal stress concentration and avoids defects such as copper tube corrugation deformation, weld cracking, or incomplete fusion caused by uneven cooling. It also ensures that the weld and copper tube corrugation structure are compatible, achieving a dynamic synergy between stable conveying and continuous protection.

[0032] 7. This invention, through the arrangement of active rollers, driven rollers, and stabilizing components, provides multi-point support for copper tubes across multiple short distances near the first and second side plates. The evenly distributed active and driven rollers apply a stable supporting force to the copper tubes from the outer periphery, providing stable support for long-distance or large-diameter copper tubes and preventing sagging deformation due to their own weight. At the same time, the flexible contact characteristics of the active and driven rollers are not limited by the corrugation shape. Whether the copper tubes have annular or spiral patterns, they can obtain stable support without damaging the corrugated structure, further improving the continuity of copper tube welding. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0034] Figure 1 This is a schematic diagram of the overall structure of the sizing and fixing seat of the present invention;

[0035] Figure 2 For the present invention Figure 1 Enlarged view of section A in the image;

[0036] Figure 3 This is a schematic diagram of the argon-filled connecting tube of the present invention;

[0037] Figure 4 This is a cross-sectional view of the argon-filled connecting pipe of the present invention;

[0038] Figure 5 This is an exploded view of the guiding component of the present invention;

[0039] Figure 6 This is a schematic diagram of the connecting arm of the present invention;

[0040] Figure 7 This is a schematic diagram of the arc brush holder of the present invention;

[0041] Figure 8 This is a schematic diagram of the side rod structure of the present invention;

[0042] Figure 9 This is a schematic diagram of the slider of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Support frame; 11. Sizing fixing seat; 12. Welding sizing fixing frame; 13. Welding torch; 14. Argon gas cylinder;

[0045] 2. Secondary argon filling assembly; 21. Sealing ring; 22. Argon filling connecting pipe; 23. Argon delivery pipe; 24. Secondary argon filling flow meter; 25. Fixing bolt; 26. Wiring hole bracket; 27. Positioning groove; 28. Positioning block;

[0046] 3. Guide assembly; 31. Guide ring frame; 32. Guide hole; 33. Stabilizing frame; 34. Positioning cone block; 35. Concentric column; 36. Connecting arm; 37. Connecting sleeve; 38. Sliding hole; 39. Gear ring frame; 301. First gear; 302. First servo motor;

[0047] 4. Stabilizing components; 41. Stabilizing base; 42. Bolts; 43. Concentric ring frame; 44. Gear ring frame; 45. Limiting groove; 46. Second servo motor; 47. Second gear; 48. Arc brush holder;

[0048] 5. Elastic component; 51. Adaptive groove; 52. Return spring; 53. Connecting rod;

[0049] 6. Support assembly; 61. Auxiliary frame; 62. First side plate; 63. Second side plate; 64. Base plate; 65. Side rod; 66. Driven roller; 67. Driven roller;

[0050] 7. Stable connection component; 71. Concentric groove; 72. Concentric rod; 73. Spring groove; 74. Slider; 75. Support spring. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] This invention provides, for example Figure 1 , Figure 2 , Figure 3 and Figure 4The device shown is a secondary argon filling device for welding the corrugated outer conductor of an RF cable. It includes a support frame 1, a sizing fixing seat 11, and a welding sizing fixing frame 12. A welding torch 13 and an argon gas tank 14 are installed at one end of the welding sizing fixing frame 12. The argon gas tank 14 is used to continuously supply argon gas to the welding torch 13. A secondary argon filling assembly 2 is provided at one end of the welding sizing fixing frame 12. The secondary argon filling assembly 2 is used to form a stable protective atmosphere in the inner cavity of the corrugated copper tube inside the welding sizing fixing frame 12 and on the back of the weld.

[0053] The secondary argon filling assembly 2 includes a sealing ring 21 and an argon filling connecting pipe 22 fixedly connected to the outside of the sealing ring 21 and communicating with its interior. The argon filling connecting pipe 22 and the argon tank 14 are connected together by an argon delivery pipe 23 and a secondary argon filling flow meter 24. The secondary argon filling flow meter 24 is used to control the argon gas inside the argon delivery pipe 23 in real time. The sealing ring 21 is fixedly connected to a wire hole bracket 26 for guiding and moving the corrugated copper tube. The wire hole bracket 26 is designed with a trumpet-shaped structure.

[0054] refer to Figure 2 , Figure 3 and Figure 4 As shown, the sealing ring 21 has several positioning grooves 27 on its outer side. The welding sizing fixing frame 12 is fixedly connected to one end near the sealing ring 21 with several positioning blocks 28 for the positioning grooves 27 to be inserted into. The positioning blocks 28 keep the sealing ring 21 and the welding sizing fixing frame 12 stably in a fitted state. The sealing ring 21 and the welding sizing fixing frame 12 are threadedly fixed by fixing bolts 25, which facilitates the quick installation of the sealing ring 21 and the welding sizing fixing frame 12. The number of positioning grooves 27 and the number of positioning blocks 28 are the same, five in each case. This is used to pre-position the sealing ring 21 before it is installed with the welding sizing fixing frame 12, ensuring a stable connection between the sealing ring 21 and the welding sizing fixing frame 12, and improving the ease of installation of the sealing ring 21 and the welding sizing fixing frame 12.

[0055] A connecting bolt 25 is provided between the sealing ring 21 and the welding sizing fixing bracket 12;

[0056] refer to Figure 3 and Figure 4 As shown, the top of the support frame 1 also includes a forming mold, so that during the preparation stage, the insulated core wire is passed through the entire equipment along the cable travel direction, and the copper strip is wrapped around the outside of the insulated core wire by the longitudinal forming mold to form a circular copper tube with a longitudinal seam. Moreover, the argon filling connecting pipe 22 is equipped with a secondary argon filling nozzle with an orifice diameter of 1.8-2.2 mm and a diameter length of about 2 mm, which can effectively improve the argon injection speed and enable the argon to reach the surface of the insulated core wire and the inner surface of the copper strip.

[0057] refer to Figure 5 and Figure 6 As shown, one end of the sizing fixing seat 11 is provided with a guide component 3, and the guide component 3 is used to center the corrugated copper tube into the interior of the welding sizing fixing frame 12 and the wire threading hole frame 26.

[0058] The guide assembly 3 includes a guide hole 32 that is opened at one end of the sizing fixing seat 11 and communicates with its interior, and a guide ring frame 31 that is rotatably connected to one end of the sizing fixing seat 11. A stabilizing frame 33 is installed at one end of the sizing fixing seat 11, and the guide ring frame 31 is located between the sizing fixing seat 11 and the stabilizing frame 33. Several positioning cones 34 are connected between the guide ring frame 31 and the stabilizing frame 33, and the several positioning cones 34 are combined to form a rhomboid structure.

[0059] refer to Figure 5 and Figure 6 As shown, one end of the stabilizing frame 33 is provided with multiple sets of multi-dimensional components, and the multi-dimensional components are used to drive several positioning cones 34 to move synchronously.

[0060] Each multi-dimensional component includes a concentric column 35 fixedly connected to one end of the stabilizing frame 33 and a connecting sleeve 37 movably connected to one end of the guide ring frame 31. The positioning cone block 34 is fixedly connected to a connecting arm 36, and the top of the connecting arm 36 is movably sleeved on the outside of the concentric column 35. The top of the connecting sleeve 37 is provided with a sliding hole 38 for the connecting arm 36 to be inserted.

[0061] One end of the guide ring frame 31 is fixedly connected to the gear ring frame 39. The guide ring frame 31 and the gear ring frame 39 cooperate to form a hollow annular structure, and the connecting arm 36 and the connecting sleeve 37 are both located within the enclosed area of ​​the hollow annular structure. The number of the positioning cones 34 is four, and the four positioning cones 34 are arranged around the stabilizer 33 and the guide ring frame 31. The gear ring frame 39 has teeth on its outside, and both ends of the gear ring frame 39 are protruding. After the gear ring frame 39 is installed with the guide ring frame 31 and the stabilizer 33, the teeth on the outside of the gear ring frame 39 can maintain a tight meshing state with the first gear 301.

[0062] The first servo motor 302 is fixedly connected to the end of the stabilizing frame 33 away from the gear ring frame 39, and the output end of the first servo motor 302 is fixedly connected to the first gear 301 that meshes with the gear ring frame 39.

[0063] refer to Figure 5 , Figure 6 and Figure 7 As shown, a stabilizing component 4 is provided between the support frame 1 and the guide assembly 3 for pre-supporting the corrugated copper tube, and the stabilizing component 4 can roughen the surface of the corrugated copper tube before it moves into the guide assembly 3.

[0064] The stabilizing component 4 includes two stabilizing seats 41 symmetrically fixedly connected to the outside of the stabilizing frame 33 and a concentric ring frame 43 movably connected to one end of the stabilizing frame 33. A limiting groove 45 is provided between the two stabilizing seats 41 to guide the rotation of the concentric ring frame 43. Several arc brush frames 48 are installed inside the concentric ring frame 43.

[0065] Each stabilizing seat 41 and the sizing fixing seat 11 are connected by a bolt 42. A second servo motor 46 is fixedly connected to one side of one of the stabilizing seats 41. A second gear 47 is fixedly connected to the output end of the second servo motor 46. A gear ring 44 that meshes with the second gear 47 is fixedly connected to one end of the concentric ring frame 43.

[0066] refer to Figure 5 and Figure 7 As shown, each arc brush holder 48 and the concentric ring frame 43 are connected by an elastic component 5, and the elastic component 5 is used to enable the arc brush holder 48 to self-adaptively adjust to the outside of the corrugated copper tube; the elastic component 5 includes a connecting rod 53 fixedly connected to the outside of the arc brush holder 48 and an adaptation groove 51 opened inside the concentric ring frame 43 for the connecting rod 53 to be inserted, and a return spring 52 is connected between the connecting rod 53 and the adaptation groove 51.

[0067] refer to Figure 8 and Figure 9 As shown, a support assembly 6 is provided between the support frame 1 and the welding sizing fixing frame 12, and the support assembly 6 is used to keep the corrugated copper tube in a horizontal state inside the welding sizing fixing frame 12; the support assembly 6 includes an auxiliary frame 61 fixedly connected to the top of the support frame 1 and a base plate 64 fixedly connected to one side of the auxiliary frame 61. Two symmetrical side rods 65 are fixedly connected to one side of the base plate 64, and the two side rods 65 correspond to the output end of the sealing ring 21.

[0068] The auxiliary frame 61 is equipped with a first side plate 62 and a second side plate 63 on the side near the base plate 64. Two driving rollers 66 are movably connected to one side of the first side plate 62, and three driven rollers 67 are movably connected to one side of the second side plate 63.

[0069] refer to Figure 8 and Figure 9 As shown, a stabilizing assembly 7 is provided between the auxiliary frame 61 and the first side plate 62. The stabilizing assembly 7 includes a slider 74 fixedly connected to the side of the first side plate 62 near the auxiliary frame 61. A spring groove 73 is provided on one side of the auxiliary frame 61 for guiding the slider 74 to move. A support spring 75 is connected between the spring groove 73 and the slider 74.

[0070] The top of the second side plate 63 is fixedly connected with two symmetrical concentric rods 72, and the top of the first side plate 62 is provided with two concentric grooves 71 for the two concentric rods 72 to be inserted.

[0071] Working principle:

[0072] When using:

[0073] refer to Figure 5 , Figure 6 and Figure 7 As shown, when the corrugated copper tube needs to be guided and conveyed into the welding sizing fixture 12, and the front end of the corrugated copper tube is located inside the wire threading bracket 26, the corrugated copper tube is first fitted and inserted between the three arc brush brackets 48. Then, the three arc brush brackets 48 perform a rough cleaning operation on the outer circumference of the horizontally conveyed copper tube to reduce the adsorption of impurities on the surface of the copper tube, laying the foundation for the subsequent welding process. Next, the second servo motor 46 is started, driving the second gear 47 to rotate synchronously. After the second gear 47 rotates, it forms a meshing transmission cooperation with the gear ring bracket 44, thereby driving the concentric ring bracket 43 to rotate circumferentially along one end of the stabilizing bracket 33. As the concentric ring bracket 43 continues to rotate, it synchronously drives the arc brush brackets 48. The arc brush holder 48 rotates around the outer circumference of the copper tube, and during its rotation, it is arranged in an alternating manner with the outer circumference of the copper tube. After the arc brush holder 48 forms a contact fit with the outer circumference of the copper tube, it is pushed upward by the reaction force of the copper tube and guided to slide upward along the inside of the spring groove 73. When the arc brush holder 48 moves upward, it simultaneously drives the connecting rod 53 to move in a corresponding manner along the inside of the adaptation groove 51, so that the return spring 52 is elastically squeezed and stored between the adaptation groove 51 and the connecting rod 53. At the same time, the return spring 52 applies a downward elastic push to the top of the connecting rod 53 through its own elastic deformation, so that the arc brush holder 48 always maintains an elastic adaptive contact state with the outer circumference of the copper tube, ensuring the stability and comprehensiveness of the coarse cleaning operation.

[0074] refer to Figure 5 and Figure 6 As shown, when it is necessary to guide the corrugated copper tube into the welding sizing fixing frame 12, the first servo motor 302 starts and drives the first gear 301 to rotate synchronously; then the first gear 301 and the gear ring frame 39 form a meshing transmission, which drives the guide ring frame 31 to rotate along one end of the guide hole 32. Then, the rotation of the guide ring frame 31 drives the connecting sleeve 37 to rotate synchronously; during the rotation of the connecting sleeve 37, it forms a contact fit with the outside of the connecting arm 36 and rotates relative to the inside of the guide ring frame 31 to realize the angle adjustment of the connecting sleeve 37. While the angle of the connecting sleeve 37 is adjusted, the inner hole of its sliding hole 38 and the outside of the connecting arm 36 maintain a contact constraint; under the contact limit of the sliding hole 38, the connecting arm 36 makes a circular motion along the outside of the concentric column 35, thereby driving the connecting arm 36 to swing along one end of the stabilizing frame 33. During the swing of the connecting arm 36, the sliding hole 38 slides and adapts along the outside of the connecting arm 36.

[0075] refer to Figure 1 , Figure 5 and Figure 6As shown, with the swing of the connecting arm 36, the positioning cone 34 approaches the outer periphery of the copper tube along the reserved space between the guide ring frame 31 and the gear ring frame 39. Similarly, as the guide ring frame 31 continues to rotate, it drives the other three positioning cones 34 to move towards the outer periphery of the copper tube in sync. Finally, the four positioning cones 34 form a surrounding constraint on the copper tube at the front end of the guide hole 32, realizing the pre-positioning of the copper tube before it passes through the guide hole 32 and the sizing fixing seat 11, ensuring the stability and accuracy of the subsequent guiding movement of the copper tube.

[0076] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, when the corrugated copper tube is guided and transported into the welding sizing and fixing frame 12, and the front end of the copper tube extends into the wire hole frame 26, the copper strip first completely wraps into a circle and then presents a V-shaped structure. Argon gas rushes in at the end of the V-shape. Then, just before the copper strip enters the welding sizing and fixing frame 12 and is about to be welded, the secondary argon filling switch on the surface of the support frame 1 is activated, and the flow rate is set to 3-5L / min. High-purity argon gas (purity ≥99.99%) passes through the argon delivery pipe 23 and the secondary argon filling flow meter 24 in sequence. Then, the argon delivery pipe 23 inputs the argon gas inside it into the argon filling connecting pipe 22. Subsequently, the argon filling connecting pipe 22 injects the argon gas inside it into the annular cavity formed by the copper tube and the internal insulated core wire through its own argon filling nozzle. Since the injected argon gas is heavier than air, it will quickly fill and replace the air inside the copper tube.

[0077] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, immediately following, the sealing ring 21 maintains a distance of 1.5-2.5mm between itself and the inside of the copper tube or the insulated core wire through the wire guide bracket 26. Its main function is not absolute sealing, but rather to slow down the gas flow rate, ensuring the formation and maintenance of an argon-rich environment near the welding point, rather than allowing the gas to escape rapidly. At this time, the area on the back of the weld is filled with inert protective gas. Thus, when the joint of the copper tube moves to below the welding torch 13, the welding torch 13 is activated to perform argon arc welding. The argon flow rate of the welding torch 13 is 10-15L / min. At this time, the welding area... Simultaneously protected by the front annular argon gas flow (primary argon) from the welding torch nozzle 13 and the back argon atmosphere (secondary argon) from inside the copper tube, the secondary argon purging protection system must not be shut off immediately after welding. It must be shut off 3-5 seconds after the machine stops. The purpose of this delayed shutdown design is to prevent the weld root from contacting air and undergoing rapid oxidation at high temperature (which will remain at high temperature for a long time after welding). This ensures effective gas sealing protection during welding without adversely affecting weld formation.

[0078] refer to Figure 8and Figure 9 As shown, when the copper tube weld is completed and it remains in a horizontal moving state, the subsequent guiding support and argon gas protection process is as follows: After the welded copper tube passes through the inside of the sealing ring 21, it is directionally guided between the two side rods 65; the two side rods 65 form a lateral limit on the outer periphery of the copper tube, ensuring that the copper tube is accurately guided into the clamping space formed by the two active rollers 66 and the three driven rollers 67. Subsequently, the active rollers 66 and the driven rollers 67 cooperate to achieve stable guiding and conveying of the copper tube; at the same time, the active rollers 66, the driven rollers 67, the side rods 65 and the sealing ring 21 form a multi-point cooperative support structure to provide all-round support for the welded copper tube, avoiding deformation or positional displacement of the copper tube due to the high temperature after welding. When the copper tube is guided into the gap between the active rollers 66 and the driven rollers 67, the outer periphery of the copper tube forms an abutting fit with the active rollers 66, thereby pushing the first side plate 62 to slide upward along the top of the second side plate 63.

[0079] refer to Figure 8 and Figure 9 As shown, when the first side plate 62 moves, it simultaneously drives the concentric groove 71 to move directionally along the outside of the concentric rod 72. The cooperation between the concentric rod 72 and the concentric groove 71 precisely limits the movement direction of the first side plate 62. During this process, the first side plate 62 drives the slider 74 to slide upward along the inside of the spring groove 73, so that the support spring 75 is elastically stretched and stores force between the slider 74 and the spring groove 73. At the same time, the support spring 75 applies a downward elastic force to the bottom of the slider 74 through its own elastic deformation, so that the first side plate 62 and the second side plate 63 maintain a suitable relative distance, thereby ensuring that the active roller 66 and the driven roller 67 maintain a stable clamping distance. This ensures that the copper tube can pass smoothly through the gap between the two, and provides reliable structural support for the stable delivery of argon gas inside the copper tube, avoiding obstruction of the argon gas delivery channel due to the displacement of the copper tube.

[0080] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A secondary argon-filling device for welding the corrugated outer conductor of an RF cable, comprising a support frame (1), a sizing fixing seat (11), and a welding sizing fixing frame (12), wherein a welding torch (13) and an argon gas cylinder (14) are mounted at one end of the welding sizing fixing frame (12), and the argon gas cylinder (14) is used to continuously supply argon gas to the welding torch (13), characterized in that: One end of the welding sizing fixture (12) is provided with a double argon gas assembly (2), and the double argon gas assembly (2) is used to form a stable protective atmosphere in the inner cavity of the corrugated copper tube and the back of the weld inside the welding sizing fixture (12). The argon filling assembly (2) includes a sealing ring (21) and an argon filling connecting pipe (22) fixedly connected to the outside of the sealing ring (21) and communicating with its interior. The argon filling connecting pipe (22) and the argon tank (14) are connected together by an argon delivery pipe (23) and a secondary argon filling flow meter (24). The secondary argon filling flow meter (24) is used to control the argon gas inside the argon delivery pipe (23) in real time. The sealing ring (21) is fixedly connected to a wire hole frame (26) for guiding and moving the corrugated copper tube. The wire hole frame (26) is designed as a trumpet-shaped structure. One end of the sizing fixing seat (11) is provided with a guide component (3), and the guide component (3) is used to center the corrugated copper tube into the interior of the welding sizing fixing frame (12) and the wire hole frame (26); A stabilizing component (4) for pre-supporting the corrugated copper tube is provided between the support frame (1) and the guide assembly (3), and the stabilizing component (4) can roughen the surface of the corrugated copper tube before it moves into the guide assembly (3). A support assembly (6) is provided between the support frame (1) and the welding sizing fixing frame (12), and the support assembly (6) is used to keep the corrugated copper tube in a horizontal state inside the welding sizing fixing frame (12).

2. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 1, characterized in that: The sealing ring (21) has several positioning grooves (27) on its outside. The welding sizing fixing frame (12) is fixedly connected to a number of positioning blocks (28) for the insertion of the several positioning grooves (27) at one end near the sealing ring (21). The positioning blocks (28) keep the sealing ring (21) and the welding sizing fixing frame (12) stably in a fitted state. A connecting bolt (25) is provided between the sealing ring (21) and the welding sizing fixing bracket (12).

3. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 1, characterized in that: The guide assembly (3) includes a guide hole (32) opened at one end of the sizing fixing seat (11) and communicating with its interior, and a guide ring frame (31) rotatably connected to one end of the sizing fixing seat (11). A stabilizing frame (33) is installed at one end of the sizing fixing seat (11), and the guide ring frame (31) is located between the sizing fixing seat (11) and the stabilizing frame (33). Several positioning cones (34) are connected between the guide ring frame (31) and the stabilizing frame (33), and the several positioning cones (34) are combined to form a rhomboid structure. One end of the stabilizing frame (33) is provided with multiple sets of multi-dimensional components, and the multi-dimensional components are used to drive several positioning cones (34) to move synchronously.

4. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 3, characterized in that: Each of the multi-dimensional components includes a concentric column (35) fixedly connected to one end of the stabilizing frame (33) and a connecting sleeve (37) movably connected to one end of the guide ring frame (31). The positioning cone (34) is fixedly connected to a connecting arm (36), and the top of the connecting arm (36) is movably sleeved on the outside of the concentric column (35). The top of the connecting sleeve (37) is provided with a sliding hole (38) for the connecting arm (36) to be inserted. One end of the guide ring frame (31) is fixedly connected to the gear ring frame (39). The guide ring frame (31) and the gear ring frame (39) cooperate to form a hollow ring structure, and the connecting arm (36) and the connecting sleeve (37) are both located within the enclosed area of ​​the hollow ring structure. The first servo motor (302) is fixedly connected to one end of the stabilizing frame (33) away from the gear ring frame (39), and the output end of the first servo motor (302) is fixedly connected to a first gear (301) that meshes with the gear ring frame (39).

5. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 4, characterized in that: The stabilizing component (4) includes two stabilizing seats (41) symmetrically fixedly connected to the outside of the stabilizing frame (33) and a concentric ring frame (43) movably connected to one end of the stabilizing frame (33). A limiting groove (45) for guiding the rotation of the concentric ring frame (43) is provided between the two stabilizing seats (41). Several arc brush frames (48) are installed inside the concentric ring frame (43). Each of the stabilizers (41) and the sizing fixation seat (11) is connected by a bolt (42). A second servo motor (46) is fixedly connected to one side of one of the stabilizers (41). A second gear (47) is fixedly connected to the output end of the second servo motor (46). A gear ring (44) that meshes with the second gear (47) is fixedly connected to one end of the concentric ring frame (43). Each of the arc brush holders (48) and the concentric ring holders (43) are connected together by an elastic component (5), and the elastic component (5) is used to enable the arc brush holders (48) to self-adjust with the outside of the corrugated copper tube.

6. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 5, characterized in that: The elastic component (5) includes a connecting rod (53) fixedly connected to the outside of the arc brush holder (48) and an adaptation groove (51) opened inside the concentric ring frame (43) for the connecting rod (53) to be inserted. A return spring (52) is connected between the connecting rod (53) and the adaptation groove (51).

7. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 1, characterized in that: The support assembly (6) includes an auxiliary frame (61) fixedly connected to the top of the support frame (1) and a base plate (64) fixedly connected to one side of the auxiliary frame (61). Two symmetrical side rods (65) are fixedly connected to one side of the base plate (64), and the two side rods (65) correspond to the output end of the sealing ring (21). The auxiliary frame (61) is equipped with a first side plate (62) and a second side plate (63) on the side near the base plate (64). Two active rollers (66) are movably connected to one side of the first side plate (62), and three driven rollers (67) are movably connected to one side of the second side plate (63). A stabilizing assembly (7) is provided between the auxiliary frame (61) and the first side plate (62).

8. The secondary argon purging device for welding the corrugated outer conductor of an RF cable according to claim 7, characterized in that: The stabilizing assembly (7) includes a slider (74) fixedly connected to the side of the first side plate (62) near the auxiliary frame (61). A spring groove (73) is provided on one side of the auxiliary frame (61) for guiding the slider (74) to move. A support spring (75) is connected between the spring groove (73) and the slider (74). The top of the second side plate (63) is fixedly connected with two symmetrical concentric rods (72), and the top of the first side plate (62) is provided with two concentric grooves (71) for the two concentric rods (72) to be inserted.

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