High-precision automatic wire-feeding device for inverter DC arc welder

Abstract

The application discloses a high-precision automatic wire feeding device for an inverter DC arc welding machine, and particularly relates to the technical field of welding machine parts. The application adopts a fixed-point wire feeding mode, and the welding wire does not need to rotate at an angle, and the pressure pipeline is rotated to realize circular welding. First, the preheating unit is lowered in height, and the preheating ring sleeve one and the preheating ring sleeve two are away from each other. Once the pusher is pushed, the end of the pressure pipeline smoothly enters the preheating ring sleeve one and the preheating ring sleeve two to be fully preheated in advance, so that the temperature difference stress in the initial welding stage is reduced. The preheating ring sleeve one and the preheating ring sleeve two are separated from the ends of the pressure pipelines under the elastic reset of the elastic element by the secondary rotation of the driving element, and the preheating unit is raised in height again. Argon is introduced into the sealing unit as a protective gas, the joints of the pressure pipelines are spot-welded at multiple positions by the pre-welding unit, and it is ensured that the welds will not be misaligned in the subsequent circular welding process. The two pressure pipelines are synchronously rotated by cooperating with the driving wheel, and the circular continuous welding is completed.

Description

Technical Field

[0001] This invention relates to the field of welding machine components technology, specifically a high-precision automated wire feeding device for an inverter DC arc welding machine. Background Technology

[0002] Inverter-DC arc welding machines are widely used in metal welding operations, playing a crucial role, especially in automobile manufacturing, ship repair, and construction engineering. Traditional welding machines often employ manual wire feeding, which demands high precision and consistency in the welding process, easily leading to inconsistent weld quality and requiring highly skilled operators. With the development of automation technology, high-precision automated wire feeding devices have gradually become an important component of inverter-DC arc welding machines. These devices can precisely control wire feeding speed and wire feed amount, thereby improving welding quality and efficiency.

[0003] A search revealed that the invention patent with publication number CN111889851B discloses an automatic wire feeding device for an inverter DC arc welding machine. This device overcomes the shortcomings of manual wire feeding in traditional inverter DC arc welding machines by using two parallel automatic wire feeding mechanisms to automatically move the wire feeding gun and the welding gun, thereby achieving uniform speed and high-efficiency welding.

[0004] In the application of existing automated wire feeding devices in the welding process of traditional pressure pipelines, especially in the early stage of arc initiation, due to insufficient preheating of the pipeline end, there is a large temperature difference at the pipe opening, which leads to the concentration of thermal stress in the welding area. The molten pool metal shrinks unevenly under rapid cooling conditions, and cracks are easily generated in the weld and heat-affected zone. When the pipeline is rotated or positioned unstablely, it is also easy to cause weld misalignment or uneven weld bead, which further affects the welding quality of pressure pipelines. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision automated wire feeding device for inverter DC arc welding machines to solve the problems mentioned in the background art.

[0006] The main technical problem solved by this invention is:

[0007] Because the pipe ends are not sufficiently preheated, there is a large temperature difference at the pipe opening, which leads to thermal stress concentration in the welding area. The molten pool metal shrinks unevenly under rapid cooling conditions, and cracks are easily generated in the weld and heat-affected zone. When the pipe is rotated or its positioning is unstable, it is also easy to cause weld misalignment or uneven weld bead.

[0008] This invention can be achieved through the following technical solutions:

[0009] A high-precision automated wire feeding device for an inverter DC arc welding machine includes a base plate. The upper surface of the base plate is provided with a support for accommodating two pressure pipes. A preheating unit for heating the ends of each pressure pipe is raised and lowered above the middle of the support plate.

[0010] The preheating unit includes a fixed ring, and the fixed ring has ring grooves on both sides. A preheating ring sleeve 1 is slidably mounted inside one ring groove, and a preheating ring sleeve 2 is slidably mounted inside the other ring groove. An elastic element is correspondingly mounted inside each ring groove and sleeved on the preheating ring sleeve 1 and the ring groove.

[0011] The bracket has pushers at both ends of its interior, which are driven by segmented stroke cylinders, and a bracket for supporting pressure pipes is raised and lowered at the bottom of the inner cavity of the bracket.

[0012] The inner cavity of the fixed ring is provided with a driving component. During one rotation, the driving component pushes the preheating ring sleeve one and the preheating ring sleeve two away from each other, and the driving component pushes the pressure pipe of the corresponding section.

[0013] During the second rotation, the first and second preheating rings return to their original positions and approach each other under elastic recovery, while the fixed ring rises upwards.

[0014] The inner wall of the bracket is provided with a drive wheel that drives the two pressure pipes to rotate synchronously.

[0015] The outer side of the middle part of the support is provided with a sealing unit for sealing the joint of the pressure pipeline.

[0016] The sealing unit has a pre-welding unit for spot welding of pressure pipelines inside;

[0017] The sealing unit has a wire feeder on the outside and a welding gun connected to the wire feeder inside.

[0018] A further technical improvement of the present invention is that: a reinforcing unit is provided on the upper surface of the support and on both sides of the sealing unit, and the reinforcing unit includes a reinforcing frame, and two simultaneously moving pushing members are rotatably mounted on the surface of each reinforcing frame;

[0019] The two thrust members are centered on the pressure pipe, and the two thrust members are driven by a gear set.

[0020] A further technical improvement of the present invention is that: the preheating unit includes a top plate installed above the reinforcing frame, a limiting plate pushed by a lifting cylinder is installed below the top plate, and a sliding rod that slides on the top plate above the limiting plate.

[0021] The driving component includes a rotating shaft driven by a servo motor. The outer surface of the rotating shaft is provided with an eccentric wheel one and an eccentric wheel two. The edge of the eccentric wheel one always abuts against the side of the preheating ring one, and the edge of the eccentric wheel two always abuts against the side of the preheating ring two.

[0022] A further technical improvement of the present invention is that the pushing member includes a push plate embedded in the inner wall of the support;

[0023] When the segmented stroke cylinder is pushed once, the pressure pipe is pushed by the push plate to the inside of the preheating ring one and the preheating ring two;

[0024] When the segmented stroke cylinder pushes for the second time, the first and second preheating rings reset, approach each other, and rise. The two pressure pipes come together and approach each other under the push of the corresponding push plates.

[0025] A further technical improvement of the present invention is that: a base plate is provided below the substrate, a conveyor frame is provided on the upper surface of the base plate, a hydraulic cylinder for pushing the support frame to rise and fall is provided inside the conveyor frame, and strips are installed on both sides of the conveyor frame;

[0026] Initially, the bracket enters the groove inside the bracket, with a gap between the bracket and the groove, and the length of the pressure pipe is greater than the length of the bracket;

[0027] During descent, both ends of the welded pressure pipe are positioned on the corresponding strips;

[0028] The end of the conveyor is equipped with a baffle.

[0029] A further technical improvement of the present invention is that: the sealing unit includes extensions symmetrically arranged on both sides of the support and connected to the support, and each extension is provided with a fitting part pushed by a synchronous cylinder inside;

[0030] The inner edge of the fitting part is rotatably mounted with a contact part that is in close contact with the edges of the two pressure pipes, and an annular cavity is formed between the two contact parts. One contact part is provided with a filling port for filling with argon gas.

[0031] A further technical improvement of the present invention is that the pre-welding unit includes a set of spot welding heads embedded inside each bonding part, and the set of spot welding heads includes two laser welding heads.

[0032] A further technical improvement of the present invention is that: the wire feeder is provided on another contact part, and a traction unit for pulling the welding wire is provided at the inlet inside the wire feeder, and a clamping unit for clamping the welding wire is provided on one side of the traction unit.

[0033] The traction unit includes a drive unit rotatably mounted inside the inlet. The drive unit includes a hollow gear driven by a drive gear. An intermediate bevel gear is fixedly connected to the end of the hollow gear. The intermediate bevel gear meshes with a reversing bevel gear. A screw is fixed to the end of the reversing bevel gear. A traction pair is threaded onto the screw.

[0034] A further technical improvement of the present invention is that: the clamping unit includes two fixing members, upper and lower, and each fixing member is elastically connected to a clamping frame at its end. The surface of the clamping frame is provided with an inclined surface. The inner wall of the wire feeder away from the inlet is equipped with a moving plate driven by an electric push rod. The surface of the moving plate is equipped with a pushing part that abuts against the inclined surface on the clamping frame.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. Using a fixed-point wire feeding method, the welding wire does not require rotation angle. Circumferential welding is achieved by rotating the pressure pipeline. First, the preheating unit lowers its height, bringing preheating rings one and two to the same height as the center of the pressure pipeline. The drive unit rotates once, moving preheating rings one and two away from each other. A segmented stroke cylinder then pushes the pusher, allowing the end of the pressure pipeline to smoothly enter preheating rings one and two. Preheating rings one and two preheat the ends of each section of the pressure pipeline, reducing thermal stress in the initial welding stage, effectively preventing cracks and porosity, and improving weld density. A second rotation of the drive unit... The preheating rings 1 and 2 detach from the ends of the pressure pipes under the elastic reset of the elastic element. The preheating unit then rises again, and the segmented stroke cylinder drives the pushing element forward for the second time, so that the ends of the pressure pipes fit and center. At this time, the pressure pipes leave the support and reach the bracket. The sealing unit seals the joint of the pressure pipes and introduces argon gas as a protective gas to protect the welding area at the joint. The pre-welding unit performs multiple spot welds on the joint of the pressure pipes to fix the ends of the two pressure pipes and ensure that the weld will not be misaligned during the subsequent circumferential welding process. With the help of the drive wheel, the two pressure pipes rotate synchronously to complete the continuous circumferential welding.

[0037] 2. By setting up reinforcement units, when preheating the ends of each section of pressure pipeline, the two pushers rotate synchronously under the action of the gear set, and at the same time apply pressure to the outer wall of the pressure pipeline, so that the pressure pipeline is supported in the welding area. Since the pushers are arranged concentrically with the pressure pipeline, the applied pressure is evenly distributed on the outer circumference of the pressure pipeline, and no eccentric force is generated or the pipeline is tilted. When disengaging from the first and second preheating rings, the stability of the pressure pipeline is ensured.

[0038] 3. The pressure pipe is supported by the support and bracket. Under the secondary push, the ends of the two pressure pipes are put together, and the other end is located above the groove cavity. When the oil cylinder descends, the pressure pipe descends through the groove cavity, so that both ends of the pressure pipe are on the strip. The baffle prevents the pressure pipe from sliding out and is moved out of the pressure pipe by the strip. Attached Figure Description

[0039] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the preheating unit of the present invention;

[0042] Figure 3 This is a three-dimensional structural diagram of eccentric wheel one and eccentric wheel two of the present invention;

[0043] Figure 4 This is a schematic diagram of the structural connection of the sealing unit of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the pressing unit of the present invention;

[0045] Figure 6 This is a three-dimensional structural diagram of the contact portion and the bonding portion of the present invention;

[0046] Figure 7 This is a schematic diagram of the internal structure of the wire feeder of the present invention.

[0047] In the diagram: 1. Base plate; 2. Support; 3. Base plate; 4. Conveyor frame; 5. Reinforcing frame; 6. Extension; 7. Fitting part; 8. Push plate; 9. Limiting plate; 10. Fixing ring; 11. Preheating ring sleeve one; 12. Preheating ring sleeve two; 13. Rotating shaft; 14. Eccentric wheel one; 15. Eccentric wheel two; 16. Ring groove; 17. Elastic element; 18. Top plate; 19. Hydraulic cylinder; 20. Strip; 21. Support; 22. Drive wheel; 23. Laser welding head; 24. Wire feeder; 25. Contact part; 26. Pushing element; 27. Annular cavity; 28. Pressing frame; 29. ​​Fixing element; 30. Pushing part; 31. Moving plate; 32. Traction wheel pair; 33. Screw; 34. Drive unit. Detailed Implementation

[0048] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0049] Please see Figures 1-7As shown, the present invention provides a high-precision automated wire feeding device for an inverter DC arc welding machine, including a base plate 1. The upper surface of the base plate 1 is provided with a support 2 for accommodating two pressure pipes. A preheating unit for heating the ends of each pressure pipe is raised and lowered above the middle part of the support 2.

[0050] The preheating unit includes a fixed ring 10, and annular grooves 16 are provided on both sides of the inner side of the fixed ring 10. A preheating ring sleeve 11 is provided in the inner side of one annular groove 16 and a preheating ring sleeve 2 12 is provided in the inner side of the other annular groove 16. An elastic element 17 is provided in the inner side of each annular groove 16 and sleeved on the preheating ring sleeve 11 and the annular groove 16.

[0051] The support 2 has pushers at both ends inside, which are driven by segmented stroke cylinders, and a bracket 21 for supporting pressure pipes is raised and lowered at the bottom of the inner cavity of the support 2.

[0052] The inner cavity of the fixed ring 10 is provided with a driving component. When it rotates once, the driving component pushes the preheating ring sleeve 11 and the preheating ring sleeve 2 12 away from each other, and the driving component pushes the pressure pipe of the corresponding section.

[0053] During the second rotation, the preheating ring 11 and the preheating ring 2 12 return to their original positions and move closer together under elastic recovery, and the fixed ring 10 rises upward.

[0054] The inner wall of the bracket 21 is provided with a drive wheel 22 for driving the two pressure pipes to rotate synchronously;

[0055] The outer side of the middle part of the support 2 is provided with a sealing unit for sealing the joint of the pressure pipeline;

[0056] The sealing unit has a pre-welding unit for spot welding of pressure pipelines inside;

[0057] The sealing unit is provided with a wire feeder 24 on the outside and a welding gun connected to the wire feeder 24 is provided inside the sealing unit;

[0058] During use, each section of pressure pipeline is placed inside the support 2 near the pusher, and the pressure pipeline is supported by the support 2 and the bracket 21.

[0059] First, the preheating unit lowers its height so that the preheating ring 11 and the preheating ring 2 12 reach the same height as the center of the pressure pipeline, which facilitates the subsequent pushing action of each section of the pressure pipeline. During this process, the driving component rotates once, squeezing and compressing the corresponding elastic element 17, so that the preheating ring 11 and the preheating ring 2 12 are in a state of being far away from each other.

[0060] Then, the segmented stroke cylinder drives the pusher to move forward, which advances the pressure pipe of the corresponding segment, so that the end of the pressure pipe smoothly enters the preheating ring 11 and the preheating ring 2 12, and the preheating ring 11 and the preheating ring 2 12 preheat the end of each segment of the pressure pipe in advance.

[0061] After preheating, the drive component rotates a second time, and the preheating ring 11 and the preheating ring 2 12 move closer to each other under the elastic reset of the elastic component 17, so that they are separated from the end positions of each section of pressure pipe. The preheating unit rises again, and the segmented stroke cylinder drives the push component forward for the second time, so that the end of the pressure pipe is aligned and centered. At this time, the pressure pipe leaves the support 2 and reaches the bracket 21.

[0062] Next, the sealing unit seals the joint of the pressure pipeline and introduces argon gas into the sealing area as a protective gas to protect the welding area at the joint, reduce oxidation and porosity, improve weld density, and ensure the stability of the weld pool.

[0063] Multiple spot welds are performed on the joints of the pressure pipeline by pre-welding units to fix the two pressure pipeline ports and ensure that the welds will not be misaligned during the subsequent circumferential welding process.

[0064] The wire feeder 24 stably feeds the welding wire to the welding torch. The welding torch docks with the wire feeder 24 in the sealed unit to form an electric arc and melt the welding wire. In conjunction with the drive wheel 22, it drives the two pressure pipes to rotate synchronously to complete the ring continuous welding.

[0065] By heating the ends of each section of the pressure pipeline through the preheating unit, the temperature difference stress in the early stage of welding is reduced, effectively avoiding cracks and porosity, and improving the density of the weld. The entire process from preheating, sealing, pre-welding to automatic wire feeding welding is automated, reducing manual intervention and improving efficiency and consistency.

[0066] See Figure 1 and Figure 5 As shown, the upper surface of the support 2 and the two sides of the sealing unit are respectively provided with reinforcement units. The reinforcement unit includes a reinforcement frame 5, and two simultaneously moving push members 26 are rotatably installed on the surface of each reinforcement frame 5.

[0067] The two pushers 26 are concentric with the pressure pipe, and the two pushers 26 are driven by a gear set;

[0068] In the initial state, the two pushers 26 are in the open state. When the ends of each section of the pressure pipe are preheated, the two pushers 26 rotate synchronously under the action of the gear set, and at the same time apply pressure to the outer wall of the pressure pipe, so that the pressure pipe is supported in the welding area. Since the pushers 26 are arranged concentrically with the pressure pipe, the applied pressure is evenly distributed on the outer circumference of the pressure pipe, and no eccentric force is generated or the pipe is tilted. When the pressure pipe is separated from the preheating ring 11 and the preheating ring 2 12, the stability of the pressure pipe is ensured.

[0069] See Figure 2 and Figure 3 As shown, the preheating unit includes a top plate 18 installed above the reinforcing frame 5, a limiting plate 9 pushed by a lifting cylinder is installed below the top plate 18, and a sliding rod that slides on the top plate 18 is provided above the limiting plate 9.

[0070] The driving component includes a rotating shaft 13 driven by a servo motor. The outer surface of the rotating shaft 13 is provided with an eccentric wheel 14 and an eccentric wheel 15. The edge of the eccentric wheel 14 always abuts against the side of the preheating ring 11, and the edge of the eccentric wheel 15 always abuts against the side of the preheating ring 12.

[0071] The lifting cylinder drives the limit plate 9 to descend, thereby adjusting the overall height of the preheating unit and ensuring that the preheating ring 11 and the preheating ring 2 12 are precisely aligned with the center height of the pressure pipeline. When the servo motor drives the rotating shaft 13 to rotate, the eccentric wheel 14 and the eccentric wheel 2 15 undergo eccentric motion, which pushes the preheating ring 11 and the preheating ring 2 12 to move synchronously. During one rotation of the rotating shaft 13, the preheating ring 11 and the preheating ring 2 12 are forced to separate along the outer edge of the eccentric wheel.

[0072] During the secondary rotation of the rotating shaft 13, the preheating ring 11 and the preheating ring 12 approach each other again under the restoring force of the elastic element 17 and the drive of the two eccentric wheels, disengage from the port of the pressure pipe, and return to the initial state.

[0073] See Figure 1 and Figure 2 As shown, the pushing component includes a push plate 8 embedded in the inner wall of the support 2;

[0074] When the segmented stroke cylinder is pushed once, the push plate 8 pushes the pressure pipe to the inside of the preheating ring 11 and the preheating ring 2 12;

[0075] When the segmented stroke cylinder is pushed for the second time, the preheating ring 11 and the preheating ring 2 12 reset, approach each other, and rise. The two pressure pipes are pushed together and approach each other by the corresponding push plate 8.

[0076] See Figure 1 and Figure 4As shown, a base plate 3 is provided below the substrate 1, and a conveyor frame 4 is provided on the upper surface of the base plate 3. The conveyor frame 4 is provided with a hydraulic cylinder 19 that pushes the support 21 to rise and fall, and strips 20 are installed on both sides of the conveyor frame 4.

[0077] Initially, the bracket 21 enters the groove inside the bracket 2, and there is a gap between the bracket 21 and the groove. The length of the pressure pipe is greater than the length of the bracket 21.

[0078] During descent, both ends of the welded pressure pipe are positioned on the corresponding strip 20;

[0079] The end of the conveyor frame 4 is equipped with a baffle;

[0080] Before welding, bracket 21 is in the raised state and extends into the groove of bracket 2 to provide support for the pressure pipeline that has not yet been welded;

[0081] During welding, the bracket 21 cooperates with the drive wheel 22 to drive the two pressure pipes to rotate, ensuring the uniformity of the circumferential weld. Then, the hydraulic cylinder 19 drives the bracket 21 to descend, so that the end of the pressure pipe gradually leaves the clamping range of the support 2 and is finally supported by the strips 20 on both sides. The welded pressure pipe stays on the strip 20, and the baffle prevents the pressure pipe from sliding out. It is then transferred out by the strip 20.

[0082] See Figure 1 , Figure 4 and Figure 6 As shown, the sealing unit includes extensions 6 symmetrically arranged on both sides of the support 2 and connected to the support 2. Each extension 6 has an internal fitting part 7 pushed by a synchronous cylinder.

[0083] The inner edge of the fitting part 7 is rotatably mounted with a contact part 25 that is in close contact with the edges of the two pressure pipes. An annular cavity 27 is formed between the two contact parts 25. One contact part 25 is provided with an argon gas filling inlet.

[0084] Initially, the two mating parts 7 are in a state of being far apart from each other, which facilitates the descent of the preheating unit and realizes the preheating of the pressure pipe end;

[0085] After preheating and alignment, the synchronous cylinder drives the two contact parts 7 to move simultaneously toward the pressure pipe port until the contact part 25 is tightly attached to the surface of the pressure pipe, thereby forming a closed annular cavity 27 around the joint position of the two pressure pipe sections. Argon gas is introduced into the annular cavity 27 through the filling inlet to form a stable protective atmosphere during the welding process, effectively isolating air, reducing oxidation and porosity, and ensuring the stability of the weld pool.

[0086] See Figure 4As shown, the pre-welding unit includes a set of spot welding heads embedded inside each bonding part 7. The set of spot welding heads includes two laser welding heads 23, which perform multi-point laser welding on the joint of the pressure pipe to prevent misalignment when the two pressure pipe sections rotate synchronously.

[0087] See Figure 4 and Figure 7 As shown, the wire feeder 24 is provided on another contact part 25, and the inlet inside the wire feeder 24 is provided with a traction unit for pulling the welding wire, and a clamping unit for clamping the welding wire is provided on one side of the traction unit.

[0088] The traction unit includes a drive unit 34 rotatably installed in the inlet. The drive unit 34 includes a hollow gear driven by a drive gear. An intermediate bevel gear is fixedly connected to the end of the hollow gear. The intermediate bevel gear meshes with a reversing bevel gear. A screw 33 is fixed to the end of the reversing bevel gear. A traction pair 32 is threaded onto the screw 33.

[0089] The clamping unit includes two fixing members 29, one above the other. Each fixing member 29 is elastically connected to a clamping frame 28 at its end. The surface of the clamping frame 28 is provided with an inclined surface. The inner wall of the wire feeder 24, away from the inlet, is equipped with a moving plate 31 driven by an electric push rod. The surface of the moving plate 31 is equipped with a pushing part 30 that pushes against the inclined surface on the clamping frame 28.

[0090] The drive gear drives the hollow gear to rotate. The hollow gear changes direction through the intermediate bevel gear and the reversing bevel gear, thereby driving the screw 33 to rotate. The rotation of the screw 33 causes the traction wheel 32 to move along the thread. The traction wheel 32 pushes the welding wire to be smoothly fed in the inlet direction, completing the traction of the welding wire. Precise linear motion is achieved through the screw 33 and the traction wheel 32, and the welding wire feed speed is controllable.

[0091] Then, the electric push rod pushes the moving plate 31 forward, and the pushing part 30 on the moving plate 31 pushes against the inclined surface of the clamping frame 28, so that the clamping frame 28 applies clamping force to the welding wire. Under the clamping action, the friction between the welding wire and the traction wheel 32 increases, which prevents the welding wire from slipping during the feeding process. The traction and clamping units work together to ensure that the welding wire is still fed stably under high-speed welding and pipeline rotation, and to prevent arc breakage or blank welding during the welding process.

[0092] In use, this invention employs a fixed-point welding wire feeding method, eliminating the need for wire rotation. The pressure pipe rotates to achieve circumferential welding. First, the preheating unit lowers its height, bringing preheating rings 11 and 12 to the same height as the center of the pressure pipe. The driving component rotates once, causing preheating rings 11 and 12 to move away from each other. A segmented stroke cylinder then pushes the pushing component, allowing the end of the pressure pipe to smoothly enter preheating rings 11 and 12. Preheating rings 11 and 12 preheat the ends of each section of the pressure pipe, reducing initial temperature stress during welding, effectively preventing cracks and porosity, and improving weld density. The drive unit rotates a second time, and the preheating ring 11 and preheating ring 2 12 are released from the ends of each pressure pipe section under the elastic reset of the elastic element 17. The preheating unit rises again, and the segmented stroke cylinder drives the pusher forward for the second time, so that the ends of the pressure pipe are aligned and centered. At this time, the pressure pipe leaves the support 2 and reaches the bracket 21. The sealing unit seals the joint of the pressure pipe and introduces argon gas as a protective gas to protect the welding area at the joint. The pre-welding unit performs multiple spot welds on the joint of the pressure pipe to fix the ends of the two pressure pipe sections and ensure that the weld will not be misaligned in the subsequent circumferential welding process. The drive wheel 22 drives the two pressure pipe sections to rotate synchronously to complete the continuous circumferential welding.

[0093] By setting up reinforcement units, when the ends of each section of pressure pipeline are preheated, the two pushers 26 rotate synchronously under the action of the gear set, and at the same time apply pressure to the outer wall of the pressure pipeline, so that the pressure pipeline is supported in the welding area. Since the pushers 26 are arranged concentrically with the pressure pipeline, the applied pressure is evenly distributed on the outer circumference of the pressure pipeline, and no eccentric force is generated or the pipeline is tilted. When the pressure pipeline is separated from the preheating ring 11 and the preheating ring 2 12, the stability of the pressure pipeline is guaranteed.

[0094] The pressure pipe is supported by the support 2 and the bracket 21. Under the secondary push, the ends of the two pressure pipes are attached together, and the other end is located above the groove cavity. When the oil cylinder 19 descends, the pressure pipe descends through the groove cavity, so that both ends of the pressure pipe are located on the strip 20, and the baffle prevents the pressure pipe from sliding out. The pressure pipe is transferred out by the strip 20.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-precision automatic wire-feeding device for an inverter DC arc welder, comprising a base plate (1), characterized in that: The upper surface of the substrate (1) is provided with a seat (2) for accommodating two sections of pressure pipeline, and a preheating unit is arranged above the middle part of the seat (2) for heating the end of each section of pressure pipeline; The preheating unit comprises a fixed ring (10), and the inner sides of the fixed ring (10) are respectively provided with ring grooves (16), the inner side of one ring groove (16) is provided with a preheating ring sleeve one (11) in limiting sliding mode, the inner side of the other ring groove (16) is provided with a preheating ring sleeve two (12) in limiting sliding mode, and the inner side of each ring groove (16) is correspondingly provided with an elastic member (17) sleeved on the preheating ring sleeve one (11) and the ring groove (16); The inner sides of the seat (2) are respectively provided with pushers driven by sectional stroke air cylinders, and the inner cavity bottom of the seat (2) is provided with a bracket (21) for supporting the pressure pipeline in lifting mode; The inner cavity middle part of the fixed ring (10) is rotatably provided with a driving member, when the driving member is rotated once, the preheating ring sleeve one (11) and the preheating ring sleeve two (12) are pushed away from each other, and the corresponding section of pressure pipeline is pushed by the pusher; When the driving member is rotated twice, the preheating ring sleeve one (11) and the preheating ring sleeve two (12) are reset to be close to each other under the elastic recovery, and the fixed ring (10) is lifted upward; The inner wall surface of the bracket (21) is provided with a driving wheel (22) for driving two sections of pressure pipeline to rotate synchronously; The middle part of the seat (2) is provided with a sealing unit for sealing the joint of the pressure pipeline on the outer side; The inner side of the sealing unit is provided with a pre-welding unit for spot welding the pressure pipeline; The outer side of the sealing unit is provided with a wire feeding seat (24), and the inner side of the sealing unit is provided with a welding gun connected with the wire feeding seat (24).

2. The high-precision automatic wire feeding device for the inverter DC arc welder according to claim 1, characterized in that, The upper surface of the seat (2) and located on both sides of the sealing unit are respectively provided with reinforcing units, and the reinforcing unit comprises a reinforcing frame (5), and two simultaneously moving abutting pushers (26) are rotatably installed on the surface of each reinforcing frame (5); The two abutting pushers (26) have the same center as the pressure pipeline, and the two abutting pushers (26) are driven by a gear set.

3. The high-precision automatic wire feeding device for the inverter DC arc welder according to claim 1, characterized in that, The preheating unit comprises a top plate (18) installed above the reinforcing frame (5), a limiting plate (9) driven by a lifting cylinder is installed below the top plate (18), and the limiting plate (9) is provided with a sliding rod limiting sliding on the top plate (18) on the upper side; The driving member comprises a rotating shaft (13) driven by a servo motor, the outer surface of the rotating shaft (13) is respectively provided with an eccentric wheel one (14) and an eccentric wheel two (15), the edge of the eccentric wheel one (14) is always in abutment with the side surface of the preheating ring sleeve one (11), and the edge of the eccentric wheel two (15) is always in abutment with the side surface of the preheating ring sleeve two (12).

4. The high-precision automatic wire feeding device for the inverter DC arc welder according to claim 1, characterized in that, The pusher comprises a push plate (8) embedded in the inner wall of the seat (2); When the sectional stroke air cylinder is pushed once, the push plate (8) pushes the pressure pipeline into the inner sides of the preheating ring sleeve one (11) and the preheating ring sleeve two (12); When the sectional stroke air cylinder is pushed twice, the preheating ring sleeve one (11) and the preheating ring sleeve two (12) are reset to be close to each other and lifted, and two sections of pressure pipeline are close to each other under the pushing of the corresponding push plate (8).

5. The high-precision automatic wire feeding device for the inverter DC arc welder according to claim 1, characterized in that, The bottom plate (3) is arranged below the substrate (1), the upper surface of the bottom plate (3) is provided with a conveying frame (4), the conveying frame (4) is internally provided with an oil cylinder (19) for lifting a pushing bracket (21), and the two side edges of the conveying frame (4) are each provided with a strip (20); Initially, the bracket (21) enters the groove cavity inside the holder (2), the bracket (21) has a gap with the groove cavity, and the length of the pressure pipeline is greater than the length of the bracket (21); When descending, the two ends of the welded pressure pipeline are located on the corresponding strips (20); The end of the conveying frame (4) is provided with a baffle.

6. The high-precision automatic wire feeder for inverter DC arc welder according to claim 1, characterized in that, The sealing unit comprises an extension part (6) symmetrically arranged on both sides of the holder (2) and connected with the holder (2), and the inner part of each extension part (6) is respectively provided with a fitting part (7) pushed by a synchronous cylinder; The inner edge of the fitting part (7) is rotatably provided with a contact part (25) in close contact with the edges of the two pressure pipelines, and an annular cavity (27) is formed between the two contact parts (25), and one of the contact parts (25) is provided with a filling inlet for filling argon.

7. The high-precision automatic wire feeder for inverter DC arc welder according to claim 1, characterized in that, The pre-welding unit comprises a group of spot welding heads embedded in the inner part of each fitting part (7), and the group of spot welding heads comprises two laser welding heads (23).

8. The high-precision automatic wire feeding device for the inverter DC arc welder according to claim 6, characterized in that, The wire feeding seat (24) is arranged on the other contact part (25), and a traction unit for pulling the welding wire is arranged at the inlet of the wire feeding seat (24), and a pressing unit for clamping the welding wire is arranged on one side of the traction unit; The traction unit comprises a driving part (34) rotatably arranged in the inlet, the driving part (34) comprises a hollow gear driven by a driving gear, the end of the hollow gear is fixedly connected with an intermediate bevel gear, the intermediate bevel gear is engaged with a reversing bevel gear, the end of the reversing bevel gear is fixedly provided with a screw rod (33), and the screw rod (33) is threadedly sleeved with a traction pair of wheels (32).

9. The high-precision automatic wire feeder for inverter DC arc welder according to claim 8, characterized in that, The pressing unit comprises two upper and lower fixed parts (29), the end of each fixed part (29) is elastically connected with a pressing bracket (28), the surface of the pressing bracket (28) is provided with an inclined surface, the inner wall of the wire feeding seat (24) away from the inlet is provided with a moving plate (31) pushed by an electric push rod, and the surface of the moving plate (31) is provided with a pushing part (30) in abutting cooperation with the inclined surface of the pressing bracket (28).

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