A multi-wire submerged arc welding device for pipe

Abstract

The utility model relates to a welded pipe welding technical field especially relates to a kind of welded pipe multiwire submerged-arc welding device, specifically includes base, support mechanism and mobile welding mechanism;The support mechanism includes two supporting rollers of being set side by side along the length direction of base;The mobile welding mechanism includes the linear track of being fixedly arranged in the one side of base and being parallel with supporting roller, linear track is matched with the movable slider of being arranged in, movable slider is fixedly provided with support frame on, and the top of support frame is provided with welding arm along the width direction of base, and the inner end of welding arm is vertically set with welding torch;The utility model is by being provided with the material cylinder structure that can rotate around the axis of welding torch, utilizes servo motor drive movable gear and fixed gear meshing drive, drives cross arm and material cylinder synchronous rotation, makes the direction of flux supply always consistent with the direction of travel of welding torch, solves the poor working condition adaptability problem caused by welding cylinder and welding torch relative fixation of traditional device, effectively reduces production cost, improves production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of welded pipe welding technology especially relates to a welded pipe multiwire submerged arc welding device. BACKGROUND

[0002] Welded pipe is a kind of slit steel pipe welded after being curled into shape by steel plate / steel strip, and has become the core structural component in the fields of construction, machinery manufacturing, fluid delivery and the like due to its high structural strength and excellent production efficiency. To improve the welding efficiency and quality, multiwire submerged arc welding process is widely used, which significantly improves the welding speed while ensuring the forming quality of weld by synchronously applying two or more welding wires. The specific process is as follows: the welding cylinder pre-lays a flux layer to the joint of workpiece, and then the welding torch sends the welding wire into the flux layer to ignite the arc, and the molten welding wire, base material and flux form a molten pool together, and finally solidify into a dense weld.

[0003] There are two typical welding conditions in the current welded pipe production: one is the longitudinal straight seam welding of semi-finished welded pipe after plate forming (straight line condition), and the other is the circumferential butt welding between finished welded pipes (annular condition). These two conditions have completely different requirements for the trajectory adaptability of the welding device: the welding torch needs to travel linearly along the axial direction of the pipe body in the straight line condition, while the welding torch needs to be fixed and the pipe body needs to rotate circumferentially in the annular condition.

[0004] Since the submerged arc welding requires the welding cylinder to be always located in front of the welding torch in the direction of travel, and the welding cylinder and the welding torch of the existing device are relatively fixed, the device cannot be flexibly switched between the straight line condition and the annular condition, and thus separate equipment needs to be arranged for each condition, which not only increases the production cost, but also reduces the production efficiency. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a welded pipe multiwire submerged arc welding device that can consider both conditions, reduce production cost and improve production efficiency.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A welded pipe multiwire submerged arc welding device, characterized in that:

[0008] It comprises a base, a supporting mechanism and a moving welding mechanism.

[0009] The supporting mechanism comprises two supporting rollers arranged side by side along the length direction of the base.

[0010] The mobile welding mechanism comprises a linear track fixedly arranged on one side of the base and parallel to the supporting roller, a mobile sliding block matched and arranged in the linear track, a supporting frame fixedly arranged on the mobile sliding block, a welding arm arranged on the top of the supporting frame along the width direction of the base, a welding gun vertically downward arranged on the inner end of the welding arm, a welding wire arranged in the welding gun, and an opening arranged on the bottom of the welding gun for the welding wire to extend out.

[0011] A barrel is arranged on one side of the welding gun in parallel, a clamp is coaxially arranged on the outer circumferential side of the barrel, and a swivel joint is coaxially arranged on the outer circumferential side of the welding gun.

[0012] A fixed gear is coaxially and fixedly arranged on the outer circumferential side of the welding gun above the swivel joint, a mobile gear meshing with the fixed gear is rotatably arranged on the upper surface of the cross arm, a servo motor is arranged below the cross arm, and the power output end of the servo motor penetrates through the cross arm upwards and is fixedly connected with the mobile gear to drive the cross arm to rotate the barrel around the welding gun.

[0013] The technical problems to be solved by the utility model can be further realized by the following steps, an inner supporting mechanism for positioning the welded pipe is arranged on one end of the base in the length direction; the inner supporting mechanism comprises a vertical support, a reduction gearbox is fixedly installed on the upper end of the support, a positioning disc is rotatably arranged on the side of the reduction gearbox facing the base, an inner rotating drum is fixedly connected on the side of the positioning disc facing the base, an outer rotating drum is slidably sleeved on the outer part of the inner rotating drum, and a plurality of supporting rods are arranged in parallel and equidistantly on the outer circumferential side of the outer rotating drum.

[0014] The technical problems to be solved by the utility model can be further realized by the following steps; a small sliding groove corresponding to the position of the supporting rod is radially arranged on the positioning disc, and the adjacent end of each supporting rod is installed in the corresponding small sliding groove through a small sliding block; a connecting wing corresponding to the position of the supporting rod is arranged on the outer circumferential surface of the outer rotating drum, two swing rods are hingedly arranged at the two ends of each connecting wing, and the two swing rods on the same connecting wing are parallel to each other and are hingedly connected with the corresponding supporting rod.

[0015] The technical problems to be solved by the utility model can be further realized by the following steps: a threaded groove is arranged on the end of the inner rotating drum away from the positioning disc, a threaded rod is matched and arranged in the threaded groove, an inner supporting motor is fixedly arranged on the end of the outer rotating drum away from the positioning disc, the power output end of the inner supporting motor penetrates through the end surface of the outer rotating drum and is fixedly connected with the threaded rod; a slewing motor is installed on the side of the reduction gearbox away from the base, and the power output end of the slewing motor is fixedly connected with the positioning disc through the reduction gearbox to drive the positioning disc to rotate the supporting rod around the positioning disc axis.

[0016] The technical problems to be solved by the utility model can be further realized through the following steps, two ends of the upper surface of the base are respectively provided with lifting grooves, the supporting mechanism further comprises lifting tables corresponding to being installed inside the lifting grooves, two bearing seats are symmetrically installed on the upper surface of each lifting table, both ends of the supporting roller are rotationally connected with the same side bearing seat on different lifting tables; a driving cylinder for pushing the lifting table to vertically lift and further adjusting the height of the supporting roller is installed at the groove bottom of the lifting groove.

[0017] The technical problems to be solved by the utility model can be further realized through the following steps, the top of the supporting frame is fixedly provided with an adjusting frame, a screw rod lifting mechanism connected with power is arranged inside the adjusting frame, the outer end of the welding arm extends into the inside of the adjusting frame and is fixedly connected with the power output end of the screw rod lifting mechanism.

[0018] The technical problems to be solved by the utility model can be further realized through the following steps, a screw rod moving mechanism connected with power is arranged inside the linear rail, the moving slider is fixedly connected with the power output end of the screw rod moving mechanism.

[0019] The technical problems to be solved by the utility model can be further realized through the following steps, the top of the material cylinder is provided with a material bin, a material pump is installed between the outlet of the material bin and the material cylinder, the bottom of the material cylinder is provided with a discharge port communicated with the outlet of the material pump.

[0020] Compared with the prior art, the utility model has the advantages that: through setting the material cylinder structure that can rotate around the welding gun axis, the servo motor drives the moving gear and the fixed gear to mesh transmission, drives the cross arm and the material cylinder to rotate synchronously, makes the flux supply direction always keep consistent with the welding gun advancing direction, solves the poor working condition adaptability problem caused by the relative fixation of the welding cylinder and the welding gun in the traditional device, effectively reduces the production cost, improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the overall top view schematic diagram of the utility model;

[0022] Figure 2 It is the left view schematic diagram (the material cylinder is relatively Figure 1 Rotated 90° to the right) of the utility model;

[0023] Figure 3 It is the structure schematic diagram a (retracted) of the inner supporting mechanism of the utility model;

[0024] Figure 4 It is the structure schematic diagram b (expanded) of the inner supporting mechanism of the utility model;

[0025] Figures 1-2 The dot-dash line frame in the figure is the local enlarged part;

[0026] In the figure: base 1, carrier roller 2, straight rail 3, moving slider 4, support frame 5, welding arm 6, welding gun 7, welding wire 8, barrel 9, clamp 10, swivel ring 11, cross arm 12, fixed gear 13, moving gear 14, servo motor 15, support 16, reduction box 17, positioning disc 18, inner rotating drum 19, outer rotating drum 20, support rod 21, small slide 22, small slide 23, connecting wing 24, swing rod 25, threaded groove 26, threaded rod 27, inner support motor 28, rotary motor 29, lifting platform 30, bearing seat 31, driving cylinder 32, height adjusting frame 33, screw rod lifting mechanism 34, screw rod moving mechanism 35, material bin 36, material pump 37. DETAILED DESCRIPTION

[0027] The specific technical solutions of the utility model are further described below so as to enable those skilled in the art to further understand the utility model without constituting a limitation on its rights.

[0028] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0029] Please refer to Figures 1-4 A welded pipe multi-wire submerged arc welding device, comprising a base 1, a supporting mechanism and a moving welding mechanism; the supporting mechanism comprises two carrier rollers 2 arranged side by side along the length direction of the base 1, and a supporting station for placing a welded pipe is formed between the two carrier rollers 2; the moving welding mechanism comprises a straight rail 3 fixedly arranged on one side of the base 1 and parallel to the carrier roller 2, a moving slider 4 is movably arranged in the straight rail 3, a support frame 5 is fixedly arranged on the moving slider 4, a welding arm 6 is arranged on the top of the support frame 5 along the width direction of the base 1, a welding gun 7 is fixedly connected to the inner end of the welding arm 6 and vertically downward, a welding wire 8 and a corresponding unwinding mechanism are arranged in the welding gun 7, and an opening is arranged at the bottom of the welding gun 7 for the welding wire 8 to extend out, and the opening is provided with at least two openings;

[0030] A barrel 9 is arranged parallel to one side of the welding gun 7, a clamp 10 is coaxially arranged on the outer circumferential side of the barrel 9, a swivel ring 11 is coaxially and rotatably arranged on the outer circumferential side of the welding gun 7, and the swivel ring 11 and the clamp 10 are fixedly connected as a whole through a horizontally arranged cross arm 12; after the clamp 10 is tightened, it is relatively fixed with the barrel 9; after the clamp 10 is loosened, it is fixed, and at this time, the height of the barrel 9 can be manually adjusted.

[0031] A fixed gear 13 is coaxially and fixedly installed on the outer periphery of the welding torch 7 above the rotating ring 11. A movable gear 14 that meshes with the fixed gear 13 is rotatably installed on the upper surface of the horizontal arm 12. A servo motor 15 is installed below the horizontal arm 12. The power output end of the servo motor 15 passes upward through the horizontal arm 12 and is fixedly connected to the movable gear 14 to drive the horizontal arm 12 to drive the material cylinder 9 to rotate around the welding torch 7.

[0032] With this setup, when welding pipes in a straight line, the servo motor 15 is used to adjust the barrel 9 to the exact left side of the welding torch 7 (i.e., Figure 1 (as shown in the image), and loosen the clamp 10 to adjust the material cylinder 9 to a suitable height before tightening it again. At this time, the moving slider 4 can be propelled to slide from right to left along the straight track 3 to weld the straight weld seam;

[0033] When welding pipes in a circular working condition, the servo motor 15 is used to adjust the barrel 9 to the rear side of the welding torch 7 (i.e., Figure 2 (as shown in the image), loosen clamp 10, adjust cylinder 9 to a suitable height, and then tighten it. At this point, the welding pipe can be rotated to perform welding on the circumferential weld.

[0034] To facilitate the rotation of the welded pipe and enhance the positioning function for welded pipes with different inner diameters, an inner support mechanism for positioning the welded pipe is provided at one end of the base 1 along its length. The inner support mechanism includes a vertically arranged support 16, which is fixed to one side of the base 1. A reduction gearbox 17 is fixedly installed on the upper end of the support 16. A positioning disc 18 is rotatably arranged on the side of the reduction gearbox 17 facing the base 1. An inner rotating cylinder 19 is fixedly connected to the side of the positioning disc 18 facing the base 1. An outer rotating cylinder 20 is slidably sleeved on the outside of the inner rotating cylinder 19. Several support rods 21 are arranged parallel and equidistantly on the outer periphery of the outer rotating cylinder 20.

[0035] In the above structure, the positioning disk 18 has small slides 22 radially corresponding to the positions of the support rods 21. The adjacent ends of each support rod 21 are installed in the corresponding small slides 22 via small sliders 23. The outer circumferential surface of the outer rotating cylinder 20 is integrally connected with connecting wings 24 corresponding to the positions of the support rods 21. Each end of each connecting wing 24 is hinged with a swing rod 25. The two swing rods 25 on the same connecting wing 24 are parallel to each other and are respectively hinged to the corresponding support rods 21. Thus, each connecting wing 24, the corresponding support rod 21, and the two swing rods 25 thereon form a parallelogram mechanism. Since the ends of the support rods 21 are installed in the small slides 22, adjusting the axial position of the connecting wing 24 can drive the support rods 21 closer to or further away from the outer rotating cylinder 20.

[0036] To achieve axial position adjustment of the connecting wing 24, a threaded groove 26 is provided at the end of the inner rotating cylinder 19 away from the positioning disk 18. A threaded rod 27 is fitted inside the threaded groove 26. An inner support motor 28 is fixedly installed at the end of the outer rotating cylinder 20 away from the positioning disk 18. The power output end of the inner support motor 28 passes through the end face of the outer rotating cylinder 20 and is fixedly connected to the threaded rod 27. Thus, the inner support motor 28 drives the threaded rod 27 to rotate, thereby pushing the outer rotating cylinder 20 and the connecting wing 24 closer to or away from the positioning disk 18, thereby driving the support rod 21 closer to or away from the outer rotating cylinder 20.

[0037] To enable the welded pipe to rotate under annular conditions, a rotary motor 29 is fixedly installed on the side of the reduction gearbox 17 away from the base 1. The power output end of the rotary motor 29 is fixedly connected to the positioning disk 18 through the reduction gearbox 17, so as to drive the positioning disk 18 to drive the support rod 21 to rotate around the axis of the positioning disk 18. Furthermore, the outer surface of the support rod 21 is set as an arc surface that is easier to fit the inner circumference of the welded pipe.

[0038] To assist in positioning the internal support mechanism and ensure more even force distribution on the welded pipe, the two ends of the upper surface of the base 1 (i.e. Figure 1 The support mechanism includes lifting slots at both ends (left and right). Each lifting platform 30 is installed inside one of the lifting slots. Two bearing seats 31 are symmetrically mounted on the upper surface of each lifting platform 30. The two ends of the roller 2 are rotatably connected to the bearing seats 31 on the same side of each lifting platform 30. A drive cylinder 32 is installed at the bottom of the lifting slot to vertically raise and lower the lifting platform 30, thereby adjusting the height of the roller 2. Thus, the height of the roller 2 can be adjusted by the drive cylinder 32, ensuring it always supports the bottom of the target welded pipe.

[0039] To enhance the flexibility of the device and further adapt to welded pipes of different inner diameters, a height adjustment frame 33 is fixedly installed on the top of the support frame 5. Inside the height adjustment frame 33 is a screw lifting mechanism 34 connected to a power source. The outer end of the welding arm 6 extends into the height adjustment frame 33 and is fixedly connected to the power output end of the screw lifting mechanism 34. The screw lifting mechanism 34 is a vertically arranged screw and nut mechanism driven by a motor, and the outer end of the welding arm 6 is integrally connected to the nut in the aforementioned screw and nut mechanism.

[0040] To propel the movable slide block along the linear slide rail, a lead screw moving mechanism 35 connected to a power source is installed inside the linear track 3. The movable slider 4 is fixedly connected to the power output end of the lead screw moving mechanism 35. The lead screw moving mechanism 35 is a horizontally arranged lead screw and nut mechanism driven by a motor, and the movable slider 4 is integrally connected to the nut in the aforementioned lead screw and nut mechanism.

[0041] Specifically, a hopper 36 is provided at the top of the material cylinder 9, and a material pump 37 is installed between the outlet of the hopper and the material cylinder 9. A discharge port communicating with the outlet of the material pump is provided at the bottom of the material cylinder 9. Thus, the discharge speed of the flux can be adjusted by controlling the flow rate of the material pump, thereby laying out granular layers of different thicknesses.

[0042] Working Principle: In use, the pipe to be welded is first hoisted onto the support position formed by two rollers 2, ensuring that the support rods 21 are entirely inside the pipe. Then, the inner support motor 28 is started to drive the threaded rod 27 to rotate, pushing the outer rotating drum 20 to move axially to the right. The swing rod 25 drives the support rods 21 to expand radially until an interference fit is formed with the inner wall of the pipe. At this time, the rotary motor 29 can drive the pipe to rotate through the reduction gearbox 17.

[0043] Welding operations are divided into two modes:

[0044] (1) Linear welding mode (linear working condition):

[0045] The servo motor 15 drives the moving gear 14 to mesh with the fixed gear 13 to rotate, causing the horizontal arm 12 to rotate the material cylinder 9 to the left side of the welding gun 7. Figure 1 (as shown in the image) Then, the welding torch 7 is lowered to a distance of 20-30mm from the weld seam by the screw lifting mechanism 34, and the material cylinder 9 outlet is adjusted to be flush with the lower end of the welding wire 8 by the tightening clamp 10. Then, the screw moving mechanism 35 pushes the moving slider 4 to move at a constant speed from right to left along the straight track 3. At the same time, the material pump quantitatively delivers flux to the welding point to form a covering layer, and the welding torch 7 delivers the welding wire 8 to ignite the arc to complete the welding.

[0046] (2) Circular welding mode (circular working condition):

[0047] The servo motor 15 drives the moving gear 14 to mesh with the fixed gear 13 to rotate, causing the horizontal arm 12 to rotate the material cylinder 9 to the rear side of the welding gun 7. Figure 2 (as shown in the image) Then, the height of the welding torch 7 is adjusted by the screw lifting mechanism 34, and the height of the material cylinder 9 is adjusted by the tightening clamp 10, so that the distance between the two and the weld is 20-30mm. Then, the rotary motor 29 drives the welding pipe to rotate through the reduction gearbox 17. At the same time, the material pump quantitatively delivers the flux to the welding point to form a covering layer. The welding torch 7 then delivers the welding wire 8 to ignite the arc under the flux layer to achieve welding.

[0048] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A multi-wire submerged arc welding device for welded pipes, characterized in that: Includes a base, a support mechanism, and a movable welding mechanism; The supporting mechanism includes two rollers arranged side by side along the length of the base; The mobile welding mechanism includes a linear track fixedly installed on one side of the base and parallel to the roller. A movable slider is installed inside the linear track. A support frame is fixedly installed on the movable slider. A welding arm is installed on the top of the support frame along the width direction of the base. A welding gun is installed vertically downward at the inner end of the welding arm. A welding wire is installed inside the welding gun. An opening for the welding wire to extend is provided at the bottom of the welding gun. A material cylinder is arranged parallel to one side of the welding torch, and a clamp is coaxially arranged on the outer periphery of the material cylinder. A rotating ring is coaxially arranged on the outer periphery of the welding torch, and the rotating ring and the clamp are fixedly connected as one unit by a horizontally arranged cross arm. A fixed gear is coaxially and fixedly installed on the outer periphery of the welding torch above the rotating ring. A movable gear that meshes with the fixed gear is rotatably installed on the upper surface of the cross arm. A servo motor is installed below the cross arm. The power output end of the servo motor passes upward through the cross arm and is fixedly connected to the movable gear to drive the cross arm to drive the barrel to rotate around the welding torch.

2. The multi-wire submerged arc welding device for welded pipes according to claim 1, characterized in that: An internal support mechanism for positioning the welded pipe is provided at one end of the base along its length. The internal support mechanism includes a vertically arranged support, a gearbox is fixedly installed at the upper end of the support, a positioning plate is rotatably arranged on the side of the gearbox facing the base, an inner rotating cylinder is fixedly connected to the side of the positioning plate facing the base, an outer rotating cylinder is slidably sleeved on the outside of the inner rotating cylinder, and several support rods are arranged parallel and equidistantly on the outer periphery of the outer rotating cylinder.

3. The multi-wire submerged arc welding device for welded pipes according to claim 2, characterized in that: The positioning plate has small slides along the radial direction corresponding to the positions of the support rods. The end of each support rod adjacent to the support rod is installed in the corresponding small slide through a small slider. The outer circumferential surface of the outer rotating cylinder is provided with connecting wings corresponding to the positions of the support rods. Each connecting wing has a swing rod hinged to both ends. The two swing rods on the same connecting wing are parallel to each other and are respectively hinged to the corresponding support rods.

4. The multi-wire submerged arc welding device for welded pipes according to claim 3, characterized in that: The inner rotating cylinder has a threaded groove at the end away from the positioning plate, and a threaded rod is fitted inside the threaded groove. An inner support motor is fixedly installed at the end of the outer rotating cylinder away from the positioning plate. The power output end of the inner support motor passes through the end face of the outer rotating cylinder and is fixedly connected to the threaded rod. A rotary motor is installed on the side of the gearbox away from the base. The power output end of the rotary motor is fixedly connected to the positioning plate through the gearbox to drive the positioning plate to drive the support rod to rotate around the axis of the positioning plate.

5. The multi-wire submerged arc welding device for welded pipes according to claim 4, characterized in that: The upper surface of the base has lifting grooves at both ends. The supporting mechanism also includes lifting platforms installed inside the lifting grooves. Each lifting platform has two bearing seats symmetrically installed on its upper surface. The two ends of the roller are rotatably connected to the bearing seats on the same side of different lifting platforms. A drive cylinder is installed at the bottom of the lifting groove to push the lifting platform to lift vertically and thus adjust the height of the roller.

6. The multi-wire submerged arc welding device for welded pipes according to claim 1, characterized in that: A height adjustment frame is fixedly installed on the top of the support frame. Inside the height adjustment frame is a screw lifting mechanism connected to the power source. The outer end of the welding arm extends into the height adjustment frame and is fixedly connected to the power output end of the screw lifting mechanism.

7. The multi-wire submerged arc welding device for welded pipes according to claim 1, characterized in that: The linear track is equipped with a lead screw moving mechanism connected to the power source, and the moving slider is fixedly connected to the power output end of the lead screw moving mechanism.

8. The multi-wire submerged arc welding device for welded pipes according to claim 1, characterized in that: The top of the material cylinder is equipped with a hopper, and a material pump is installed between the outlet of the hopper and the material cylinder. The bottom of the material cylinder is equipped with a discharge port that communicates with the outlet of the material pump.

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