AVC-OSC separated argon arc welding equipment

Abstract

The invention discloses AVC-OSC separated argon arc welding equipment. The AVC-OSC separated argon arc welding equipment comprises a rack, a clamping mechanism and a circular seam welding machine, wherein the clamping mechanism and the circular seam welding machine are arranged on the rack; a welding torch in the circular seam welding machine controls swing of a tungsten electrode tip in the welding torch through an OSC structure, and the welding torch in the circular seam welding machine controls the distance between the tungsten electrode tip in the welding torch and a circular seam through an AVC structure. A box body in the OSC structure is fixed on the rack, the circular seam welding machine is fixed in a sliding block in the OSC structure through a connecting seat, and the AVC structure is arranged on a rotating structure of the circular seam welding machine. According to the equipment, the OSC structure is arranged at the rear part of the circular seam welding machine, so that the OSC structure basically does not occupy the rotating space of the equipment, and the AVC structure is arranged at the head C-shaped structure of the welding operation part of the circular seam welding machine, so that the AVC structure basically does not occupy the rotating space of the equipment or occupies a small amount of the rotating space of the equipment; the device is suitable for welding operation occasions with the distance between pipe rows being 25 mm or above, and the application range is wider.

Description

Technical Field

[0001] The invention relates to argon arc welding equipment, in particular to AVC-OSC separation type argon arc welding equipment. Background Art

[0002] Since the accuracy of arc length control during welding directly affects the welding quality, automatic arc length tracking control (ARC VOLTAGE CONTROL, AVC) is a key factor in ensuring the quality of steel pipe welding and improving welding efficiency. The swing technology of automatic welding (OSCILLATION, OSC) is a key technology for achieving heat distribution and wide bead welding during welding.

[0003] At present, there are argon arc welding equipment with AVC structure and OSC structure on the market. The AVC structure and OSC structure are concentratedly arranged at or near the head C-shaped structure of the circumferential seam welder of the argon arc welding equipment where the welding operation is performed. This will cause the head C-shaped structure at or near the welding operation of the circumferential seam welder to be bulky, so the rotation space that needs to be reserved will also be larger, and usually at least 48mm of rotation space needs to be reserved. Therefore, this type of argon arc welding equipment with AVC structure and OSC structure can only be used in welding occasions where the spacing between pipe rows is 48mm or more, and it is powerless for welding occasions where the spacing between pipe rows is less than 48mm, and can only use traditional manual welding methods or give up welding methods and choose other methods. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an AVC-OSC separated argon arc welding equipment with a compact structure, flexible and reliable operation, which requires a small rotation space and can fully perform welding tasks in narrow welding working environments where the spacing between pipe rows is 25mm.

[0005] For a tube row structure composed of a series of tubes arranged in a line, such as a water-cooled wall, when a part of a tube is damaged, the traditional approach is to directly replace the complete tube row structure, but this method has a high replacement cost, so the best solution is to directly cut off the damaged part of the tube, and then replace a good part of the replacement tube. When the local replacement tube is connected to the cut-off part of the tube row structure, a circumferential welding method is usually used. Since the traditional argon arc welding equipment with AVC structure and OSC structure has the AVC structure and OSC structure arranged in the same area, the overall occupied space is relatively large, and inevitably occupies the rotation space, so it can only be used for welding occasions where the spacing between tube rows is 48mm or more. In order to improve the scope of application of argon arc welding equipment with AVC structure and OSC structure, this solution separates the AVC structure and OSC structure in different positions, thereby reducing the volume of the rotation space occupied by the AVC structure and OSC structure, so that it can be used when the spacing between tube rows is within the range of 25mm to 48mm.

[0006] A conventional argon arc welding device with an AVC structure and an OSC structure comprises: a frame, a clamping mechanism arranged on the frame, a girth welder, an OSC structure arranged on a rotating structure of the girth welder, and an AVC structure arranged on a rotating structure of the girth welder. The welding torch in the girth welder controls the swing and swing amplitude of the tungsten electrode tip in the welding torch through the OSC structure. The welding torch in the girth welder controls the distance between the tungsten electrode tip in the welding torch and the girth through the AVC structure.

[0007] The AVC-OSC separated argon arc welding equipment described in this solution improves the OSC structure and the AVC structure in the traditional argon arc welding equipment with AVC structure and OSC structure, and separates the two structures at different positions of the equipment to ensure that the AVC structure and the OSC structure basically do not occupy the rotation space of the equipment. The other necessary structures such as the wire feeding mechanism still use the traditional structure.

[0008] The OSC structure is as follows: a box is fixedly arranged on the frame, a first screw is vertically supported and arranged in the box through a first bearing group, and a first slider with an internal thread channel is screwed on the first screw through the internal thread channel; the front of the first slider is composed of a connecting part protruding forward in the middle and inclined planes arranged on the left and right sides of the connecting part, and a long installation groove is opened inward on each inclined plane, and a supporting plate is placed in each long installation groove, and a plurality of rolling body supporting holes are opened on the supporting plate, and each rolling body supporting hole is arranged in a line from top to bottom, and a rolling body is placed in each rolling body supporting hole; the sealing plate on the front side of the box is composed of a middle sealing plate and inclined sealing plates arranged on the left and right sides of the middle sealing plate. A long through slot is opened on the middle sealing plate, and the connecting part on the first slider passes through the long through slot and extends out of the long through slot, and the circumferential seam welder is fixed to the connecting part of the first slider through a connecting seat; the inclinations of the two inclined sealing plates correspond to the two side inclined planes on the first slider, and there is a gap between each inclined sealing plate and the corresponding inclined plane on the first slider; a slide plate is installed on the inner side of each inclined sealing plate, and the two slide plates are in contact with each rolling body in the long mounting groove on the corresponding side, and each rolling body is in rolling contact with the corresponding slide plate during the movement of the first slider in the up and down directions; a driving structure is provided in the box body for driving the first screw to rotate forward or reverse around its own axis, so that the first slider moves vertically from top to bottom or from bottom to top.

[0009] The AVC structure is as follows: an outer shell is fixedly arranged on the rotating structure of the girth welder, the outer shell is L-shaped formed by a first outer shell and a second outer shell, a worm driven by a first drive motor is arranged in the first outer shell, a slide groove with a second slider is arranged in the second outer shell, the base of the welding torch is fixedly connected to the second slider, an internal threaded through hole is opened on the second slider, a second screw supported in the second outer shell by a second bearing group is rotated in the internal threaded through hole, and a turbine fixed on the screw and the worm in the first outer shell form a worm gear transmission; the first outer shell, the second outer shell and the welding torch with a base form a semi-enclosed C-shaped surround, which is located at the C-shaped structure of the head of the girth welder where welding operations are performed, and basically does not extend beyond the C-shaped structure of the head of the girth welder where welding operations are performed.

[0010] Furthermore, in the aforementioned AVC-OSC separate argon arc welding equipment, the driving structure in the OSC structure is: a second driving motor is fixedly installed in the box body, a first gear is fixedly installed on the motor shaft of the second driving motor, and a second gear meshing with the first gear is fixedly installed on the first screw.

[0011] In order to accurately control the amplitude of the final relative swing of the tungsten pole, the present solution has an encoder fixedly installed in the box, and a third gear meshing with the first gear is fixedly installed on the shaft of the encoder; the travel of the first slider is accurately controlled by the encoder. In addition, in order to make the box occupy a smaller space, the present solution arranges the first screw, the second drive motor, and the encoder in the box in sequence from front to back.

[0012] In order to ensure that the first slider can move up and down smoothly and stably, the present scheme is provided with a pressure adjustment mechanism between each inclined sealing plate and the corresponding sliding plate, so that the sliding plate contacts the rolling elements in the corresponding elongated mounting groove at a certain set pressure; wherein, the pressure adjustment mechanism is: an elongated embedding groove is opened inwardly on the inner wall of the inclined sealing plate, the sliding plate is embedded in the elongated embedding groove, and a plurality of threaded through holes are opened on the outer wall of the inclined sealing plate, each threaded through hole passes through the bottom of the elongated embedding groove, and each threaded through hole is arranged in a straight line from top to bottom, and a screw is screwed into each threaded through hole, and the bottom of each screw is against the sliding plate.

[0013] Furthermore, in the aforementioned AVC-OSC separation argon arc welding equipment, the rolling body is a ball, and the rolling body support hole is a circular support through hole that can accommodate the ball.

[0014] Furthermore, in the aforementioned AVC-OSC separate argon arc welding equipment, the clamping mechanism is composed of two pipe clamping mechanisms; the two pipe clamping mechanisms are respectively located above and below the circumferential seam welding machine; at this time, the two pipes to be welded: pipe one to be welded and pipe two to be welded are respectively clamped by a pipe clamping mechanism, so there is no need to spot weld pipe one to be welded and pipe two to be welded first, determine the positions of the two first, and then clamp the AVC-OSC separate argon arc welding equipment, and the spot welding step before clamping the equipment can be omitted.

[0015] The structure of each pipe clamping mechanism includes: a fixed clamping jaw and a movable clamping jaw; the fixed clamping jaw is composed of a fixed connecting arm and a fixed gripping portion located at the front end of the fixed connecting arm, and a first hinged arm is arranged at the front end of the fixed connecting arm; the movable clamping jaw is composed of a movable connecting arm and a movable gripping portion located at the front end of the movable connecting arm, and a second hinged arm is arranged at the front end of the movable connecting arm; the first hinged arm and the second hinged arm are hinged, and a swinging structure is arranged between the fixed connecting arm and the movable connecting arm to drive the movable connecting arm to swing around the hinge point between the first hinged arm and the second hinged arm, so that the movable gripping portion approaches or moves away from the fixed gripping portion; In order to clamp the equipment more securely, in this solution, the clamping opening of the fixed clamping part and / or the clamping opening of the movable clamping part is a V-shaped clamping opening.

[0016] Further, the aforementioned AVC-OSC separate argon arc welding equipment, wherein the swing structure includes: a third screw and a movable block; a circle of annular groove is provided on the head of the third screw, a handle is fixedly installed on the tail of the third screw, a threaded hole is provided in the movable block, and the movable block is screwed on the third screw through the threaded hole; one end of the connecting rod is hinged to the rear end of the movable connecting arm, and the other end of the connecting rod is hinged to the movable block; a mounting hole and two limiting threaded holes are provided on the fixed connecting arm, and after the head of the third screw is extended into the mounting hole, two limiting screws are respectively screwed into the corresponding limiting threaded holes, and the two limiting screws screwed into the corresponding limiting threaded holes are stuck in the annular groove.

[0017] Furthermore, in the aforementioned AVC-OSC separate argon arc welding equipment, the fixed connecting arm, the fixed clamping part, and the first articulated arm are an integral structure formed by integral molding, and the movable connecting arm, the movable clamping part, and the second articulated arm are an integral structure formed by integral molding.

[0018] The frame is integrally formed by an upper mounting arm, a lower mounting arm, and a middle connecting arm connecting the upper mounting arm and the lower mounting arm; in order to simplify the overall structure and make the overall structure more compact, the fixed connecting arm of the pipe clamping mechanism located above the girth welder is the upper mounting arm of the frame; a connecting mounting arm is arranged on the lower mounting arm, and the connecting mounting arm and the lower mounting arm together constitute a fixed connecting arm of the pipe clamping mechanism located below the girth welder, and the mounting hole of the pipe clamping mechanism located below the girth welder and two limit threaded holes are located on the connecting mounting arm.

[0019] In view of the problem that the range of different pipe diameters to be welded is relatively large, since the travel range of the movable block is basically unchangeable, and in order to expand the range of applicable pipe diameters, the fixed clamping part is designed as a split structure, which is composed of a first connecting seat and a plurality of first clamping blocks of different heights. Any first clamping block can be fixed to the first connecting seat by a plurality of first fastening screws. At this time, the first clamping block with a matching height can be selected according to the different pipe diameters to be welded. Similarly, the movable clamping part is designed as a split structure, which is composed of a second connecting seat and a plurality of second clamping blocks of different heights. Any second clamping block can be fixed to the second connecting seat by a plurality of second fastening screws. At this time, the second clamping block with a matching height can be selected according to the different pipe diameters to be welded.

[0020] Wherein, the gripping opening of each first gripping block and / or the gripping opening of each second gripping block is a V-shaped gripping opening.

[0021] Furthermore, in the aforementioned AVC-OSC separated argon arc welding equipment, the structure of the welding torch with a base in the annular seam welding machine is as follows: a mounting block with conductive properties is fixedly arranged on the base, and the welding torch is mounted on the mounting block; a middle gas channel connected to the gas channel in the welding torch is opened inwardly on the rear side surface of the mounting block, and an air inlet pipe is installed on the inlet of the middle gas channel; a circulating water channel is opened inwardly on the rear side surface of the mounting block, and the circulating water channel surrounds the periphery of the middle gas channel and then re-penetrates the rear side surface of the mounting block to form a water outlet, and the water outlet is opened in the circulating water channel. A water inlet pipe with conductive properties is installed on the water inlet of the water channel, and a water outlet pipe with conductive properties is installed on the water outlet of the circulating water channel; there are three channels in the insulation layer of the wire that provides electrical energy to the tungsten electrode in the welding torch: the first channel, the second channel and the third channel, the first channel is sealed on the water inlet pipe, the second channel is sealed on the air inlet pipe, and the third channel is sealed on the water outlet pipe, and the bare copper wire of the wire is located in the first channel and the third channel. A clamp is also provided outside the insulation layer of the wire to firmly cover the insulation layer of the wire on the water inlet pipe, the air inlet pipe and the water outlet pipe.

[0022] The beneficial effects of the present invention are as follows: ① the first slider in the OSC structure abandons the traditional slide rail structure and adopts a guide rail-free ball and slide plate matching mode, which further reduces the space occupied by the box in terms of volume, making the OSC structure compact and flexible in operation; ② the OSC structure is arranged at the rear of the girth welder, so that the OSC structure basically does not occupy the rotation space of the equipment, and the AVC structure is arranged at the head C-shaped structure where the girth welder performs welding operations. The AVC structure basically does not exceed the head C-shaped structure where the girth welder performs welding operations, so the AVC structure basically does not occupy or occupies a small amount of the rotation space of the equipment, so the AVC-OSC separation structure greatly reduces the volume occupied by the rotation space, and is suitable for welding operations where the spacing between pipe rows is 25 mm or more, and has a wider range of applications; ③ the clamping mechanism in the equipment can realize automatic centering of two sections of pipes after clamping, omitting the manual centering process, and the centering accuracy is higher, and the annular welding process can be performed after clamping, simplifying the process, saving time, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an AVC-OSC separation type argon arc welding device described in the present invention.

[0024] Figure 2 It is a structural schematic diagram of an AVC-OSC separation argon arc welding device described in the present invention when viewed from another observation direction.

[0025] Figure 3 It is a structural schematic diagram after the girth welder is fixed on the first slide block of the OSC structure.

[0026] Figure 4 It is a structural diagram of the OSC structure.

[0027] Figure 5 yes Figure 4 Schematic diagram of the internal structure after removing the box.

[0028] Figure 6 yes Figure 4 Schematic diagram of the plane in the A direction.

[0029] Figure 7 yes Figure 6 Schematic diagram of the structure in the BB section direction.

[0030] Figure 8 yes Figure 7 Schematic diagram of the local enlarged structure of part C in the middle.

[0031] Fig. 9 yes Figure 6 Schematic diagram of the structure from the right side.

[0032] Fig.10 yes Fig. 9 Schematic diagram of the structure in the DD section direction.

[0033] Fig.11 yes Fig.10 Schematic diagram of the local enlarged structure of part E in the middle.

[0034] Fig.12 yes Figure 2 Schematic diagram of the plane in the F direction.

[0035] Fig.13 yes Fig.12 Schematic diagram of the structure in the GG section direction.

[0036] Fig.14 It is a schematic diagram of the internal structure of the AVC structure after removing the outer shell.

[0037] Fig.15 yes Figure 1 Schematic diagram of the plan from top view.

[0038] Fig.16 yes Fig.15 Schematic diagram of the local cross-sectional structure in the HH cross-sectional direction.

[0039] Fig.17 It is a partial structural schematic diagram of a welding torch with a base.

[0040] Fig.18 yes Fig.17 Schematic diagram of the structure in the II section direction.

[0041] Fig.19 yes Fig.17Schematic diagram of the structure looking upward.

[0042] Fig. 20 yes Fig.19 Schematic diagram of the structure in the JJ section direction.

[0043] in: 1. Frame; 11. Upper mounting arm; 12. Lower mounting arm; 13. Middle connecting arm; 14. Connecting mounting arm; 2. Pipe clamping mechanism; 21. Upper pipe clamping mechanism; 211. Fixed connecting arm; 212. Fixed clamping part; 213. First articulated arm; 2121. First connecting seat; 2122. First clamping block; 22. Lower pipe clamping mechanism; 221. Active connecting arm; 222. Active clamping part; 223. Second articulated arm; 2221. Second connecting seat; 2222, second gripping block; 23, third screw; 231, annular groove; 24, movable block; 25, handle; 26, connecting rod; 27, mounting hole; 28, limiting threaded hole; 281, limiting screw; 3, girth welder; 31, connecting seat; 4, welding torch; 41, tungsten electrode; 42, base; 43, mounting block; 431, middle gas channel; 432, air inlet pipe; 433, circulating water channel; 434, water inlet pipe; 435, water outlet pipe; 44, gas channel; 5, box; 51, first screw; 511, second gear; 52, first slider; 521, connecting part; 522, inclined plane; 523, long mounting groove; 53, support plate; 531, rolling element support hole; 54, rolling element; 55, middle sealing plate; 551, long through groove; 56, inclined sealing plate; 561, long embedded groove; 562, threaded through hole; 563, screw; 57, slide plate; 58, second drive motor; 581, first gear; 59, encoder; 591, third gear; 6, outer shell; 61, first part of outer shell; 62, second part of outer shell; 63, first drive motor; 64, worm; 65, second screw; 66, turbine; 67, second slider; 68, slide; 7, wire; 70, insulation layer; 71, first channel; 72, second channel; 73, third channel; 8, clamp; 101, pipe to be welded 1; 102, pipe to be welded 2; 103, annular seam; DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0045] To facilitate the description of the positional relationship between the components, Figure 1 The coordinate system is established in Figure 1The coordinate system shown defines the relative positions of the components by indicating the directions of "left", "right", "front", "back", "up" and "down". It should be noted that the directions defined here are only for the convenience of describing the relative positions of the components, and do not limit the installation direction of the equipment. The installation direction of the equipment is determined according to the actual position and angle of the pipe row. Embodiment 1

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, an AVC-OSC separation argon arc welding device described in this embodiment includes: a frame 1, a clamping mechanism arranged on the frame 1, and a girth welder 3. The girth welder 3 described in this embodiment belongs to an existing mature structure. The girth welder 3 is clamped at the pipe 101 to be welded and the pipe 2 102 to be welded by the clamping mechanism. The welding torch 4 is driven to rotate by the rotating structure of the girth welder 3. After the girth welder 3 is running, when the tungsten electrode 41 in the welding torch 4 rotates one circle, a circle of annular welds is formed at the girth 103 between the pipe 101 to be welded and the pipe 2 102 to be welded. The welding torch 4 in the girth welder 3 controls the swing and swing amplitude of the tungsten electrode tip in the welding torch 4 through the OSC structure, and the welding torch 4 in the girth welder 3 controls the distance between the tungsten electrode tip in the welding torch 4 and the girth 103 through the AVC structure.

[0047] Among them, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the OSC structure in this embodiment is as follows: a box body 5 is fixedly arranged on the frame 1, a first screw rod 51 is vertically supported and arranged in the box body 5 through a first bearing group, and a first slider 52 with an internal thread channel is screwed on the first screw rod 51 through the internal thread channel. The front of the first slider 52 is composed of a connecting portion 521 protruding forward in the middle and inclined planes 522 arranged on the left and right sides of the connecting portion 521. A long installation groove 523 is opened inward on each inclined plane 522, and a supporting plate 53 is placed in each long installation groove 523. A plurality of rolling body supporting holes 531 are opened on the supporting plate 53, and each rolling body supporting hole 531 is arranged in a line from top to bottom. A rolling body 54 is placed in each rolling body supporting hole 531. At this time, the supporting plate 53 plays a role in separating the rolling bodies 54, ensuring that the rolling bodies 54 do not interfere with each other and roll separately. In this embodiment, the rolling body 54 is preferably a ball. At this time, the rolling body support hole 531 is a circular support through hole that can accommodate the ball.

[0048] In addition, the inclined planes 522 arranged on the left and right sides of the connecting portion 521 can be arranged symmetrically on the left and right sides of the connecting portion 521, or can be arranged asymmetrically on the left and right sides of the connecting portion 521. It is preferred that the inclined planes 522 arranged on the left and right sides of the connecting portion 521 are arranged symmetrically with respect to the vertical center plane of the connecting portion 521, and the angle between any inclined plane 522 and the vertical center plane of the connecting portion 521 is 45°, see Figure 5 and Fig.10 shown.

[0049] like Figure 1 , Figure 4 , Fig.10 and Fig.11 As shown, the sealing plate on the front side of the box body 5 is composed of a middle sealing plate 55 and inclined sealing plates 56 arranged on the left and right sides of the middle sealing plate 55. An elongated through slot 551 is provided on the middle sealing plate 55. The connecting portion 521 on the first slider 52 passes through the elongated through slot 551 and then extends out of the elongated through slot 551. The girth welder 3 is fixed to the connecting portion 521 of the first slider 52 through the connecting seat 31. The inclinations of the two inclined sealing plates 56 correspond to the two side inclined planes 522 on the first slider 52, and there is a gap between each inclined sealing plate 56 and the corresponding inclined plane 522 on the first slider 52. A slide plate 57 is installed on the inner side of each inclined sealing plate 56, and the two slide plates 57 are in contact with each rolling body 54 in the elongated mounting groove 523 on the corresponding side. At this time, the first slider 52 is circumferentially restricted by the two slides 57 and the rolling bodies 54 in the two elongated mounting grooves 523 and cannot rotate circumferentially. It can only be forced to move axially along the axis direction of the first screw 51 when the first screw 51 rotates. During the axial sliding of the first slider 52, each rolling body 54 is in rolling contact with the corresponding slide 57.

[0050] like Figure 5 As shown, a driving structure for driving the first screw 51 to rotate forward or reversely around its own axis, thereby moving the first slider 52 vertically from top to bottom or from bottom to top, is provided in the box body 5. The driving structure comprises: a second driving motor 58 is fixedly installed in the box body 5, a first gear 581 is fixedly installed on the motor shaft of the second driving motor 58, and a second gear 511 meshing with the first gear 581 is fixedly installed on the first screw 51.

[0051] In order to accurately control the stroke of the first slider 52, the present embodiment further has an encoder 59 fixedly installed in the box body 5, and a third gear 591 meshing with the first gear 581 is fixedly installed on the shaft of the encoder 59; the first screw 51, the second drive motor 58, and the encoder 59 are arranged in sequence from front to back in the box body 5, thereby making the overall structure of the box body 5 more compact and small.

[0052] In order to ensure that the first slider 52 can slide up and down smoothly without shaking or sliding smoothly, in this embodiment, a pressure adjustment mechanism is provided between each inclined sealing plate 56 and the corresponding slider 57 to make the slider 57 contact with each rolling element 54 in the corresponding elongated mounting groove 523 at a certain set pressure. Fig.10 and Fig.11 As shown, the pressure regulating mechanism described in this embodiment is: an elongated embedding groove 561 is opened inwardly on the inner wall of the inclined sealing plate 56, and the slide plate 57 is embedded in the elongated embedding groove 561, and a plurality of threaded through holes 562 are opened on the outer wall of the inclined sealing plate 56, each threaded through hole 562 passes through the bottom of the elongated embedding groove 561, and each threaded through hole 562 is arranged in a straight line from top to bottom, and a screw 563 is screwed into each threaded through hole 562, and the bottom of each screw 563 is against the slide plate 57.

[0053] like Figure 2 , Figure 3 , Fig.13 and Fig.14 As shown, the AVC structure is as follows: an outer shell 6 is fixedly arranged on the rotating structure of the annular seam welder 3, and the outer shell 6 is L-shaped by a first part outer shell 61 and a second part outer shell 62, and the cavity of the first part outer shell 61 is connected to the cavity of the second part outer shell 62. The first drive motor 63 is fixedly arranged in the cavity of the first part outer shell 61, and a worm 64 is fixedly arranged on the motor shaft of the first drive motor 63. A slide groove 68 and a second slider 67 that can slide in the slide groove 68 are arranged in the second part outer shell 62, the base 42 of the welding torch 4 is fixedly connected to the second slider 67, and an internal threaded through hole penetrating in the left and right directions is opened in the second slider 67, the second screw 65 is supported in the outer shell 6 by a second bearing group, and the second screw 65 is also rotated in the internal threaded through hole on the second slider 67, and a turbine 66 is also fixedly arranged on the second screw 65, and the turbine 66 and the worm 64 form a worm gear transmission. In order to further reduce the space required for the rotation of the AVC-OSC separate argon arc welding equipment, the first part of the outer shell 61, the second part of the outer shell 62, and the welding torch 4 with the base 42 form a semi-enclosed C-shaped surrounding ring, and the C-shaped surrounding ring matches the outer contour of the C-shaped structure of the head of the annular welder 3 where the welding operation is performed.

[0054] The AVC-OSC separation argon arc welding equipment described in this embodiment has the following main advantages: First, the first slider 52 in the OSC structure abandons the traditional slide rail structure and adopts a guide rail-free ball and slide plate 57 cooperation mode, which further reduces the space occupied by the box 5 in terms of volume, making the OSC structure compact and flexible in operation.

[0055] Second, the OSC structure is arranged at the rear of the girth welder 3, so the OSC structure basically does not occupy the rotation space of the equipment, and the AVC structure is arranged at the head C-shaped structure of the girth welder 3 where the welding operation is performed. The AVC structure basically does not exceed the head C-shaped structure of the girth welder 3 where the welding operation is performed, so the AVC structure basically does not occupy or occupies a small amount of the rotation space of the equipment. Therefore, the AVC-OSC separated structure greatly reduces the volume occupied by the rotation space, and is therefore suitable for welding operations where the spacing between pipe rows is 25 mm or more, and has a wider range of applications. Embodiment 2

[0056] When the argon arc welding equipment is used to weld two sections of pipes, it is necessary to first align the two sections of pipes, then connect them by spot welding, and finally clamp the argon arc welding equipment for circular welding. On the other hand, the clamping structure on the traditional argon arc welding equipment also occupies a large volume, and has certain requirements for the pipe spacing between the pipe rows. In view of the above two main problems, this embodiment is designed on the basis of the first embodiment with respect to the structure of the clamping mechanism.

[0057] like Fig.12 As shown, the clamping mechanism 2 in this embodiment is composed of two pipe clamping mechanisms 2; the two pipe clamping mechanisms 2 are respectively located above and below the girth welder 3. For the convenience of description, the pipe clamping mechanism located above the girth welder 3 is defined as an upper pipe clamping mechanism 21, and the pipe clamping mechanism located below the girth welder 3 is defined as a lower pipe clamping mechanism 22.

[0058] like Figure 1 and Figure 2 As shown, the structure of each pipe clamping mechanism 2 in this embodiment includes: two clamping jaws, which are respectively: a fixed clamping jaw and a movable clamping jaw; the fixed clamping jaw is composed of a fixed connecting arm 211 and a fixed gripping portion 212 located at the front end of the fixed connecting arm 211, and a first hinged arm 213 is provided at the front section of the fixed connecting arm 211. The movable clamping jaw is composed of a movable connecting arm 221 and a movable gripping portion 222 located at the front end of the movable connecting arm 221, and a second hinged arm 223 is provided at the front section of the movable connecting arm 221. The first hinged arm 213 and the second hinged arm 223 are hinged, and a swinging structure is provided between the fixed connecting arm 211 and the movable connecting arm 221 to drive the movable connecting arm 223 to swing around the hinge point between the first hinged arm 213 and the second hinged arm 223, so that the movable gripping portion 222 approaches or moves away from the fixed gripping portion 212. The clamping opening of the fixed clamping part 212 and / or the clamping opening of the movable clamping part 222 is a V-shaped clamping opening, so as to better clamp on the pipe 1 101 to be welded and the pipe 2 102 to be welded.

[0059] like Figure 1 , Figure 2 , Fig.15 and Fig.16 As shown, the swing structure includes: a third screw rod 23 and a movable block 24. A circle of annular groove 231 is provided on the head of the third screw rod 23, a handle 25 is fixedly installed at the tail of the third screw rod 23, a threaded hole is provided in the movable block 24, and the movable block 24 is screwed on the third screw rod 23 through the threaded hole; one end of the connecting rod 26 is hinged to the rear end of the movable connecting arm 221, and the other end of the connecting rod 26 is hinged to the movable block 24. A mounting hole 27 and two limiting threaded holes 28 are provided on the fixed connecting arm 211. After the head of the third screw rod 23 extends into the mounting hole 27, two limiting screws 281 are respectively screwed into the corresponding limiting threaded holes 28, and the two limiting screws 281 screwed into the corresponding limiting threaded holes 28 are stuck in the annular groove 231. At this time, the axial position of the third screw rod 23 is limited by the two limiting screws 281 and the annular groove 231, so that the third screw rod 23 can only rotate under the action of external force but cannot move axially.

[0060] The fixed connecting arm 211, the fixed clamping portion 212, and the first hinged arm 213 can be separate or partially separate, and then connected as a whole by some fastening methods such as welding, riveting, screw connection, etc. The fixed connecting arm 211, the fixed clamping portion 212, and the first hinged arm 213 can also be an integral structure formed by one-piece molding. In this embodiment, the latter integral structure formed by one-piece molding is preferred.

[0061] Similarly, the movable connecting arm 221, the movable clamping part 222, and the second hinged arm 223 can be separate or partially separate, and then connected as a whole by some fastening methods such as welding, riveting, screw connection, etc. The movable connecting arm 221, the movable clamping part 222, and the second hinged arm 223 can also be an integral structure formed by one-piece molding. This embodiment preferably uses the latter integral structure formed by one-piece molding.

[0062] like Figure 1 , Figure 2 and Fig.12 As shown, the frame 1 in this embodiment is formed by an upper mounting arm 11, a lower mounting arm 12, and a middle connecting arm 13 connecting the upper mounting arm 11 and the lower mounting arm 12. The fixed connecting arm 211 of the pipe clamping mechanism located above the girth welder 3 is the upper mounting arm 11 of the frame 1; the fixed connecting arm 211 of the pipe clamping mechanism located below the girth welder 3 is the lower mounting arm 12 of the frame 1.

[0063] On the basis of the above, this solution is provided with a connecting mounting arm 14 on the lower mounting arm 12. The connecting mounting arm 14 and the lower mounting arm 12 together constitute a fixed connecting arm 211 of the pipe clamping mechanism located below the girth welder 3. The mounting hole 27 and two limiting threaded holes 28 of the pipe clamping mechanism located below the girth welder 3 are located on the connecting mounting arm 14.

[0064] The AVC-OSC separate argon arc welding equipment adopts the above-mentioned clamping mechanism, which can realize automatic centering of the two sections of pipes after clamping, omitting the manual centering process and achieving higher centering accuracy. The circular welding process can be carried out immediately after clamping, simplifying the process, saving time and improving work efficiency. Embodiment 3

[0065] In actual use, the pipes in the pipe bank are matched with different pipe diameters according to the actual use scenarios, and the pipe clamping mechanism 2 in the second embodiment is limited by the stroke of the spiral transmission composed of the third screw 23 and the movable block 24, so the pipe diameter range of the applicable pipe bank is small. In order to expand the scope of application, this embodiment adopts the following scheme based on the structure of the second embodiment: Fig.15 As shown, the fixed clamping part 212 is designed to be composed of a first connection seat 2121 and a plurality of first clamping blocks 2122 of different heights, and any first clamping block 2122 can be fixed to the first connection seat 2121 by a plurality of first fastening screws. In actual use, the first clamping block 2122 of a suitable height can be adapted according to different pipes. Similarly, the movable clamping part 222 is designed to be composed of a second connection seat 2221 and a plurality of second clamping blocks 2222 of different heights, and any second clamping block 2222 can be fixed to the second connection seat 2221 by a plurality of second fastening screws. In actual use, the second clamping block 2222 of a suitable height can be adapted according to different pipes.

[0066] At this time, the gripping openings of the first gripping blocks 2122 and / or the gripping openings of the second gripping blocks 2222 are V-shaped gripping openings. The rest of the structure is the same as that of the second embodiment. Embodiment 4

[0067] This embodiment is based on the first embodiment, the second embodiment or the third embodiment, and further designs the structure of the welding torch, designs a water cooling structure and a gas protection structure.

[0068] like Fig.17 , Fig.18 , Fig.19 and Fig. 20As shown, the structure of the welding torch 4 with the base 42 in the girth welder 3 described in this embodiment is as follows: a mounting block 43 with conductive properties is fixedly arranged on the base 42, and the welding torch 4 is mounted on the mounting block 43. A middle gas channel 431 communicating with the gas channel 44 in the welding torch 4 is opened inwardly on the rear side of the mounting block 43, and an air inlet pipe 432 is installed on the inlet of the middle gas channel 431; a circulating water channel 433 is opened inwardly on the rear side of the mounting block 43, and the circulating water channel 433 surrounds the periphery of the middle gas channel 431 and then re-penetrates the rear side of the mounting block 43 to form a water outlet, and a water inlet pipe 434 with conductive properties is installed on the water inlet of the circulating water channel 433, and a water outlet pipe 435 with conductive properties is installed on the water outlet of the circulating water channel 433. There are three channels in the insulating layer 70 of the wire 7 that provides electrical energy to the tungsten electrode 41 in the welding torch 4: the first channel 71, the second channel 72 and the third channel 73. The first channel 71 is sealed on the water inlet pipe 434, the second channel 72 is sealed on the air inlet pipe 432, and the third channel 73 is sealed on the water outlet pipe 435. The bare copper wire of the wire 7 is located in the first channel 71 and the third channel 73. A clamp 8 is provided outside the insulating layer 70 of the wire 7 to firmly cover the insulating layer 70 of the wire 7 on the water inlet pipe 434, the air inlet pipe 432 and the water outlet pipe 435.

[0069] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An AVC-OSC separated argon arc welding device, comprising: A frame, a clamping mechanism arranged on the frame, and a girth welder; The welding torch in the annular seam welding machine controls the swing of the tungsten electrode tip in the welding torch through the OSC structure, and controls the distance between the tungsten electrode tip and the annular seam in the welding torch through the AVC structure; the characteristic is that the OSC structure is: a box is fixedly arranged on the frame, the first screw is vertically supported and arranged in the box through the first bearing group, and the first slider with an internal thread channel is screwed on the first screw through the internal thread channel; the front of the first slider is composed of a connecting part protruding forward in the middle part and inclined planes arranged on the left and right sides of the connecting part, and an elongated mounting groove is opened inwardly on each inclined plane, and a supporting plate is placed in each elongated mounting groove, and a plurality of rolling element supporting holes are opened on the supporting plate, and the rolling element supporting holes are arranged in a line from top to bottom, and a rolling element is placed in each rolling element supporting hole. The box body comprises a sealing plate on the front side thereof and inclined sealing plates arranged on the left and right sides of the middle sealing plate; an elongated through slot is provided on the middle sealing plate, and the connecting portion on the first slider passes through the elongated through slot and extends out of the elongated through slot; the circumferential seam welder is fixed to the connecting portion of the first slider through a connecting seat; the inclinations of the two inclined sealing plates correspond to the inclined planes on the two sides of the first slider, and a gap is left between each inclined sealing plate and the corresponding inclined plane on the first slider; a slide plate is installed on the inner side of each inclined sealing plate, and the two slide plates are in contact with each rolling body in the elongated mounting groove on the corresponding side, and each rolling body is in rolling contact with the corresponding slide plate during the movement of the first slider in the up-and-down direction; a driving structure is provided in the box body for driving the first screw to rotate forward or reversely around its own axis, so that the first slider moves vertically from top to bottom or from bottom to top; The AVC structure is as follows: an outer shell is fixedly arranged on the rotating structure of the girth welder, the outer shell is L-shaped formed by a first outer shell and a second outer shell, a worm driven by a first drive motor is arranged in the first outer shell, a slide groove with a second slider is arranged in the second outer shell, the base of the welding torch is fixedly connected to the second slider, an internal threaded through hole is opened on the second slider, a second screw supported in the second outer shell by a second bearing group is rotated in the internal threaded through hole, and a turbine fixed on the screw and the worm in the first outer shell form a worm gear transmission; the first outer shell, the second outer shell and the welding torch with a base form a semi-enclosed C-shaped surround.

2. The AVC-OSC separation argon arc welding equipment according to claim 1, characterized in that: The driving structure is as follows: a second driving motor is fixedly installed in the box body, a first gear is fixedly installed on the motor shaft of the second driving motor, and a second gear meshing with the first gear is fixedly installed on the first screw.

3. The AVC-OSC separation argon arc welding equipment according to claim 2, characterized in that: An encoder is fixedly installed in the box, and a third gear meshing with the first gear is fixedly installed on the shaft of the encoder; the first screw rod, the second drive motor and the encoder are arranged in sequence from front to back in the box.

4. The AVC-OSC separation argon arc welding equipment according to claim 1, characterized in that: A pressure regulating mechanism is provided between each inclined sealing plate and the corresponding sliding plate so that the sliding plate contacts the rolling elements in the corresponding elongated mounting groove at a certain set pressure; The pressure regulating mechanism is as follows: an elongated embedding groove is opened inwardly on the inner wall of the inclined sealing plate, the slide plate is embedded in the elongated embedding groove, and a plurality of threaded through holes are opened on the outer wall of the inclined sealing plate, each threaded through hole passes through the bottom of the elongated embedding groove, and each threaded through hole is arranged in a straight line from top to bottom, a screw is screwed into each threaded through hole, and the bottom of each screw is against the slide plate.

5. The AVC-OSC separation argon arc welding equipment according to claim 1 or 4, characterized in that: The rolling body is a ball, and the rolling body support hole is a circular support through hole capable of accommodating the ball.

6. The AVC-OSC separation argon arc welding equipment according to claim 1, characterized in that: The clamping mechanism is composed of two pipe clamping mechanisms; the two pipe clamping mechanisms are respectively located above and below the girth welder; The structure of each pipe clamping mechanism includes: a fixed clamping jaw and a movable clamping jaw; the fixed clamping jaw is composed of a fixed connecting arm and a fixed gripping portion located at the front end of the fixed connecting arm, and a first hinged arm is arranged at the front end of the fixed connecting arm; the movable clamping jaw is composed of a movable connecting arm and a movable gripping portion located at the front end of the movable connecting arm, and a second hinged arm is arranged at the front end of the movable connecting arm; the first hinged arm and the second hinged arm are hinged, and a swinging structure is arranged between the fixed connecting arm and the movable connecting arm to drive the movable connecting arm to swing around the hinge point between the first hinged arm and the second hinged arm, so that the movable gripping portion approaches or moves away from the fixed gripping portion; The clamping opening of the fixed clamping part and / or the clamping opening of the movable clamping part is a V-shaped clamping opening.

7. The AVC-OSC separation argon arc welding equipment according to claim 6, characterized in that: The swing structure includes: a third screw and a movable block; a circle of annular groove is provided on the head of the third screw, a handle is fixedly installed at the tail of the third screw, a threaded hole is provided in the movable block, and the movable block is screwed on the third screw through the threaded hole; one end of the connecting rod is hinged to the rear end of the movable connecting arm, and the other end of the connecting rod is hinged to the movable block; a mounting hole and two limiting threaded holes are provided on the fixed connecting arm, and after the head of the third screw is extended into the mounting hole, two limiting screws are respectively screwed into the corresponding limiting threaded holes, and the two limiting screws screwed into the corresponding limiting threaded holes are stuck in the annular groove.

8. The AVC-OSC separation argon arc welding equipment according to claim 6, characterized in that: The fixed connecting arm, the fixed clamping part and the first hinged arm are an integral structure formed by integral molding, and the movable connecting arm, the movable clamping part and the second hinged arm are an integral structure formed by integral molding; The frame is integrally formed by an upper mounting arm, a lower mounting arm, and a middle connecting arm connecting the upper mounting arm and the lower mounting arm; the fixed connecting arm of the pipe clamping mechanism located above the girth welder is the upper mounting arm of the frame; a connecting mounting arm is arranged on the lower mounting arm, and the connecting mounting arm and the lower mounting arm together constitute the fixed connecting arm of the pipe clamping mechanism located below the girth welder, and the mounting hole of the pipe clamping mechanism located below the girth welder and two limiting threaded holes are located on the connecting mounting arm.

9. A AVC-OSC separation argon arc welding equipment according to claim 6, 7 or 8, characterized in that: The fixed clamping part is composed of a first connection seat and a plurality of first clamping blocks of different heights, and any first clamping block can be fixed to the first connection seat by a plurality of first fastening screws; the movable clamping part is composed of a second connection seat and a plurality of second clamping blocks of different heights, and any second clamping block can be fixed to the second connection seat by a plurality of second fastening screws; The gripping opening of each first gripping block and / or the gripping opening of each second gripping block is a V-shaped gripping opening.

10. The AVC-OSC separation argon arc welding equipment according to claim 1, characterized in that: The structure of the welding torch with a base in the girth welder is as follows: a mounting block with conductive properties is fixedly arranged on the base, and the welding torch is mounted on the mounting block; a middle gas channel connected to the gas channel in the welding torch is opened inwardly on the rear side of the mounting block, and an air inlet pipe is installed on the inlet of the middle gas channel; a circulating water channel is opened inwardly on the rear side of the mounting block, and the circulating water channel surrounds the periphery of the middle gas channel and then re-penetrates the rear side of the mounting block to form a water outlet, and a conductive gas pipe is installed on the water inlet of the circulating water channel. A water inlet pipe with good performance is installed on the water outlet of the circulating water channel. There are three channels in the insulation layer of the wire that provides electric energy to the tungsten electrode in the welding torch: the first channel, the second channel and the third channel. The first channel is sealed on the water inlet pipe, the second channel is sealed on the air inlet pipe, and the third channel is sealed on the water outlet pipe. The bare copper wire of the wire is located in the first channel and the third channel. A clamp is arranged outside the insulation layer of the wire to firmly cover the insulation layer of the wire on the water inlet pipe, the air inlet pipe and the water outlet pipe.

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