A narrow gap submerged arc welding machine

Abstract

The present invention discloses a narrow gap submerged arc welding machine, and specifically relates to the technical field of submerged arc welding machines, comprising a workbench, wherein a first fixing and rotating mechanism is fixedly installed on one side of the top of the workbench, and a second fixing and rotating mechanism is fixedly installed on the other side of the top of the workbench, a connecting base plate is provided between the first fixing and rotating mechanism and the second fixing and rotating mechanism, and a first tubular welding part is detachably installed in the first fixing and rotating mechanism. The present invention, by setting a first fixing and rotating mechanism and a second fixing and rotating mechanism with the same structure and using a processing mechanism in cooperation, respectively performs rolling positioning on the first tubular welding part and the second tubular welding part, improves the stability of the first tubular welding part and the second tubular welding part during welding, and facilitates the rotation of the first tubular welding part and the second tubular welding part, performs rotational welding on the first tubular welding part and the second tubular welding part, and improves the welding stability, efficiency and effect between the tubular welding parts.

Description

Technical Field

[0001] The invention relates to the technical field of submerged arc welding machines, in particular to a narrow gap submerged arc welding machine. Background Art

[0002] Submerged arc welding machine is a welding machine that uses electric arc burning under the flux layer to weld. Its inherent advantages such as stable welding quality, high welding productivity, no arc light and little smoke make it the main welding machine in the production of pressure vessels, pipe section manufacturing, box beam column steel structure, etc.

[0003] When using a submerged arc welding machine to weld tubular parts, most of the time, a positioning mechanism is used to position two tubular parts, leaving a narrow gap between them. After positioning, narrow gap submerged arc welding is performed on the tubular parts. Due to the positioning of the tubular parts, the angles of the tubular parts on both sides need to be rotated back and forth during welding. The tubular parts on both sides need to be fully welded, which is more troublesome and prone to errors. The welding efficiency and welding quality are relatively low. After welding, waste will appear at the welding point, which needs to be cleaned manually, which is more troublesome. For this reason, we propose a narrow gap submerged arc welding machine to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a narrow gap submerged arc welding machine to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a narrow gap submerged arc welding machine, comprising a workbench, a first fixing and rotating mechanism is fixedly installed on one side of the top of the workbench, a second fixing and rotating mechanism is fixedly installed on the other side of the top of the workbench, a connecting base plate is provided between the first fixing and rotating mechanism and the second fixing and rotating mechanism, a first tubular welding part is detachably installed in the first fixing and rotating mechanism, a second tubular welding part is detachably installed in the second fixing and rotating mechanism, a supporting side frame is fixedly installed in the middle part of the top of the workbench, and a processing mechanism is fixedly installed on the supporting side frame.

[0006] Preferably, the second fixed and rotating mechanism includes a fixed and rotating ring frame, a placement groove is provided on the top of the fixed and rotating ring frame, a cavity is provided in the fixed and rotating ring frame, a plurality of positioning frames distributed in a ring array are provided on the inner side sliding card of the fixed and rotating ring frame, the opposite ends of the plurality of positioning frames extend into the cavity, a driving ring is rotatably provided in the cavity, a planar threaded protrusion is provided on one side of the driving ring, a planar threaded groove used in conjunction with the planar threaded protrusion is provided on one side of the plurality of positioning frames close to the driving ring, the planar threaded protrusion is movably connected in the planar threaded groove, a U-shaped frame is fixedly installed on the opposite ends of the plurality of positioning frames, a rotating shaft is rotatably installed on the U-shaped frame, and a positioning wheel is coaxially and fixedly installed on the rotating shaft.

[0007] Preferably, the second fixed and rotating mechanism also includes a fixed bottom frame, which is fixedly installed on the bottom of the fixed and rotating ring frame, and the fixed bottom frame is fixedly installed on the top of the workbench. The outer fixed sleeve of the driving ring is provided with a driven gear ring, and a driving shaft is rotatably installed in the fixed bottom frame. The outer fixed sleeve of the driving shaft is provided with a driving gear meshing with the driven gear ring.

[0008] Preferably, L-shaped connecting frames are vertically mounted on opposite ends of the plurality of positioning frames, auxiliary wheels are rotatably mounted on the ends of the L-shaped connecting frames, and the second tubular welded piece is movably clamped between the plurality of positioning wheels and the plurality of auxiliary wheels.

[0009] Preferably, a driven worm gear is coaxially fixedly mounted on the end of one of the rotating shafts, a driving worm is meshingly connected to the bottom of the driven worm gear, the driving worm is rotatably mounted on the outside of the corresponding U-shaped frame, a first motor is fixedly mounted on the outside of the U-shaped frame, and the driving end of the first motor and the driving worm are coaxially fixedly mounted.

[0010] Preferably, the tops of the driving ring and the driven gear ring are also provided with slots for placing objects.

[0011] Preferably, the first fixing and rotating mechanism and the second fixing and rotating mechanism have the same structure, and the first tubular welding piece is movably connected between a plurality of positioning wheels and a plurality of auxiliary wheels on the first fixing and rotating mechanism.

[0012] Preferably, the connecting bottom plate is fixedly installed between the first fixing and rotating mechanism and the second fixing and rotating mechanism and the fixed bottom frame.

[0013] Preferably, a transverse axis is provided between the driving shafts of the first and second fixed and rotating mechanisms, cross blocks are fixedly installed at both ends of the transverse axis, cross slots corresponding to the cross blocks are provided on opposite sides of the driving shafts of the first and second fixed and rotating mechanisms, the cross blocks are movably engaged in the corresponding cross slots, a crown gear is fixedly sleeved on the outer side of the transverse axis, a second motor is fixedly installed on the side of the top end of the workbench close to the crown gear, and a transmission gear meshing with the crown gear is fixedly installed on the driving end of the second motor.

[0014] Preferably, the processing mechanism includes a processing top frame, the processing top frame is fixedly mounted on the top of the supporting side frame, the bottom end of the processing top frame is fixedly mounted with a first linear electric cylinder, the driving end of the first linear electric cylinder is fixedly mounted with an L-shaped rear frame, the second linear electric cylinder is fixedly mounted on the L-shaped rear frame, and the driving end of the second linear electric cylinder is fixedly mounted with a buffer frame, one side of the buffer frame is slidingly clamped with a buffer slide, the buffer frame is fixedly clamped with a guide shaft, the buffer slide is slidably sleeved on the outside of the guide shaft, the outside of the guide shaft at the top and bottom ends of the buffer slide are both provided with springs, the end of the buffer slide is fixedly clamped with a welding head, the side end of the buffer slide is fixedly mounted with a first L-shaped frame, the end of the first L-shaped frame is fixedly mounted with a distance rod by bolts, the bottom rolling card of the distance rod is provided with a ball, the side end of the buffer frame is fixedly mounted with a second L-shaped frame, and the end of the second L-shaped frame is fixedly mounted with a waste discharge cutter head by bolts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting a first fixed rotation mechanism and a second fixed rotation mechanism with the same structure, and using a processing mechanism in conjunction, the first tubular welding part and the second tubular welding part are respectively positioned in a rolling manner, so as to improve the stability of the first tubular welding part and the second tubular welding part during welding, and facilitate the rotation of the first tubular welding part and the second tubular welding part, and the first tubular welding part and the second tubular welding part are rotated to perform welding, so as to improve the welding stability, efficiency and effect between the tubular welding parts;

[0017] 2. By setting up a processing mechanism and adjusting the position of the waste discharge cutter head, the waste discharge cutter head is placed at the welding position. After the welding is completed, the first tubular welding part and the second tubular welding part rotate, and the waste discharge cutter head automatically cleans the waste at the welding position in a rolling manner, thereby effectively improving the welding effect between the tubular welding parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structural connection of the first fixed rotation mechanism and the second fixed rotation mechanism in the present invention,

[0021] Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle.

[0022] Figure 4 For the present invention Figure 2 The enlarged view of point B in the middle.

[0023] Figure 5 FIG. 2 is another structural connection diagram of the first fixed-rotation mechanism and the second fixed-rotation mechanism in the present invention.

[0024] Figure 6 For the present invention Figure 5 The enlarged image of point C in the middle.

[0025] Figure 7 It is a schematic diagram of the structural connection of the processing mechanism in the present invention,

[0026] Figure 8 For the present invention Figure 7 Enlarged view of point D in the middle.

[0027] In the figure: 1, workbench; 2, first fixed and rotating mechanism; 3, second fixed and rotating mechanism; 4, connecting bottom plate; 5, first tubular welding part; 6, second tubular welding part; 7, supporting side frame; 8, processing mechanism; 9, horizontal axis; 91, cross block; 92, crown gear; 93, second motor; 94, transmission gear; 31, fixed and rotating ring frame; 301, storage slot; 32, positioning frame; 33, driving ring; 34, U-shaped frame; 35, rotating shaft; 351, positioning wheel; 36, driven worm gear; 361, driving worm; 362, The first motor; 37, L-shaped connecting frame; 371, auxiliary wheel; 38, fixed bottom frame; 39, driven gear ring; 391, driving gear; 310, driving shaft; 311, cross slot; 81, processing top frame; 82, first linear electric cylinder; 83, L-shaped rear frame; 84, second linear electric cylinder; 85, buffer frame; 851, buffer slide; 852, guide shaft; 853, spring; 86, welding head; 87, first L-shaped frame; 871, distance rod; 872, ball bearing; 88, second L-shaped frame; 89, waste discharge cutter head. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: Figure 1-8As shown, the present invention provides a narrow gap submerged arc welding machine, including a workbench 1, a first fixing and rotating mechanism 2 is fixedly installed on one side of the top of the workbench 1, a second fixing and rotating mechanism 3 is fixedly installed on the other side of the top of the workbench 1, a connecting base plate 4 is provided between the first fixing and rotating mechanism 2 and the second fixing and rotating mechanism 3, a first tubular welding part 5 is detachably installed in the first fixing and rotating mechanism 2, a second tubular welding part 6 is detachably installed in the second fixing and rotating mechanism 3, a supporting side frame 7 is fixedly installed in the middle of the top of the workbench 1, and a processing mechanism 8 is fixedly installed on the supporting side frame 7.

[0030] The second fixed rotation mechanism 3 includes a fixed rotation ring frame 31, and a placement slot 301 is provided on the top of the fixed rotation ring frame 31 to facilitate the placement of the second tubular welding part 6 in the fixed rotation ring frame 31 through the placement slot 301. A cavity is provided in the fixed rotation ring frame 31, and a plurality of positioning frames 32 distributed in a circular array are provided on the inner side sliding card of the fixed rotation ring frame 31. The opposite ends of the plurality of positioning frames 32 extend into the cavity. A driving ring 33 is provided in the cavity. A plane thread protrusion is provided on one side of the driving ring 33. The plurality of positioning frames 32 are provided on the side close to the driving ring 33. There is a plane thread groove used in conjunction with the plane thread protrusion, the plane thread protrusion is movably clamped in the plane thread groove, and by driving the driving ring 33 to rotate, the plane thread protrusion is driven to rotate, thereby synchronously driving multiple positioning frames 32 to move toward each other, on the contrary, by driving the driving ring 33 to rotate in the opposite direction, the plane thread protrusion is driven to rotate in the opposite direction, thereby synchronously driving multiple positioning frames 32 to move in the opposite direction, and the opposite ends of the multiple positioning frames 32 are fixedly installed with U-shaped frames 34, and the U-shaped frames 34 are rotatably installed with rotating shafts 35, and the rotating shafts 35 are coaxially fixedly installed with positioning wheels 351;

[0031] L-shaped connecting frames 37 are vertically installed at the opposite ends of the multiple positioning frames 32, and auxiliary wheels 371 are rotatably installed at the ends of the L-shaped connecting frames 37. The second tubular welding piece 6 is movably clamped between the multiple positioning wheels 351 and the multiple auxiliary wheels 371. When in use, the second tubular welding piece 6 is placed in the fixed and rotating ring frame 31 through the storage groove 301, and the multiple positioning frames 32 move toward each other, driving the multiple L-shaped connecting frames 37 and the auxiliary wheels 371 to move toward each other, and synchronously driving the multiple U-shaped frames 34 and the positioning wheels 351 to move toward each other until the outer surface of the second tubular welding piece 6 contacts the multiple positioning wheels 351 and the auxiliary wheels 371, so as to perform rolling positioning on the second tubular welding piece 6, thereby improving the stability of the subsequent second tubular welding piece 6 during welding, and facilitating the subsequent rotation of the second tubular welding piece 6, performing rotary welding, and improving welding efficiency.

[0032] The second fixed and rotating mechanism 3 also includes a fixed bottom frame 38, which is fixedly installed on the bottom of the fixed and rotating ring frame 31, and the fixed bottom frame 38 is fixedly installed on the top of the workbench 1. The outer fixed sleeve of the driving ring 33 is provided with a driven gear ring 39, and a driving shaft 310 is rotatably installed in the fixed bottom frame 38. The outer fixed sleeve of the driving shaft 310 is provided with a driving gear 391 that is meshed and connected with the driven gear ring 39. When in use, the driving shaft 310 is controlled to rotate, driving the driving gear 391 to drive the driven gear ring 39 to rotate, thereby driving the driving ring 33 to rotate.

[0033] A driven worm gear 36 is coaxially fixedly installed at the end of one of the rotating shafts 35, and a driving worm 361 is meshingly connected to the bottom of the driven worm gear 36. The driving worm 361 is rotatably installed on the outer side of the corresponding U-shaped frame 34. A first motor 362 is fixedly installed on the outer side of the U-shaped frame 34. The driving end of the first motor 362 and the driving worm 361 are coaxially fixedly installed. When in use, the first motor 362 is controlled and turned on to drive the driving worm 361 to drive the driven worm gear 36 to rotate, thereby driving one of the rotating shafts 35 to rotate, and then driving the corresponding positioning wheel 351 to rotate, thereby driving the positioned second tubular weldment 6 to rotate.

[0034] The tops of the driving ring 33 and the driven gear ring 39 are also provided with placement slots 301 , so as to facilitate the second tubular welding member 6 to be placed in the fixed and rotating ring frame 31 through the placement slots 301 .

[0035] The first fixing and rotating mechanism 2 and the second fixing and rotating mechanism 3 have the same structure. The first tubular welding part 5 is movably clamped between a plurality of positioning wheels 351 and a plurality of auxiliary wheels 371 on the first fixing and rotating mechanism 2 to perform rolling positioning of the first tubular welding part 5 .

[0036] The connecting bottom plate 4 is fixedly mounted between the fixed bottom frames 38 on the first fixing and rotating mechanism 2 and the second fixing and rotating mechanism 3 .

[0037] A transverse axis 9 is provided between the driving shafts 310 in the first fixed rotation mechanism 2 and the second fixed rotation mechanism 3, and cross blocks 91 are fixedly installed at both ends of the transverse axis 9. Cross slots 311 corresponding to the cross blocks 91 are provided on the opposite sides of the driving shafts 310 in the first fixed rotation mechanism 2 and the second fixed rotation mechanism 3, and the cross blocks 91 are movably engaged in the corresponding cross slots 311. A crown gear 92 is fixedly sleeved on the outer side of the transverse axis 9, and a second motor 93 is fixedly installed on the side of the top of the workbench 1 close to the crown gear 92, and a transmission gear 94 meshingly connected to the crown gear 92 is fixedly installed on the driving end of the second motor 93. When in use, the second motor 93 is controlled and turned on to drive the transmission gear 94 to drive the crown gear 92 to rotate, thereby driving the transverse axis 9 to rotate stably, and then driving the driving shafts 310 and the driving gear 391 in the first fixed rotation mechanism 2 and the second fixed rotation mechanism 3 to rotate synchronously.

[0038] The processing mechanism 8 includes a processing top frame 81, which is fixedly installed on the top of the supporting side frame 7. A first linear electric cylinder 82 is fixedly installed on the bottom end of the processing top frame 81. An L-shaped rear frame 83 is fixedly installed on the driving end of the first linear electric cylinder 82. A second linear electric cylinder 84 is fixedly installed on the L-shaped rear frame 83. The first linear electric cylinder 82 and the second linear electric cylinder 84 are vertically arranged. A buffer frame 85 is fixedly installed on the driving end of the second linear electric cylinder 84. When in use, the first linear electric cylinder 82 is controlled and turned on to drive the L-shaped rear frame 83, the second linear electric cylinder 84 and the buffer frame 85 to move horizontally, and the second linear electric cylinder 84 is controlled and turned on to drive The buffer frame 85 is movable to move vertically, a buffer slide 851 is slidably provided on one side of the buffer frame 85, a guide shaft 852 is fixedly provided in the buffer frame 85, the buffer slide 851 is slidably sleeved on the outside of the guide shaft 852, springs 853 are provided on the outside of the guide shaft 852 at the top and bottom ends of the buffer slide 851, a welding head 86 is fixedly provided on the end of the buffer slide 851, a first L-shaped frame 87 is fixedly installed on the side end of the buffer slide 851, a distance rod 871 is fixedly installed on the end of the first L-shaped frame 87 by bolts, a ball 872 is provided on the bottom rolling card of the distance rod 871, and the side end of the buffer frame 85 A second L-shaped frame 88 is fixedly installed, and a waste discharge cutter head 89 is fixedly installed at the end of the second L-shaped frame 88 by bolts. When in use, the second linear electric cylinder 84 is controlled to start, and the position of the bottom of the distance rod 871 is adjusted to make the ball 872 contact with the outer wall of the second tubular welding part 6, and the first linear electric cylinder 82 is controlled and started to place the welding head 86 at the welding point between the first tubular welding part 5 and the second tubular welding part 6, and the distance between the head position of the welding head 86 and the welding point between the first tubular welding part 5 and the second tubular welding part 6 is adjusted. Subsequently, the rotating first tubular welding part 5 and the second tubular welding part 6 are rotationally welded and fixed. When the first tubular welding part 5 and the second tubular welding part 6 are rotated and welded to be fixed, the ball 872 rolls on the outer wall of the second tubular welding part 6, so as to improve the welding stability, efficiency and effect between the tubular welding parts. After welding, there will be waste at the welding point. At this time, the first linear electric cylinder 82 is turned on to translate the waste discharge cutter head 89 so that the waste discharge cutter head 89 and the welding point are vertically corresponding. The second linear electric cylinder 84 is turned on to lower the waste discharge cutter head 89 so that the waste discharge cutter head 89 is placed at the welding point. In conjunction with the rotation of the first tubular welding part 5 and the second tubular welding part 6 after welding is completed, the waste discharge cutter head 89 automatically cleans the waste at the welding point by rolling, thereby effectively improving the welding effect between the tubular welding parts.

[0039] Working principle: When welding, the first tubular welding piece 5 and the second tubular welding piece 6 are placed in the fixed rotating ring frame 31 of the first fixed rotating mechanism 2 and the second fixed rotating mechanism 3 through the corresponding object placement slots 301;

[0040] Subsequently, the second motor 93 is controlled and turned on to drive the transmission gear 94 to drive the crown gear 92 to rotate, thereby driving the horizontal shaft 9 to rotate stably, and then driving the driving shaft 310 and the driving gear 391 in the first fixed rotation mechanism 2 and the second fixed rotation mechanism 3 to rotate synchronously, driving the corresponding driven gear ring 39 to rotate, thereby driving the corresponding driving ring 33 to rotate, driving the plane thread convex to rotate, thereby synchronously driving the multiple positioning frames 32 to move toward each other, driving the multiple L-shaped connecting frames 37 and the auxiliary wheels 371 to move toward each other, and synchronously driving the multiple U-shaped frames 34 and the positioning wheels 351 to move toward each other, until the outer surfaces of the first tubular welding member 5 and the second tubular welding member 6 are in contact with the corresponding multiple positioning wheels 351 and the auxiliary wheels 371, and the first tubular welding member 5 and the second tubular welding member 6 are rollingly positioned, and a weld is left between the first tubular welding member 5 and the second tubular welding member 6;

[0041] Subsequently, the second linear electric cylinder 84 is controlled to be turned on, and the position of the bottom of the distance rod 871 is adjusted so that the ball 872 contacts the outer wall of the second tubular welding member 6, and the first linear electric cylinder 82 is controlled and turned on so that the welding head 86 is placed at the welding point between the first tubular welding member 5 and the second tubular welding member 6, and the distance between the head position of the welding head 86 and the welding point between the first tubular welding member 5 and the second tubular welding member 6 is adjusted;

[0042] Subsequently, the first motor 362 on the first fixed rotating mechanism 2 and the second fixed rotating mechanism 3 is controlled and turned on, driving the corresponding driving worm 361 to drive the driven worm gear 36 to rotate, thereby driving one of the corresponding rotating shafts 35 to rotate, and then driving the corresponding positioning wheel 351 to rotate, thereby driving the positioned first tubular welding part 5 and the second tubular welding part 6 to rotate, and the first tubular welding part 5 and the second tubular welding part 6 are rotationally welded and fixed. When the first tubular welding part 5 and the second tubular welding part 6 are rotationally welded and fixed, the ball 872 rolls on the outer wall of the second tubular welding part 6, thereby improving the welding stability, efficiency and effect between the tubular welding parts;

[0043] After welding is completed, there will be waste at the welding place. At this time, the first linear electric cylinder 82 is turned on to translate the waste discharge cutter head 89 so that the waste discharge cutter head 89 and the welding place are vertically corresponding. The second linear electric cylinder 84 is turned on to lower the waste discharge cutter head 89 so that the waste discharge cutter head 89 is placed at the welding place. In conjunction with the rotation of the first tubular welding part 5 and the second tubular welding part 6 after welding is completed, the waste discharge cutter head 89 automatically cleans the waste at the welding place in a rolling manner, thereby effectively improving the welding effect between the tubular welding parts.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A narrow gap submerged arc welding machine, comprising a workbench (1), characterized in that: A first fixed rotation mechanism (2) is fixedly mounted on one side of the top of the workbench (1), and a second fixed rotation mechanism (3) is fixedly mounted on the other side of the top of the workbench (1); a connecting base plate (4) is provided between the first fixed rotation mechanism (2) and the second fixed rotation mechanism (3); a first tubular welding part (5) is detachably mounted in the first fixed rotation mechanism (2), and a second tubular welding part (6) is detachably mounted in the second fixed rotation mechanism (3); a supporting side frame (7) is fixedly mounted in the middle of the top of the workbench (1), and a processing mechanism (8) is fixedly mounted on the supporting side frame (7); The second fixed rotation mechanism (3) comprises a fixed rotation ring frame (31), a top of the fixed rotation ring frame (31) is provided with a placement slot (301), a cavity is provided in the fixed rotation ring frame (31), a plurality of positioning frames (32) distributed in a ring array are slidably clamped on the inner side of the fixed rotation ring frame (31), the opposite ends of the plurality of positioning frames (32) all extend into the cavity, a driving ring (33) is rotatably clamped in the cavity, a plane thread protrusion is provided on one side of the driving ring (33), a plane thread groove used in conjunction with the plane thread protrusion is provided on one side of the plurality of positioning frames (32) close to the driving ring (33), the plane thread protrusion is movably clamped in the plane thread groove, a U-shaped frame (34) is fixedly mounted on the opposite ends of the plurality of positioning frames (32), a rotating shaft (35) is rotatably mounted on the U-shaped frame (34), and a positioning wheel (351) is coaxially fixedly mounted on the rotating shaft (35); The second fixed-rotation mechanism (3) further comprises a fixed bottom frame (38), the fixed bottom frame (38) being fixedly mounted on the bottom of the fixed-rotation ring frame (31), the fixed bottom frame (38) being fixedly mounted on the top of the workbench (1), the outer fixed sleeve of the drive ring (33) being provided with a driven gear ring (39), a drive shaft (310) being rotatably mounted in the fixed bottom frame (38), and the outer fixed sleeve of the drive shaft (310) being provided with a drive gear (391) meshingly connected with the driven gear ring (39); L-shaped connecting frames (37) are vertically mounted at opposite ends of the plurality of positioning frames (32), auxiliary wheels (371) are rotatably mounted at the ends of the L-shaped connecting frames (37), and the second tubular welding member (6) is movably clamped between the plurality of positioning wheels (351) and the plurality of auxiliary wheels (371); The first fixed and rotating mechanism (2) and the second fixed and rotating mechanism (3) have the same structure, and the first tubular welding piece (5) is movably clamped between a plurality of positioning wheels (351) and a plurality of auxiliary wheels (371) on the first fixed and rotating mechanism (2); A transverse shaft (9) is provided between the driving shafts (310) in the first fixed-rotation mechanism (2) and the second fixed-rotation mechanism (3); cross clamping blocks (91) are fixedly mounted on both ends of the transverse shaft (9); cross clamping grooves (311) corresponding to the cross clamping blocks (91) are provided on opposite sides of the driving shafts (310) in the first fixed-rotation mechanism (2) and the second fixed-rotation mechanism (3); the cross clamping blocks (91) are movably engaged in the corresponding cross clamping grooves (311); a crown gear (92) is fixedly sleeved on the outer side of the transverse shaft (9); a second motor (93) is fixedly mounted on a side of the top end of the workbench (1) close to the crown gear (92); and a transmission gear (94) meshingly connected to the crown gear (92) is fixedly mounted on the driving end of the second motor (93).

2. A narrow gap submerged arc welding machine according to claim 1, characterized in that: A driven worm wheel (36) is coaxially fixedly mounted on the end of one of the rotating shafts (35); a driving worm (361) is meshingly connected to the bottom of the driven worm wheel (36); the driving worm (361) is rotatably mounted on the outside of a corresponding U-shaped frame (34); a first motor (362) is fixedly mounted on the outside of the U-shaped frame (34); and a driving end of the first motor (362) and the driving worm (361) are coaxially fixedly mounted.

3. A narrow gap submerged arc welding machine according to claim 1, characterized in that: The tops of the driving ring (33) and the driven gear ring (39) are also provided with object placement slots (301).

4. A narrow gap submerged arc welding machine according to claim 1, characterized in that: The connecting bottom plate (4) is fixedly mounted between the fixed bottom frames (38) on the first fixed rotation mechanism (2) and the second fixed rotation mechanism (3).

5. A narrow gap submerged arc welding machine according to claim 1, characterized in that: The processing mechanism (8) comprises a processing top frame (81), the processing top frame (81) is fixedly mounted on the top of the supporting side frame (7), a first linear electric cylinder (82) is fixedly mounted on the bottom end of the processing top frame (81), an L-shaped rear frame (83) is fixedly mounted on the driving end of the first linear electric cylinder (82), a second linear electric cylinder (84) is fixedly mounted on the L-shaped rear frame (83), a buffer frame (85) is fixedly mounted on the driving end of the second linear electric cylinder (84), a buffer slide (851) is slidably mounted on one side of the buffer frame (85), a guide shaft (852) is fixedly mounted in the buffer frame (85), and the buffer slide (851) slides Sleeved on the outside of the guide shaft (852), springs (853) are provided on the outside of the guide shaft (852) at the top and bottom ends of the buffer slide (851), a welding head (86) is fixedly provided on the end of the buffer slide (851), a first L-shaped frame (87) is fixedly installed on the side end of the buffer slide (851), a distance rod (871) is fixedly installed on the end of the first L-shaped frame (87) by bolts, a ball bearing (872) is provided on the bottom rolling card of the distance rod (871), a second L-shaped frame (88) is fixedly installed on the side end of the buffer frame (85), and a waste discharge cutter head (89) is fixedly installed on the end of the second L-shaped frame (88) by bolts.

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