Double-sided submerged arc welding spiral steel pipe forming equipment

Abstract

The invention relates to the technical field of spiral steel pipe forming, and discloses double-sided submerged arc welding spiral steel pipe forming equipment which comprises a base, a forming pipe is installed at the upper end of the base, a material opening is formed in the front side of the forming pipe, and a feeding mechanism which is installed on the base and used for obliquely feeding a steel belt into the material opening is fixedly connected to the front end of the forming pipe. Row rollers are installed on the side wall of the forming pipe, a spiral outer welding cover is fixedly connected to the outer wall of the forming pipe in a clamped mode, an outer welding head is installed at the top of the outer welding cover, and an F-shaped suction pipe is fixedly connected to the bottom of the outer welding cover. When steel belt spiral output and inside and outside submerged arc welding are carried out, the inner brush roller and the outer brush roller automatically grind and clean welding slag, the edges of the right ends of the inner welding cover and the outer welding cover are further matched for scraping and cleaning, the welding slag and overflowing welding flux are sucked and collected by negative pressure in the inner welding cover and the outer welding cover, and the welding slag is released through vibration and cooling of the slag collecting assembly. And therefore, the cleaning and collecting effect on the welding slag and the welding flux and the collecting safety and reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spiral steel pipe forming, in particular to a double-sided submerged arc welding spiral steel pipe forming equipment. BACKGROUND

[0002] The spiral steel pipe is a spiral seam steel pipe formed by warm extrusion of a strip steel coil and welded by automatic double-wire double-sided submerged arc welding technology. The advanced double-sided submerged arc welding technology can realize welding at the optimal position and is not prone to defects such as misalignment, welding deviation and incomplete penetration, thus having high welding quality. The double-sided submerged arc welding technology uses a continuously fed welding wire as an electrode to ignite an arc under the "burial" of a granular flux layer. The arc heat melts the welding wire, base material and part of the flux to form a molten pool and molten slag, and finally cools and solidifies into a weld.

[0003] The patent for invention with publication number CN119237888A discloses a double-sided submerged arc welding spiral steel pipe forming device. A long rod is arranged at the center of a rotating assembly, a carrier is installed at the end of the long rod away from the rotating assembly, and four grooves are evenly arranged on the outer wall of the carrier. The long strip iron moves along the inclined direction of the forming wheel when moving inside the pipe body. The inclined direction of the forming wheel spirally guides the long strip iron to form a spiral pipe. The welding gun welds the spiral gap on the spiral pipe when the spiral pipe passes through the welding gun. The generated slag falls into the grooves and is collected during the welding process, thereby solving the problem of cleaning the slag on the inner wall of the spiral pipe after the spiral pipe is formed.

[0004] In the use of the double-sided submerged arc welding spiral steel pipe forming device in the above patent, the reciprocating movement of the brush ring is used to clean the slag on the outer wall of the spiral steel pipe. Since the slag still has welding residual heat, the brush ring is easily damaged. The adhered slag on the surface of the spiral steel pipe is relatively firm and is difficult to clean reliably using the brush ring. In actual welding, there are also problems of spattering of slag and overflow of flux, thereby reducing the cleaning and collection effect. When the grooves are used to collect the slag falling from the weld, the slag is generally in a molten state. The molten slag is easily adhered to the inner wall of the groove after solidification, which makes it inconvenient to pour and discharge subsequently. SUMMARY

[0005] The present application aims to solve the problems of poor cleaning and collection effect and poor treatment of molten slag in the use of general double-sided submerged arc welding spiral steel pipe forming devices. The present application provides a double-sided submerged arc welding spiral steel pipe forming equipment.

[0006] To achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions: The utility model provides a double -sided submerged arc welding spiral steel pipe forming equipment, including the base, the base upper end is equipped with the forming pipe, the forming pipe front side is equipped with the material mouth, the forming pipe front end is fixedly connected with the installation in the base is used for the oblique feeding of steel band material mouth, the forming pipe side wall is equipped with the row of roller, the forming pipe outer wall is fixedly connected with the spiral outer welding cover, the outer welding cover top is equipped with the outer welding head, the outer welding cover bottom is fixedly connected with F type suction pipe, the outer welding cover inner chamber middle part is equipped with a plurality of outer brush roller, the forming pipe outer wall has the spiral weld groove with the outer welding cover, The base left side is fixedly inserted with the suction branch pipe extending into the forming pipe, the suction branch pipe is fixedly connected with the spiral inner welding cover, the inner welding cover lower wall is installed with the inner welding head, the inner welding cover inner chamber is provided with a plurality of inner brush rollers on one side close to the right end, the inner welding cover inner chamber is provided with a slag collecting assembly for driving slag vibration and cooling release on one side close to the left end.

[0007] Further, the number of row rollers is two, and each is installed on the rear wall and the upper wall of the forming pipe. The upper row roller is right of the rear row roller. The row rollers have a plurality of guide rollers with shafts parallel to the shaft of the forming pipe.

[0008] Further, the left end of the inner welding cover is aligned with the left end of the outer welding cover inside and outside, and the left end of the outer welding cover is downward. The outer welding cover and the inner welding cover have gaps with the side wall of the spiral steel pipe. The outer welding cover has one spiral. The inner welding cover has one and a half spirals.

[0009] Further, the right end of the outer welding cover is fixedly connected with an outer scraper. The right end of the inner welding cover is fixedly connected with an inner scraper. The inner scraper and the outer scraper can abut the side wall of the spiral steel pipe. The inner scraper and the outer scraper have corresponding inclined edges close to the spiral steel pipe.

[0010] Further, the outer welding cover has a plurality of outer shaft rollers rotatably connected from top to bottom in the middle part. The outer brush rollers are fixedly sleeved on the outer shaft rollers. The inner welding cover has a plurality of inner shaft rollers rotatably connected from top to bottom in the front side. The inner brush rollers are fixedly sleeved on the inner shaft rollers. The inner shaft rollers and the outer shaft rollers have gradually increasing radii from top to bottom.

[0011] Further, the left end of the forming pipe has a shaft support. The inner shaft rollers and the outer shaft rollers are rotatably installed on the shaft support. A driving shaft is rotatably connected to the shaft support. The driving shaft is driven by a motor installed on the right end of the shaft support. A transmission belt is movably sleeved between the left end of the inner shaft rollers and the outer shaft rollers and the left end of the driving shaft.

[0012] Further, the F type suction pipe is in communication with the left end and the bottom of the outer welding cover. The rear end of the F type suction pipe is externally connected to a negative pressure suction mechanism.

[0013] Further, the slag collecting assembly comprises a plurality of top columns arranged on the inner wall of the left end of the inner welding cover, a sliding frame is slidably connected to the left inner wall of the inner welding cover and is sleeved with the top columns, the front wall of the sliding frame is inclined backward, the front end of the sliding frame is fixedly connected with an L-shaped elastic plate which is elastically connected with the inner wall of the inner welding cover, and a cam is movably connected with the L-shaped elastic plate and is fixedly sleeved on the inner shaft roller.

[0014] Further, the right end of the inner welding cover is communicated with the right end of the suction branch pipe, a negative pressure suction mechanism is arranged on the left end of the suction branch pipe, and the slag collecting assembly further comprises a T-shaped branch pipe fixedly connected between the left end of the inner welding cover and the rear wall of the suction branch pipe, a through hole corresponding to the T-shaped branch pipe is formed in the left wall of the sliding frame, and a telescopic cylinder is fixedly connected between the left end of the T-shaped branch pipe and the suction branch pipe, the right telescopic end of the telescopic cylinder is slidably and sealingly connected with the inner wall of the T-shaped branch pipe, and the inner wall of the inner welding cover is aligned with the telescopic cylinder.

[0015] Further, the slag collecting assembly further comprises a heat dissipation air duct fixedly connected to the left wall of the inner welding cover, the left wall of the heat dissipation air duct is fixedly connected with an air pipe sleeved on the inner shaft roller, the front end of the air pipe is sealed and the rear end is open, a fan is installed on the inner shaft roller and located in the air pipe, the inner welding cover, the outer welding cover and the sliding frame are made of aluminum alloy or stainless steel, and the outer walls of the inner welding cover and the outer welding cover are provided with heat dissipation micropores.

[0016] The beneficial effects of the present application are as follows: 1. The steel strip is fed into the forming pipe through the feeding mechanism, and the outer and inner welding heads are sequentially welded to the spiral steel pipe when the steel strip is guided and output to the right by the discharge roller, the welding slag inside and outside the welded area of the spiral steel pipe is ground and cleaned by the inner and outer brush rollers after welding, and the residual welding slag is scraped and cleaned after the surface of the spiral steel pipe is ground and cleaned by the right end edge of the inner and outer welding covers, the cleaned welding slag and the overflowed flux are collected in the corresponding low points of the inner and outer welding covers, and are sucked out by the F-shaped suction pipe and the suction branch pipe, thereby improving the cleaning and collection effect of the welding slag and the flux and reducing the subsequent cleaning burden.

[0017] 2. The slag collecting assembly vibrates to collect the welding slag falling during the welding of the outer welding head, thereby avoiding the solidification of the molten welding slag in the slag collecting assembly, cooling and releasing the welding slag during the slag collecting process, and thereby improving the safety and reliability of the welding slag collection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the three-dimensional structure of the forming equipment of the present application Figure One ; Figure 2 is the three-dimensional structure of the forming equipment of the present application Figure Two ; Figure 3This is a three-dimensional structural diagram of the forming tube and feeding mechanism of the forming equipment of the present invention; Figure 4 This is a three-dimensional structural diagram of the outer welding cover and F-type suction pipe of the molding equipment of the present invention; Figure 5 This is a three-dimensional structural diagram of the outer welding cover and outer brush roller of the molding equipment of the present invention; Figure 6 This is a three-dimensional structural diagram of the suction branch pipe and inner welding cover of the molding equipment of the present invention; Figure 7 This is a three-dimensional structural diagram of the inner welding cover and inner brush roller of the molding equipment of the present invention; Figure 8 This is a three-dimensional structural diagram of the sliding frame and telescopic cylinder of the molding equipment of the present invention; Figure 9 This is a three-dimensional structural diagram of the outer and inner welding covers of the molding equipment of the present invention; Figure 10 This is a three-dimensional structural diagram of the forming tube and roller section of the forming equipment of the present invention.

[0019] Reference numerals: 1. Base; 2. Forming tube; 21. Roller; 22. Feeding mechanism; 23. Drive shaft; 3. Outer weld cover; 31. Outer weld head; 32. Outer scraper; 33. F-type suction pipe; 34. Outer shaft roller; 35. Outer brush roller; 4. Suction branch pipe; 41. Inner weld cover; 42. Inner weld head; 43. Inner scraper; 44. Inner shaft roller; 45. Inner brush roller; 46. Cam; 47. Fan; 5. Top column; 51. Sliding frame; 52. L-shaped elastic plate; 53. T-shaped branch pipe; 54. Telescopic cylinder; 55. Heat dissipation duct; 56. Air duct. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] Example 1, as Figures 1-10 As shown, a double-sided submerged arc welding spiral steel pipe forming equipment includes a base 1, a forming pipe 2 installed on the upper end of the base 1, a material port opened on the front side of the forming pipe 2, a feeding mechanism 22 installed on the base 1 for obliquely feeding steel strip into the material port fixedly connected to the front end of the forming pipe 2, a roller 21 installed on the side wall of the forming pipe 2, a spiral outer welding cover 3 fixedly clamped to the outer wall of the forming pipe 2, an outer welding head 31 installed on the top of the outer welding cover 3, an F-type suction pipe 33 fixedly connected to the bottom of the outer welding cover 3, a plurality of outer brush rollers 35 arranged in the middle of the inner cavity of the outer welding cover 3, and a spiral welding groove corresponding to the outer welding cover 3 on the outer wall of the forming pipe 2. The base 1 is fixedly connected with the suction branch pipe 4 extending into the forming pipe 2 on the left side, and the inner welding cover 41 in a spiral shape is fixedly connected on the suction branch pipe 4, the inner welding head 42 is installed on the lower wall of the inner welding cover 41, a plurality of inner brush rollers 45 are arranged on the side close to the right end in the inner cavity of the inner welding cover 41, and the slag collecting assembly for vibrating and cooling the slag and releasing the slag is arranged on the side close to the left end in the inner cavity of the inner welding cover 41.

[0022] The number of the discharge rollers 21 is two, and the discharge rollers 21 are installed on the rear wall and the upper wall of the forming pipe 2, respectively. The upper discharge roller 21 is right to the rear discharge roller 21, and the shafts of the guide rollers in the discharge rollers 21 are parallel to the shaft of the forming pipe 2.

[0023] In use, the outer welding head 31 and the inner welding head 42 are provided with the existing technology of the flux releasing and flux negative pressure suction and recovery functions. The steel belt is sent into the forming pipe 2 by the inclined feeding mechanism 22, and the left and right two discharge rollers 21 on the rear wall and the upper wall of the forming pipe 2 guide the steel belt by the shafts of the guide rollers parallel to the shaft of the forming pipe 2. The steel belt is automatically wound to form a spiral steel pipe and output to the right. The outer welding head 31 and the inner welding head 42 are sequentially welded on the outer and inner walls of the spiral steel pipe. The inner brush roller 45 and the outer brush roller 35 grind and clean the slag in the welded area of the spiral steel pipe after welding. The residual slag is scraped and cleaned after the right end edges of the outer welding cover 3 and the inner welding cover 41 grind and clean the surface of the spiral steel pipe. The slag falling during the welding of the outer welding head 31 is collected by the slag collecting assembly. Since the slag and the overflowed flux are collected in the inner cavities of the outer welding cover 3 and the inner welding cover 41, and are gathered in the corresponding low points of the spiral area of the outer welding cover 3 and the inner welding cover 41, the slag and the overflowed flux can be suction cleaned by the suction of the F-shaped suction pipe 33 and the suction branch pipe 4, thereby improving the cleaning and collecting effect of the slag and the flux, avoiding the problems of splashing of the slag and overflow of the flux, and reducing the subsequent cleaning burden. Since the slag collecting assembly is used for vibrating and collecting the slag, the molten slag is prevented from solidifying in the inner cavity of the slag collecting assembly. The slag is cooled and cooled during the slag collecting process, and is released after cooling, thereby improving the safety and reliability of the slag collecting.

[0024] In the embodiment two, the left end of the inner welding cover 41 is aligned with the left end of the outer welding cover 3, and the left end of the outer welding cover 3 faces downward. The outer welding cover 3 and the inner welding cover 41 have gaps with the side wall of the spiral steel pipe. The outer welding cover 3 has one turn, and the inner welding cover 41 has one and a half turns.

[0025] The F-shaped suction pipe 33 is in communication with the left end and the bottom of the outer welding cover 3, and the rear end of the F-shaped suction pipe 33 is externally connected with a negative pressure suction mechanism.

[0026] The right end of the inner welding cover 41 is in communication with the right end of the suction branch pipe 4, and the left end of the suction branch pipe 4 is externally connected with a negative pressure suction mechanism.

[0027] The gap between the outer welding cover 3, the inner welding cover 41 and the side wall of the spiral steel pipe avoids mutual abrasion with the spiral steel pipe; when the welding flux released by the outer welding head 31 overflows forward or backward, and when welding slag is generated due to welding by the outer welding head 31 and grinding by the outer brush roller 35, the welding flux and the welding slag automatically fall into the rear side and the bottom of the inner cavity of the outer welding cover 3 under the action of gravity, and are then sucked away by the F-shaped suction pipe 33; when welding slag is generated due to grinding by the inner brush roller 45, the welding slag automatically falls into the front part of the inner cavity of the right side of the inner welding cover 41 under the action of gravity, and is then sucked away by the suction branch pipe 4; for a small amount of welding flux or welding slag accidentally falling into the middle part of the inner cavity of the inner welding cover 41, the welding flux or the welding slag can be discharged by the negative pressure suction recovery function of the inner welding head 42.

[0028] In example three, on the basis of the above examples, the outer scraping plate 32 is fixedly connected to the right end of the outer welding cover 3, and the inner scraping plate 43 is fixedly connected to the right end of the inner welding cover 41; the inner scraping plate 43 and the outer scraping plate 32 can abut against the side wall of the spiral steel pipe; and the inner scraping plate 43 and the outer scraping plate 32 are provided with corresponding inclined edges close to the end of the spiral steel pipe.

[0029] After the welding slag in the inner and outer welding seam areas of the spiral steel pipe is ground and cleaned by the outer brush roller 35 and the inner brush roller 45 during welding, the outer scraping plate 32 and the inner scraping plate 43 automatically grind and clean the residual welding slag on the surface of the spiral steel pipe by using the corresponding edges, thereby improving the cleaning effect.

[0030] In example four, on the basis of the above examples, a plurality of outer shaft rollers 34 are rotatably connected to the middle part of the outer welding cover 3 from top to bottom, and the outer brush roller 35 is fixedly sleeved on the outer shaft roller 34; a plurality of inner shaft rollers 44 are rotatably connected to the front side of the inner welding cover 41 from top to bottom, and the inner brush roller 45 is fixedly sleeved on the inner shaft roller 44; and the radius of the inner shaft roller 44 and the outer shaft roller 34 gradually increases from top to bottom.

[0031] When the spiral steel pipe is conveyed to the right, the welding seam on the spiral steel pipe passes through the inner brush roller 45 and the outer brush roller 35 with gradually increasing radii, thereby dispersing the grinding force and effectively avoiding excessive stress on the welding slag in single grinding, so as to improve the falling-off effect.

[0032] In example five, on the basis of the above examples, the forming pipe 2 is provided with a shaft support at the left end, the inner shaft roller 44 and the outer shaft roller 34 are rotatably installed on the shaft support, a driving shaft 23 is rotatably connected to the shaft support, the driving shaft 23 is driven by a motor installed at the right end of the shaft support, and a transmission belt is movably sleeved between the left end of the inner shaft roller 44 and the outer shaft roller 34 and the left end of the driving shaft 23.

[0033] The motor drives the driving shaft 23 to rotate, and the transmission belt synchronously drives each inner shaft roller 44 and outer shaft roller 34 to grind the welding slag by the inner brush roller 45 and the outer brush roller 35, so that the control is convenient and reliable.

[0034] In the above embodiment, the slag collecting assembly further comprises a plurality of top columns 5 arranged on the inner wall of the left end of the inner welding cover 41, a sliding frame 51 is slidingly connected to the inner wall of the left side of the inner welding cover 41, the front wall of the sliding frame 51 is inclined backward, an L-shaped elastic plate 52 is fixedly connected to the front end of the sliding frame 51 and is elastically connected to the inner wall of the inner welding cover 41, and a cam 46 is fixedly sleeved on the top inner shaft roller 44 and is in movable abutment with the L-shaped elastic plate 52.

[0035] The L-shaped elastic plate 52 is pulled to move upward relative to the sliding frame 51 by the cam 46 driven by the rotation of the inner shaft roller 44, and the sliding frame 51 is reset by the L-shaped elastic plate 52 after the cam 46 passes the L-shaped elastic plate 52. With the continuous rotation of the cam 46, the sliding frame 51 is continuously vibrated and moves on the top column 5. When the outer welding head 31 welds the joint of the outer wall of the spiral steel pipe, the molten welding slag falls into the sliding frame 51 and slides to the bottom along the sliding frame 51, thereby avoiding the adhesion of the welding slag and affecting the subsequent discharge.

[0036] In the above embodiment, the slag collecting assembly further comprises a T-shaped branch pipe 53 fixedly connected between the left end of the inner welding cover 41 and the rear wall of the suction branch pipe 4, a through hole corresponding to the T-shaped branch pipe 53 is formed in the left wall of the sliding frame 51, and a telescopic cylinder 54 is fixedly connected between the left end of the T-shaped branch pipe 53 and the suction branch pipe 4.

[0037] The slag collecting assembly further comprises a heat dissipation air duct 55 fixedly connected to the left wall of the inner welding cover 41, and an air pipe 56 sleeved on the top inner shaft roller 44 is fixedly connected to the left wall of the heat dissipation air duct 55. The front end of the air pipe 56 is sealed and the rear end is open, a fan 47 is installed on the top inner shaft roller 44 and is in the air pipe 56, the inner welding cover 41 and the outer welding cover 3 and the sliding frame 51 are made of aluminum alloy or stainless steel, and heat dissipation micro-holes are formed in the outer walls of the inner welding cover 41 and the outer welding cover 3.

[0038] The initial T-shaped branch pipe 53 is in a closed state, thereby avoiding the molten welding slag being directly sucked away. With the continuous vibration of the sliding frame 51 and the air being blown into the heat dissipation air duct 55 by the fan 47 through the air pipe 56 driven by the inner shaft roller 44, the air cools the inner welding cover 41 and the sliding frame 51, thereby accelerating the cooling of the molten welding slag. Correspondingly, the inner welding cover 41 and the outer welding cover 3 are made of aluminum alloy or stainless steel and have heat dissipation micro-holes, thereby avoiding the accumulation of welding heat and affecting the quality of the spiral steel pipe welding forming. Subsequently, after the welding is completed, the telescopic cylinder 54 is controlled to contract to make the T-shaped branch pipe 53 inside a passage, and the cooled and solidified welding slag can be sucked away and cleaned by the suction branch pipe 4.

[0039] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-sided submerged arc welding spiral steel pipe forming equipment, comprising a base (1), characterized in that, The upper end of the base (1) is equipped with a forming tube (2), the front side of the forming tube (2) is provided with a material port, the front end of the forming tube (2) is fixedly connected to a feeding mechanism (22) installed on the base (1) for obliquely feeding the steel strip into the material port, the side wall of the forming tube (2) is equipped with a roller (21), the outer wall of the forming tube (2) is fixedly clamped with a spiral outer welding cover (3), the top of the outer welding cover (3) is equipped with an outer welding head (31), the bottom of the outer welding cover (3) is fixedly connected with an F-type suction tube (33), the inner cavity of the outer welding cover (3) is provided with several outer brush rollers (35), the outer wall of the forming tube (2) has a spiral welding groove corresponding to the outer welding cover (3); The base (1) is fixedly inserted with a suction branch pipe (4) extending into the forming tube (2) on the left side. A spiral inner welding cover (41) is fixedly connected to the suction branch pipe (4). An inner welding head (42) is installed on the lower wall of the inner welding cover (41). Several inner brush rollers (45) are provided on the right side of the inner cavity of the inner welding cover (41). A slag collection assembly that drives the welding slag to vibrate and cool and release is provided on the left side of the inner cavity of the inner welding cover (41).

2. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 1, characterized in that, There are two rollers (21), which are installed on the rear wall and the upper wall of the forming tube (2) respectively. The upper roller (21) is to the right of the rear roller (21). The roller (21) has several guide rollers whose axis is parallel to the axis of the forming tube (2).

3. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 2, characterized in that, The left end of the inner welding cover (41) is aligned with the left end of the outer welding cover (3), and the left end of the outer welding cover (3) faces downward. There is a gap between the outer welding cover (3) and the inner welding cover (41) and the side wall of the spiral steel pipe. The outer welding cover (3) has one spiral turn, and the inner welding cover (41) has one and a half spiral turns.

4. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 3, characterized in that, The outer welding cover (3) is fixedly connected to the right end of the outer scraper (32), and the inner welding cover (41) is fixedly connected to the right end of the inner scraper (43). Both the inner scraper (43) and the outer scraper (32) can move and abut against the side wall of the spiral steel pipe. Both the inner scraper (43) and the outer scraper (32) have corresponding inclined blades at the end near the spiral steel pipe.

5. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 4, characterized in that, The outer welding cover (3) has several outer shaft rollers (34) rotatably connected from top to bottom in the middle. The outer brush roller (35) is fixedly sleeved on the outer shaft roller (34). The inner welding cover (41) has several inner shaft rollers (44) rotatably connected from top to bottom on the front side. The inner brush roller (45) is fixedly sleeved on the inner shaft roller (44). The radii of the inner shaft roller (44) and the outer shaft roller (34) gradually increase from top to bottom.

6. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 5, characterized in that, The forming tube (2) has a shaft frame at the left end. The inner shaft roller (44) and the outer shaft roller (34) are rotatably mounted on the shaft frame. A drive shaft (23) is rotatably connected to the shaft frame. The drive shaft (23) is driven by a motor mounted on the right end of the shaft frame. A transmission belt is movably sleeved between the left end of the inner shaft roller (44) and the outer shaft roller (34) and the left end of the drive shaft (23).

7. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 6, characterized in that, The F-type suction tube (33) is connected to the left end and bottom of the outer welding cover (3) respectively, and the rear end of the F-type suction tube (33) is connected to a negative pressure suction mechanism.

8. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 7, characterized in that, The slag collection assembly includes several top columns (5) set on the inner wall of the left end enclosure of the inner welding cover (41). The inner wall of the left side of the inner welding cover (41) is slidably engaged with a sliding frame (51) that is slidably sleeved with the top columns (5). The bottom of the front wall of the sliding frame (51) is tilted backward. The front end of the sliding frame (51) is fixedly connected with an L-shaped elastic plate (52) that is elastically connected to the inner wall of the inner welding cover (41). The top inner shaft roller (44) is fixedly sleeved with a cam (46) that movably abuts against the L-shaped elastic plate (52).

9. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 8, characterized in that, The right end of the inner welding cover (41) is connected to the right end of the suction branch pipe (4). The left end of the suction branch pipe (4) is connected to a negative pressure suction mechanism. The slag collection assembly also includes a T-shaped branch pipe (53) fixedly connected between the left end of the inner welding cover (41) and the rear wall of the suction branch pipe (4). The left wall of the sliding frame (51) is provided with a through hole corresponding to the T-shaped branch pipe (53). A telescopic cylinder (54) is fixedly connected between the left end of the T-shaped branch pipe (53) and the suction branch pipe (4). The right telescopic end of the telescopic cylinder (54) is slidably and sealed to the inner wall of the T-shaped branch pipe (53) and aligned with the inner wall of the inner welding cover (41).

10. A double-sided submerged arc welding spiral steel pipe forming equipment according to claim 9, characterized in that, The slag collection assembly also includes a heat dissipation duct (55) fixedly connected to the left wall of the inner welding cover (41). The left wall of the heat dissipation duct (55) is fixedly connected to a duct (56) sleeved on the top inner shaft roller (44). The front end of the duct (56) is sealed and the rear end is open. A fan (47) in the duct (56) is installed on the top inner shaft roller (44). The inner welding cover (41), the outer welding cover (3), and the sliding frame (51) are all made of aluminum alloy or stainless steel. The outer walls of the inner welding cover (41) and the outer welding cover (3) are provided with heat dissipation micro-holes.

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