A double-sided submerged arc welding spiral steel pipe forming device

Abstract

The present application relates to spiral steel pipe forming technical field, and disclose a kind of double-sided submerged arc welding spiral steel pipe forming equipment, including base, the base upper end is equipped with forming pipe, the front side of the forming pipe is equipped with inlet, the front end of the forming pipe is fixedly connected with feeding mechanism installed on base to be obliquely sent into inlet by steel strip, the sidewall of the forming pipe is equipped with row roller, the outer wall of the forming pipe is fixedly connected with the outer welding cover in spiral shape, the top of the outer welding cover is equipped with outer welding head, the bottom of the outer welding cover is fixedly connected with F type suction pipe.The present application is output by steel strip spiral and inner and outer arc welding, and inner and outer brush roller is automatically ground and cleaned by welding slag, and the right end edge of inner and outer welding cover is further matched with scraping cleaning, welding slag and overflowed flux are all collected by negative pressure suction inside inner and outer welding cover, then cooperate with slag collecting component vibration and cooling to release welding slag, so as to improve the cleaning and collection effect of welding slag and flux and the safety and reliability of collection.

Description

Technical Field

[0001] This invention relates to the field of spiral steel pipe forming technology, specifically to a double-sided submerged arc welding spiral steel pipe forming equipment. Background Technology

[0002] Spiral welded steel pipe is a type of spiral welded steel pipe made from strip steel coils as raw materials, formed by cold extrusion, and welded by automatic double-wire double-sided submerged arc welding process. The advanced double-sided submerged arc welding process can achieve welding in the optimal position, making it less prone to defects such as misalignment, weld deviation, and incomplete penetration, resulting in high welding quality. In the double-sided submerged arc welding process, a continuously fed welding wire is used as the electrode, and the arc is ignited under the "burial" of a granular flux layer. The heat of the arc melts the welding wire, base material, and part of the flux, forming a molten pool and slag, which finally cools and solidifies into a weld.

[0003] Chinese patent application CN119237888A discloses a double-sided submerged arc welding spiral steel pipe forming device. The device includes a long rod at the center of a rotating assembly, with a carrier installed at the end of the rod furthest from the rotating assembly. Four grooves are evenly distributed on the outer wall of the carrier. This invention, through the carrier and groove arrangement, allows the long strip of iron to move along the inclined direction of the forming wheel inside the pipe. The inclined direction of the forming wheel provides spiral guidance for the long strip of iron, forming a spiral pipe. When the spiral pipe passes through the welding torch, the welding torch welds the spiral gaps on the spiral pipe. During the welding process, the resulting slag falls into the grooves and is collected, thus solving the problem of subsequently cleaning the slag from the inner wall of the spiral pipe after forming.

[0004] In the process of using the double-sided submerged arc welding spiral steel pipe forming device in the above-mentioned patent, the reciprocating movement of the brush ring is used to clean the welding slag on the outer wall of the spiral steel pipe. Since the welding slag still has residual welding heat, it is easy to damage the brush ring. Moreover, the weld slag that adheres to the surface of the spiral steel pipe is relatively firm, making it difficult to reliably clean with the brush ring. In addition, during actual welding, there are also problems of weld slag spatter and flux overflow, which reduces the cleaning and collection effect. When using the groove to collect the weld slag that falls from the weld, the weld slag is generally in a molten state. After the molten weld slag solidifies, it is easy to stick to the inner wall of the groove, making subsequent pouring and discharge inconvenient. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of poor cleaning and collection effect and inadequate treatment of molten weld slag in general double-sided submerged arc welding spiral steel pipe forming devices during use. This invention provides a double-sided submerged arc welding spiral steel pipe forming device.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A double-sided submerged arc welding spiral steel pipe forming equipment includes a base, a forming pipe installed on the upper end of the base, a material port opened on the front side of the forming pipe, a feeding mechanism installed on the base for obliquely feeding steel strip into the material port fixedly connected to the front end of the forming pipe, a row of rollers installed on the side wall of the forming pipe, a spiral outer welding cover fixedly clamped to the outer wall of the forming pipe, an outer welding head installed on the top of the outer welding cover, an F-type suction pipe fixedly connected to the bottom of the outer welding cover, a plurality of outer brush rollers arranged in the middle of the inner cavity of the outer welding cover, and a spiral welding groove corresponding to the outer welding cover on the outer wall of the forming pipe.

[0008] A suction branch pipe extending into the forming tube is fixedly inserted into the left side of the base. A spiral inner welding cover is fixedly connected to the suction branch pipe. An inner welding head is installed on the lower wall of the inner welding cover. Several inner brush rollers are provided on the right side of the inner cavity of the inner welding cover. 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.

[0009] Furthermore, there are two rollers, which are respectively installed on the rear wall and the upper wall of the forming tube. The upper roller is positioned to the right of the rear roller, and the rollers have several guide rollers whose axis is parallel to the axis of the forming tube.

[0010] Furthermore, the left end of the inner welding cover is aligned with the left end of the outer welding cover, and the left end of the outer welding cover faces downward. There are gaps between the outer welding cover and the inner welding cover and the side wall of the spiral steel pipe. The outer welding cover has one spiral turn, and the inner welding cover has one and a half spiral turns.

[0011] Furthermore, an outer scraper is fixedly connected to the right end of the outer welding cover, and an inner scraper is fixedly connected to the right end of the inner welding cover. Both the inner and outer scrapers can move and abut against the side wall of the spiral steel pipe. The inner and outer scrapers are both provided with corresponding inclined blade edges at the ends of the inner and outer scrapers near the spiral steel pipe.

[0012] Furthermore, several outer shaft rollers are rotatably connected from top to bottom in the middle of the outer welding cover, and the outer brush roller is fixedly sleeved on the outer shaft roller. Several inner shaft rollers are rotatably connected from top to bottom on the front side of the inner welding cover, and the inner brush roller is fixedly sleeved on the inner shaft roller. The radii of the inner shaft roller and the outer shaft roller gradually increase from top to bottom.

[0013] Furthermore, the left end of the forming tube has a shaft frame, and both the inner shaft roller and the outer shaft roller are rotatably mounted on the shaft frame. A drive shaft is rotatably connected to the shaft frame, and the drive shaft 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 and the outer shaft roller and the left end of the drive shaft.

[0014] Furthermore, the F-type suction tube is connected to the left end and bottom of the outer welding cover, respectively, and the rear end of the F-type suction tube is connected to a negative pressure suction mechanism.

[0015] Furthermore, the slag collection assembly includes several top columns disposed on the inner wall of the left end enclosure of the inner welding cover. A sliding frame that is slidably engaged with the top columns is slidably fitted onto the inner wall of the left side of the inner welding cover. The bottom of the front wall of the sliding frame is tilted backward. An L-shaped elastic plate that is elastically connected to the inner wall of the inner welding cover is fixedly connected to the front end of the sliding frame. A cam that movably abuts against the L-shaped elastic plate is fixedly fitted onto the top inner shaft roller.

[0016] Furthermore, the right end of the inner welding cover is connected to the right end of the suction branch pipe, the left end of the suction branch pipe is connected to a negative pressure suction mechanism, and the slag collection assembly also includes 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. The left wall of the sliding frame has a through hole corresponding to the T-shaped branch pipe. A telescopic cylinder is fixedly connected between the left end of the T-shaped branch pipe and the suction branch pipe. The telescopic end on the right side of the telescopic cylinder is slidably and sealingly connected to the inner wall of the T-shaped branch pipe and aligned with the inner wall of the inner welding cover.

[0017] Furthermore, the slag collection assembly also includes a heat dissipation duct fixedly connected to the left wall of the inner welding cover. A duct sleeved on the top inner shaft roller is fixedly connected to the left wall of the heat dissipation duct. The front end of the duct is sealed and the rear end is open. A fan is installed on the top inner shaft roller and is located in the duct. The inner welding cover, outer welding cover and sliding frame are all made of aluminum alloy or stainless steel. Heat dissipation micropores are opened on the outer walls of the inner welding cover and outer welding cover.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention uses an inclined feeding mechanism to feed steel strip into the forming tube from the feed port. When the steel strip is spirally output to the right with the guide rollers, the outer and inner welding heads successively perform submerged arc welding on the spiral steel pipe. During this process, the inner and outer brush rollers grind and clean the weld slag inside and outside the weld area of ​​the spiral steel pipe after welding. The right edge of the inner and outer welding covers scrapes and cleans the residual weld slag after grinding and cleaning the surface of the spiral steel pipe. The cleaned weld slag and overflowing flux are collected at the corresponding low points in the spiral area inside the inner and outer welding covers and are extracted by the F-type suction pipe and suction branch pipe, thereby improving the cleaning and collection effect of weld slag and flux and reducing the subsequent cleaning burden.

[0020] 2. This invention collects the welding slag that falls off the external welding head during welding by vibrating the slag collection component, thereby preventing the molten welding slag from solidifying inside the slag collection component. Combined with cooling the welding slag during the slag collection process and releasing it after cooling, the safety and reliability of welding slag collection are improved. Attached Figure Description

[0021] Figure 1 The three-dimensional structure of the molding equipment of this invention Figure 1 ;

[0022] Figure 2 The three-dimensional structure of the molding equipment of this invention Figure 2 ;

[0023] Figure 3 This is a three-dimensional structural diagram of the forming tube and feeding mechanism of the forming equipment of the present invention;

[0024] 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;

[0025] 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;

[0026] 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;

[0027] 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;

[0028] Figure 8 This is a three-dimensional structural diagram of the sliding frame and telescopic cylinder of the molding equipment of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the outer and inner welding covers of the molding equipment of the present invention;

[0030] Figure 10 This is a three-dimensional structural diagram of the forming tube and roller section of the forming equipment of the present invention.

[0031] 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

[0032] 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.

[0033] Example 1, as Figures 1-10As 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.

[0034] A suction branch pipe 4 extending into the forming tube 2 is fixedly inserted into the left side of the base 1. 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.

[0035] 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 rollers 21 have several guide rollers whose axis is parallel to the axis of the forming tube 2.

[0036] During use, both the outer welding head 31 and the inner welding head 42 are equipped with flux release and flux negative pressure suction recovery functions as found in existing technologies. The steel strip is fed into the forming tube 2 through the feeding mechanism 22 at an inclination. With the help of the two left and right rollers 21 on the rear and upper walls of the forming tube 2, and several guide rollers with their axes parallel to the axis of the forming tube 2, the steel strip is guided and automatically wound to form a spiral steel pipe that is output to the right. During output, the outer welding head 31 and the inner welding head 42 respectively perform submerged arc welding on the outer and inner walls of the spiral steel pipe. During welding, the inner brush roller 45 and the outer brush roller 35 grind and clean the weld slag inside and outside the weld area of ​​the spiral steel pipe after welding. The right edge of the outer welding cover 3 and the right edge of the inner welding cover 41 scrape and clean the residual weld slag after grinding and cleaning the surface of the spiral steel pipe. The outer welding head 31 and the inner welding cover 42 then scrape and clean the residual weld slag. 1. Welding slag that falls during welding is collected by the slag collection assembly. Since the welding slag and overflowing flux are collected inside the outer welding cover 3 and the inner welding cover 41, and they all fall into the corresponding low points of the spiral area in the outer welding cover 3 and the inner welding cover 41, the welding slag and overflowing flux accumulated at the low points can be sucked and cleaned in conjunction with the control of the F-type suction pipe 33 and the suction branch pipe 4, thereby improving the cleaning and collection effect of welding slag and flux, avoiding the problems of welding slag splashing and flux overflow, and reducing the subsequent cleaning burden. Since the welding slag is collected by vibration during use, the welding slag in the molten state is prevented from solidifying inside the slag collection assembly. In conjunction with the cooling and cooling of the welding slag during the slag collection process, and the release after cooling, the safety and reliability of welding slag collection are improved.

[0037] In Example 2, based on the above examples, 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 are gaps 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.

[0038] 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.

[0039] The right end of the inner welded cover 41 is connected to the right end of the suction branch pipe 4, and the left end of the suction branch pipe 4 is connected to a negative pressure suction mechanism.

[0040] The design of gaps between the outer welding cover 3 and the inner welding cover 41 and the side wall of the spiral steel pipe avoids mutual wear between them. When the flux released by the outer welding head 31 overflows forward or backward, and when welding of the outer welding head 31 and grinding of the outer brush roller 35 result in the generation of welding slag, the flux and welding slag will automatically fall into the rear side and bottom of the inner cavity of the outer welding cover 3 under the action of gravity, and will be sucked away by the F-type suction pipe 33. Correspondingly, when welding slag is generated due to grinding of the inner brush roller 45, the welding slag will automatically fall into the front part of the right inner cavity of the inner welding cover 41 under the action of gravity, and will be sucked away by the suction branch pipe 4. For a small amount of welding slag or flux that accidentally falls into the middle of the inner cavity of the inner welding cover 41, it can be discharged by the negative pressure suction and recovery action of the inner welding head 42.

[0041] In Example 3, based on the above examples, an outer scraper 32 is fixedly connected to the right end of the outer welding cover 3, and an inner scraper 43 is fixedly connected to the right end of the inner welding cover 41. Both the inner scraper 43 and the outer scraper 32 can move and abut against the side wall of the spiral steel pipe. The inner scraper 43 and the outer scraper 32 are both provided with corresponding inclined blades at the ends near the spiral steel pipe.

[0042] During welding, the outer brush roller 35 and inner brush roller 45 grind and clean the weld slag inside and outside the weld area after the spiral steel pipe is welded. As the weld moves, the outer scraper 32 and inner scraper 43 automatically use their corresponding cutting edges to further clean the residual weld slag on the surface of the spiral steel pipe after grinding and cleaning, thereby improving the cleaning effect.

[0043] In Example 4, based on the above examples, a number of outer shaft rollers 34 are rotatably connected from top to bottom in the middle of the outer welding cover 3, and an outer brush roller 35 is fixedly sleeved on the outer shaft roller 34. A number of inner shaft rollers 44 are rotatably connected from top to bottom on the front side of the inner welding cover 41, and an 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.

[0044] When the weld seam on the spiral steel pipe is conveyed to the right, it 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 force on the weld slag during a single grinding, thus improving the detachment effect.

[0045] In Example 5, based on the above examples, the left end of the forming tube 2 has a shaft frame, and 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.

[0046] The drive shaft 23 is rotated by a motor, and the transmission belt can synchronously drive the inner shaft rollers 44 and outer shaft rollers 34 so that the inner brush rollers 45 and outer brush rollers 35 can grind the welding slag. The control is convenient and reliable.

[0047] In Example 6, based on the above examples, the slag collection assembly includes several top columns 5 disposed on the inner wall of the left end enclosure of the inner welding cover 41. A sliding frame 51 is slidably engaged with the top columns 5 on the inner wall of the left side of the inner welding cover 41. The bottom of the front wall of the sliding frame 51 is tilted backward. An L-shaped elastic plate 52 is fixedly connected to the front end of the sliding frame 51 and elastically connected to the inner wall of the inner welding cover 41. A cam 46 is fixedly sleeved on the top inner shaft roller 44 and movably abuts against the L-shaped elastic plate 52.

[0048] The inner roller 44 rotates, driving the cam 46 to press the L-shaped elastic plate 52. The L-shaped elastic plate 52 pulls the slide frame 51 to move upward. After the cam 46 passes the L-shaped elastic plate 52, the L-shaped elastic plate 52 uses its own elasticity to drive the slide frame 51 to reset. As the cam 46 rotates continuously, the slide frame 51 vibrates continuously and moves continuously on the top column 5. When the outer welding head 31 welds the joint of the outer wall of the spiral steel pipe, the falling molten welding slag will enter the slide frame 51 and slide along the slide frame 51 to the bottom, thereby avoiding welding slag adhesion and affecting subsequent discharge.

[0049] In embodiment seven, based on the above embodiments, the slag collection assembly further 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 has 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 telescopic end on the right side of the telescopic cylinder 54 is slidably and sealingly connected to the inner wall of the T-shaped branch pipe 53 and aligned with the inner wall of the inner welding cover 41.

[0050] The slag collection assembly also includes a heat dissipation duct 55 fixedly connected to the left wall of the inner welding cover 41. A duct 56 sleeved on the top inner shaft roller 44 is fixedly connected to the left wall of the heat dissipation duct 55. The front end of the duct 56 is sealed and the rear end is open. A fan 47 is installed on the top inner shaft roller 44 and is located in the duct 56. The inner welding cover 41, the outer welding cover 3 and the sliding frame 51 are all made of aluminum alloy or stainless steel. Heat dissipation micro-holes are opened on the outer walls of the inner welding cover 41 and the outer welding cover 3.

[0051] Initially, the T-shaped branch pipe 53 is in a blocked state, thus preventing the molten welding slag from being directly sucked away. As the sliding frame 51 vibrates continuously, and the inner shaft roller 44 drives the fan 47 to blow air into the heat dissipation air duct 55 through the air duct 56, the air dissipates heat from 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, which are made of aluminum alloy or stainless steel and have heat dissipation micropores, are used to prevent the accumulation of welding heat and affect the welding quality of the spiral steel pipe. After the welding is completed, the telescopic cylinder 54 is controlled to retract, making the interior of the T-shaped branch pipe 53 open, and the cooling and solidified welding slag can be sucked away and cleaned by using the suction branch pipe 4.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, 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, A forming tube (2) is installed on the upper end of the base (1). A material inlet is opened on the front side of the forming tube (2). A feeding mechanism (22) for obliquely feeding steel strip into the material inlet is fixedly connected to the front end of the forming tube (2). A roller (21) is installed on the side wall of the forming tube (2). 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 positioned to the right of the rear roller (21). The roller (21) has several guide rollers with the axis parallel to the axis of the forming tube (2). 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). Several outer brush rollers (35) are provided in the middle of the inner cavity of the outer welding cover (3). 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). 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. 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 side of the inner cavity of the inner welding cover (41) near the right end. A slag collection assembly that drives the welding slag to vibrate and cool and release is provided on the side of the inner cavity of the inner welding cover (41) near the left end. 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.

2. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 1, 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.

3. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 2, 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).

4. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 3, 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.

5. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 4, 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).

6. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 5, 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).

7. The double-sided submerged arc welding spiral steel pipe forming equipment according to claim 6, 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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