CN218136118U - Medium-large diameter metal steel pipe butt welding tool - Google Patents

Abstract

The invention discloses a butt welding tool for medium and large-diameter metal steel pipes, which solves the problems of high efficiency butt joint and convenient turnover when the medium and large-diameter metal steel pipes are butt welded; four movable sleeve frame trolleys are used as butt and turnover welding support rotating operation frames for two medium and large-caliber metal steel pipes; the sleeve frame trolley consists of a table type supporting underframe and a box-shaped liftable frame, universal wheels are mounted at the lower end of the table type supporting underframe, a hydraulic jack is arranged on the table type supporting underframe, a row of parallel welded steel pipe carrier rollers are arranged on the top end face of the box-shaped liftable frame, and the jack is controlled to jack the box-shaped liftable frame by operating a manual hydraulic pump of the hydraulic jack, so that the aim of accurately adjusting the height of the butted steel pipes is fulfilled; the steel pipes move on the carrier roller, so that the left and right positions of the two steel pipes are accurately butted; the direction of the movable sleeve frame trolley is changed, and convenient overturning is realized by means of a rotary wrench.

Description

Butt welding tool for medium and large-caliber metal steel pipes

Technical Field

The invention relates to a welding tool for metal steel pipes, in particular to a butt welding tool and a butt welding method for medium and large-diameter metal steel pipes.

Background

In an industrial factory building of a thermal power plant, pipelines for conveying media such as steam are generally arranged, the pipelines are formed by butt welding metal steel pipes with medium and large calibers, after two steel pipes are butted, girth welding is needed to be carried out at the butted position, the two butted steel pipes are fixedly connected together, and butt joint and overturning operation of steel pipe welded junctions are difficult due to the fact that the dead weight of the metal steel pipes with medium and large calibers is large; the prior art has the following problems when the metal steel pipe with medium and large caliber is welded in a butt joint way: (1) When the welded junctions of the two steel pipes are butted, the welding junctions are easy to have dislocation phenomenon and the phenomenon of uneven gap between the two welded junctions is easy to occur; (2) After the two steel pipes are butted, the operation of synchronously and uniformly overturning and welding the two steel pipes is difficult, and the operation requirement of welding by a welder in a better welding position cannot be met (the welder welds the better position and performs downward welding); (3) The efficiency of the butt joint operation of the two steel pipes and the efficiency of the circular seam welding work are both low.

Disclosure of Invention

The invention provides a tool for butt welding of medium and large-diameter metal steel pipes, which solves the technical problems of high efficiency butt joint and convenient overturning when the butt welding of the medium and large-diameter metal steel pipes is improved.

The invention solves the technical problems by the following technical scheme:

general concept of the invention: four movable sleeve frame trolleys (two trolleys lift one steel pipe) are adopted as butt welding support rotating operation frames for butt welding and overturning of two medium-large-diameter metal steel pipes; the sleeve frame trolley consists of a table type supporting underframe and a box-shaped liftable frame, universal wheels are mounted at the lower end of the table type supporting underframe, a hydraulic jack is arranged on the table type supporting underframe, a row of parallel welded steel pipe carrier rollers are arranged on the top end face of the box-shaped liftable frame, and the jack is controlled to jack the box-shaped liftable frame by operating a manual hydraulic pump of the hydraulic jack, so that the aim of accurately adjusting the height of the butted steel pipes is fulfilled; the steel pipes move on the carrier roller, so that the left and right positions of the two steel pipes are accurately butted; through the direction of the movable sleeve frame trolley of transform, and with the help of rotating the spanner, realize that the steel pipe rolls on the bearing roller, realize convenient upset.

A middle-large diameter metal steel pipe butt welding tool comprises a left side butt steel pipe, a right side butt steel pipe, a first movable sleeve frame trolley, a second movable sleeve frame trolley, a third movable sleeve frame trolley and a fourth movable sleeve frame trolley, wherein the four movable sleeve frame trolleys are completely identical in structure, the left side butt steel pipe is arranged between the top end of the first movable sleeve frame trolley and the top end of the second movable sleeve frame trolley, the right side butt steel pipe is arranged between the top end of the third movable sleeve frame trolley and the top end of the fourth movable sleeve frame trolley, and the right port of the left side butt steel pipe is in butt joint with the left port of the right side butt steel pipe; the movable sleeve frame trolley consists of an eight-immortal table type supporting underframe and a box type lifting frame, and the box type lifting frame is movably sleeved on the eight-immortal table type supporting underframe; the lower ends of four table leg upright posts of the eight-immortal table type supporting underframe are respectively provided with a universal wheel with a locking mechanism, a middle horizontal frame is arranged between the four table leg upright posts of the eight-immortal table type supporting underframe, the center of the middle horizontal frame is provided with a hydraulic jack, and the hydraulic jack is connected with a manual hydraulic pump; the box type lifting frame consists of a # -shaped horizontal frame and four square-shaped vertical frames, the # -shaped horizontal frame is arranged at the top end of the box type lifting frame, one square-shaped vertical frame is connected to two outer side ends of the same side of the # -shaped horizontal frame, and two outer side ends of the same side of the # -shaped horizontal frame are fixedly connected with a horizontal beam at the top end of the square-shaped vertical frame; carrier roller brackets are arranged on the well-shaped horizontal frame at equal intervals, longitudinal horizontal carrier rollers are arranged on the carrier roller brackets, the longitudinal horizontal carrier rollers are arranged in parallel, butt-joint steel pipes are arranged on the longitudinal horizontal carrier rollers arranged in parallel, and the central axes of the butt-joint steel pipes and the central axes of the longitudinal horizontal carrier rollers are arranged in a mutually perpendicular mode; the well-shaped horizontal frame is provided with a middle cross beam, and an output shaft of the hydraulic jack is propped against the lower bottom surface of the middle cross beam.

The top end face of a horizontal beam at the top end of the square vertical frame is provided with a limiting vertical rod jack of the butt joint steel pipe, the limiting vertical rod jack of the butt joint steel pipe is plugged with a limiting vertical rod of the butt joint steel pipe, the top end of the limiting vertical rod of the butt joint steel pipe is provided with a limiting pulley, and the limiting pulley is in jacking joint with the outer arc face of the butt joint steel pipe.

The table leg stand is made by square steel pipe, on the front outer side facade of table leg stand, is provided with the front side guide wheel, on the left outer side facade of table leg stand, is provided with the left side guide wheel, and the table leg stand sets up between the vertical upright frame of the mouth font of front side and the vertical upright frame of left mouth font, and front side guide wheel apical grafting is on the trailing flank of the vertical upright frame of right side of mouth font, and left side guide wheel apical grafting is on the left surface of the vertical upright frame of front side of left mouth font.

A butt welding method for medium and large caliber metal steel pipes is characterized by comprising the following steps:

the method comprises the following steps that firstly, a Baxian table type supporting underframe is manufactured, universal wheels with locking mechanisms are arranged at the lower ends of table leg upright columns of the Baxian table type supporting underframe, a middle horizontal frame is fixedly connected among the four table leg upright columns of the Baxian table type supporting underframe, and a hydraulic jack is arranged in the center of the middle horizontal frame and connected with a manual hydraulic pump;

step two, manufacturing a box type lifting frame, which comprises the following specific steps: respectively manufacturing a # -shaped horizontal frame and four square-shaped vertical frames, connecting one square-shaped vertical frame to two outer side ends of the same side of the # -shaped horizontal frame, and connecting the four square-shaped vertical frames and the # -shaped horizontal frame connected between the top ends of the four square-shaped vertical frames to form a box-shaped frame with an opening at the lower part; the middle cross beam is connected to the well-shaped horizontal frame; carrier roller brackets are arranged on the top end surface of the horizontal framework in the shape of the Chinese character jing at equal intervals, longitudinal horizontal carrier rollers are arranged on the carrier roller brackets, and the longitudinal horizontal carrier rollers are arranged in parallel;

thirdly, sleeving the box-type lifting frame manufactured in the second step on the Baxian table-type supporting underframe manufactured in the first step to form a first movable type sleeved frame trolley; manufacturing a second movable frame set trolley, a third movable frame set trolley and a fourth movable frame set trolley by the same method;

fourthly, arranging the first movable sleeve frame trolley and the second movable sleeve frame trolley side by side, and placing a left-side butt joint steel pipe between the top end face of the first movable sleeve frame trolley and the top end face of the second movable sleeve frame trolley, so that the central axis of the left-side butt joint steel pipe and the central axis of a carrier roller on the movable sleeve frame trolley are arranged vertically;

fifthly, arranging a third movable stock lifting trolley and a fourth movable stock lifting trolley side by side on the right side of the second movable stock lifting trolley, and placing a right side butt joint steel pipe between the top end surface of the third movable stock lifting trolley and the top end surface of the fourth movable stock lifting trolley, so that the central axis of the right side butt joint steel pipe and the central axis of a carrier roller on the movable stock lifting trolley are mutually and vertically arranged;

sixthly, pushing the movable sleeve frame trolley along the front-back direction, aligning the left butt joint steel pipe and the right butt joint steel pipe in the front-back direction, and locking and fixing the universal wheel; controlling a manual hydraulic pump, respectively controlling hydraulic jacks on the trolley frames, and enabling the central axis of the left butt joint steel pipe and the central axis of the right butt joint steel pipe to be positioned on the same straight line by jacking or lowering the box type liftable frame; pushing the left butted steel pipe to the right to enable the left butted steel pipe to move rightwards through the rolling of the carrier roller, or pushing the right butted steel pipe to the left to enable the right butted steel pipe to move leftwards through the rolling of the carrier roller, butting the right port of the left butted steel pipe and the left port of the right butted steel pipe together, forming a butt-welding seam between the two pairs of interfaces, and primarily connecting the two pipes together through spot welding;

seventhly, welding the upper half arc-shaped welding seam of the butt welding seam by using a welding rod to form an upper half arc-shaped welding seam;

eighthly, synchronously lifting the left butt joint steel pipe and the right butt joint steel pipe by controlling a manual hydraulic pump on the first movable stock lifting trolley and controlling a manual hydraulic pump on the fourth movable stock lifting trolley; then, the second movable stock lifting trolley and the third movable stock lifting trolley are moved out from the lower part of the butt-welded pipe;

ninth, the moved second movable sleeve frame trolley and the moved third movable sleeve frame trolley rotate by 90 degrees respectively, so that the central axis of the carrier roller on the second movable sleeve frame trolley and the central axis of the two butt-jointed welding pipes are in a state of being arranged in parallel; then the second movable type set frame trolley and the third movable type set frame trolley are moved back to the original position;

tenth, synchronously lowering the left-side butt-joint steel pipes and the right-side butt-joint steel pipes by controlling a manual hydraulic pump on the first movable jacket frame trolley and simultaneously controlling a manual hydraulic pump on the fourth movable jacket frame trolley to transfer the left-side butt-joint steel pipes and the right-side butt-joint steel pipes onto carrier rollers of the second movable jacket frame trolley and carrier rollers of the third movable jacket frame trolley, continuously lowering box type lifting frames of the first movable jacket frame trolley and the fourth movable jacket frame trolley, separating the first movable jacket frame trolley and the fourth movable jacket frame trolley from the two butt-joint steel pipes, and then moving out the first movable jacket frame trolley and the fourth movable jacket frame trolley;

step ten, clamping a left spanner on a left port of a left butt joint steel pipe, clamping a right spanner on a right port of a right butt joint steel pipe, synchronously rotating the two spanners to enable the left butt joint steel pipe to be on a carrier roller of a second movable type stock lifting trolley and the right butt joint steel pipe to be on a carrier roller of a third movable type stock lifting trolley, synchronously rotating the right butt joint steel pipe and rotating an upper semi-arc-shaped welding seam to the lower end; and welding the unwelded welding seam rotated to the upper end by the welding rod to form a lower semi-arc welding seam, wherein the upper semi-arc welding seam and the lower semi-arc welding seam form a butt annular welding seam of the left butt joint steel pipe and the right butt joint steel pipe.

The four movable sleeve frame trolleys are adopted, the aligning and overturning welding of the medium and large-diameter metal steel pipe construction site is realized, the movable sleeve frame trolleys are simple in structure, easy to manufacture, convenient to operate, low in cost, safe and efficient, accurate aligning of the medium and large-diameter metal steel pipe construction site can be guaranteed, overturning welding can be easily realized, and the excellent rate of aligning welding seams is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the mobile racker cart of the present invention;

fig. 3 is a schematic view of the structure of the table-type support chassis 7 of the invention;

FIG. 4 is a schematic structural view of the box-type liftable frame 8 of the present invention;

FIG. 5 is a schematic structural diagram of the left butt-jointed steel pipe 5 and the right butt-jointed steel pipe 6 of the present invention after butt-jointing in place;

FIG. 6 is a schematic view showing the upper half arc welding operation performed at the butt joint of two butt-jointed steel pipes according to the present invention;

FIG. 7 is a schematic view of the present invention showing the removal of the two intermediate mobile racker carts;

FIG. 8 is a schematic structural view of the intermediate two-wheeled stillage truck of the present invention after being turned 90 degrees and then returned again;

FIG. 9 is a schematic structural view of the transfer of two butt-welded steel pipes from the two side-mobile jacket frame trolleys to the two middle-mobile jacket frame trolleys according to the present invention;

FIG. 10 is a schematic structural view of two butt-welded steel pipes transferred from two side-movable jacket racks to two middle-movable jacket racks according to the present invention;

FIG. 11 is a schematic view of the two-sided mobile racker cart of the present invention after removal;

FIG. 12 is a schematic view of the butt welded steel pipe of the present invention rotated 180 degrees;

FIG. 13 is a schematic structural view of the butt welded steel pipes of the present invention rotated 180 degrees before welding;

fig. 14 is a schematic structural view of the present invention after welding two steel pipes.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings:

a middle-large diameter metal steel pipe butt welding tool comprises a left butt joint steel pipe 5, a right butt joint steel pipe 6, a first movable sleeve frame trolley 1, a second movable sleeve frame trolley 2, a third movable sleeve frame trolley 3 and a fourth movable sleeve frame trolley 4, wherein the four movable sleeve frame trolleys are completely identical in structure, the left butt joint steel pipe 5 is arranged between the top end of the first movable sleeve frame trolley 1 and the top end of the second movable sleeve frame trolley 2, the right butt joint steel pipe 6 is arranged between the top end of the third movable sleeve frame trolley 3 and the top end of the fourth movable sleeve frame trolley 4, and the right port of the left butt joint steel pipe 5 is in butt joint with the left port of the right butt joint steel pipe 6; the movable type stock lifting trolley consists of a table type supporting underframe 7 and a box type lifting frame 8, wherein the box type lifting frame 8 is movably sleeved on the table type supporting underframe 7; universal wheels 13 with locking mechanisms are arranged at the lower ends of four table leg upright posts 12 of the eight-immortal table type supporting underframe 7, a middle horizontal frame 9 is arranged between the four table leg upright posts 12 of the eight-immortal table type supporting underframe 7, a hydraulic jack 10 is arranged at the center of the middle horizontal frame 9, and a manual hydraulic pump 11 is connected to the hydraulic jack 10; the box type lifting frame 8 is composed of a # -shaped horizontal frame 14 and four square-shaped vertical frames 15, the # -shaped horizontal frame 14 is arranged at the top end of the box type lifting frame 8, the square-shaped vertical frames 15 are connected to two outer side ends of the # -shaped horizontal frame 14 on the same side, and the two outer side ends of the # -shaped horizontal frame 14 on the same side are fixedly connected with a horizontal beam at the top end of the square-shaped vertical frame 15; carrier roller brackets 16 are arranged on the well-shaped horizontal frame 14 at equal intervals, longitudinal horizontal carrier rollers 17 are arranged on the carrier roller brackets 16, the longitudinal horizontal carrier rollers 17 are arranged in parallel, butt-jointed steel pipes are arranged on the longitudinal horizontal carrier rollers 17 arranged in parallel, and the central axes of the butt-jointed steel pipes and the central axes of the longitudinal horizontal carrier rollers 17 are arranged in a mutually perpendicular manner; the horizontal frame 14 is provided with a middle cross beam 23, and the output shaft of the hydraulic jack 10 is abutted on the lower bottom surface of the middle cross beam 23.

A butt welding method for medium and large caliber metal steel pipes is characterized by comprising the following steps:

firstly, manufacturing a table type supporting underframe 7, arranging universal wheels 13 with locking mechanisms at the lower ends of table leg upright posts 12 of the table type supporting underframe 7, fixedly connecting a middle horizontal frame 9 among the four table leg upright posts 12 of the table type supporting underframe 7, arranging a hydraulic jack 10 at the center of the middle horizontal frame 9, and connecting the hydraulic jack 10 with a manual hydraulic pump 11;

and secondly, manufacturing a box type lifting frame 8, which comprises the following specific steps: respectively manufacturing a # -shaped horizontal frame 14 and four square-shaped vertical frames 15, connecting one square-shaped vertical frame 15 to two outer side ends of the same side of the # -shaped horizontal frame 14, and forming a box-shaped frame with an opening at the lower part, wherein the four square-shaped vertical frames 15 and the # -shaped horizontal frame 14 are connected between the top ends of the four square-shaped vertical frames 15; the middle cross beam 23 is connected to the horizontal framework 14; carrier roller brackets 16 are arranged on the top end surface of the # -shaped horizontal frame 14 at equal intervals, longitudinal horizontal carrier rollers 17 are arranged on the carrier roller brackets 16, and the longitudinal horizontal carrier rollers 17 are arranged in parallel;

thirdly, sleeving the box-type lifting frame 8 manufactured in the second step on the Baxian table-type supporting underframe 7 manufactured in the first step to form a first movable type sleeved frame trolley 1; manufacturing a second movable frame set trolley 2, a third movable frame set trolley 3 and a fourth movable frame set trolley 4 by the same method;

fourthly, arranging the first movable sleeve frame trolley 1 and the second movable sleeve frame trolley 2 side by side, and placing the left butt joint steel pipe 5 between the top end face of the first movable sleeve frame trolley 1 and the top end face of the second movable sleeve frame trolley 2, so that the central axis of the left butt joint steel pipe 5 and the central axis of a carrier roller on the movable sleeve frame trolley are arranged vertically to each other;

fifthly, arranging a third movable sleeve frame trolley 3 and a fourth movable sleeve frame trolley 4 in parallel on the right side of the second movable sleeve frame trolley 2, and placing a right side butt joint steel pipe 6 between the top end face of the third movable sleeve frame trolley 3 and the top end face of the fourth movable sleeve frame trolley 4 to enable the central axis of the right side butt joint steel pipe 6 and the central axis of a carrier roller on the movable sleeve frame trolley to be mutually and vertically arranged;

sixthly, pushing the movable sleeve frame trolley along the front-back direction, aligning the left butt joint steel pipe 5 and the right butt joint steel pipe 6 in the front-back direction, and locking and fixing the universal wheels 13; controlling a manual hydraulic pump 11, respectively controlling hydraulic jacks 10 on each set of frame trolleys, and enabling the central axis of the left butt joint steel pipe 5 and the central axis of the right butt joint steel pipe 6 to be in the same straight line by jacking or descending respective box type liftable frames; pushing the left butted steel pipe 5 to the right to enable the left butted steel pipe to move rightwards through the rolling of the carrier roller, or pushing the right butted steel pipe 6 to the left to enable the right butted steel pipe to move leftwards through the rolling of the carrier roller, butting the right port of the left butted steel pipe 5 and the left port of the right butted steel pipe 6 together, forming a butt-welding seam 24 between the two pairs of interfaces, and primarily connecting the two pipes together through spot welding;

seventhly, welding the upper half arc-shaped welding seam of the butt welding seam 24 by using a welding rod 25 to form an upper half arc-shaped welding seam 26;

eighthly, synchronously lifting the left butt joint steel pipe 5 and the right butt joint steel pipe 6 by controlling a manual hydraulic pump 11 on the first movable stock lifting trolley 1 and controlling a manual hydraulic pump on the fourth movable stock lifting trolley 4; then, the second movable type sleeve frame trolley 2 and the third movable type sleeve frame trolley 3 are moved out from the lower part of the butt-welded pipe;

ninthly, respectively rotating the moved second movable stock rack trolley 2 and the moved third movable stock rack trolley 3 by 90 degrees to enable the central axis of the carrier roller on the second movable stock rack trolley and the central axis of the two butt-joint welded pipes to be in a state of being parallel to each other; then the second movable stock lifting trolley 2 and the third movable stock lifting trolley 3 are moved back to the original position;

tenth step, synchronously lowering the left-side butt-joint steel pipe 5 and the right-side butt-joint steel pipe 6 by controlling a manual hydraulic pump 11 on the first movable jacket frame trolley 1 and simultaneously controlling a manual hydraulic pump on the fourth movable jacket frame trolley 4 to transfer the left-side butt-joint steel pipe 5 and the right-side butt-joint steel pipe 6 to a carrier roller of the second movable jacket frame trolley 2 and a carrier roller of the third movable jacket frame trolley 3, continuously lowering a box-type liftable frame 8 of the first movable jacket frame trolley 1 and a box-type liftable frame of the fourth movable jacket frame trolley 4 to separate the first movable jacket frame trolley 1 and the fourth movable jacket frame trolley 4 from the two butt-joint steel pipes, and then moving out the first movable jacket frame trolley 1 and the fourth movable jacket frame trolley 4;

step eleven, clamping a left spanner 27 on a left port of the left butt joint steel pipe 5, clamping a right spanner 28 on a right port of the right butt joint steel pipe 6, synchronously rotating the two spanners to enable the left butt joint steel pipe 5 to be on a carrier roller of the second movable stock lifting trolley 2 and the right butt joint steel pipe 6 to be on a carrier roller of the third movable stock lifting trolley 3, synchronously rotating the two spanners and rotating the upper half arc-shaped welding seam 26 to the lower end; and welding the unwelded welding seam rotated to the upper end by a welding rod to form a lower semi-arc welding seam 29, wherein the upper semi-arc welding seam 26 and the lower semi-arc welding seam 29 form a butt annular welding seam of the left butt joint steel pipe 5 and the right butt joint steel pipe 6.

A limiting vertical rod inserting hole 18 of a butt joint steel pipe is formed in the top end face of a horizontal beam at the top end of the square vertical frame 15, a limiting vertical rod 19 of the butt joint steel pipe is inserted in the limiting vertical rod inserting hole 18 of the butt joint steel pipe, a limiting pulley 20 is arranged at the top end of the limiting vertical rod 19 of the butt joint steel pipe, and the limiting pulley 20 is connected with the outer arc-shaped face of the butt joint steel pipe in a jacking mode; the limiting upright posts 19 on each movable stock trolley are arranged in pairs and are arranged at the front and the rear outer sides of the butted steel tubes, and the limiting pulleys 20 arranged in pairs play a role in limiting the butted steel tubes, so that the central axis position of the steel tubes is unchanged during movement or rotation, and accurate butting of the butted steel tubes is ensured.

The table leg upright post 12 is made of square steel pipes, a front guide wheel 21 is arranged on the front outer side vertical face of the table leg upright post 12, a left guide wheel 22 is arranged on the left outer side vertical face of the table leg upright post 12, the table leg upright post 12 is arranged between the square vertical upright frame 15 on the front side and the square vertical upright frame on the left side, the front guide wheel 21 is abutted against the rear side face of the right upright post of the square vertical upright frame 15, and the left guide wheel 22 is abutted against the left side face of the front upright post of the square vertical upright frame on the left side; when the box type lifting frame 8 is lifted by the hydraulic jack 10, 8 upright posts of the edge-shaped vertical upright frame vertically face upwards by the 16 guide wheels, so that the box type lifting frame vertically moves upwards or downwards, and the synchronous lifting or descending of the two butt joint steel pipes is ensured.

Claims (3)

1. A middle-large diameter metal steel pipe butt welding tool comprises a left butt joint steel pipe (5), a right butt joint steel pipe (6), a first movable sleeve frame trolley (1), a second movable sleeve frame trolley (2), a third movable sleeve frame trolley (3) and a fourth movable sleeve frame trolley (4), wherein the four movable sleeve frame trolleys are completely identical in structure, the left butt joint steel pipe (5) is arranged between the top end of the first movable sleeve frame trolley (1) and the top end of the second movable sleeve frame trolley (2), the right butt joint steel pipe (6) is arranged between the top end of the third movable sleeve frame trolley (3) and the top end of the fourth movable sleeve frame trolley (4), and the right end opening of the left butt joint steel pipe (5) and the left end opening of the right butt joint steel pipe (6) are in butt joint; the movable type frame sleeving trolley is characterized by comprising a table type supporting underframe (7) and a box type lifting frame (8), wherein the box type lifting frame (8) is movably sleeved on the table type supporting underframe (7); the lower ends of four table leg upright posts (12) of the eight-immortal table type supporting underframe (7) are respectively provided with a universal wheel (13) with a locking mechanism, a middle horizontal frame (9) is arranged among the four table leg upright posts (12) of the eight-immortal table type supporting underframe (7), the center of the middle horizontal frame (9) is provided with a hydraulic jack (10), and the hydraulic jack (10) is connected with a manual hydraulic pump (11); the box type lifting frame (8) consists of a groined horizontal frame (14) and four square vertical frames (15), the groined horizontal frame (14) is arranged at the top end of the box type lifting frame (8), the two outer side ends on the same side of the groined horizontal frame (14) are connected with one square vertical frame (15), and the two outer side ends on the same side of the groined horizontal frame (14) are fixedly connected with a horizontal beam at the top end of the square vertical frame (15); carrier roller brackets (16) are arranged on the groined horizontal frame (14) at equal intervals, longitudinal horizontal carrier rollers (17) are arranged on the carrier roller brackets (16), the longitudinal horizontal carrier rollers (17) are arranged in parallel, butt joint steel pipes are arranged on the longitudinal horizontal carrier rollers (17) which are arranged in parallel, and the central axes of the butt joint steel pipes and the central axes of the longitudinal horizontal carrier rollers (17) are arranged in a mutually perpendicular mode; a middle cross beam (23) is arranged on the horizontal framework (14) in the shape of a Chinese character 'jing', and an output shaft of the hydraulic jack (10) is propped against the lower bottom surface of the middle cross beam (23).

2. The tool for butt welding of the medium and large-diameter metal steel pipes according to claim 1, wherein limiting vertical rod jacks (18) for butt welding of the steel pipes are arranged on the top end faces of the horizontal beams at the top ends of the square-shaped vertical frames (15), limiting vertical rods (19) for butt welding of the steel pipes are inserted into the limiting vertical rod jacks (18) for butt welding of the steel pipes, limiting pulleys (20) are arranged at the top ends of the limiting vertical rods (19) for butt welding of the steel pipes, and the limiting pulleys (20) are abutted against the outer arc-shaped faces of the butt welding of the steel pipes.

3. The tool for butt welding of the medium and large diameter metal steel pipes according to claim 2, wherein the table leg upright (12) is made of square steel pipes, a front side guide wheel (21) is arranged on a front outer side vertical face of the table leg upright (12), a left side guide wheel (22) is arranged on a left outer side vertical face of the table leg upright (12), the table leg upright (12) is arranged between the square vertical upright (15) on the front side and the square vertical upright on the left side, the front side guide wheel (21) is abutted against a rear side face of the right side upright of the square vertical upright (15), and the left side guide wheel (22) is abutted against a left side face of the front side upright of the square vertical upright on the left side.

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