RU1363658C - Divces for assemling and oaligning pipes for welding - Google Patents

Abstract

The invention relates to welding production, in particular to devices for assembling and centering pipes for welding under installation conditions in the construction of pipelines, and can be used in the chemical, oil and gas industries, as well as in power engineering. The aim of the invention is to improve the quality of the assembly by tightening the pipes while centering them. The device comprises a housing 1, at the ends of which support prisms 5 are rigidly fixed, made in the form of combs with grooves 12 and 13 inclined at an angle to the axis O-O of the device. The centering element in the form of a cable 14 is passed through the grooves 12 and 13 and through the stationary rollers 9 and 10, is locked onto the movable rollers 7, mounted with the possibility of moving in opposite directions with the screw 2. When the rollers 7 are pulled apart, the cable 14 is tensioned and bends in the grooves 12 and 13, with this, an axial force arises, tightening the centered tubes 15. 2 3. p. f., 5 ill., 1 table. (L CZ with a co. O5 ate (X)

Description

The invention relates to welding production, in particular to devices for assembling and centering pipes for welding under installation conditions in the construction of pipelines, and can be used in various industries, in particular in the chemical, oil and gas industries as well as in power engineering.

The aim of the invention is to improve the quality of the assembly by tightening the pipes while centering them.

In FIG. I shows a device after finishing pulling and centering the pipes, general view; in FIG. 2 is a view along arrow A in FIG. ; in FIG. 3 is a section along BB of FIG. I, in FIG. 4 is a view along arrow B in FIG. 2; in FIG. 5 is a diagram of the forces acting in the assembly and centering of pipes joined for welding.

The device for assembling and centering the pipes for welding contains a housing I (see Fig. I), made in the form of a duct (see Fig. 3), along which a tension screw 2, made with two opposite left and right threads, is missing, on which Nuts are mounted 3. Two rods 4 are welded symmetrically to the O-O of the housing perpendicularly to the tensioning screw along the edges of the housing; prisms 5 are rigidly fixed. Each nut 3 is connected by a screw 6 to a movable roller 7 n and can be moved along the axis tensioning screw 2 within the slot 8 made in to case I. On each rod .ge 4 successively along the height along a line perpendicular to the working surface of prism 5, two fixed rollers are fixed: the upper 9 and the lower 10 (see Fig. 1). On the reverse side, rods 4 (see Fig. 2) are attached with hooks li located at three different levels in height relative to the working surfaces of the prism 5.

Prisms 5 (see Fig. 1) are made in the form of combs with grooves inclined at an angle a of 5-8 ° relative to the rods 4 to the sides, opposite from the axis of symmetry of the body, the opposite points a, b (Fig. 5 ) the outer pas, call 12 of these prisms lie on lines D that touch the working surfaces of the upper fixed rollers 9, and the opposite points c, d of the internal grooves 13 of each of the prisms 5, on lines X E, which touch the working surfaces of the lower fixed rollers 10. The endless flexible element of the cable 14 folded in half, secured by a two parallel bubbled legs of one side of the housing 1 in the hook 11, then every branch of the cable 14, covering the welded pipe 15;

passed through the corresponding grooves 12, 13 of each comb of the prisms 5. inner branches — through each lower guide roller 10, and then both branches,

folded together, along the working surfaces of the upper guide rollers 9, and then stored in tension rollers 7. The device operates as follows. First, install prisms 5 on the pipe 15 to be welded (see Fig. 1, 2), a. the cable 14 is folded in the form of a double loop, two parallel branches are formed, one end of the loop is fixed on the hook 11, and the other, covering the pipe 15 and passing through the grooves 12, 13 of the comb of the prisms 5,

the fixed rollers 9 and 10 are stored in movable rollers 7, which at the initial moment are in a shifted position, close to the axis O-O of the housing. Then, by turning the handle of the tensioning screw 2, the nuts 3 with the movable rollers 7 are moved along the slots 8 to the sides of the symmetry axis of the housing, the flexible element 14 is tensioned, and therefore the pipes 15 are assembled and centered under

5 welding.

The force F arising in the flexible element 14 (see Fig. 5) is directed at an angle E relative to the axis, since naSbi 1 and 13 are tilted relative to the rods 4 on the ANGLE in the prism 5 and the link of the flexible element 14 passes through groove points, a, b, Cj d along the lines D and E, which are parallel to each other. Moreover, since the cable 14 has a certain thickness di and has great rigidity, when passing through the grooves 12 and 13 it cannot maintain its strictly vertical position and deviates by a certain angle P, at which the force F acts, expanding to the force components FI, which presses the tube 15 against the prism 5, and Fj, which moves the workpieces of the tube 15 along its longitudinal axis towards each other. After the end of the joining process and the centering of the pipe blanks

5 15 the joint is controlled using templates, and then a welding machine (not shown) is installed on it and the welding process is started.

The optimum angle of inclination of the grooves 12 and 13 relative to the rods was determined experimentally, for which pipes with a diameter of 100 mm were joined using this device. In this case, a flexible endless element was used in the form of a cable with a diameter of 4 mm and comb of prisms with different angles of inclination. After each

5, the joins were measured using templates and other tools. It is established that if this angle is less than 5 °, then a force arises that does not provide

0

automatic longitudinal movement of the pipe, and if this angle is greater than 8 °, the flexible element will jam in the groove and the pipes will not be clamped in the device. The experimental results are shown in the table.

The angle of inclination, groove, hail

Docking Quality

Invalid joint clearance

 Satisfactory, since the longitudinal component F, equal to 8% of the total clamping force F, is sufficient to bring the assembled pipes closer to contact between them, i.e. clearance is excluded.

-8

Cable jamming in comb grooves, lack of centering.

The use of the device makes it possible to significantly improve the quality of welding, especially for steels that are prone to crack formation, as it eliminates tacking and also provides assembly for welding of pipes of thin-walled and soft materials, for example, aluminum and its alloys or plastics.

0

0

Claims (3)

The claims I. A device for assembling and centering pipes for welding, comprising a housing with two support prisms symmetrically mounted thereon, a tension mechanism and a flexible centering element in the form of a cable loop fixed to one side of the housing and connected to a tension mechanism located with on the other hand, characterized in that, in order to improve the quality of the assembly by tightening the pipes simultaneously with their centering, the tension mechanism is made in the form of two movable and two fixed pairs 5 rollers, movable rollers mounted on the housing with the ability to move in mutually opposite directions perpendicular to the axis of symmetry, each pair of fixed rollers is mounted on the housing at the corresponding supporting prism, the axis of the rollers - pairs are placed on a straight, perpendicular working surface of this supporting prism the prisms are made in the form of combs with two grooves inclined at an angle of 5-8 ° to the axis of symmetry of the body in the direction from the specified axis, the loop of the cable is double, each branch is passed through with The corresponding groove of the comb, the inner branches cover the fixed roller closest to the prism, and both branches 0 loops together encompass the second fixed rollers of each pair and the movable rollers. 2. The device according to claim I, characterized in that it is equipped with a tension screw with sections on which the right and left threads are respectively made, two nuts installed on sections of the screw, the housing is made hollow with slots on the side surface, screw housed inside the housing, and movable rollers mounted externally and connected to nuts through slots. 3. The device according to claim 1, characterized in that the hinges are fixed with one or at least two hooks located at different distances from the working surface of the prisms. 5 /5 8 7 S S 7 7 g I A / / / fie. J / " 5 B Suds fPaS. fz f: