CN214053219U - Bending equipment for welded steel pipe - Google Patents

Abstract

A bending device for welding steel pipes comprises a retainer, a first rotating shaft, a second rotating shaft, a first sleeve ring, a first supporting plate, a screw, a rotary table, a second supporting plate and a second sleeve ring; an upper press roller is arranged on the first rotating shaft; a lower press roller is arranged on the second rotating shaft; the first sleeve ring is sleeved on the first rotating shaft, and a first connecting rod is arranged on the outer wall of the first sleeve ring; the first supporting plate is arranged at the tops of the two groups of holding frames; the screw is matched with the threaded hole, and the bottom of the screw is connected with the turntable; the bottom of the second supporting plate is connected with the top of the first connecting rod; the two groups of second lantern rings are sleeved on the second rotating shaft, and second connecting rods are arranged on the outer walls of the two groups of second lantern rings. The utility model discloses in, go up the compression roller and relative fixed down between the compression roller, guaranteed the quality of bending, and can the synchronous adjustment go up the compression roller and the height of compression roller down, ensure the straightness accuracy that the steel sheet was bent, can be applicable to the steel sheet bending of different thickness simultaneously, application scope is wide.

Description

Bending equipment for welded steel pipe

Technical Field

The utility model relates to a welding steel pipe production facility technical field especially relates to a equipment of bending of welding steel pipe.

Background

The welded steel pipe is a steel pipe which is formed by bending and deforming a steel belt or a steel plate into a round shape, a square shape and the like and then welding, the surface of the welded steel pipe is provided with a seam, the welded steel pipe has lower cost and higher production efficiency than a seamless steel pipe, and the adopted blank is the steel plate or the steel belt. In the press roller group in the prior art, the distance between the upper press roller and the lower press roller can be adjusted only by adjusting the upper press roller, and if the central points of the steel strip which is bent and formed by a plurality of groups of press roller groups are not on the same straight line in the gradual bending process of the steel strip, the whole bent steel strip is bent in the conveying process, so that the whole straightness of the processed steel tube is poor, and the quality of the steel tube is influenced; simultaneously, the upper and lower compression rollers are fixed through the two retainers, the two ends of the upper and lower compression rollers are respectively connected onto the two retainers, and when the adjustment is carried out, the positions of the two upper compression rollers on the retainers are respectively adjusted to realize the adjustment of the distance, so that after the adjustment of the upper compression rollers, the two ends of the compression roller shaft are highly deviated, the two sides of the steel belt are unevenly stressed, and the quality of the steel pipe is caused to be in a problem.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

For solving the technical problem that exists among the background art, the utility model provides a equipment of bending of welding steel pipe goes up the compression roller and relatively fixed down between the compression roller, has guaranteed the quality of bending, and can the synchronous adjustment go up the height of compression roller and compression roller down, ensures the straightness accuracy that the steel sheet was bent, can be applicable to the steel sheet bending of different thickness simultaneously, and application scope is wide.

(II) technical scheme

The utility model provides a bending device for welded steel pipes, which comprises a retainer, a first slider, a second slider, a first rotating shaft, a second rotating shaft, a first spacing ring, a first sleeve ring, a first supporting plate, a screw, a rotary disc, a second supporting plate, a second spacing ring and a second sleeve ring;

the holders are vertically arranged, the holders are provided with two groups which are parallel to each other, the two groups of holders are provided with vertical first strip-shaped grooves, the two groups of first strip-shaped grooves respectively form openings on the opposite end surfaces of the two groups of holders, the two groups of holders are provided with horizontal second strip-shaped grooves, the second strip-shaped grooves are communicated with the first strip-shaped grooves, and the second strip-shaped grooves form openings on the rear end surfaces of the holders; the first sliding blocks are positioned in the first strip-shaped grooves and are in sliding connection with the walls of the first strip-shaped grooves, the sliding direction is vertical, the two groups of first sliding blocks are arranged, and the two groups of first sliding blocks correspond to the two groups of first strip-shaped grooves one by one; the second sliding blocks are positioned in the first strip-shaped grooves, the second sliding blocks are positioned below the first sliding blocks, the second sliding blocks are in sliding connection with the groove walls of the first strip-shaped grooves, the second sliding blocks are arranged in two groups, and the two groups of second sliding blocks correspond to the two groups of first strip-shaped grooves one by one; two ends of a first rotating shaft are respectively inserted into the two groups of first bar-shaped grooves and are rotationally connected with the two groups of first sliding blocks, and an upper press roller is arranged on the first rotating shaft; two ends of a second rotating shaft are respectively inserted into the two groups of first strip-shaped grooves and are rotationally connected with the two groups of second sliding blocks, a lower press roller is arranged on the second rotating shaft, and the arc surface of the lower press roller is matched with the arc surface of the upper press roller; the first limiting rings are arranged on the first rotating shaft, and the first limiting rings are arranged in two groups, and the two groups of the first limiting rings are symmetrical about the upper press roll; the first lantern ring is sleeved on the first rotating shaft, the inner peripheral surface of the first lantern ring is attached to the outer peripheral surface of the first rotating shaft, the first lantern ring is provided with two groups, the two groups of first lantern rings are positioned at the outer sides of the two groups of first limiting rings, the two groups of first lantern rings are symmetrical about the upper pressing roller, and vertical first connecting rods are arranged on the outer walls of the two groups of first lantern rings; the first supporting plate is horizontally arranged at the tops of the two groups of holders, and vertical threaded holes are formed in the first supporting plate; the screw rod is matched with the threaded hole, the top of the screw rod is provided with a knob, and the bottom of the screw rod penetrates through the threaded hole to extend into the lower part of the first supporting plate and is connected with the rotary table; the turntable is rotationally arranged on a second support plate, the second support plate is horizontally and slidably arranged on the two groups of holders, the sliding direction of the second support plate is the vertical direction, and the bottom of the second support plate is connected with the tops of the two groups of first connecting rods; the second limiting rings are arranged on the second rotating shaft, and the second limiting rings are arranged in two groups, and the two groups of second limiting rings are symmetrical relative to the lower pressing roller; the second lantern ring is in fit with the second rotating shaft in a sleeved mode, the second lantern ring is provided with two groups, the two groups of second lantern rings are located on the outer sides of the two groups of second limiting rings, vertical second connecting rods are arranged on the outer walls of the two groups of second lantern rings, and the tops of the two groups of second connecting rods are provided with sleeving assemblies sleeved on the first rotating shaft.

Preferably, a plurality of groups of vertical limiting holes are formed in the first supporting plate, a plurality of groups of vertical limiting rods are arranged on the second supporting plate, the tops of the limiting rods are matched with each other to penetrate through the limiting holes to extend into the upper portion of the first supporting plate, and the plurality of groups of limiting rods correspond to the plurality of groups of limiting holes one to one.

Preferably, the sleeving component comprises a first U-shaped block, a second U-shaped block, a bolt and a nut; the first U-shaped block is arranged at the top of the second connecting rod, and a U-shaped groove of the first U-shaped block faces upwards; the second U-shaped block is rotatably connected with the first U-shaped block, the second U-shaped block and the first U-shaped block are in a closed state, a circular groove is formed between the second U-shaped block and the U-shaped groove of the first U-shaped block, the outer peripheral wall of the first rotating shaft is attached to the inner peripheral wall of the circular groove, vertically opposite through holes are formed in the second U-shaped block and the first U-shaped block, the bolt penetrates through the through holes, the nut is matched with the bolt, and the nut is attached to the bottom of the first U-shaped block.

Preferably, set up the supporting shoe on the first U type piece, set up two sets of vertical and third backup pads that are parallel to each other on the supporting shoe, set up the horizontally pole between two sets of third backup pads, the pole axis is parallel with second U type piece length direction, sets up the fourth backup pad on the second U type piece, and the fourth backup pad rotates with the pole to be connected, and the direction of rotation is clockwise and anticlockwise.

Preferably, the periphery of the knob is provided with an anti-slip silica gel layer.

Preferably, a storage box is arranged between the two groups of holding frames.

The above technical scheme of the utility model has following profitable technological effect: the knob is rotated to drive the upper compression roller to integrally move up and down, so that the upper compression roller cannot deflect in the height adjusting process, the cambered surfaces of the lower compression roller and the upper compression roller are completely matched, the problem of inconsistent bending degrees of two sides cannot occur, the bending quality is ensured, meanwhile, the knob is rotated to synchronously adjust the positions of the upper compression roller and the lower compression roller, the bending height is convenient to adjust, the steel plate is prevented from being bent in the length direction in the bending process, and the integral straightness of bending is ensured; when the steel plates with different thicknesses need to be bent, the second connecting rods with different lengths can be replaced to be suitable.

Drawings

Fig. 1 is the utility model provides a structural schematic of the equipment of bending of welding steel pipe.

Fig. 2 is the utility model provides a structural schematic of the cover subassembly in the equipment of bending of welding steel pipe.

Reference numerals: 1. a holder; 2. a first bar-shaped groove; 3. a second strip groove; 4. a first slider; 5. a second slider; 6. a first rotating shaft; 7. a second rotating shaft; 8. an upper compression roller; 9. a lower pressing roller; 10. a first limit ring; 11. a first collar; 12. a first link; 13. a first support plate; 14. a threaded hole; 15. a screw; 16. a knob; 17. a turntable; 18. a second support plate; 19. a limiting rod; 20. a limiting hole; 21. a second stop collar; 22. a second collar; 23. a second link; 24. a first U-shaped block; 25. a second U-shaped block; 26. a through hole; 27. a bolt; 28. a nut; 29. a support block; 30. a third support plate; 31. a round bar; 32. a fourth support plate; 33. a storage box.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1-2, the utility model provides a bending apparatus for welded steel pipes, which comprises a holder 1, a first slider 4, a second slider 5, a first rotating shaft 6, a second rotating shaft 7, a first limit ring 10, a first collar 11, a first supporting plate 13, a screw 15, a rotating disc 17, a second supporting plate 18, a second limit ring 21 and a second collar 22;

the retainer 1 is vertically arranged, the retainer 1 is provided with two groups which are parallel to each other, the two groups of retainers 1 are respectively provided with a vertical first strip-shaped groove 2, the two groups of first strip-shaped grooves 2 respectively form openings on the opposite end surfaces of the two groups of retainers 1, the two groups of retainers 1 are provided with a horizontal second strip-shaped groove 3, the second strip-shaped groove 3 is communicated with the first strip-shaped groove 2, and the second strip-shaped groove 3 forms an opening on the end surface at the rear side of the retainer 1; the first sliding blocks 4 are positioned in the first strip-shaped grooves 2, the first sliding blocks 4 are in sliding connection with the groove walls of the first strip-shaped grooves 2, the sliding direction is the up-down direction, the first sliding blocks 4 are arranged in two groups, and the two groups of first sliding blocks 4 correspond to the two groups of first strip-shaped grooves 2 one by one; the second sliding blocks 5 are positioned in the first strip-shaped grooves 2, the second sliding blocks 5 are positioned below the first sliding blocks 4, the second sliding blocks 5 are in sliding connection with the groove walls of the first strip-shaped grooves 2, the second sliding blocks 5 are provided in two groups, and the two groups of second sliding blocks 5 correspond to the two groups of first strip-shaped grooves 2 one by one; two ends of a first rotating shaft 6 are respectively inserted into the two groups of first strip-shaped grooves 2 and are rotationally connected with the two groups of first sliding blocks 4, and an upper press roller 8 is arranged on the first rotating shaft 6; two ends of a second rotating shaft 7 are respectively inserted into the two groups of first strip-shaped grooves 2 and are rotationally connected with the two groups of second sliding blocks 5, a lower pressure roller 9 is arranged on the second rotating shaft 7, and the arc surface of the lower pressure roller 9 is matched with the arc surface of the upper pressure roller 8; the first limiting rings 10 are arranged on the first rotating shaft 6, the first limiting rings 10 are arranged in two groups, and the two groups of the first limiting rings 10 are symmetrical relative to the upper press roll 8; the first lantern rings 11 are sleeved on the first rotating shaft 6, the inner peripheral surfaces of the first lantern rings 11 are attached to the outer peripheral surfaces of the first rotating shaft 6, the first lantern rings 11 are arranged in two groups, the two groups of first lantern rings 11 are located on the outer sides of the two groups of first limiting rings 10, the two groups of first lantern rings 11 are symmetrical about the upper pressing roller 8, and vertical first connecting rods 12 are arranged on the outer walls of the two groups of first lantern rings 11; the first supporting plate 13 is horizontally arranged at the top of the two groups of holders 1, and vertical threaded holes 14 are formed in the first supporting plate 13; the screw 15 is matched with the threaded hole 14, the top of the screw 15 is provided with a knob 16, and the bottom of the screw 15 penetrates through the threaded hole 14 to extend into the lower part of the first supporting plate 13 and is connected with a rotary table 17; the rotary table 17 is rotationally arranged on the second support plate 18, the second support plate 18 is horizontally and slidably arranged on the two groups of holders 1, the sliding direction of the second support plate 18 is the vertical direction, and the bottom of the second support plate 18 is connected with the tops of the two groups of first connecting rods 12; the second limiting rings 21 are arranged on the second rotating shaft 7, two groups of the second limiting rings 21 are arranged, and the two groups of the second limiting rings 21 are symmetrical relative to the lower pressing roller 9; the second lantern ring 22 is fitted on the second rotating shaft 7, the second lantern ring 22 is provided with two sets, the two sets of second lantern rings 22 are located on the outer sides of the two sets of second limiting rings 21, vertical second connecting rods 23 are arranged on the outer walls of the two sets of second lantern rings 22, and the tops of the two sets of second connecting rods 23 are provided with sleeving components sleeved on the first rotating shaft 6.

The utility model discloses in, the knob 16 that rotates drives the screw rod 15 and rotates, through carousel 17, second backup pad 18, first connecting rod 12, first lantern ring 11 and first pivot 6 drive the whole reciprocating of compression roller 8, make upper compression roller 8 can not deflect in the height-adjusting process, and second lantern ring 22, second connecting rod 23 and the component of cup jointing constitute coupling mechanism, coupling mechanism fixes second pivot 7 on first pivot 6, make the cambered surface identical completely between lower compression roller 9 and the upper compression roller 8, can not take place the inconsistent problem of both sides bending degree, the quality of bending has been guaranteed, rotatory knob 16 simultaneously can carry out the synchro-control to the position of upper compression roller 8 and lower compression roller 9 simultaneously, be convenient for adjust the height of bending, prevent that the steel sheet from taking place the bending in the bending process in length direction, the whole straightness accuracy of bending has been guaranteed; when steel plates with different thicknesses need to be bent, the sleeving assembly is detached from the first rotating shaft 6, the lower sliding press roller 9 enables the two groups of second sliding blocks 5 to be separated from the first strip-shaped groove 2 and then pulled out from the second strip-shaped groove 3, and connecting mechanisms with different sizes are replaced, wherein the only difference of the connecting mechanisms with different sizes is that the length of the second connecting rod 23 is different, a suitable connecting mechanism is selected, the second sleeving ring 22 is sleeved on the second rotating shaft 7, the second sliding blocks 5 slide into the first strip-shaped groove 2 from the second strip-shaped groove 3 again, the sleeving assemblies in the two groups of connecting mechanisms are installed on the first rotating shaft 6, and the steel plates with different thicknesses can be bent by changing the length of the second connecting rod 23. The utility model discloses in, go up compression roller 8 and relative fixed down between the compression roller 9, guaranteed the quality of bending, and can synchronous adjustment go up compression roller 8 and the height of compression roller 9 down, ensure the straightness accuracy that the steel sheet was bent, can be applicable to the steel sheet bending of different thickness simultaneously, application scope is wide.

In an optional embodiment, a plurality of groups of vertical limiting holes 20 are formed in the first supporting plate 13, a plurality of groups of vertical limiting rods 19 are arranged on the second supporting plate 18, the tops of the limiting rods 19 penetrate through the limiting holes 20 in a matched mode and extend into the upper portion of the first supporting plate 13, and the plurality of groups of limiting rods 19 correspond to the plurality of groups of limiting holes 20 one by one; the stability of the second supporting plate 18 in the up-and-down moving process is improved, and the second supporting plate 18 is further ensured to be in a horizontal state all the time.

In an alternative embodiment, the socket assembly comprises a first U-shaped block 24, a second U-shaped block 25, a bolt 27 and a nut 28; the first U-shaped block 24 is arranged at the top of the second connecting rod 23, and the U-shaped groove of the first U-shaped block 24 faces upwards; the second U-shaped block 25 is rotatably connected with the first U-shaped block 24, the second U-shaped block 25 and the first U-shaped block 24 are in a closed state, a circular groove is formed by the second U-shaped block 25 and the U-shaped groove of the first U-shaped block 24, the outer peripheral wall of the first rotating shaft 6 is attached to the inner peripheral wall of the circular groove, vertically opposite through holes 26 are formed in the second U-shaped block 25 and the first U-shaped block 24, a bolt 27 penetrates through the through holes 26, a nut 28 is matched with the bolt 27, and the nut 28 is attached to the bottom of the first U-shaped block 24; the U-shaped grooves of the second U-shaped block 25 and the first U-shaped block 24 are sleeved on the first rotating shaft 6, and then the bolts 27 are inserted and fixed through nuts 28.

In an alternative embodiment, a supporting block 29 is arranged on the first U-shaped block 24, two groups of vertical and mutually parallel third supporting plates 30 are arranged on the supporting block 29, a horizontal round rod 31 is arranged between the two groups of third supporting plates 30, the axis of the round rod 31 is parallel to the length direction of the second U-shaped block 25, a fourth supporting plate 32 is arranged on the second U-shaped block 25, and the fourth supporting plate 32 is rotatably connected with the round rod 31 in the clockwise and anticlockwise directions; simple structure, the installation and the dismantlement of the subassembly of being convenient for cup jointing.

In an alternative embodiment, the knob 16 is provided with an anti-slip silica gel layer on the periphery; rotation of the knob 16 is facilitated.

In an alternative embodiment, a storage box 33 is arranged between the two groups of holders 1; the connecting mechanisms with different sizes can be conveniently placed.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (6)

1. The bending equipment for the welded steel pipe is characterized by comprising a retainer (1), a first sliding block (4), a second sliding block (5), a first rotating shaft (6), a second rotating shaft (7), a first limiting ring (10), a first sleeve ring (11), a first supporting plate (13), a screw (15), a rotary table (17), a second supporting plate (18), a second limiting ring (21) and a second sleeve ring (22);

the retainer (1) is vertically arranged, the retainer (1) is provided with two groups which are parallel to each other, the two groups of retainers (1) are provided with vertical first strip-shaped grooves (2), the two groups of first strip-shaped grooves (2) respectively form openings on the opposite end surfaces of the two groups of retainers (1), the two groups of retainers (1) are provided with horizontal second strip-shaped grooves (3), the second strip-shaped grooves (3) are communicated with the first strip-shaped grooves (2), and the second strip-shaped grooves (3) form openings on the end surfaces of the rear sides of the retainers (1); the first sliding blocks (4) are positioned in the first strip-shaped grooves (2), the first sliding blocks (4) are in sliding connection with the groove walls of the first strip-shaped grooves (2), the sliding direction is vertical, the first sliding blocks (4) are arranged in two groups, and the two groups of first sliding blocks (4) correspond to the two groups of first strip-shaped grooves (2) one by one; the second sliding blocks (5) are positioned in the first strip-shaped grooves (2), the second sliding blocks (5) are positioned below the first sliding blocks (4), the second sliding blocks (5) are in sliding connection with the groove walls of the first strip-shaped grooves (2), the second sliding blocks (5) are arranged in two groups, and the two groups of second sliding blocks (5) correspond to the two groups of first strip-shaped grooves (2) one by one; two ends of a first rotating shaft (6) are respectively inserted into the two groups of first bar-shaped grooves (2) and are rotationally connected with the two groups of first sliding blocks (4), and an upper press roller (8) is arranged on the first rotating shaft (6); two ends of a second rotating shaft (7) are respectively inserted into the two groups of first bar-shaped grooves (2) and are rotationally connected with the two groups of second sliding blocks (5), a lower pressure roller (9) is arranged on the second rotating shaft (7), and the arc surface of the lower pressure roller (9) is matched with the arc surface of the upper pressure roller (8); the first limiting rings (10) are arranged on the first rotating shaft (6), the first limiting rings (10) are arranged in two groups, and the two groups of first limiting rings (10) are symmetrical about the upper pressing roller (8); the first lantern rings (11) are sleeved on the first rotating shaft (6), the inner circumferential surfaces of the first lantern rings (11) are attached to the outer circumferential surface of the first rotating shaft (6), the first lantern rings (11) are arranged in two groups, the two groups of first lantern rings (11) are positioned on the outer sides of the two groups of first limiting rings (10), the two groups of first lantern rings (11) are symmetrical about the upper pressing roller (8), and vertical first connecting rods (12) are arranged on the outer walls of the two groups of first lantern rings (11); the first supporting plate (13) is horizontally arranged at the tops of the two groups of holders (1), and vertical threaded holes (14) are formed in the first supporting plate (13); the screw rod (15) is matched with the threaded hole (14), the top of the screw rod (15) is provided with a knob (16), and the bottom of the screw rod (15) penetrates through the threaded hole (14) to extend into the lower part of the first supporting plate (13) and is connected with the rotary table (17); the rotary table (17) is rotatably arranged on the second supporting plate (18), the second supporting plate (18) is horizontally and slidably arranged on the two groups of holding frames (1), the sliding direction of the second supporting plate (18) is vertical, and the bottom of the second supporting plate (18) is connected with the tops of the two groups of first connecting rods (12); the second limiting rings (21) are arranged on the second rotating shaft (7), two groups of second limiting rings (21) are arranged, and the two groups of second limiting rings (21) are symmetrical about the lower pressing roller (9); the second lantern ring (22) is sleeved on the second rotating shaft (7) in a matched mode, the second lantern ring (22) is arranged in two groups, the two groups of second lantern rings (22) are located on the outer sides of the two groups of second limiting rings (21), vertical second connecting rods (23) are arranged on the outer walls of the two groups of second lantern rings (22), and the tops of the two groups of second connecting rods (23) are all provided with sleeving components sleeved on the first rotating shaft (6).

2. The bending apparatus according to claim 1, wherein the first support plate (13) is provided with a plurality of sets of vertical limiting holes (20), the second support plate (18) is provided with a plurality of sets of vertical limiting rods (19), the tops of the limiting rods (19) penetrate through the limiting holes (20) and extend into the upper portion of the first support plate (13), and the plurality of sets of limiting rods (19) correspond to the plurality of sets of limiting holes (20) one to one.

3. The apparatus for press bending welded steel pipes according to claim 1, wherein the socket assembly comprises a first U-shaped block (24), a second U-shaped block (25), a bolt (27) and a nut (28); the first U-shaped block (24) is arranged at the top of the second connecting rod (23), and a U-shaped groove of the first U-shaped block (24) faces upwards; second U type piece (25) and first U type piece (24) are rotated and are connected, second U type piece (25) and first U type piece (24) are in under the closed condition, second U type piece (25) and the U-shaped groove of first U type piece (24) form the circular slot, first pivot (6) periphery wall and the laminating of circular slot internal perisporium, set up vertical relative through-hole (26) on second U type piece (25) and first U type piece (24), bolt (27) pass through-hole (26), nut (28) and bolt (27) cooperation, nut (28) and the laminating of first U type piece (24) bottom.

4. The equipment for bending the welded steel pipe according to claim 3, wherein a supporting block (29) is arranged on the first U-shaped block (24), two groups of vertical third supporting plates (30) which are parallel to each other are arranged on the supporting block (29), a horizontal round rod (31) is arranged between the two groups of third supporting plates (30), the axis of the round rod (31) is parallel to the length direction of the second U-shaped block (25), a fourth supporting plate (32) is arranged on the second U-shaped block (25), and the fourth supporting plate (32) is rotatably connected with the round rod (31) in a clockwise and anticlockwise rotating direction.

5. The equipment for press bending welded steel pipes according to claim 1, wherein the knob (16) is provided with an anti-slip silicone layer on its outer periphery.

6. The apparatus for press bending welded steel pipes according to claim 1, wherein a storage box (33) is provided between the two sets of holders (1).

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