BRPI0802712A2 - movable sheet metal helix factory - Google Patents

Abstract

MOBILE PLATE FACTORY FACTORY. The present summary relates to a sheet metal helical tube mill patent which belongs to the field of sheet metal tube manufacturing means, which was developed to facilitate all the logistics of supplying this type of tube in one site. , as well as providing parts obtained from the pipe, particularly piles, of simpler and better construction than usual; said factory composed by: unwinder (10); traction assembly (30); press (50); side guide rollers (70); calender (90); welding machine assembly (110); tube support bed (130); means of supplying electric power (150); and others necessary for the manufacture of sheet steel tube, is movable and mounted on a low trailer (200) of a movable mechanical horse assembly (220) and trailer (200), such that said movable factory can move up to the construction site where the pipe (300) will be used and fabricate it "on site" and directly to the specified length without the need for splicing.

Description

PI0802712 -9

"MOBILE PIPE MOBILE FACTORY"

This descriptive report relates to a patent for a mobile sheet metal tube mill, which belongs to the field of sheet metal tube manufacturing means and has been developed to facilitate all the logistics of supplying this type of tube to a site, as well as endowing the parts obtained from the pipe, such as; Underwater piles, Pipelines, Pipelines for the transportation of chemicals and ores and others used for the most diverse applications, simpler and better than conventional construction.

Rectilinear cylindrical tubes made of sheet metal tape, calendered in the helical form are already known whose adjacent edges of the turns are connected by continuous helical welding. In one possibility, this sheet metal tube is applied to pile foundation. This tube is commonly referred to as the Helical Plate Tube, a nomenclature adopted in this report.

Normally, these tubes are manufactured in factories composed essentially of: by unwinding of the sheet metal coil; by traction unit, which advances the tape longitudinally; calender, which conforms the ribbon to the helical shape; by welding machine, it welds the adjacent edges of the turns of the helix bent sheet, progressively forming the tube; by a roller track, to support and advance the tube as it is manufactured, among others. These manufacturing units are usually stationary and away from the site where the pipe is used. This requires a pipe transport operation between the manufacturing site and the work.

Although the usual stationary fabrication units of this tube have no technical limitations to produce it at long lengths, this tube has to be manufactured with relatively short length, typically about twelve meters, to meet transport limitations between the factory and the site. Although the pipes are relatively short, twelve meters, this transport between the factory and the site can be relatively complex, especially depending on the conditions of the route.

On the other hand, for transportation to be cost effective, there is a need to transport several pipes at a time, which can also be a complication.

Often, its application is longer than the conventional pipe, which requires welding as many pipes as necessary to compose the length of the pieces. This results in additional "in-place" welding operation (s), which may be undesirable and costly.

Due to the above aspects, new alternatives to sheet metal helical pipe and / or the fabrication process thereof and / or to transport it between the factory and the work site are desirable.

Thus, the aim of the present invention is to provide a means of fabricating sheet metal helical tubes which overcomes the above and other drawbacks with the usual ones.

Another goal is to provide a means of fabrication that overcomes the above problems, whether by construction or manufacturing or operation with levels of complexity that make it uninteresting in the face of the usual.

Another objective is to provide a means of fabricating helical sheet metal so that better productivity results and adequate costs are obtained.

Another object is to provide a sheet helical tube obtained from said manufacturing means of the present invention, which has advantages over similar tubes obtained by the usual fabrication means.

In view, therefore, of the above problems and in order to overcome them and in order to meet the related objectives, the mobile sheet metal helical pipe mill, object of the present invention patent, has been developed, which is understood as follows: essentially: by unwinder; per traction unit; by splicing press; by calender, by welding machines; per roller track; per generator set and all other equipment necessary for the manufacture of sheet metal helical tube, mounted on a low trailer with lateral, rear and upper closures, between which the sides are articulated and move between vertical positions, when acting as closures properly. said and horizontal position, when acting as a catwalk near the manufacturing equipment; Said trailer is pulled by mechanical horse equipped with crane, material handling and others. Said factory is also formed by auxiliary truck for the transport of demountable parts of the factory, tools, equipment and other necessary to manufacture the tube.

This arrangement of the screw-pipe mill is therefore mobile and fully self-sufficient thus overcoming the above problems as it can travel to the site and can manufacture the pipes to the required diameters and lengths "on site. ", avoiding the transportation of these between the place of manufacture and the work and all the problems resulting from that. Such a solution also relies on the fact that it is simpler and less costly to transport steel sheet coils to the job site than to transport pipes already manufactured.

Another significant advantage obtained with this factory concerns the fact that since the pipe is manufactured "on-site" and thus there is no need to transport it between the place of manufacture and the site, such pipe can be produced with the desired length for various applications, dispensing with the weld (s) operation (s) until the desired length is composed, as is usually the case, facilitating work on the construction site.

On the other hand, the fact that the pipe can be produced directly to the desired length simplifies its manufacture and improves its constitution, since it will not have connection welds, as usually occurs.

The accompanying drawings refer to the movable helical sheet metal mill, object of the present patent, in which:

fig. 1 shows a schematic overview of the factory laterally;

fig. 2 shows a section of steel sheet helical tube manufactured by the mobile factory;

fig. 2A-A shows a section indicated in the previous figure;

fig. Figure 3 shows a detail of the factory, in which the unwinding unwinder is received and from which a reel of steel strip is unwound, from which the tube seen in the previous figure is obtained;

fig. Fig. 4 shows a detail of the factory, in which a pull-up assembly of the sheet steel strip is seen pulling it from the unwinder; 5 shows a detail of the factory, in which a press used for securing ends of sheet steel bands in splicing operations is seen;

fig. 6 shows a detail of the factory in which rollers for alignment of the side edges of the steel plate are seen;

fig. 7 shows a detail of the factory, in which a detail of the sheet steel forming bend is seen, in which the sheet steel bending rollers are seen;

fig. 8 shows a detail of the calender, in which a detail of the steel plate containment roller assembly and maintenance of the outside diameter of the all is seen;

fig. 9 shows a detail of the calender in which a set of internal support rollers is seen;

fig. 10 shows a detail of the calender in which a set of maintenance rollers of the abutting steel sheet edges is seen;

fig. 11 shows a detail of the factory, in which schematically seen the welding machines working next to the calender;

fig. 12 shows a detail of the factory, in which an excerpt of the support roll bed and tube advance is seen as it is manufactured;

the fig. 13 shows a side view of the factory, having the low trailer on which the equipment is mounted, with the side locks in the closed position, suitable for moving the factory to a place of operation;

fig. 13 A shows the factory closed from the rear;

fig. 13B shows the same view as above, but with the factory in position with the side closures in the open position, in which the side closures form walkways suitable for the operation of the factory on the construction site; and

fig. 14 shows a pile made from the pipe manufactured by the present mobile factory.

According to the above related illustrations, factory 1 (fig. 1), object of the present invention, is for the manufacture of sheet metal helical tube 300 (fig. 2, 2A), comprising essentially: a helically shaped calendered sheet steel strip 301; and by helical weld line 302, which connects the adjacent edges of the turns formed by the folded steel sheet tape, forming the tube.

Thus, the present factory 1 is comprised essentially (fig. 1) of: by unwinding 10 of the steel strip tape reel, by traction assembly 30 which longitudinally advances the tape; by press50 for adjusting steel sheet tips and welding in e-mending operations; by side guide rollers 70 for aligning the edges of the steel plate; by calender 90, which conforms the ribbon to the helical shape; together with welding machines 110, which welds the adjacent edges of the helix-bent steel sheet turns, gradually forming the tube; roller bed 130 (figs. 7 and 12) for supporting and advancing the tube as it is manufactured; through electricity supply 150 and others.

In the present invention, and this constitutes the main object of the patent, said factory, comprising: unwinder 10; tensile assembly 30; by press 50; by side guide rollers 70; by calan-dra 90; per set of welding machine 110; per roller bed 130; through electricity supply 150; and for all other equipment required for the manufacture of sheet steel coil, it is movable and for such a factory is mounted on a low trailer 200 (fig. 1) of a movable assembly (fig. 13) of mechanical horse 220 and trailer 200, such a mobile factory may travel to the construction site where pipe 300 will be used and fabricated "on-site" and directly to the specified length without the need for splicing.

In detail, the unwinder 10 is disposed in the lower carriage 200 and (Fig. 3) comprises essentially: two aligned hubs 11 which engage at respective ends of the opening of a steel sheet coil 301; by two movable towers 12 at the upper ends of which the hubs are mounted; On base 13 the towers are mounted there. and by a hydraulic system comprised of hydraulic cylinders 14 which hold the towers, said base has guide system in the direction of transverse to the unwinding that allows the towers to move in the direction of approach or retraction for mounting and adjustment to the width of the coil and to arrange They are adjacent to each other when the plant is in disuse and should move from one location to another and guide the longitudinal direction of unwinding for adjustments.

The traction assembly 30 is arranged in a low drawer region 200 following that containing the unwinder 10 and is formed by two equal compact traction units 31 (fig. 1) arranged one after the other. Each compact traction unit 31 (fig. 4) consists essentially of: four axes, an upper axle pair 32 and a lower axle pair 32 'tangent to those between which the steel strip tape passes and is pulled. 301. Axes 32, 32 'are subject to gearbox with four synchronized outputs. Shaft drive motors are synchronized by clutches. The positioning of the axes in relation to the plate is done by means of a hydraulic mechanism. In the section of the low trailer 200 between the traction units 31, the press 50 for adjusting the steel plate tips 301 and welding in the splicing operations, comprising essentially ( Fig. 5): by frame 51; by table 52 arranged under the plate; and by pressure-hammer 53 mounted on the frame and subject to hydraulic mechanism. The welding equipment for soldering the tips can be portable desoldering equipment (not shown).

The side guide rollers 70 for aligning the steel plate edges are comprised essentially (fig. 6): of rollers 71 which lie against respective edges of the steel plate 301; by bases72 which have the rollers mounted and mounted on the frame of one of the compact traction units 31.

The calender 90 and the welding machine 110 form an assembly which is mounted on a portion of the low trailer 200 following the traction assembly 30. The calender 90 is comprised essentially (figs. 7 to 10): plate; by set of rollers 92 containing the bent sheet and maintaining the outer diameter of the tube; per tube inner bearing roll assembly 93; and retaining roller assembly 94 from the side edges of the plate.

The plate bending roller assembly 91 is comprised essentially (figs. 1,7): of two adjacent overlapping roller alignments, through which plate 301 passes and is bent, disposed at an angle to the geometric axis of the plate. come the traction assembly 30: a base-mounted bottom-bend roller alignment 91 'low-floor trolley-mounted 200, and a 91-inch top-bend roller alignment mounted on a movable arm 95 one end of which is free swing and in of the initial portion of the forming tube and the opposite end is mounted on a hydraulic cylinder96 external to the inlet of the forming tube which compresses the rollers against the plate which is pressed against the lower rollers 91 '; said hydraulic cylinder 96 is mounted on 96 'frame that is mounted on the low floor 200. The bend rollers have independent adjustments.

The set of roll-retaining rollers 92 and maintaining the outer diameter of the tube are essentially (figs. 1, 8): rollers 92 'which are arranged against the outer surface of the folded plate at the initial moment of tube formation. ; adjustable bases 97, on which rollers 92 'are mounted; and by octagonal frame structure 97 ', which is arranged around the initial portion of the tube 300 to be formed, mounted on the floor of the low trailer 200 and on the inner face of which the adjustable bases 97 supporting the rollers 92' are mounted. The bent inner support roller assembly 93 is comprised essentially of: (fig. 9) rollers 93 'against the inner surface of the bent plate in the initial tube forming region, by adjustable base 98 supporting the rollers ; and by structure 98 'projected into the initial portion of the forming tube.

The backing roll assembly 94 of the side edges of the sheet is comprised essentially (fig. 10): of roller 94 'which lies on outer regions adjacent the juxtaposed edges 301' of the folded sheet 301; per base 99 supporting the roller; and by frame 99 'which supports base 99.

The welding machine assembly 110 is comprised of two submerged arc release machines: a submerged arc welding machine 111 which makes continuous continuous helical welding for joining the adjacent edges of the steel sheet in the tube formation, which is left with its parts. act at the welding point, mounted on equipment structures outside the pipe and a 111 'submerged arc welding machine that makes continuous internal helical welding for bonding the adjacent edges of the plate, which has its parts acting at the welding point mounted on the arm. 95 of the calender 90, such that the outer welding machine 111 is ahead of the inner welding machine 111 'considering the direction of rotation of the steel plate to prevent the internal welding material from leaking out of the forming pipe.

Each external 111 and internal 111 'welding machine is formed essentially (fig. 11): by continuous current supply assembly 112 including enclosure housing the DC source, wiring connected to the electrical supply 150, electrode located at the soldering point and switched edging power supply derived from the source; by adding material wire feed assembly 113 including a wire-containing carriage, tensioning means for longitudinally displacing the wire, wire-directing means to the solder point; by granular cover material feed assembly 114 including hopper containing the hopper material, hopper-derived hoses that direct gravity hopper material to the weld points; and by reuse circuit 115 of the excess cover material.

Roller bed 130 for supporting and advancing tube 300 as it is manufactured has inlet end disposed at the outlet of calender assembly 90 and welding machine 110 (Figs. 7, 11) is substantially orthogonal to the position. low trailer 200, and supported on the floor; Said roller bed 130 is a demountable structure comprised essentially (fig.12): of a plurality of roller assemblies disposed at regular spaces under and along the tube, each assembly formed by rollers 131, directly supported by them. the tube; and base 132, on which the rollers rest and completing the roller bed 130 there is provided a detachable carrier structure 133, on which the bases 132 are mounted and which is supported on the floor. The roller bed 130 is a demountable part, not associated with the lower trailer 200, but mounted together to make the plant. The roller bed when disassembled is transported to the place of use by means of a transport auxiliary truck (not shown), which is also part of the factory assembly and which lends itself to transporting other components and tools that are part of the same.

The power supply means 150 (Figs. 1, 13) is a generator set that is mounted on the front of the low trailer 200 and sufficient to supply the power for the manufacturing process, preferably 180KVA.

Other components are part of the factory as: hydraulic system, pneumatic system, tools and others for the various purposes used in the manufacture of the tube, which are transported in the low cradle or in the mentioned auxiliary transport truck.

The low trailer 200 is of normal construction, that is, it is comprised essentially (figs. 1, 13): by platform, preferably of 3.00 mx 22.00 m, on which the equipment of the factory is mounted and supported on the chassis and this one on the undercarriage and front of said lower trailer 200 has a locking portion for engaging the mechanical carriage 220. In addition, the lower trailer 200 has closure formed essentially by: frame mounted on the platform; by hinged side closures 201, which can be moved between two positions: vertical position, in which they support the frame and act as closing walls and horizontal position, in which they rest on articulated arms 201 'side of the platform and act as walkways; by rear closure202, formed by a roll-up door that can be opened for mounting the rewinder to the rewinder; by upper closure 203 which may also be arranged above and on the sides of the side closures when in the position of the shutters to cover them.

The mechanical horse 220 is of normal construction, that is, it consists of a chassis supported on a tread, which supports the whole mechanism, the cab and at the rear of which the coupling part is provided to which the coupling part of the trailer is engaged. low 200; Said mechanical horse 220 is of a type which has mounted on the chassis behind the cab a crane (munck) 221, preferably for 43 t, for moving materials used by the factory, for example, moving the coils from which the pipes and other pipes are manufactured. .

Thus, the factory, consisting of the low trailer 200 having assembled the manufacturing equipment (unwinder 10; retraction assembly 30; press 50; side guide rollers 70; calender 90; welding machine assembly 110; electric power supply means 150 and others) engaged on the mechanical horse 220 and plus the auxiliary truck (s) carrying disassembled roller bed 130 and other equipment, tools, materials, among these 301 suitable sheet steel tape reels , and others, travel to the construction site.

At the jobsite, the factory is properly positioned and moved to the operating position, ie: The mechanical horse 220 disengages from the lower trailer 200. The trailer 200 has its side closures 201 open to the walkway position. (Fig. 13b) and rear closure 202 is also opened. The roller support belt 103 for the tube being manufactured is mounted near the outlet of the calender assembly 90 and welding machine 110. The mechanical horse 220, via its crane 221 and the open closing 202 of the trailer 200, carries a sheet coil 301 on the unwinder 10, on which it is mounted. From unwinder 10, the steel plate strip 301 is passed through the puller units 30, through the press 50 and its end fed between the bend rollers 91 of the calender 90. The pullers of the drive units 30 are pressed against the puller strip. 301. The calender90 rollers 91,92,93, 94 are adjusted to the diameter and pitch of the pipe 300 to be produced. The outer 111 and inner 111 welding machine assemblies are loaded with wire coils. filled and covered material. Generator group 150 is activated and starts to generate electrical energy necessary for the manufacture of the tube.

Thereafter, the plant is driven, whereby the traction units 30 begin to pull the sheet steel strip 301 and it moves forward and begins to pass and be helixed on the bend rollers 91 of the calender 90. The strip bent passes through rollers 92, which contain it in the outer diameter of the tube to be manufactured and also passes through the inner support rollers 93. From the formation of the first loop of the pipe 300, the adjacent edges of the folded tape are held together by roller 94. The outer 111 and inner welding machines 111 'start to weld the adjacent edges of the helix-shaped tape, producing a continuous helical weld line 302, made from the outside and inside. As the tube 300 is formed and extends from the calender 90, it is supported along the support bed 130 until it reaches the desired final length for the pipe or the pile formed therein, without the need for transverse splices, or that is, the pipe or pile is made in one piece with the required length of the work. At the end of the bent sheet coil, another coil is mounted on the unwinder 10 and with the aid of press 50, the ends of the steel strips 301 are clamped and welded for continuity of the process. The steel sheet coil 300 produced by the present factory can 600mm to 4,000mm in diameter and the coiled steel plate can be from # 4mm to 16mm (thickness).

The plant of the present invention can produce continuous tubes up to 200 m and has an average daily production (10h) of 801 (varying with pipe diameter and sheet thickness).

The steel sheet helical tube 300 produced is preferably used for composing applications which are above conventional lengths, which have a continuous single-piece body, that is, it is not formed by as many cross-linked sections of pipe as necessary to compose. the length of the stake as with conventional stationary manufacturing means. The pile made of a single sheet steel helical tube has one end provided with a crimping ring 303 (Fig. 14), which is connected to the pile end by transverse welding 303 '.

Within the basic construction described above, the mobile factory, object of the present patent, may present modifications regarding materials, dimensions, constructive details and / or functional and / or ornamental configuration, without departing from the scope of the requested protection.

Within this, the sheet metal helical tube produced by the present factory may have applications other than foundation piles, such as: Underwater Piles, Water Pipes; Pipelines for the transportation of chemicals and minerals and others.

Claims (16)

1. "MOBILE SHEET PIPE FACTORY" means said sheet helical tube (300), consisting essentially of: a helical-calendered sheet steel strip (301); and by a helical weld line (302), which connects the adjacent edges of the turns formed by the folded steel sheet fitment; said factory (1) comprising essentially: unwinder (10) of the steel sheet tape reel; by traction assembly (30), which longitudinally advances the tape; by press (50) for adjusting the steel sheet edges and welding in splicing operations; by side guide rollers (70) for aligning the edges of the steel plate; by calender (90), which conforms the ribbon to the helical shape; by machine assembly (110), which welds the adjacent edges of the turns of the helix-bent steel sheet, progressively forming the tube; by roller bed (130) for supporting and advancing the tube as it is manufactured; by means of electricity supply (150); and others, characterized by the fact that said plant comprises: the unwinder (10); spring set (30); press (50); side guide rollers (70); calender (90); welding machine assembly (110); means of supplying electric power (150); and others necessary for the manufacture of sheet steel helical tube, it is movable mounted on a low trailer (200) of a movable horse-mechanic assembly (220) and trailer (200), such that said movable factory can move to the construction site. where the pipe (300) will be used and fabricated "on-site" and directly to the specified length without the need for splicing and the roller bed (130) is a demountable structure that can be transported along with other equipment, tools and materials, by auxiliary trucks, which are also part of the factory; said roller bed (130) being mounted orthogonally next to the trailer (200) at the calender outlet (90). 2.) - "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that the unwinder (10) is disposed on the rear of the lower trailer (200) and is comprised essentially of two aligned hubs (11) which engage at respective ends of the opening of a steel sheet coil (301); by two movable towers (12) at the upper ends of which the hubs are mounted; base (13) on which the towers are mounted; and by hydraulic system comprised of hydraulic cylinders (14) that hold the towers, said base has guide system in the direction of transverse direction of unwinding that enables the streams to move in the direction of approach or retraction for assembly and adjustment to the width of the coil. and to be adjacent to each other when the factory is in disuse and must move from one location to another and guides in the longitudinal direction of unwinding for adjustment. 3.) - "MOBILE SHEET MOBILE FACTORY" as claimed in 1, characterized in that the drive assembly (30) is arranged in the region of the lower trailer (200) following that containing the unwinder (10) and It is formed by two equal compact traction units (31) arranged one after the other, each essentially consisting of four axes, an upper pair of axes (32) and a lower pair of axles (32) 'tangent to them, for example. between which passes and pulls the sheet steel strip (301); shafts (32), (32) 'are subject to four-synchronized gearbox; axle drive motors are synchronized by clutches; The positioning of the axes in relation to the plate is done through a hydraulic mechanism. 4. - "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that in the stretch of low trailer (200) between the traction units (31) the hydraulic press (50) is arranged to adjust the sheet steel tips (301) and welding in splicing operations. 5.- "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that the side guide rollers (70) for aligning the edges of the steel plate are essentially comprised of rollers (71) which lie against their edges the steel plate (301); by bases (72) which have the rollers mounted and mounted on the structure of one of the compact traction units (31). 6. "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that the calender (90) and the welding machine (110) form an assembly which is mounted on a portion of the lower trailer (200) following the traction (30); said calender (90) is comprised essentially of: plate bending roller assembly (91), bent plate retaining roller assembly (92) and maintaining the outer diameter of the tube; by set of rollers (93) of inner tube support; and by maintenance roller assembly (94) against the side edges of the plate. 7.) - "PLATE HELIC PIPE MOBILE FACTORY" as claimed in 6, characterized in that the sheet bending roller assembly (91) is comprised essentially of two adjacent overlapping roller alignments, between which it passes and the plate (301) is bent, arranged at an angle to the geometric axis of the plate from the drive assembly (30): a bottom-bend roller alignment (91) 'mounted on the base of the low trailer floor (200) and an alignment of upper bend rollers (91) "mounted to a movable arm (95) one end of which is free-swinging and within the starting portion of the forming tube and the opposite end is mounted to a hydraulic cylinder (96) external to the inlet of the forming pipe which compresses the rollers against the plate that is pressed against the lower rollers (91); said hydraulic cylinder (96) is mounted on a frame (96) which is mounted on the floor of the low trailer (200); the bending rollers have independent adjustments. 8.) - "MOBILE SHEET PIPE FACTORY" as claimed in 6, characterized in that the set of rollers (92) for holding the bent sheet and maintaining the outside diameter of the tube is comprised essentially of: (100) ' which are arranged against the outer surface of the folded plate at the initial moment of dot formation; by adjustable bases (97), on which the rollers (92) 'are mounted; by an octagonal frame structure (97) ', which is arranged around the initial portion of the forming tube (300), mounted on the lower carriage (200) and on the inner face of which the adjustable bases (97) are mounted. ) supporting the rollers (92) 'against the bent plate. 9.) "MOBILE SHEET PIPE FACTORY" as claimed in 6, characterized in that the inner tube support roller assembly (93) is essentially comprised of rollers (93) 'which lie against the inner surface of the plate. bent in the initial region of tube formation; adjustable base (98) supporting the rollers; and by structure (98) projected within the initial portion of the forming tube. 10.) - "MOBILE SHEET PIPE FACTORY" as claimed in 6, characterized in that the set of rollers (94) supporting the backrest of the side edges of the plate comprises essentially: roller (94) 'which lies over regions outer edges adjacent to the juxtaposed edges (301) 'of the folded sheet (301); by base (99) that supports orolete; and by frame (99) 'which supports base (99). 11. "MOBILE SHEET PIPE FACTORY" as claimed in 6, characterized in that the welding machine assembly (110) is formed by two submerged arc release machines: a submerged arc welding machine (111) which makes external continuous helical weld for joining the adjacent edges of the steel plate in the tube formation, which has its weld-acting parts, mounted on equipment structures outside the tube and a submerged arc welding machine (111) ' which makes continuous continuous helical welding for joining the adjacent edges of the plate, which has its parts acting on the welding point mounted on the calender arm (95), such that the external welding machine (111) is before the machine weld (111) 'considering the direction of rotation of the steel plate. 12. "MOBILE PLATE MOBILE FACTORY" as claimed in 11, characterized in that each external (111) and internal (111) 'welding machine is essentially formed by a direct current supply (112) set. including enclosure housing the DC source, wiring connected to the power supply (150), electrode located at the solder point, and wired to source-derived wiring; by adding material yarn feed assembly (113) including a yarn containing reel, tensioning means for longitudinally displacing the yarn, yarn directing means for the unwrapped point; by granular cover material feed assembly (114) including hopper containing cover material, hopper-derived hoses which direct gravity cover material to weld points; and by circuit (115) of reuse of excess cover material. 13. "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized by the roller bed (130) for supporting and advancing the tube (300) as it is manufactured, has an inlet end disposed at the outlet of the assembly. calender (90) and de-machine (110), are substantially orthogonal to the low trailer (200), and supported on the floor; said roller bed (130) is a collapsible structure comprised essentially of: a plurality of roller assemblies disposed at regular spaces under and along the tube, each formed by: roller (131), on which the tube is directly supported; and base (132) on which the rollers are supported and completing the roller bed (130) there is provided a detachable carrier structure (133), on which the bases (132) are mounted and which is supported on the floor. 14.) - "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that the power supply means (150) is a generator set that is mounted on the low front end (200) and sufficient to supply the power electrical for manufacturing process. 15.) - "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that the low trailer (200) is usual, consisting essentially of a platform, on which the factory equipment is mounted and supported on chassis and this on top of the wheel assembly and in front of said low trailer (200) there is a coupling part for engaging the mechanical horse (220); said low trailer (200) additionally has essentially closed: by platform mounted frame, by hinged side closures (201), which can be moved between: vertical position, which support the frame and act as walls and horizontal position, which support on arms (201) 'articulated on the side of the platform and act as walkways; by rear closure (202), formed by a roll-up door that can be opened for mounting the coil in the coil; by upper closure (203) which can also be arranged on the sides of the side closures when in the position of catwalks to cover them and the mechanical horse (220) is of type crane (221), for moving used materials by factory and others. 16. "MOBILE SHEET PIPE FACTORY" as claimed in 1, characterized in that it provides for other components: hydraulic system, pneumatic system, tools and others for the most diverse purposes used in tube manufacturing, which are transported in the reel or truck transport aid.