• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    Device for applying protective cover of a polymeric material in a pipe. A method of applying protective cover (12) of polymeric material in a pipe (P), the method including the steps of advancing a conveyor (16) along an annular path that extends around the longitudinal axis (Al ) of the pipe (P); the extrusion of the protective cover (12) on the conveyor (16); the winding of the protective cover (12), as it is extruded, around a collar (8) in the pipe (P); and the plasticization of the polymeric material on board the conveyor (16).
    公开号:BR112013032329B1
    申请号:R112013032329-9
    申请日:2012-05-31
    公开日:2020-10-27
    发明作者:Valerio Bregonzio
    申请人:Saipem S.P.A；
    IPC主号:
    专利说明:

    Technical field
    [001] The present invention relates to a method of applying a protective layer of polymeric material in a pipe, and in particular on a collar in the pipe.
    [002] The method according to the present invention is part of a pipe construction method, in particular for the construction of underwater pipes placed on the bed of a body of water. state of art
    [003] Pipes are normally constructed by joining the free front ends of two adjacent tube sections, longitudinally aligned to form a collar or reduction; and wrap the protective layer over the cut. The pipes are made of sections of pipe joined together to cover distances of hundreds of kilometers. Each section of tube is normally 12 meters long, with a relatively large diameter, varying between 0.2 and 1.5 meters, and comprises a metallic cylinder; a first coating of polymeric material to protect the metal cylinder; and possibly a second coat of gunite or concrete, which serves as a ballast and is not always necessary. To weld the metal cylinders, at the opposite free ends of each section of pipe there is no first or second coating; and the pipe sections are joined both on land installations and on board ships designed to lay piping as it is being built.
    [004] The union of the tube sections comprises the welding of the metallic cylinders, normally in a number of passes; and renewing or adding the first and second coatings (if any). Once an annular weld bead is formed between each two adjacent metallic cylinders, the collar extends mounted on the annular weld bead, along a bare portion without the first or second coating. In other words, the collar is substantially defined by the free ends of the pipe sections, extends axially between the two terminal portions of the first coating, and must be covered with a protective coating to prevent corrosion.
    [005] The addition of the first coating along the collar is known as 'field joint coating', and normally comprises the coating of the collar with three layers of polymeric material to protect and ensure the adhesion of the coatings to the metal cylinders. More specifically, it comprises heating, for example, induction heating, the collar to a temperature of 250 ° C; spraying the collar with powdered epoxy resin (FBE - bonded epoxy fusion) which, in contact with the collar, forms a first layer relatively thin or "primer", the sprinkling of the collar, on the top of the first layer, with a modified copolymer, which acts as an adhesive and, in contact with the first coating, forms a second relatively thin layer; and the application of a third layer, called "top coat", which also partially extends over the first coat layer. The second coat layer, if any, will then also be added ada.
    [006] Welding, non-destructive welding tests, and the addition of the first and second coatings are all carried out at work stations equally spaced along the path of the pipe sections (or the pipe being constructed, if the pipe sections are attached to it), so that the tube sections are advanced in stages and stopped for a given period of time at each workstation.
    [007] A known method for applying the third layer to add the first coating comprises extruding and simultaneously wrapping a thick protective layer around the collar, as described in the applicant's patent application WO 2008/071773 and in the applications patent EP 1,985,909, WO 2010/049353 and WO 2011/033176. In the described methods, the protective layer is applied through an extrusion port mounted on a conveyor, which moves along an annular path around the longitudinal axis of the pipe; and the polymeric material is plasticized by a plasticization device located close to the pipe and connectable both selectively and connected by hose to the extrusion head. Both methods of feeding soft polymeric material into the extrusion head have disadvantages, taking into account the physical characteristics of the polymeric material, which, in order to remain soft, must be heated within a given temperature range. Description of the invention
    [008] An objective of the present invention is to provide a method of applying the protective layer of the polymeric material in a collar in a pipe, designed to eliminate the drawbacks of the state of the art.
    [009] In accordance with the present invention, a method of applying a protective layer of polymeric material to a pipe is provided, the method comprising the steps of advancing a conveyor along an annular path that extends around the longitudinal axis of the piping; extrude the protective layer on the conveyor; wrap the protective layer, as it is extruded, around a collar in the pipe; and plasticizing the polymeric material on board the conveyor.
    [010] The method according to the present invention has the advantage of applying the protective layer at a very high temperature and, therefore, in a highly plastic state able to adapt to uneven surfaces. In addition, the polymeric material is easily fed into the conveyor in a solid state; and the relatively short distance covered by the polymeric material simplifies the control of temperature and pressure and reduces the amount of energy needed to heat it.
    [011] In a preferred embodiment of the invention, the method comprises storing the plasticized polymeric material in the carrier.
    [012] This solution does away with the coating application step, which is usually relatively fast in relation to the plasticization step, which is normally relatively slow and related to the size and heating energy of the plasticizing device. By storing the plasticized polymeric material in the conveyor, the polymeric material can be plasticized during the period of inactivity between applications.
    [013] In a preferred embodiment of the invention, the method comprises advancing the pipe, with respect to the conveyor, in a direction parallel to the longitudinal axis of the pipe to position the conveyor on the next collar; and the polymeric material is conveniently plasticized mainly as the pipeline advances in relation to the conveyor, that is, when the conveyor is idle.
    [014] The method preferably comprises feeding polymeric material in a solid state into a plasticization device feeding port on the conveyor as the pipeline advances.
    [015] The method preferably comprises selectively securing the conveyor in an axial direction to the piping; and advance the conveyor around the collar, with the conveyor attached to the pipe.
    [016] In a preferred embodiment of the invention, the method comprises the plastification of the polymeric material and the extrusion of the protective layer by means of a plastification and extrusion assembly mounted on the conveyor and comprising an extrusion head with an extrusion port . The plasticization and extrusion assembly is preferably a one-piece block, which is mounted on the conveyor in an adjustable way and is preferably connected to the conveyor to allow remote control of the block position and adjust the distance between the extrusion port and the collar depending on the position of the conveyor along the annular path.
    [017] In a preferred embodiment of the invention, the method comprises pressing the protective layer over the pipe by means of a bearing assembly articulated to the conveyor and comprising a roller; and adjusting the pressure exerted by the roller on the protective layer.
    [018] The roller is preferably driven to rotate around its axis; and the method comprises adjusting the rotation speed and reversing the direction of rotation of the roller.
    [019] The roller plays a vital role in the correct addition of the first coating, and in preventing the formation of air bubbles between the protective layer and the collar. Adjusting the pressure exerted by the pressure roller allows it to be adapted to the physical condition of the protective layer; by adjusting the speed of the roller, the rotation of the roller can be synchronized with the travel speed of the conveyor, in order to avoid shear stress as the roller moves over the protective layer; and reversing the direction of rotation of the roller allows it to be used also when the conveyor is moving in the opposite direction of application.
    [020] In a preferred embodiment of the invention, the method comprises extruding an initial portion of the protective layer with the carrier stopped and positioned in such a way that the initial portion of the protective layer is introduced by means of the force of gravity between the tubing and the roller; and securing the initial portion between the roller and the tubing.
    [021] In this way, the initial portion of the protective layer is fixed immediately to the pipeline by means of the roller, with sufficient pressure to prevent the formation of air bubbles.
    [022] The method preferably comprises advancing the conveyor over the collar when the initial portion of the protective layer is trapped between the tubing and the roller.
    [023] Therefore, keeping the portion of the protective layer between the extrusion port and the roller tensioned, the risk of air bubbles forming between the protective layer and the pipe is reduced.
    [024] In a preferred embodiment of the invention, the method comprises cutting the protective layer extruded in the extrusion port; and, preferably, the extrusion port is closed by means of a blade.
    [025] By doing so, the advantages of the pure, clean completion of the formation of protective covers are obtained and the soft polymeric material is prevented from dripping from the extrusion port.
    [026] In a preferred embodiment of the invention, the method comprises adjusting the speed of travel of the conveyor as a function of the position of the conveyor along the annular path, to ensure an optimal application of the protective layer.
    [027] Due to the conveyor carrying out at least one complete turn on the pipe, and given the considerable weight and delicate nature of the soft protective layer, it is advisable to regulate the speed of travel of the conveyor, at least along the most critical points.
    [028] For the same reasons, it is also advisable to adjust the distance between the extrusion port of the protective layer and the piping, depending on the position of the conveyor.
    [029] In a preferred embodiment of the invention, the step of pressing the protective layer over the pipe by means of a bearing assembly comprises rolling the roller, directly downstream of the extrusion port, in a first direction of rotation of the conveyor , during the extrusion of the protective layer; and keeping the roller pressed on the protective layer in a second direction of rotation of the conveyor opposite the first direction of rotation.
    [030] This solution has the advantage of improving the adhesion of the protective layer in the piping, and is made possible by the rotation of the roller being reversible, and by the pressure of the roller being adjustable. That is, as the roller rolls in the first direction of rotation of the conveyor, the polymeric cover is just placed and is highly plastic. Considering that as the roller rolls in the second direction of rotation of the conveyor, the roller finds portions of the protective layer placed longer, more and more firm, in such a way that the pressure of the roller is gradually increased as it rolls in the second direction of rotation of the conveyor.
    [031] Another objective of the present invention is to provide a device for applying a protective layer of polymeric material over a collar in a pipe, designed to eliminate the disadvantages of the state of the art.
    [032] In accordance with the present invention, a device is provided for applying a protective layer of polymeric material in a pipe, the device comprising a conveyor, which moves along an annular path that extends over the longitudinal axis of the pipe to apply the protective layer to a collar on the pipe; and a plasticization and extrusion assembly mounted on the conveyor to plasticize the polymeric material, from which the protective layer is made, and the extrusion of the protective layer on board the conveyor.
    [033] Preferably, the plasticization and extrusion assembly is a single piece block that features a feed port for the solid, preferably granular, polymeric material and an extrusion port for applying the protective layer.
    [034] The soft polymeric material in this way is moved a very short distance and is therefore easily controllable.
    [035] In a preferred embodiment of the invention, the device comprises a contoured roller, in turn comprising a central portion; two side portions smaller in diameter than the central portion; and a groove formed in the central portion to adapt the roller to the shape of a central weld bead on the collar. Brief description of the drawings
    [036] A preferred embodiment of the present invention will be described, by way of example, with reference to the accompanying drawings, in which: - figures 1 and 2 show sections, with parts removed for clarity, of the pipe sections in several stages of union; figures 3 and 4 show sections on a larger scale, with parts removed for clarity, of pipe sections in several stages of the method according to the present invention; figure 5 shows a perspective view, with parts removed for clarity, of the device for applying the protective layer of polymeric material according to the present invention; figure 6 shows a side view on a larger scale, with parts removed for clarity, of a component part of the device of figure 5; figures 7 and 8 show perspective views on a larger scale, with parts removed for clarity, of a conveyor of the device of figure 5; figure 9 shows a perspective view, with parts removed for clarity, of a detail of the device; figure 10 shows a schematic diagram of the device control system of figure 5; - figures 11 to 14 show schematic diagrams, with parts removed for clarity, of a sequence of operation of the device in figure 5. Best way to carry out the invention
    [037] The number 1 in figure 1 indicates two sections of tube, each of which comprises a metallic cylinder 2; a first coating 3 of polymeric material, usually polyethylene or polypropylene, in contact and for the corrosion protection of the metallic cylinder 2; and a second gunite or concrete coating 4 for the ballast.
    [038] In an alternative embodiment not shown, the tube sections do not have the second coating.
    [039] Each section of tube 1 has two opposing free ends 5 (only one shown in figures 1 and 2) without the first coating 3 or the second coating 4. The first coating 3 has a chamfer 6 on each free end 5. Two successive tube sections 1, aligned along a longitudinal axis Al (figure 1), are positioned with the free ends 5 together, parallel and facing each other, and are welded, possibly in a number of passes in workstations successive, to form an annular weld bead 7 to each other (figure 2). As shown in figure 2, the two welded pipe sections 1 form a collar 8 that extends along the longitudinal axis Al, between the chamfers 6 in the first coating 3, and along the annular weld bead 7.
    [040] When joined, the pipe sections 1 form a pipe generically indicated by P, and which, in the present description, also includes the pipe to be constructed and formed, for example, by only two pipe sections 1 joined.
    [041] In addition to the welding of the metal cylinders 2, the joining of the pipe sections 1 also comprises the addition of the first coating 3 and possibly also the second coating 4. The addition of the first coating 3 comprises the grain blasting of the surface collar 8; induction heating of collar 8 to about 250 ° C; and the application in rapid succession over collar 8 of the first layer 9, the second layer 10, and the third layer 11 of polymeric material (figure 3).
    [042] As shown in figure 3, the first layer 9 is a 100 to 500 micron thick epoxy resin coating (FBE - connected epoxy fusion) sprinkled in the form of powder on collar 8, using a spray gun not shown. The second layer 10 is a modified copolymer coating of 100 to 500 microns thick, usually CMPE or CMPP, sprinkled in powder form on the first layer 9 on collar 8, using a spray gun not shown. And third layer 11 is a polymer layer 2 to 5 mm thick, preferably polyolefin, CMPE or CMPP, applied by wrapping a single portion of protective layer 12 of polymeric material around collar 8 in a workstation 13, as shown in figure 5. In the example shown, protective layer 12 is wrapped around collar 8 at station 13 (figure 5), it is wider than collar 8 (measured along the longitudinal axis Al - figure 2 ), in such a way that the first coatings 3 and the chamfers 6 of both sections 1 are superimposed, and it is long enough to wrap completely around the collar 8 and overlap the ends.
    [043] In reality, the protective layer 12 is extruded as it is wrapped around the P pipe.
    [044] With reference to figure 4, the second layer 4 is renewed with a layer of cement C.
    [045] In figure 5, the number 14 indicates a device for the plasticization of the polymeric material from which the protective layer 12 is made, and for the extrusion and, simultaneously, the wrapping of the protective layer 12 around the P pipe.
    [046] The construction of the P pipe, in particular on board a settlement vessel (not shown), comprises feeding the P pipe in stages in a direction Dl parallel to the longitudinal axis Al; and fixing device 14 to tubing P on collar 8. Device 14 is located on work station 13, and comprises a frame 15; a movable conveyor 16 along structure 15; a plasticization and extrusion assembly 17 mounted on the conveyor 16; a bearing assembly 18 mounted on the conveyor 16; a hopper 19 for feeding the solid polymer material into the plasticizing and extrusion assembly 17; and a control unit 20 connected to the conveyor 16. Structure 15 comprises two front and rear handles 21; and beams 22 for rigidly connecting handles 21. Each handle 21 is annular and has a sector 23 and two sectors 24 complementary to each other to define a ring. The sectors 23 of the handles 21 are rigidly connected to each other by the beams 22; and the two sectors 24 of each handle 21 are articulated in the corresponding sector 23 around the axes parallel to the longitudinal axis Al, and are operated by means of the actuators 25 to rotate from the closed position in figure 6 to an open position (not shown) ) to release device 14 from tubing P. Sectors 23, 24 feature adjustable spacers 26 that face and are designed to be positioned in contact with tubing P, and which are adjusted to precisely center structure 15 on the P tubing.
    [047] As shown in figure 6, in the closed position, sectors 23, 24 of each handle 21 define a circular guide 27 for the conveyor 16 (figure 5); and a circular rack 28, which cooperates with the conveyor 16 (figure 5) to move it forward.
    [048] As shown in figure 5, the structure 15 is designed to selectively connect the device 14 in the P pipe; to center the TI guide in relation to the longitudinal axis Al of the pipe P; and to support and guide the conveyor 16 along an annular path.
    [049] As shown in figures 7 and 8, the conveyor 16 comprises two actuators 29 for moving the conveyor 16 forward; two plates, facing each other, formed in sector 30; and two beams 31 that connect the plates 30 facing each other. The outer face of each plate 30 is equipped with rollers 32 to engage the guide 27 (figure 6); and a pinion 33, operated by the respective actuator 29 and designed to engage the rack 28 (figure 6) to move the conveyor 16 along the annular path over the pipe P (figure 5). The conveyor 16, in fact, serves to support and move the plasticization and extrusion set 17 and roll the set 18 around the P pipe (figure 5).
    [050] As shown in figure 9, the plasticizing and extrusion assembly 17 comprises a plasticizing device 34, a storage tank 35, and an extrusion head 36, which, in the preferred embodiment of the invention, form a single block rigid mounted on the conveyor 16, between the plates 30, to rotate about an axis A2 parallel to the longitudinal axis Al (figure 7), to adjust the position of the extrusion head 36 in relation to the pipe P (figure 5). For this purpose, as shown in figure 7, the plastification and extrusion set 17 is connected to the conveyor 16 by means of an actuator 37, to precisely adjust the position of the plastification and extrusion set 17 around the A2 axis.
    [051] As shown in figure 9, the plasticizing device 34 is a type of screw driven by a motor 38 and a reducer 39, and comprises a cylinder 40, which in turn comprises a portion of 43, and a portion 41 with a feed port 42. Portion 41 is preferably cooled by a water circuit, and portion 43 is preferably heated by electrical resistors. The cylinder 40 is connected by means of a U-shaped fixing element to the storage tank 35, which comprises a chamber 44, preferably a cylinder, in which a piston 45 is operated by an actuator 46, preferably electromagnetic, for change the volume of the storage tank 35. The rod (not shown) of piston 45 is preferably defined by a screw operated by a helical gear (not shown).
    [052] To reduce its size and weight, the plasticizing device 34 is designed to provide a maximum amount of soft polymeric material less than the maximum capacity of the extrusion head 36.
    [053] The extrusion head 36 comprises a slot-shaped extrusion port 47 designed to form the protective layer 12 of the necessary width and thickness, and is connected directly to the storage tank 35. The plasticization and extrusion set 17 also comprises a blade 48 mounted on the extrusion port 47 of the extrusion head 36 to selectively cut the extruded protective layer 12, which is operated by means of an actuator 49 mounted on the extrusion head 36, and also serves to close the door extrusion 47 in order to prevent the polymeric material from dripping.
    [054] As shown in figures 7 and 8, the bearing assembly 18 is mounted on the conveyor 16, and comprises a roller 50; a support structure 51 adjustable to the conveyor 16; an articulated connection 52, in particular, an articulated quadrilateral, which connects the roller 50 to the support structure 51; and an actuator 53 between the hinge connection 52 and the support structure 51. The support structure 51 provides precise adjustment of the position of the entire bearing assembly 18 in relation to the conveyor 16.
    [055] As shown in figure 8, the bearing assembly 18 comprises an actuator 54 mounted on the articulated connection; and a transmission 55 for connecting the actuator 54 to the roller 50 and rotating the roller 50 at selectively adjustable speeds and in opposite directions. Roller 50 is made of rigid material, preferably metallic, and has a contour profile substantially defined by a central portion 56 designed to come into contact with collar 8, and by two smaller diameter side portions 57 designed to come into contact with the protective layer 12 in the coating 3. The roller 50 has a contoured groove 58 formed in the central portion 56 to adapt the roller to the shape of the annular weld bead 7 (figure 3).
    [056] As shown in figure 5, the hopper 19 is located above the device 14, and can be selectively connected to the feed port 42 to feed the solid polymer material, preferably granular, in the plasticizing device 34 when conveyor 16 is in a rest position along the P pipe.
    [057] As shown in figure 10, the control unit 20 is connected to actuators 25 to selectively open and close sectors 24; actuators 29 for moving conveyor 16 along the annular path; to actuator 37 to adjust the inclination of the plasticization and extrusion set 17; motor 38 to drive plasticizing device 38; to actuator 46 of piston 45; to actuator 49 of blade 48; actuator 53 to adjust the position of the roller 50; and to actuator 54 to rotate roller 50.
    [058] The control unit 20 is also connected to the TC thermocouples mounted on the entire plasticization and extrusion assembly 17 to keep the polymeric material soft at the temperatures necessary to plasticize it and feed it into the extrusion port 47; and to the temperature sensors T and pressure sensors P mounted in the plasticization and extrusion assembly 17 to determine the condition of the polymeric material and adjust the thermo couplers TC accordingly.
    [059] As shown in figure 5, the conveyor 16 is connected to a cable bundle 59, which comprises signal cables, power cables, compressed air supply tubes, and refrigeration circuit tubes for cooling the feed port 42.
    [060] With reference to figure 5, in real use, the pipe P, when released from the device 14, moves one step forward with respect to the device 14 in the direction Dl parallel to the longitudinal axis Al. In this step, the conveyor 16 moves it is in the rest position along the pipe P, and the hopper feeds the polymeric material in the plasticizing device 34, which plasticizes it and feeds it into the storage tank 35. Moving the pipe P forward takes much more time than it does for extrude and apply the protective layer 12, such that the time allocated to plasticize the polymeric material is long enough to employ a relatively small plasticizing device 34 to plasticize enough polymeric material to the protective layer 12. Next, the device 14 is attached to the P pipe, with the extrusion head 36 positioned on the collar 8 (figure 2).
    [061] With reference to figure 11, in the resting position, the extrusion port 47 is located on one side, in an upper quadrant of the annular path, and the roller 50 is at a given distance from the P pipe. In the initial extrusion step, the conveyor 16, that is, the extrusion head 36, is held stationary in its resting position, and a first portion of the protective layer 12 is extruded and falls freely by the action of gravity in a position between the tubing P and roller 50. Referring to figure 12, when the first portion of protective layer 12 is located between tubing P and roller 50, roller 50 is activated to press it against tubing P. At this point, the conveyor 16, that is, the extrusion head 36, can start to move along the annular path, so that the supply of solid polymer material is cut, and the plasticization continues as long as there is no polymeric material inside the plasticizing device34.
    [062] With reference to figure 13, as the conveyor 16 moves forward, the extrusion of the protective layer 12 continues by gradually expelling the polymeric material from the storage tank 35 through the extrusion head 36 and the extrusion port 47. The roller 50 is moved in sync with the conveyor 16, so as to roll over and press the protective layer 12 in the pipe P without generating shear stresses in the protective layer 12, which is still soft when applied . The speed of the piston 45 is also synchronized with the speed of the conveyor 16 to form the protective layer 12 with constant thickness. In this step, the protective layer 12 being extruded is kept substantially stretched between the extrusion port and the handle point between roller 50 and tubing P, such that protective layer 12 is pressed firmly over tubing P to prevent the air is trapped between the tubing and protective layer 12, and that it would be difficult to expel once protective layer 12 is applied.
    [063] Adjusting the travel speed of the conveyor 16 is particularly effective and therefore the speed of the piston 45 and the rolling speed of the roller 50 depending on the position of the conveyor 16. In fact, the speed with which the protective layer 12 is applied is affected by the two factors in connection with the position of the conveyor 16 and, therefore, of the protective layer 12 itself: the force of gravity on the emission of the protective layer 12 from the extrusion port 47; and the fragile nature of the soft protective layer 12. Therefore, the position of the extrusion port 47 with respect to tubing P affects the shape of the protective layer 12 and, the conveyor 16 must be accelerated or decelerated at certain points along the annular path. This speed variation can be conveniently programmed, for example, by dividing the route into sectors and assigning a given travel speed to each one.
    [064] For the same reasons, and to prevent the protective layer 12 from coming in contact with the P pipe downstream of the pickup point by the roller 50, the distance between the extrusion opening 47 and the P pipe during the application of the protective layer 12 is conveniently adjusted according to the position of the conveyor 16.
    [065] Considering the width of the protective layer 12, one turn of the conveyor 16 over the pipe P is sufficient to add the first layer of coating 3 (figure 3). In reality, the conveyor 16 moves 360 ° to allow the roller 50 to compact and eventually overlap the opposite ends of the protective layer 12, as shown in figure 14.
    [066] With reference to figure 14, once extruded, the protective layer 12 is cut by the blade 48, which closes the extrusion port 47 to prevent the polymeric material from dripping.
    [067] At this point, the conveyor 16 is returned to the initial resting position (figure 11), moving along the annular path in the opposite direction (to the right in figure 14) so that it is displaced during the application of the protective layer 12. In this step, the roller 50 is kept pressed against the protective layer 12 and is rotated in the opposite direction.
    [068] When the conveyor 16 reaches the initial resting position, the device 14 is released from the pipeline P to allow it to move freely in relation to the device 14; and the plasticization and extrusion set 17 is ready to start the next cycle.
    [069] The advantages of the method described and illustrated are evident.
    [070] Clearly, changes can be made to the preferred embodiment described in the present invention, without, however, departing from the scope of protection of the accompanying claims.
    权利要求:
    Claims (21)
    [0001]
    1. Field joint coating method for the application of a protective layer of polymeric material in a pipe, for the construction of underwater pipes, characterized by understanding the steps of advancing a conveyor (16) along an annular path that extends around the longitudinal axis (Al) of a pipe (P); extrusion of the protective layer (12) on the conveyor (16); wrapping the protective layer (12), as it is extruded, around a collar (8) in the pipe (P); plasticization of the polymeric material located on board the conveyor (16), especially as the piping (P) advances in relation to the conveyor (16); the advance of the pipe (P) in relation to the conveyor (16) being in a direction (Dl) parallel to the longitudinal axis (Al) of the pipe (P); and storing the plasticized material on the conveyor (16); the plasticization step of the polymeric material being carried out mainly as the pipe (P) advances in relation to the conveyor (16).
    [0002]
    Method according to claim 1, characterized in that it comprises the step of feeding the polymeric material in the solid state into the feeding port (42) of a plasticizing device (34) on the conveyor (16) insofar as the pipe (P) advances.
    [0003]
    Method according to any one of the preceding claims, characterized in that it comprises the step of fixing the conveyor (16) selectively in an axial direction (Dl) in the pipe (P); the step of advancing the conveyor (16) around the collar (8) being carried out with the conveyor (16) attached to the pipe (P).
    [0004]
    Method according to any one of the preceding claims, characterized in that the steps of plasticizing the polymeric material and extruding the protective layer (12) are carried out by a plasticizing and extruding assembly (17) mounted on the conveyor (16) and which comprises an extrusion head (36) with an extrusion port (47).
    [0005]
    5. Method according to claim 4, characterized in that it comprises the step of orienting the plasticization and extrusion assembly (17) around an axis (A2) parallel to the longitudinal axis (Al) of the pipe, to adjust the distance between the extrusion port (47) and the collar (8) depending on the position of the conveyor (16) along the annular path.
    [0006]
    6. Method according to any one of the preceding claims, characterized in that it comprises the step of pressing the protective layer (12) on the pipe (P) by means of a bearing assembly (18) articulated with the conveyor (16) and comprising a roller (50).
    [0007]
    Method according to claim 6, characterized in that it comprises the step of adjusting the pressure exerted by the roller (50) on the protective layer (12).
    [0008]
    Method according to claim 6 or 7, characterized in that the roller (50) is driven to rotate about its axis; the method comprising the step of adjusting the speed of rotation and reversing the direction of rotation of the roller (50).
    [0009]
    Method according to any one of the preceding claims, characterized in that the step of extruding the protective layer (12) comprises extruding an initial portion of the protective layer (12) with the conveyor (16) stationary and positioned in such a way that the first portion of the protective layer (12) is inserted by means of the force of gravity between the pipe (P) and a roller (50) to compress the protective layer (12); and securing the initial portion of the protective layer (12) between the roller (50) and the tubing (P).
    [0010]
    10. Method according to claim 9, characterized in that the step of advancing the conveyor (16) around the collar (8) is activated when the initial portion of the protective layer (12) is trapped between the pipe (P) and the roller (50).
    [0011]
    Method according to any one of the preceding claims, characterized in that it comprises the steps of cutting the protective layer (12) in the extrusion port (47) after the completion of the extrusion step; and closing the extrusion port (47), preferably by means of a blade (48) to cut the protective layer (12).
    [0012]
    Method according to any one of the preceding claims, characterized in that it comprises the step of adjusting the travel speed of the conveyor (16) according to the position of the conveyor (16) along the annular path, to ensure an ideal application of the protective layer (12).
    [0013]
    13. Method according to any one of the preceding claims, characterized in that it comprises the step of adjusting the distance between the pipe (P) and an extrusion port (47) for the extrusion of the protective layer (12), in order to ensure an ideal application of the protective layer (12).
    [0014]
    14. Method according to any one of claims 6 to 13, characterized in that the step of pressing the protective layer (12) on the pipe (P) by means of a bearing assembly (18) comprises the roller bearing (50), directly downstream of the extrusion port (47), in a first direction of rotation of the conveyor (16) during the extrusion of the protective layer (12); and keeping the roller (50) pressed on the protective layer (12) in a second direction of rotation of the conveyor opposite the first direction of rotation.
    [0015]
    15. Field joint coating device for the application of a protective layer of polymeric material in a pipe, for the construction of underwater pipes, the device (14) characterized by comprising a conveyor (16), which moves along an annular path that extends around the longitudinal axis (Al) of the pipe (P) to apply the protective layer (12) on a collar (8) on the pipe (P); and a plasticization and extrusion assembly (17) mounted on the conveyor (16) to plasticize the polymeric material from which the protective layer (12) is made, and extrude the protective layer (12) on board the conveyor (16), wherein the plasticizing and extruding assembly (17) comprises a plasticizing device (34); a storage tank (35) for storing plasticized polymeric material on board the conveyor (16); and an extrusion head (36) with an extrusion port (47); the plasticizing device (34) being designed to feed a quantity of soft polymeric material less than the capacity of the extrusion head (36).
    [0016]
    16. Device according to claim 15, characterized in that the plasticization and extrusion assembly (17) is mounted on the conveyor (16) to rotate about an axis (A2) parallel to the longitudinal axis (Al) of the pipe, such as to remotely adjust the distance between the extrusion port (47) and the collar (8).
    [0017]
    Device according to claim 16, characterized in that the plasticization and extrusion assembly (17) comprises a blade (48) articulated in relation to the extrusion head (36) for cutting the protective layer (12) extruded in the port extrusion (47), and to close the extrusion door (47); the blade (48) is preferably remote controlled.
    [0018]
    18. Device according to any one of claims 15 to 17, characterized in that it comprises a bearing assembly (18) articulated with the conveyor (16) and comprising a roller (50) for pressing the protective layer (12) on the collar (8).
    [0019]
    19. Device according to claim 18, characterized in that the bearing assembly (18) comprises an articulated connection (52); and an actuator (53) for adjusting the pressure exerted by the roller (50) on the protective layer (12), and the position of the roller (50) with respect to the collar (8).
    [0020]
    Device according to claim 18 or 19, characterized in that the roller (50) is contoured, and comprises a central portion (56); two side portions (57) smaller in diameter than the central portion (56); and a groove (58) formed in the central portion to adapt the roller (50) to the shape of a central weld bead (7) on the collar (8).
    [0021]
    21. Device according to any one of claims 18 to 20, characterized in that the roller (50) is driven to rotate around its axis
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    同族专利:
    公开号 | 公开日
    AU2012270042B2|2017-06-01|
    AU2012270042A1|2014-01-16|
    EP2700490A1|2014-02-26|
    RU2013157182A|2015-07-27|
    WO2012172451A1|2012-12-20|
    EP2535168A1|2012-12-19|
    US20140154409A1|2014-06-05|
    ITMI20111104A1|2012-12-18|
    EP2535168B2|2016-11-30|
    RU2593619C2|2016-08-10|
    US9956583B2|2018-05-01|
    EP2535168B1|2013-11-20|
    BR112013032329A2|2016-12-20|
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-15| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-04-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-27| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/05/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    ITMI2011A001104|2011-06-17|
    IT001104A|ITMI20111104A1|2011-06-17|2011-06-17|METHOD AND EQUIPMENT TO APPLY A PROTECTIVE SHEET OF POLYMERIC MATERIAL WITH A PIPE|
    PCT/IB2012/052758|WO2012172451A1|2011-06-17|2012-05-31|Method and device for applying protective sheeting of polymer material to a pipeline|
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