WO2021213714A1

WO2021213714A1 - Roller application device for applying a coating layer on the inner side of a large-diameter tube

Info

Publication number: WO2021213714A1
Application number: PCT/EP2021/055089
Authority: WO
Inventors: Peter Scobel
Original assignee: EISENBAU KRäMER GMBH
Priority date: 2020-04-22
Filing date: 2021-03-02
Publication date: 2021-10-28
Also published as: DE102020110931A1

Abstract

The invention relates to a roller application device for applying a coating layer (11) to the inner side of a carrier layer (10) of a metal large-diameter tube by means of a pressure roller (21), which is mounted, rotatably and by means of a open-loop or closed-loop-controlled force application unit having a piston/cylinder assembly (23), in a pressure section (214) of a rotatable roller application head (20) such that it can be adjusted by exerting a pressure force radially in the X direction, and which is supported by means of a support unit (220) provided therein when rolling the coating layer (11) against the inner side of the large-diameter tube. The piston/cylinder assembly (23) comprising at least one piston/cylinder unit (230, 231) is connected to a reservoir containing hydraulic fluid, in particular hydraulic liquid, via a line assembly (25) having a feed line (250) and a return line (251), wherein, by obtaining a predefined pressure force of the piston/cylinder assembly (23), the hydraulic fluid can be supplied to or discharged from same by means of an open-loop or closed-loop control unit.

Description

Roll-on device for applying a layer on the inside of a large pipe

The invention relates to a rolling device for applying a support layer on the inside of a carrier layer of a large metal pipe by means of a pressure roller, which can be rotated and adjusted radially in the x-direction by means of a controlled or regulated force application unit having a piston / cylinder arrangement while exerting a pressure force a pressing section of a rotatable rolling head and is supported by means of a support unit present in this when rolling the support layer against the inside of the large pipe.

A device of this type is specified in WO 2016/142162. The roll-on device has a pressure roller mounted in a pressure section of a roll-on head, which can be rolled in the circumferential direction under the application of force by means of a piston / cylinder unit on the inside of an inner tube inserted in a carrier tube, around the inner tube wall to the inside of the carrier tube under plastic deformation to be pressed and thus to form a support layer (inliner, liner) which then non-positively lines the support tube on its inside. During the unwinding process, the pressure roller is supported diametrically opposite it by means of an arrangement of support rollers on the inside of the large pipe. The rotating drive of the rolling head takes place by means of a drive shaft coupled to it, with an axial advance being effected at the same time.

By rolling in and pressing (rolling on) the inner support layer continuously in the circumferential direction with plastic deformation and the simultaneous axial displacement of the pressure section or the pressure unit relative to the pipe unit consisting of the support tube and the inner tube, the support layer is applied evenly and permanently to the inner surface of the support layer in a force-fit and stable manner held without the outer tube having to be stretched. The carrier layer, which forms a thick-walled stable jacket, is thus practically not influenced in its structure, so that very different material partners can be combined in their metallurgical and / or geometric properties (thickness) for the production of the large pipe. A slight elongation of the carrier layer within its yield point is also possible, if desired. The design of the original outer tube and the (at least one) original inner tube is largely freely selectable, only the inner diameter of the outer tube and the outer diameter of the adjacent inner tube should be adapted to one another in such a way that the inner tube can be easily inserted into the outer tube and through the Rolling process can be non-positively connected with stretching beyond the yield point or plasticization along the inner surface of the outer tube. A practically smooth inner surface of the finished large pipe is achieved if the feed speed of the pressure unit during the unwinding of the pressure roller is matched to its rotational speed on the inner surface of the pipe unit in such a way that the plastically deformed, helically encircling strips overlap (e.g. simply or multiple times). In the case of large pipes, the large inner diameter and also metallurgically, as is usually the case with a (practically) non-elastically expandable outer pipe, give rise to given conditions that make the required stable rolling of an inner layer difficult. Large pipes often have out-of-roundness and ovality, which makes it even more difficult to apply the overlay layer in a uniform, permanently stable manner.

DE 102005029679 A1 also specifies a device for joining pipe profiles with an inner pipe profile in an outer pipe profile by expanding by means of a rolling element which is arranged in an expanding head and is supported by a rotating support shaft to apply the rolling forces. The rolling element moves like a planetary gear around the axis of rotation of the support shaft, which in turn rotates eccentrically around the center axis of the tubular profiles. To adjust the rolling element in the radial direction, the support shaft has a conical section and can in turn be displaced in the axial direction. A support element, designed as a support roller, for example, is arranged on the expansion head, which supports the rolling forces occurring on the rolling element against the inner surface of the inner tubular profile. The expansion head can be displaced along the pipe axis in order to produce joints at various points on the pipe profiles by expanding. This known device is especially designed for joining tubular profiles with smaller diameters. Uniform, stable application of the support layer and precise control of the rolling process in the event of irregularities is relatively expensive.

Another device for connecting a multi-layer large pipe with a pipe unit comprising an outer pipe forming a support layer and at least one inner pipe forming a support layer is disclosed in JP S59 787 15 A. In the process, the inner tube introduced into the outer tube is applied to the inner tube by means of a pressure roller that rotates around an axis of rotation that is spaced from the tube axis under contact pressure directed radially outward against the inner surface of the inner tube. inner wall of the outer tube pressed on. By pressing on, the wall thickness of the inner pipe is reduced and a circumferential groove is created. The pressure roller is then axially displaced and the groove is formed axially and continuously until the inner tube is tightly connected. As it rotates, the pressure roller is held on a central axis guided through the tube and supported on this. In this case, it is difficult to achieve stable support and uniform pressing of the inner pipe on the inner surface of the outer pipe in order to form the support layer.

There are also various other methods of applying a coating on the inside of a large pipe, such as e.g. B. by means of an expanding tool, by means of which a liner is expanded until it forms a bond with the outer tube, or by expanding an inner tube by means of a so-called hydroforming press.

The present invention is based on the object of providing a rolling device for applying a coating on the inside of a carrier layer of a large pipe, by means of which the coating process can be controlled as precisely as possible and a coating that is as uniform and stable as possible is obtained.

This object is achieved with a rolling device according to claim 1. According to the invention, the rolling device is designed in such a way that the piston / cylinder arrangement comprising at least one piston / cylinder unit is connected to a reservoir containing hydraulic fluid, in particular hydraulic fluid, via a line arrangement which has a flow line and a return line, the hydraulic fluid being connected by means of a control or regulating device can be fed to or removed from the piston / cylinder arrangement while maintaining a predetermined pressure force. With this design of the rolling-on device, an exact control or regulation of the pressing force is achieved during the rolling-on process and thus a coating that is uniformly stable in the event of irregularities in the large pipe.

An advantageous embodiment for the control or regulation of the rolling process or rolling process is that the at least one piston / cylinder unit is designed as a double-stroke piston / cylinder unit with two reciprocating pistons, one of which is coupled to the pressure roller via the pressing section of the rolling head and the other is coupled to the support unit, which advantageously has at least one support roller that acts directly on the inside of the large pipe when rolling against the pressure force of the pressure roller. This also results in a compact structure that is advantageous for production and operation.

A further advantageous embodiment for construction and operation is that a common flow line is connected on the input side between the two reciprocating pistons of the respective piston / cylinder unit and connections to a common return line are connected on the output side of the two reciprocating pistons of the respective piston / cylinder unit.

An advantageous embodiment variant consists in the fact that, if there are two piston / cylinder units, both are connected to a common feed line and a common return line.

Exact control or regulation of the pressing force with rapid response to changes in stroke due to irregularities or the like is achieved in that the piston / cylinder arrangement, in particular on the supply side, is fluid-conducting to a pressure compensation tank for varying the fluid volume in the piston / cylinder arrangement while the fluid pressure remains constant and thus constant predetermined pressure force is connected, with a fluid in the pressure equalization tank the space area is separated in a fluid-tight manner from a gas pressure space area under a predetermined pressure by means of a flexible partition.

In this case, it is advantageously provided for the structure and the function that the piston / cylinder arrangement is connected to the pressure compensation tank via the line arrangement, in particular the feed line.

For an advantageous structure and good function, the measures are also conducive to the fact that the pressure compensation container is attached to the rolling head so that it can rotate with it.

Further advantages for the structure and function as well as handling result from the fact that the rolling head is rotatably connected via a coupling section, in particular via a gear, to a drive shaft of a drive motor, which is connected to a motor housing that is non-rotatable with respect to the large pipe and is also non-rotatable with respect to the large pipe , in the z-direction extending feed rod is attached, via which the drive motor with the coupling section and the rolling head can be axially advanced in the large pipe. This results in a compact construction, the drive units with the drive motor close to the rolling head can be attached in a stable manner. These measures also contribute significantly to a uniform, exact application of the overlay layer.

Advantageous measures for the construction are that the flow line and the return line are guided via a rotary feedthrough between the rolling head and the motor housing. In this way, parts of the line arrangement that are stationary with respect to the large pipe can be easily led to the outside to a reservoir or a pumping device.

In order to ensure that the support layer is pressed evenly on, it is furthermore advantageously provided that the motor housing is advantageously provided with a circumferential support ring Plastic is provided, by means of which it can be axially displaceably supported in the interior of the large pipe under sliding friction. This ensures exact guidance of the rolling-on device in the vicinity of the rolling-on. For large pipes with different inside diameters, support rings with different outside diameters can simply be used.

The function and an even pressure even in non-circular sections of the large pipe is ensured by the fact that the coupling section is provided with a sliding bearing or roller bearing, which is designed as a y-guide radially to the axis of the front push rod and at right angles to the x-direction and preferably as a Li near storage or roller circulation unit is designed. With regard to the direction of force of the pressure axis (x-direction), a sliding or rolling, floating centering is also effected in the direction perpendicular thereto. In connection with the feed direction in the z-direction, degrees of freedom are obtained in the three mutually perpendicular spatial directions.

An advantageous structure of the pressure roller, which is circular in an axial plan view, consists in that the pressure roller has a radially symmetrical shape in an axial plan view and, on its outer circumferential surface with a circular cross-section in an axially extending central longitudinal plane, has a flat, axially parallel rolling section, which in longitudinal section - preferably on both sides - over the entire Circumferential surface rounded at a small angle less than 20 ° with respect to the direction of the axis of rotation or sloping down to a smaller radius and on both sides - preferably rounded - merges into side areas steeply sloping at a side angle between 70 ° and 90 °, which terminate in axially extending axial sections on both sides. In extensive investigations by the inventors, it has been shown that with this design of the rolling areas, the rolling process by rolling with plastic deformation of the inner tube advantageously succeeds. The flat part of the pressure roller results in a uniform rolling in the circumferential direction with a defined pressure force, while the leading one Slope allows a defined run-in into the still unformed areas of the inliner.

A stable guidance in the x-direction during the pressing process is supported by the fact that the rolling head has a rolling housing with a housing base that includes the support unit, and with a housing attachment that includes the pressing section, and that the housing base and the housing attachment with mutually complementary, Sections of a sliding guide designed as an x-guide or, advantageously, designed as a linear bearing or a circulating roller unit, which are supported in one another in a sliding or rolling manner, are provided. As a result, transverse forces on the piston / cylinder arrangement are significantly reduced or completely absorbed during the rolling process.

Another advantageous embodiment, which is particularly advantageous for large pipes with a smaller diameter (e.g. smaller than 20 cm or 18 cm inner diameter) for the stable design of the rolling head, consists in the piston / cylinder arrangement having two axially spaced apart, each comprises piston / cylinder units acting radially in the x direction and that the pressure roller and optionally at least one support roller of the support unit is / are arranged between the two piston / cylinder units.

One embodiment that is advantageous for the function consists in the fact that the support unit has at least one support roller that acts directly on the inside of the large pipe when rolling against the pressing force of the pressure roller.

It is noted that the design features relating to the rotating drive are not necessarily associated with the design of the piston / cylinder arrangement and can also be used in conjunction with a differently designed force application unit in the rolling head. The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawings. Show it:

1A shows a schematic view of a rolling device when used in a large pipe in an axial plan view (x-y plane),

1B shows a schematic view of a rolling device when used in a large pipe in the longitudinal direction (x-z plane),

2A and 2B are a perspective side view of a portion of the roll-on device with drive motor and roll-on head coupled to it (FIG. 2A) and the roll-on head in an enlarged view A (FIG. 2B), FIG. 3 essential components of a hydraulic system of the roll-on device of FIG. 2A,

4A and 4B show a side, partially sectioned view of the hydraulic system according to FIG. 3 (FIG. 4A) and a cross section of a piston / cylinder unit with connection lines running along a sectional plane A-A,

5 shows a pressure roller with bearing elements in a perspective side view and

6 shows a support roller in an axial plan view (left illustration) and in a side view (right illustration. 1A and 1B show in an axial plan view (Fig. 1A) and in an open side view (Fig. 1B) in a large pipe to be formed with an inner coating, a coating device with a rolling tool 2, which has a rolling head 20 and one coupled to it Has drive unit 3. The drive unit is in turn coupled to a feed rod 40 of a feed unit 4 (not shown in full).

The large pipe is formed from a pipe unit 1 which comprises a metallic outer pipe 10 as a carrier layer and a metallic inner pipe 11 introduced into its interior to form a support layer (inliner, liner). The inner tube 11 is relatively thin-walled in comparison to the outer tube 10, in order to form the support layer on the inside of the carrier layer in a force-locking manner by means of a rolling-in process and in this way to obtain a large tube with a stable inner coating. According to WO 2016/142162 A1 mentioned above, the term large pipe should be understood to mean pipes with diameters of at least 150 mm and a total wall thickness of at least 5 mm, the thickness of the carrier layer being a multiple of the thickness of the support layer. The material properties of the support layer are selected in such a way that they withstand mechanical, physical and / or chemical effects of an item to be conveyed as robustly and permanently as possible. To this end, it is of considerable advantage if the choice of material is restricted as little as possible by the manufacturing process, which is achieved by the rolling or rolling process for forming the overlay layer.

As shown schematically in FIGS. 1A and 1B, a pressure roller 21, which has a smaller diameter than the diameter of the inner tube 11, is pressed with a sufficiently large pressing force radially in the x direction against the inner surface of the inner tube 11 during the rolling-in process and thereby by means of a the support unit 220, which counteracts the pressure force diametrically, is supported with at least one support roller 22 directly on the inside of the inner tube 11. The pressure roller 21 is in a nem pressure section 214 of the rolling head 20 rotatably mounted and rolls during the rolling process while rotating the rolling head 20 on the inside of the inner tube 11 in the direction of rotation, the rolling head 20 being driven in rotation by means of a drive motor 30 of the drive unit 3 and at the same time by means of the feed unit 4 in the axial direction ( z-direction) of the large pipe or in the direction of the axis of rotation of the rolling tool 2 is advanced. The basic procedure for this rolling-in process is set out in WO 2016/142162 A1. The feed speed is matched to the speed of rotation when the pressure roller 21 rolls on the inside of the inner tube 11 and is selected so that the strip of at least the next plastically deformed strip, which is plastically deformed during one revolution by means of the pressure roller 20 and revolves in a helical shape with a slight slope, is also helically shaped circumferential strip is overlapped and so on until the support layer is rolled over the desired length in the outer tube 10. As a result of the at least one simple overlap of the circumferential plastically deformed strips, a practically very smooth structure of the inner surface of the overlay layer is obtained.

The pressure roller 21 is rotatably mounted in the pressure section 214 by means of a pressure roller axle 211, and the at least one support roller 22 is rotatably mounted in a support bearing part of the rolling head 20 by means of a support roller axle 222. A force application unit, which is designed as a piston / cylinder arrangement (described in more detail below), is arranged between the pressing section 214 and the support unit 220. The rolling head 20 has a rolling housing 200 with a housing base 201 in which the support unit 220 is formed, and a housing attachment 202 in which the pressing section 214 is formed.

On the drive side, the rolling head 20 is connected to the drive unit 3 via a coupling section 27 which is non-rotatably attached to the rolling housing 200, in particular to the housing base 201, a drive shaft of the drive motor 30 preferably via a gear 31 (cf. Fig. 2A). with the coupling section 27 is bound. A motor housing 32 of the drive unit 3 is attached to the feed rod 40 so that it rotates relative to the large pipe. For support inside the large pipe, the motor housing 32 is surrounded by a smoothly sliding support ring 33, preferably made of plastic, the outer diameter of which is adapted to the inner diameter of the inner pipe 11 so that axial advancement with simple sliding movement is ensured.

In the direction of the pressing force acting on the pressure roller 21, the rolling head 20 is provided with an x-guide 260 which is arranged between the housing base 201 and the housing attachment 202. The x-guide 260 is advantageously arranged in wall sections of the housing base 201 and the housing attachment 202 that run parallel to each other and at right angles to the axis of rotation (z-direction), preferably on the inside of a front wall section of the housing base (on the side facing away from the drive unit 3) 201 on the one hand and on the inside of a rear wall section of the housing base 201 (on the side facing the drive unit 3) on the other hand. The x-guide 260 has, on the one hand, on the housing base 201 and, on the other hand, on an adjacent wall region of the housing attachment 202, complementary guide parts that are slidably mounted one inside the other.

In the coupling section 27, preferably in the transition area between the housing base 201 and the coupling section 27, a y-guide 261 is also arranged radially, but perpendicular to the x-guide, on the one hand on the facing side of the housing base 201 or on an intermediate piece attached to it and on the other hand, on the facing side of the coupling section 27, it has complementary sliding sections that are slidably supported one inside the other. In addition to the axial guidance of the roll-on tool 2 in the z-direction, a sliding bearing or guidance of the roll-on head 20 in the radial plane perpendicular to the z-direction in the x-direction, ie in the direction of the pressing force, and the y-direction perpendicular to it is thus achieved received, so a total of three mutually perpendicular Spatial directions. The floating mounting of the rolling head 20 in the xy plane that is formed in this way results in a radial self-adjustment of the rolling head 20 in the tube unit 1 that is reliably effective during the rolling-in process and thus contributes significantly to the exertion of a uniform pressing force of the pressure roller 21 during the entire rotation and over the entire feed path at, even if the inner circumference of the large pipe has irregularities, which is usually the case. The uniform pressing force in turn results in a stable application of the support layer on the inside of the outer tube 10 over the entire rolling area.

As FIG. 1B further shows, on the (front) end face of the rolling head 20 facing away from the drive unit 3, a pressure compensation container 24 is attached, in particular connected to it in a rotationally fixed manner. The pressure equalization container 24 serves to equalize the pressure of the rolling pressure prevailing in the piston / cylinder arrangement 23 and thus to maintain a predetermined pressing force of the pressure roller 21, as will be described in more detail below.

2A and 2B show more details of the rolling tool 2 with the rolling head 20 and the drive unit 3, with FIG. 2B showing the rolling head 20 shown in FIG. 2A in an enlarged view, partially sectioned in the area of a piston / cylinder unit 230 of the piston - / cylinder arrangement 23 (see. Also Fig. 3, 4A and 4B) reproduces. 2A and 2B also show sections of a line arrangement 25 with line sections guided along the rolling tool 2 and connected to the piston / cylinder arrangement 23 for supplying hydraulic fluid, in particular hydraulic fluid or hydraulic oil. The pressure compensation container 24, its mechanical attachment to the rolling head 20 and connection means for connecting the pressure compensation container 24 to the line arrangement 25 are also shown. Furthermore, the coupling section 27 and the coupling of the rolling head 20 or the coupling section 27 via the gear 31 to the drive motor 30 can be seen. The bearing of the pressure roller 21 in the area of its pivot bearing 210 in the housing attachment 202, which is supported by a bearing section in FIG a housing cover part 203 is supplemented, which is stably mounted on the housing attachment 202. The pressure roller 21 protrudes through a slot-like cutout from the housing attachment 202, in particular the housing cover part 203, radially outward with a rolling surface and has in the pivot bearing 210 stably mounted, on both sides in the direction of the axis of rotation (z-direction) protruding sections of a, preferably molded, pressure roller axle 211 on.

In the present case, the x-guide 260 has guides with linear bearings or circulating roller units or, alternatively, can e.g. B. on the one hand sliding grooves and on the other hand complementary in this engaging slide rails, z. B. have a dovetail cross-section. Similarly, the y-guide in the present case also has guides with linear bearings or recirculating roller units or, alternatively, can e.g. B. on the one hand slide grooves and on the other hand complementary in these engaging slide rails, the x-guide and the y-guide, for example, each comprise two parallel units of slide rail and slide groove or rolling elements, which results in a high stability of the guide under floating mounting results, wherein the deflection is limited so that required deflection areas are included.

The motor housing 32 surrounds with its the rolling head 20 facing front portion of the drive unit 3 facing rear portion of the Koppelab section 27, which is rotatably mounted in the front portion of the motor housing 32. The rolling head 20 can thus be rotated about a stable axis of rotation in the tube unit 1 via a drive shaft driven in rotation by the drive motor 30, in particular via the gear 31, the pressure roller 21 with the required pressure force on the inside of the inner tube 11 with plastic deformation of the same for Forming the overlay layer unrolls. The feed rod 40 is rigidly attached to the end section of the motor housing 32 facing away from the rolling head 20, in particular to the front end thereof, and with its end facing away from the drive unit 3, preferably outside the large pipe, with a (not shown) feed device connected. Alternatively, the large pipe can also be moved axially relative to the rolling tool 2 in order to generate the feed.

As FIGS. 2A and 2B further show, the sections of the line arrangement 25 connected to the rotatable rolling head 20 and the coupling section 27 and connected to the piston / cylinder arrangement 23 are via a rotary leadthrough 253 with non-rotating sections of the Line arrangement 25 connected in a fluid-conducting manner. For this purpose, in a transition area between the rotating coupling section 27 and the adjoining stationary part of the drive unit 3, associated circumferential channel sections are brought into connections that communicate with one another and are sealed to the outside, even during the rotation, so that a trouble-free passage of the hydraulic fluid from a connected feed pump or pump. a reservoir providing the hydraulic fluid to the piston / cylinder arrangement 23 and optionally back from the piston / cylinder arrangement 23 is guaranteed.

As FIGS. 2A and 2B also show and in particular FIGS. 3 and 4A show, the piston / cylinder arrangement 23 in the present case has two piston / cylinder units 230, 231 which are axially in the direction of the axis of rotation (z-direction) are spaced apart and between which the pressure roller 21 and the (at least one) support roller 22 are arranged, wherein z. B. two support rollers 22 can be offset in the circumferential direction at the same angle with respect to a diagonal running centrally through the pressure roller 21 in the same cross-sectional plane. The at least one support roller 22 is supported with its support roller axis 222 in the support bearing part 221 and protrudes through a corresponding gap from the roll-on housing 200 or the housing base 201 to such an extent that it rolls unhindered on the inner surface of the inner tube 11 during the rolling-on process. The support roller 22 is advantageous for. B. mounted on the support roller axle 222 via at least one support roller bearing 223 (see. Fig. 6). By means of the piston / cylinder arrangement 23, the pressure section 214 with the housing attachment 202 and the housing cover part 203 and the pressure roller 21, which is rotatably mounted in it, is applied against the support unit 220 with the pressure force required for the rolling process or the plastic deformation of the inner tube 11. In the exemplary embodiment shown, each piston / cylinder unit 230, 231 is designed as a double-stroke piston / cylinder unit, for example each with a round block cylinder. The hydraulic fluid is fed into a flow-side hydraulic chamber via a common flow line 250 and hydraulic fluid displaced from a return-side cylinder chamber is returned to a common return line 251 via line sections connected to it, as can be seen in more detail in FIGS. 3, 4A and 4B. This design with the double-stroke piston / cylinder units results in a compact, stable design of the rolling head 20 with a reliable, easily controllable or regulatable function, in particular easily controllable or controllable pressing force over the entire rolling area even with irregularities in the large pipe. Alternatively, a version with just one double-stroke piston / cylinder unit is also possible.

As can be seen in detail in FIGS. 3 and 4A, the pressure equalization tank 24 is connected to the line arrangement 25, in this case the supply line 250, via an associated line section, so that the supply-side cylinder space of the piston / cylinder arrangement 23 with a hydraulic fluid receiving area 241 of the Pressure compensation tank 24 is communicatingly connected. The hydraulic fluid receiving space 241 is separated by means of a fluid-tight membrane from a gas pressure space area 240 formed in the pressure equalization container 24, which is kept under a predetermined gas pressure (preferably nitrogen). In this way, even when the volume of the hydraulic fluid in the hydraulic cylinder fluctuates, for example as a result of out-of-roundness in the large pipe, volume compensation is always ensured with the pressure of the hydraulic fluid remaining the same, and thus also a constant pressure of the pressure roller 21 or a constant pressure force acting on the inside of the inner tube 11 during the rolling process, regardless of out-of-roundness or similar influences.

As FIG. 3 further shows, the line arrangement 25 can be provided with a cooling air line 252 in addition to the hydraulic fluid line in order to effect cooling of the rolling tool 2 or the relevant area of the large pipe during the rolling process. The cooling air line 252 also has a rotary leadthrough between the rotating section of the rolling tool 2 and the stationary section of the rolling tool 2, in particular in the area between the drive shaft and the motor housing 32 or between relevant adjacent rotating and stationary parts in the transition area between the drive unit 3 and the coupling section 27, as stated above in connection with the supply and discharge of the hydraulic fluid.

5 shows an advantageous embodiment of the pressure roller 21 with two laterally protruding sections of a pressure roller axis 211 and angular contact bearings on both sides with a self-centering arrangement. The rolling bodies on both sides have bearing halves that are directed towards one another at an angle with an increasing circumference with respect to a central longitudinal plane. The angular contact bearings are inserted into correspondingly adapted bearing surfaces formed in the housing attachment 202 and the housing cover part 203 and result in a secure, stable position when rolling on with an axial advance. The rolling surface of the pressure roller 21 is designed in a special way so that it is parallel in a central, radially furthest protruding circumferential area with respect to the axis of rotation over a width of z. B. 2 to 6 mm runs (flat 212) and then on both sides at a small angle of less than 20 ° or less than 10 ° obliquely (bevel 213) or rounded outwards over a range of z. B. 1 to 3 cm and then laterally (passing over curves) into steep flanks (side areas) at an angle between 50 ° and 90 ° with respect to the axial direction and then merges into the lateral axis sections. Here is the pressure roller 21 radially symmetrical in an axial plan view and, for example, also configured symmetrically with respect to the axial extent with respect to a central transverse plane. The bevel 213 or rounding that adjoins the flattened area 212 is adapted in such a way that, during the advance, there is a safe run-in from the already pressed (plastically deformed) area of the inner tube 11 or the support layer into the area of the inner tube 11 that is to be pressed or completely pressed . For this purpose, the difference in height (radial distance) between the flat 212 and the transition between the bevel 213 in the subsequent steep lateral flank is preferably somewhat greater than the molding depth during the rolling process. The pressure roller 21 formed in this way and mounted in the housing attachment 202 of the rolling head 20 contributes significantly to an exactly controllable or regulatable rolling process under pressure force adapted to the material of the inner tube 11 and the geometry of the large tube and under control or regulation of the feed and rotary movement.

6 shows an advantageous embodiment of the support roller 22 6 shows, clearly (for example, at least twice) larger than the rolling surface or contact surface of the pressure roller 21, so that stable support on the inner surface of the inner tube 11 is ensured during the rolling-in process. The support surface 24 has a flat shape in its axial extension and runs parallel to the axis of rotation of the support roller 22 or the rolling head or has a rounding with a very large radius in the axial direction, so that the significantly larger axially extended support surface 224 results compared to the rolling surface . In the feed direction, the support surface 224 tapers in an edge area that comprises about a third or a quarter or less of the entire axial extent of the support roller 22, continuously over a bevel 225 (conical section-shaped or conical) or over a slight curve in order to get into the (first) side surface of the support roller 22 on the feed side (preferably with a small radius of curvature), whereby the feed rate when the inner tube 11 rolls on becomes cheap †. The (second) side surface of the support roller 22 facing away from the feed side merges directly via a rounding (with a small radius of curvature) into the second side surface remote from the feed side surface. Both side surfaces of the support roller 22 are, for example, flat and oriented orthogonally to the axis of rotation of the support roller 22. For stable mounting on the support roller axis 222, the support roller 22 is provided with two support roller bearings 222 (support roller roller bearings or support roller ball bearings) arranged axially next to one another.

The measures mentioned, which go beyond the device according to WO 2016/142162 A1 mentioned at the beginning, lead to a significant optimization of the curling process as a result of exact control or regulation of the pressure force and the rolling processes and thus also to a significant improvement in the coating quality.

Claims

Expectations

1. Roll-on device for applying a support layer (11) on the inside of a carrier layer (10) of a large metal pipe by means of a pressure roller (21), which is rotatable and by means of a controlled or regulated, a piston / cylinder arrangement (23) having a force application unit under Applying a pressing force adjustable radially in the x-direction is supported in a pressing section (214) of a rotatable rolling head (20) and is supported against the inside of the large pipe by means of a support unit (220) present in this when the supporting layer (11) is rolled on, characterized in that that the piston / cylinder arrangement (23) comprising at least one piston / cylinder unit (230, 231) is connected to a hydraulic fluid, in particular hydraulic fluid, via a line arrangement (25) which has a flow line (250) and a return line (251) , containing reservoir is connected, the hydraulic fluid by means of a control or a Reg treatment device can be fed to or removed from the piston / cylinder arrangement (23) while maintaining a predetermined pressing force.

2. Rolling device according to claim 1, characterized in that the at least one piston / cylinder unit (230, 231) is designed as a double-stroke piston / cylinder unit with two reciprocating pistons, one of which over the pressing section (214) of the rolling head (20) is coupled to the pressure roller (21) and the other is coupled to the support unit (220).

3. Rolling device according to claim 2, characterized in that on the input side between the two reciprocating pistons of the respective piston / cylinder unit (230, 231) a common feed line (250) and from the input side of the two reciprocating pistons of the respective piston / cylinder unit (230, 231) Connections are led to a common return line (251).

4. Rolling device according to one of the preceding claims, characterized in that when two piston / cylinder units (230, 231) are present, both are connected to a common flow line (250) and a common return line (251).

5. Rolling device according to one of the preceding claims, characterized in that the piston / cylinder arrangement (23), in particular on the supply side, is fluid-conducting to a pressure compensation container (24) for varying the fluid volume in the piston / cylinder arrangement (23) with constant fluid pressure and thus constant predetermined pressing force is connected, wherein in the pressure equalization container (24) a fluid-receiving space area (241) is separated by means of a flexible partition in a fluid-tight manner from a gas pressure space area (240) under a predetermined pressure.

6. Rolling device according to claim 5, characterized in that the piston / cylinder arrangement (23) is connected to the pressure compensation tank (24) via the line arrangement (25), in particular the feed line (250).

7. Rolling device according to claim 5 or 6, characterized in that the pressure equalization container (24) is rotatably attached to the rolling head (20) with this.

8. rolling device according to one of the preceding claims, characterized in that the rolling head (20) via a coupling section (27) rotatable, in particular via a gear (31), is connected to a drive shaft of a drive motor (30) which is connected to a The motor housing (32), which is non-rotatable with respect to the large pipe, is attached to a feed rod (40) which is also non-rotatable with respect to the large pipe and extends in the z-direction, via which the drive motor (30) with the coupling section (27) and the rolling head (20) in the large pipe can be advanced axially.

9. rolling device according to claim 8, characterized in that the flow line (250) and the return line (251) are guided via a rotary feedthrough (253) between the rolling head (20) and the motor housing (32).

10. Rolling device according to claim 8 or 9, that the motor housing (32) is provided with a circumferential support ring (33), by means of which it can be axially displaceably supported in the interior of the large pipe under sliding friction.

11. Rolling device according to one of claims 8 to 10, characterized in that the coupling section (27) is provided with a sliding bearing which is designed as a y-guide radially to the axis of the feed rod (40) and at right angles to the x-direction.

12. Rolling device according to one of the preceding claims, characterized in that the pressure roller (21) is shaped radially symmetrically in an axial plan view and has a flat, axially parallel rolling section on its outer, circular in cross-section circumferential surface in an axially extending central longitudinal plane, which in longitudinal section - preferably on both sides - Rounded over the entire circumferential surface at a small angle less than 20 ° with respect to the direction of the axis of rotation or sloping down to a smaller radius and on both sides - preferably rounded - merges into side areas steeply sloping at a side angle between 70 ° and 90 °, which are axially extending on both sides Axle sections run out.

13. Rolling device according to one of the preceding claims, characterized in that the rolling head (20) has a rolling housing (200) with a housing base (201) which comprises the support unit (220), and with a housing attachment (202) that has the Comprises pressing section (214), and that the housing base (201) and the housing attachment (202) are provided with complementary, slidingly nested sections of a sliding guide designed as an x-guide.

14. Rolling device according to one of the preceding claims, characterized in that the piston / cylinder arrangement (23) comprises two axially spaced apart piston / cylinder units (230, 231) each acting radially in the x direction and that the pressure roller ( 21) is arranged between the two piston / cylinder units (230, 231).

15. Rolling device according to one of the preceding claims, characterized in that the support unit (220) has at least one support roller (22) which acts directly on the inside of the large pipe against the pressing force of the pressure roller (21) when rolling.