Winding mandrel in a winding device for the production of a lining hose for lining channels and pipelines

Abstract

A winding mandrel (1) in a winding device for producing a lining tube (2) for lining channels and pipelines, which has an inner foil tube (4) and a layer of at least one overlapping wound fiber tape (6) impregnated with a liquid reaction resin arranged thereon, with a base body (8) on which at least two guide devices (10, 12) are received, each comprising an endlessly circulating belt (14, 16) over which the inner foil tube (4) is moved in a feed direction (A), characterized in that the first guide device (10) is fixedly coupled to the base body (8), and that the circulating belt (16) of the second guide device (12) is movable in a plane perpendicular to the feed direction (A) and is pushed away from the top of the base body (8) by pressure means (18; 118) with a constant force.

Description

[0001] The invention relates to a winding dome in a winding device for producing a lining tube for lining channels according to the preamble of claim 1.

[0002] In the field of trenchless rehabilitation of defective sewer systems, lining tubes are increasingly used, which are referred to as "liners" and consist of a fibrous material, in particular fiberglass fabric, which is impregnated with a liquid reactive resin, which, after the lining tube is pulled into a sewer to be rehabilitated and expanded with the help of compressed air, is hardened by light from a radiation source.

[0003] Such a lining hose, as well as a method and a device for manufacturing such a hose, are known, for example, from DE 198 23 714 C2, DE 10 2013 014 796 A1 and DE 10 2010 018 479 A1.

[0004] The lining tube is manufactured by winding resin-impregnated fiber tapes in a winding device, overlapping them, onto an inner foil tube that is permeable to UV light. This inner foil tube is first mounted on a cantilevered support tube, at the end of which is a winding mandrel over which the inner foil tube is moved during the winding process. The winding mandrel has two or more guide devices in the form of circulating belts that can be moved radially relative to each other to adjust the diameter of the lining tube to a desired duct diameter.

[0005] This presents a problem: the inner film tubes, which are usually seamless and onto which the fiber tapes are wound, can have manufacturing-related circumferential tolerances of, for example, up to ± 14 mm. The winding mandrel, over which the inner film tube is guided during the production of the lining tube, must, however, have a diameter that ensures the film is neither too tight nor too loose on the circulating belt.

[0006] Another problem in this context is that the diameter of the winding mandrel is only adjustable when the mandrel is exposed, i.e., before production begins; however, the selected diameter setting cannot be changed during subsequent production. Manufacturing tolerances in the film diameter thus lead to a more or less accurate adaptation of the winding mandrel to the actual film diameter. If the winding mandrel is larger than the film, the film will be excessively stretched. If the winding mandrel is smaller than the film, the film will not be held securely enough and may shift.

[0007] In practice, this leads to tensions arising in the inner foil tube, which can sometimes cause wrinkles that adversely affect the strength of the lining tube after curing in a sewer being rehabilitated.

[0008] Accordingly, it is an object of the present invention to avoid mechanical stress differences and associated wrinkles of the inner film tube caused by manufacturing-related diameter tolerances of the film of the inner film tube during the manufacture of the lining tube.

[0009] This problem is solved according to the invention by a winding mandrel having the features of claim 1.

[0010] Further features of the invention are contained in the dependent claims.

[0011] According to the invention, one, or in the case of large winding mandrels for lining tubes with standard diameters (DN) of more than 600 mm, two, belts of the winding mandrel are spring-mounted. The tension on the inner film tube in the radial direction, i.e., in the direction transverse to the feed direction, thus remains essentially constant even if the diameter of the inner film tube changes due to manufacturing processes. In other words, the diameter of the winding mandrel automatically readjusts itself during ongoing production, so that the film, despite its manufacturing-related diameter tolerances, always exhibits essentially the same tension before and during the winding of the fiber tapes onto the inner film tube.

[0012] As the applicant has found in this context, although the diameter of the wound liner is changed to the same extent as the diameter of the film by compensating for manufacturing-related diameter changes, such fluctuations in the standard diameter (DN) of the liner do not cause any problems in practice when setting it up and curing it.

[0013] The suspension of the belt(s) can be achieved in different ways, e.g. with the help of pressure means, which are designed as pneumatic cylinders, preferably bellows cylinders, or as mechanical springs, e.g. gas springs or spiral springs, which have a comparatively small spring constant and are pre-tensioned to generate the required pressure forces in order to produce a force that is as independent of the path as possible and essentially constant.

[0014] The invention is described below with reference to the drawings and by way of preferred embodiments.

[0015] The drawings show: Fig. 1 A schematic side view of a winding device with a winding dome according to the invention during the production of a lining tube, Fig. 2 a schematic detail view of a first embodiment of the invention, in which the pressure means are designed as pneumatic spring elements connected to a compressed air source, Fig. 3 a schematic side detail view of a second embodiment of the invention, in which the pressure means are designed as gas springs, Fig. 4 a schematic representation of a further embodiment of the invention, in which the pressure means are designed as an actuator which moves the belts together via a central adjusting device in a radial direction depending on the signals of a pressure sensor in order to keep the circumferential tension in the inner film tube essentially constant during production, and Fig. 5 a schematic representation of a further embodiment of the invention, in which the force of the pressure means is provided by the own weight of the second guide device, which is movably and suspended from the base body.

[0016] As in Fig. As shown in Figure 1, a winding dome 1 in a winding device for producing a lining tube 2 for lining ducts and pipelines comprises a base body 8, preferably attached to a cantilevered support tube (not shown in detail), on which at least two guide devices 10, 12 are mounted, each having an endlessly circulating belt 14, 16. An inner foil tube 4 is moved in a known manner in a feed direction A by means of pull rollers 5 via the belts 14, 16, which are preferably driven by a motor (not shown in detail). At least one fiber tape 6, impregnated with liquid reaction resin, is wound onto the inner foil tube by an overlapping winding body, which is not shown in detail in the figures for illustrative reasons.

[0017] In the Fig. In the embodiments of the invention shown in Figures 1 to 3, the first guide device 10 is fixedly coupled to the base body 8, and the circulating belt 16 of the second guide device 12 is movable in a plane perpendicular to the feed direction A and is pushed away from the top of the base body 8 by pressure means 18, 118 with a preferably essentially constant force in order to generate a tension in the inner film tube that is as constant as possible. "Fixedly coupled to the frame" here means that the respective elements are firmly connected to the base body 8 during production and cannot move in the radial direction.

[0018] This is done in the Fig. 2 and Fig. In the embodiment of the invention shown in Figure 3, the endlessly rotating belt 16 of the second guide device 12 is guided over a first and a second deflection roller 16a, 16b, which are mounted on a common support body 20, on which the pressure means 18, 118 act. In order to obtain the smoothest possible rotation of the belts 14, 16, they can run on rollers not specified in detail, which are freely rotatable on the support body 20 and are preferably designed as ball bearings.

[0019] In order to allow movement of the common support body 20 relative to the base body 8 in a radial direction, i.e. away from the center of the base body 8, without moving the support body 20 with the belts mounted on it in the longitudinal direction of the support body, a preferably Fig. 1. A schematically indicated guide, in particular a linear guide 22, is provided, which may, for example, comprise a frame-mounted rod-shaped element that is guided in a sleeve-shaped element attached to or formed in the support body 20, e.g., a through-hole formed in the support body 20. This opens up the possibility of driving the belt 16 of the second guide device 12 in the same way as the belt 14 of the first frame-mounted guide device 10, if desired, by a drive motor not shown in detail.

[0020] As further described in the presentations of the Fig. 2 and Fig. As shown in Figure 3, according to a further embodiment of the invention, the support body 20 can be supported on a second base support body 24 via the pressure means 18; 118. This second base support body is movable relative to the base body 8 in a direction perpendicular to the feed direction (A) of the lining tube 2, via an adjustment device 26, in particular a manually or motor-operated central spindle drive, to adapt the diameter of the winding mandrel 1 to different standard diameters of the inner film tube 4. This offers the advantage that the diameter of the winding mandrel according to the invention can be adjusted to a new standard diameter in a very short time before a production order.

[0021] In the embodiments of the invention described above, the carrier body 20 can be - as in Fig. 2 and Fig. Figure 3 shows a stop 28 that limits the movement of the carrier body 20 away from the outside of the base body 8. This ensures that the belt 16 moves radially only within a preferred range of motion in which the pressure means generate a substantially constant pressure force.

[0022] According to a further concept underlying the invention, in the embodiment described above, a limit switch and / or a position sensor 30 is arranged at the stop 28, the actuation of which generates a warning signal and / or a control signal, depending on which an actuator 32, for example an electric actuator motor or a pneumatic cylinder, is activated, which acts in particular on the base support body 24 in order to move the first and second guide devices 10, 12, or, in the case of winding mandrels with a large diameter, also further guide devices, together relative to each other.

[0023] In the preferred, in Fig. In the embodiment of the invention shown in Figure 2, the pressure means comprise at least one pneumatic spring element 18, in particular a bellows cylinder or a compressed air cylinder, which is connected to a compressed air source 34, preferably arranged inside the base body 8. Several such pneumatic spring elements 18 are preferably arranged along the length of the base body 8, of which in Fig. For the sake of simplicity, only two elements are shown. By increasing or decreasing the air pressure in the compressed air source 34, which in the simplest case can be done via a valve (not shown) and a compressed air compressor, the contact force exerted by the bellows cylinders or compressed air cylinders 18 on the circulating belt 16 of the second guide device 12 can be increased or decreased to a desired value.

[0024] To increase or decrease the pressure on the inner film tube 4 as needed during ongoing production, for example to compensate for temperature fluctuations in the production facility, a heating device, in particular an electric heating device, such as an ohmic resistance heater, is preferably arranged in the compressed air source 34. This heating device allows the temperature of the compressed air stored in the compressed air source 34 to be changed. In the case of an electric heating device, the temperature can also be regulated to a constant value by a temperature control device (not shown in detail), so that the pressure – and thus the tension of the inner film tube 4 in the circumferential direction – always has a predetermined, well-defined value during ongoing production.

[0025] According to a further embodiment of the invention, which is particularly advantageous for use in purely mechanically actuated, non-driven winding mandrels 1, the pressure means comprise at least one mechanical spring 118 having a spring characteristic that is essentially independent of displacement. Such a pressure force can be obtained, for example, by a gas spring, a disc spring, or a highly pre-tensioned coil spring with a comparatively low spring constant, whereby in this case it must be assumed that the pressure force is only essentially constant, since the aforementioned mechanical springs always exhibit a certain displacement dependency in practice.

[0026] According to a further concept underlying the invention, the essentially constant contact force on the second belt 16 can be generated by the fact that the second guide device 12 is in a linear guide or also a pivoting guide - as in Fig. 5 indicated - suspended from the underside of the base body 8. The essentially constant contact force of the contact elements is generated by the weight of the second guide device 12, which can be increased or decreased by removing or adding additional weights.

[0027] In the embodiment described last, as well as in the embodiments described previously, it is further advantageous if the movement of the belt 16 of the second guide device 12 is damped by a damping element 36 that acts between the base body 8 and the second guide device 12. In the embodiment described in Fig. In the embodiment of the invention shown in Figure 5, the damping element comprises an oil pressure damper or a gas pressure damper 36, or in the simplest case an air bellows provided with openings, which is preferably attached with one end to the base support body 24 and with the other end to the support body 20.

[0028] Finally, according to a further alternative embodiment of the invention, a first and second guide device 210, 212 can be received on the base body 8 of the winding mandrel 1, both of which are mechanically coupled to each other via a central adjusting device 200 received on the base body 8, which moves the belts 214, 216 of the first and second guide devices 210, 212 together by the same travel distance in a radial direction away from or towards the surface of the base body 8, as shown in Fig. Figure 4 shows that the pressure means in this embodiment comprise an actuator 218, e.g., an electric motor and a corresponding gearbox, or a pneumatic or hydraulic cylinder, which actuates the central adjusting device 200, symbolized by a central gear and the racks engaging with it, depending on the signals from a pressure sensor 220, such that the two belts 214, 216 of the guide devices 210, 212 are pressed against the inside of the inner film tube 4 with a substantially constant pressure force. The pressure sensor 220 can, for example, be a spring-loaded impeller or a spring-loaded sliding finger contacting the inside of the inner film tube 4, which—as shown—can be attached to the base body 8 or to the support body 20 of a guide device 210, 212, and whose deflection is detected by an electronic transmitter.Depending on the signals from the pressure sensor 220, the actuator 218 is actuated during production operation such that the adjusting device 200 moves the first and second guide devices 210, 212 radially inwards when the deflection of the pressure sensor 220 is too small, and vice versa. The electrically actuated components, such as the actuator and the pressure sensor, as well as, if applicable, the control electronics housed inside the winding mandrel 1, can advantageously be supplied via a battery or by inductive coupling of the electrical energy from an external source. List of reference symbols 1 winding mandrel 2 Lining hose 4 inner foil tubes 5 traction rollers 6 fiber tape 8 basic shapes 10 first guidance facility 12 second command facility 14 belts of the first guide device 16 belts of the second guide device 16a first deflection pulley 16b second pulley 18 pressure plates 20 carrier bodies 22 Leadership 24 Base carrier bodies 26 Adjustment device for changing the standard diameter 28 stops 30 Position sensor 32 Actuator 34 Compressed air source 36 damping element 118 mechanical spring 200 Adjustment device for jointly extending the guide devices 210 first guide device of the embodiment of Fig. 4 212 second guide device of the embodiment of Fig. 4 214 first belt 216 second belt 218 Actuator 220 pressure sensor A Feed direction

Claims

[1] Winding mandrel (1) in a winding device for producing a lining tube (2) for lining ducts and pipelines, which has an inner foil tube (4) and a layer of at least one overlapping wound fiber tape (6) impregnated with a liquid reaction resin arranged thereon, with a base body (8) on which at least two guide devices (10, 12) are received, each comprising an endlessly circulating belt (14, 16) over which the inner foil tube (4) is moved in a feed direction (A), characterized by , that the first guide device (10) is fixedly coupled to the base body (8), and that the circulating belt (16) of the second guide device (12) is movable in a plane perpendicular to the feed direction (A) and is pushed away from the top of the base body (8) by pressure means (18; 118) with a constant force. [2] Winding mandrel according to claim 1, characterized by , that the endlessly rotating belt (16) of the second guide device (12) is guided over a first and a second deflection roller (16a, 16b) which are mounted on a common support body (20) on which the pressure means (18; 118) act. [3] Winding mandrel according to claim 2, characterized by , that the common support body (20) is guided in a guide (22), in particular a linear guide (22), so as to be movable in the radial direction relative to the base body (8). [4] Winding mandrel according to claim 2 or 3, characterized by, that the carrier body (20) is supported via the pressure means (18; 118) on a second base carrier body (24), which is movable in a direction perpendicular to the feed direction (A) of the lining tube (2) relative to the base body (8) in order to adapt the diameter of the winding mandrel (1) to different standard diameters of the inner film tube (4) via an adjustment device (26), in particular via a spindle drive (26). [5] Winding mandrel according to one of claims 2 to 4, characterized by , that a stop (28) is assigned to the carrier body (20), which limits the movement of the carrier body (20) away from the outside of the base body (8). [6] Winding mandrel according to any one of claims 1 to 5, characterized by, that the stop (28) is assigned a limit switch and / or a position sensor (30), when actuated a warning signal is issued and / or a control signal is generated, depending on which an actuator (32) is activated to radially move apart or together the first and second guide device (10, 12) or further guide devices. [7] Winding mandrel according to one of the preceding claims, characterized by that the pressure means comprise at least one pneumatic spring element (18), in particular a bellows cylinder (18) or a compressed air cylinder (18), which can be connected to a compressed air source (34) preferably arranged inside the base body (8). [8] Winding mandrel according to claim 7, characterized by, that a heating device, in particular an electric heating device, is associated with the compressed air source (34) by means of which the temperature of the compressed air stored in the compressed air source (34) can be changed. [9] Winding mandrel according to any one of claims 1 to 6, characterized by that the pressure means comprise at least one mechanical spring (118) with a spring characteristic that is essentially independent of the path, in particular a gas spring (118), a disc spring (118) or a pre-tensioned coil spring. [10] Winding mandrel according to any one of claims 1 to 5, characterized by , that the second guide device (12) is suspended from the underside of the base body (8) and the essentially constant force of the pressure means is provided by the weight of the second guide device (12). [11] Winding mandrel according to one of the preceding claims, characterized by, that a damping element (36) is provided to dampen the movement of the second guide device (12), which acts between the base body (8) and the second guide device (12). [12] Winding mandrel (1) in a winding device for producing a lining tube (2) for lining ducts and pipelines, which has an inner foil tube (4) and a layer of at least one overlapping wound fiber tape (6) impregnated with a liquid reaction resin arranged thereon, with a base body (8) on which at least two guide devices (210, 212) are accommodated, each comprising an endlessly circulating belt (214, 216) over which the inner foil tube (4) is moved in a feed direction (A), characterized by, that the first and second guide devices (210, 212) are mechanically coupled to each other via a central adjusting device (200) mounted on the base body (8), which moves the belts (214, 216) of the first and second guide devices (210, 212) together by the same amount of distance in a radial direction away from the surface of the base body (8), and that pressure means comprise an actuator (218) which actuates the central adjusting device (200) depending on the signals of a pressure sensor (220) contacting the inner film tube (4) in such a way that the two belts (214, 216) of the guide devices (210, 212) are pressed against the inside of the inner film tube (4) with a constant pressure force of the same magnitude.

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