SI7511250A8 - Device for a continuous manufacturing of insulating tube coatings - Google Patents

Description

FIELD OF THE INVENTION

The technical field of the invention is the preparation for the continuous manufacture of insulating tube liners formed from fibers, in particular fiberglass. The proposed MKP classification is B 29G 005/00.

The invention relates to a device for making insulating tubular linings in a continuous manner, in particular for insulating pipelines or the like, wherein said tubular liners are formed of fibers, in particular glass fibers or other mineral fibers, between which a polymerized binder is distributed. The binder may be a phenol-formaldehyde resin, a phenol-urea resin or a phenol-melamine copolymer.

A technical problem

A technical problem solved by the invention is the manufacture of insulating tubular linings such that the felt in which the binder is distributed and which, if necessary, is fed into the drying furnace, is formed on a rotating mandrel when binder polymerization begins and then to complete said polymerization bring to a drying oven.

The object of the invention is to provide a device which, by means of a continuous production method, will allow the manufacture of a large amount of felt coverings, i.e. liners with a low specific density and high thermal insulation capability, with the specified pipe linings having a small outer diameter.

The state of the art

In the prior art preparations for insulating tubular oologues, the binder in the liner is partially polymerized, and then the t & KO partially polymerized liner is placed on the thorn of the liner into the drying chamber, where the final polling of the insulating tubular liner is performed.

Thus, e.g. known preparation for the manufacture of tubular fiberglass insulating enclosures according to AT-PS patent no. 264 881, consisting of a heat chamber having a first zone in which an endless conveyor belt is accommodated to receive a pre-impregnated fiberglass net, and optionally nozzles for further application of artificial resin to a fiberglass net, in the second thermal zone The chamber is equipped with a mandrel for winding the web of fibers, while a belt conveyor is provided in the third zone for removal of the core And the shaped body. With this known device, the cores are made of cylindrical mandrel, around which radially movable cylinders are mounted. Furthermore, a device for the manufacture of tubular hollow bodies made of fiberglass reinforced with glass fibers for winding to the core according to Austrian patent AT-PS no. 291 550, for which a web is made of fiber by means of conveyor belts and a cutting device mounted in the frame with a conveyor, at the outlet of which is provided a roller frame and in which a hinge plug is provided for receiving a hollow cylindrical core connected to a vacuum source and equipped with perforated wall. In addition, inlet and outlet assemblies are provided for empty and / or empty circuits. coiled cores And a pressure roller prltlsljlv along a speed-adjustable core, and optionally smoothing cylinders for smoothing the surface of a fiberglass hollow tubular body reinforced with fiberglass.

The aforementioned known preparations have the disadvantage that, on the one hand, they have many spikes requiring difficult maintenance and, on the other hand, that bypassing ^: - · contact with a heated spike, it is damaged, because it is very difficult, e , to rust the surface of the heated mandrel at a precisely controlled temperature.

A further disadvantage of the known preparations to date (AT-PS Nos. 264 811 and No. 291 550) is that the spines on these devices are exposed to harmful damage during the treatment of the insulating pipe linings.

For further known such preparations, a liner in which the binder is partially polymerized is removed from the mandrel and immediately after wrapping - without any further working phase to ensure workpiece measurements - is brought into the polymerization chamber. The disadvantage of such known preparations, in which the lining is immediately transferred to the polymerization chamber after wrapping - and, in the case of this subsequent smoothing of its surface on the mandrel - is that the not completely solidified tubular lining is damaged in further manipulations, causing final the product looks poor. 7 However, as long as the pipe liner is removed from the mandrel only after a longer time allowing the linings to harden, such a longer curing time slows down the production rhythm and thus reduces the production capacity of the machine.

A description of the solution to a technical problem with examples of execution and a list of images

It is an object of the present invention to eliminate the drawbacks of such known devices and to solve the problem of damaging tubular insulating glass or similar fibers which have not been satisfactorily solved in the course of their manufacture, the problem of achieving accurate measurements of the tubular linings, and the problem of damaging the thorns of the device itself. an insulating tubular lining is formed from the woens.

The object of the invention will be solved by preparing for the manufacture of insulating tubular linings in a continuous manner, in particular allowing the manufacture of tubular linings of relatively small outer diameters in which the spines are relatively thin and relatively resistant to multiple transport through the polymerization chamber.

The solution according to the invention is achieved by hardening these flaps formed in the tube lining after hardening of their inner side by rolling pressure, which also smoothes the outer surface of the insulating tube lining, after which it completely hardens without contact by the versatile flow of warm gas.

The device according to the invention comprises a rotating retractable mandrel having arranged heating. At said predetermined angle, driven rollers are arranged at predetermined angular distances, which are rotatably mounted in a bearing whose distance from the axis of the mandrel can be varied and which, when reaching a predetermined distance, move away from the mandrel by means of a spacer assembly. A heat-smoothing device is installed between the rotating fan mandrel and the polymerization chamber for final curing, which has at least one heating surface and a rolling assembly for rolling the outside of the felt cover of the insulating liner. In the polymerization chamber, a transport path existing from one straight section or more above one another is arranged substantially parallel to the straight sections, with substantially equal spaced vertically guided transverse bars, the ends of which are guided in their respective guides. The transverse bars are driven in a vertical motion in the vertical direction, moving in a coordinated oscillation in terms of maximal amplitude and periods, but the oscillations of the adjacent transverse bars are phase shifted by the same angle. In the polymerisation chamber is installed a heating assembly existing from gas burners installed near the bottom of the chamber and from the cover plate ", k: covers the burners.

In a preferred further variant embodiment of the device according to the invention, the winding assembly is made of three cylinders arranged below 120 °. The heated surface of the heating and ironing apparatus is made on a flat panel which is electrically heated to 400 ° C. Roller assembly It is mounted below the plate and consists of an endless belt conveyor with fine loops. It is also advantageous if both ends of the transverse bars are each supported by a crankshaft hinge that has several crank hinges and reel Ilc arranged at equal angular intervals. Further, the ends of the adjacent sections of the transport routes may be repositioned relative to each other, with the respective upper end ending laterally before each lower end. Finally, the vertical movement of all the transverse bars of at least one section of the transport route may be preferred, and preferably a joint drive is provided for all sections of the transport route.

According to the invention, the mandrel is heated to a temperature such that the inner side of the felt liner of the insulating tube liner which adheres to the mandrel forms a continuous solidified inner side of the liner, the shape of which is retained even after removal of the insulating liner from the mandrel, although other parts of the insulating liner are not yet in fully polymerized state. After complete curing of the inside, the insulating liner is separated from the mandrel so that it can be easily removed from the mandrel. The point is that for this purpose, a certain period of time is required, which should correspond to the one required for winding the felt or. fiberglass webbing to the thorn. In this way, the insulating liner can be removed from the mandrel at the end of the winding or shortly thereafter.

As more cylinders are arranged around the mandrel, it will be ensured that the fiberglass wrap is evenly wound to properly shape the insulating tube liner and secure it firmly on the mandrel. The heating and smoothing device ensures uniform polymerization and smoothing of the outer side of the pipe insulation liner.

The invention will be explained in greater detail on the basis of the preferred embodiment and the accompanying drawings in which FIG. 1a, 1b are a view of the composition of the entire apparatus according to the invention shown in the drawing, FIG. 2 is a perspective view of a device for winding a wool on a thorn, FIG. 3 is a partial sectional view of a device for winding a wool on the mandrel shown in cross section; FIG. 4 is a detailed cross-sectional view of the winding device, FIG. 5 is an end view of the arrangement of the cylinders and their mechanism, which confer synchronous spreading to them; FIG. 6 is a perspective view of the rotary cylinder drive, FIG. 7 is a view of the drawing device in the drawing, si. 8 is a plan view of the smoothing apparatus in the plan; 9 is a view of the polymerization chamber in the outline, with partial sections; FIG. 10 and 11 are views of the details of a device for delivering rotational motion to the linings in a drying furnace, FIG. 12a through 12f are schematic diagrams relating to the movement of a tubular liner in a kiln for drying.

The composition of the apparatus shown in FIG. 1a, 1b comprise in the sequence of the following comparison respectively. preparation:

- a kiln 2, which is fed by a conveyor 3 to a felt strip 1 in which a binder is distributed between the fibers. This drying oven can be of any known type suitable for this purpose, so we will not describe it in detail,

- device 4 for tearing the strip 1 into portions of a certain length,

- conveyor 5 for transporting parts of felt,

- a winding device 6 with a rotating mandrel for winding parts of the felt and thereby for forming the linings, thereby polymerizing the internal surfaces of said linings,

-organ oz. transport device 7 for carrying linings,

- a heating-smoothing device 8 for polymerizing the outer surface of the linings and for smoothing the outer surface of the liners, the liners being introduced into this liner by means of a lining transfer device 7,

- polymerization chamber 9 to complete the polymerization of the linings,

- a device 10 for cutting off end sections of the liner to achieve the exact desired length,

- preparation 11 for the execution of longitudinal notches in linings,

- Station 12 for wrapping wraps.

The winding device 6 for winding the linings is shown in FIG. 2 to FIG. 6. This apparatus comprises a heated mandrel made of two parts 20, 20a and three cylinders 21 with parallel axes with respect to the mandrel, these cylinders being arranged approximately below 120 ° about the mandrel. These cylinders, which are intended to be guides, are mechanically interconnected and progressively diverge from the axis of the mandrel in proportion to the lining design.

The mandrels 20, 20a are mounted on trolleys 22 that are movable on the transverse supports 23 located inside the protective box 24. The sliders with beads 33 and rollers 33a allow for the translational movement of the carts. The rotation of the half-toms-20, 20a is achieved with the help of the motor 25 And the transmission shafts 26. The trolleys are operated by half-toms shifting gears.

The rotating cylinders 21 are driven by a gearbox-mediated motor 28. The displacement of the cylinders 21 from the axle axis is arranged by means of articulated levers 30 connected by means of thrust rods driven by a hydraulic cylinder 31, the said levers being supported by the side walls 34. The ends of the said levers slide in guides 35. The inlet manifold provides power to the resistors, which provide heating to the semicircles 20, 20a.

This preparation works as follows:

Prior to reaching the felt sheet portion 1a, the ends of the two half-layers 20, 20a are in contact with each other and are heated to about 400 ° C. The front end of the felt sheet comes in contact with the cane and sticks to it to form the first sheath. Polymerization of the inner surfaces of the liner is carried out while winding a part of the felt strip onto the mandrel. The spindle rotates at a constant speed in the speed range of 80 to 800 rpm and the felts are healed at an accelerated peripheral speed. The three cylinders 21, which are mechanically interconnected, move away simultaneously at a slow speed and exert a constant pressure on the forming liner. At the end of the winding, due to the rapid polymerization of the resin on the inner surface of the liner, it is released from the mandrel, which remains in rotation with the help of cylinders 21. The distance between the cylinders and rotation of the mandrels is stopped when the liner is complete. This period of holding in a certain position and in rotation by means of the cylinders 21 aims at completing a rough treatment of the liner, by smoothing in contact with said cylinders.

At the end of this operation, the rollers 21) are spaced apart as well as the 20 - 20a half-hooks and the lining falls off. Immediately after the fall of the lining, the cylinders are again pressed around the half-thorns which they lead while returning to the position of reconnection of the half-thorns. They also get a rotary drive at the same time. A new winding cycle can now begin.

The lining 1b coming out of the preparation has a hard and smooth inner surface, which was obtained by contacting the felt with the heated mandrel, and the outer surface was also subjected to first smoothing by the rollers 21.

The cycle of action of the thorns 20, 20a and the cylinders 21 can be controlled by a photocell obscured by a portion of the blade 1a fed by the conveyor belt 5.

The lining discarded by the lining winding device 6 is received from the feeder 7 (Fig. 1a, Ib), which transports it to the heating device 8 shown in FIG. 7 and 8. This apparatus comprises a double-girder frame 44 having a lifting system at its upper end for the installation of a heating panel 45, which is provided internally with electrical resistors. This lift system consists of an engine 46 equipped with a gear unit and an electrical brake, and of four screw lifts 47 which are simultaneously driven by said gear 46 motor. Said hoists 47 are connected to the heating plate 45 by means of adjustable length bars 48 which are articulated to the heating plate 45 by means of stirrups 49.

The heating plate 45 is thus horizontally supported by means of screw lifts 47.

At its lower end, the heating and smoothing device 8 has a rolling assembly 50 configured as a conveyor belt driven by a motor variator 51 and horizontally tensioned between two cylinders 52, the upper portion of said conveyor belt being supported by small diameter rollers 53. . Two side chains connected to the conveyor belt guide it.

The temperature of heating plate 45 is approximately 400 ° C. The liners 1 b supplied by the conveyor 7 are moved between the conveyor belt of the roller arrangement 50 and the heating plate 45, rotating about its axis on its movement due to the influence of the conveyor belt and light pressure against the heating plate. This results in the final shaping and smoothing of the outer diameter and stabilization of the lining of the lining. On the other hand, due to the temperature of the heating plate 45, the outer surface of the liners is also polymerized, which gives a smooth surface a nice appearance, so that grinding or polishing is not necessary.

The polymerisation chamber 9 for the polymerisation of the lining which is housed in the heating and smoothing apparatus 8 is shown in FIG. 9 o: ι: τ> logs ib coming from the heating and cooling apparatus 8 sa into the polymerization chamber 9, which is intended for complete and even baking of the liners at a temperature of about 250 ^ 0, which enables polymerization with minimal smoke formation and release of gases. During baking in said oven, the liners 1b are transported without load, so as to prevent any damage to the outer layer which would be detrimental to the beautiful appearance. On the other hand, the liners lie flat along their entire length and at the same time rotate about their axis to allow even baking. Immediately after exiting the smoothing device 8 and in order to maximize the heat yield received by the linings 1b in contact with the heating plate 45, each liner is received by the lifting device 56 existing from the hydraulic cylinder and the groove 54 mounted on the piston. The photocell registers the presence of lining 1b and that the impulse to transfer lining 1b to the upper part of the chamber 8. During the said vertical transport, the lateral position of the lining is corrected by sliding guides for re-alignment. At the end of the stroke of the hydraulic lifting device 56, the groove 54 is tipped over and the lining 1b is rolled into the interior of the chamber 8. The entry door 61, driven by the hydraulic cylinder 62, briefly stops the lining before entering it. The opening of this door is timed and limited in order to minimize the caloric losses of the furnace.

In order to extend the residence time of the linings in the furnace and to limit the length of the furnace itself, there are several levels above each other, the number of which is five in the embodiment shown according to the invention.

The polymerization chamber 9 has transport portions 12'a, 12'b, ... 12'e arranged in several layers above each other on each of the floors, each transport section 12'a, 12'b ... 12'e comprising a sheath of cross bars 63, the ends of which rest on the hinges 64 of the crankshaft 65, which are arranged between and connected to the annular faces 65 '. In addition, the ends of the poles 63 are vertically guided in the slots 66 provided in the profiles 67. The angular displacement of the hinges 64 is such that the poles form a sheath of the sinusoidal course. In the example shown, the crankshaft step comprises six hinges angularly displaced by 60 ° C,

The crankshafts are driven to achieve constant rotational motion by means of a motor with a variator 68 and through a chain 69 which engages with the chain wheels 70 mounted on the crankshafts (Fig. 13).

Due to the continuous rotation of the crankshaft, the sheath of the sinusoidal course formed by the rods 63 is in continuous variation, maintaining the same pitch and the same amplitude.

Due to the sinusoidal alteration of said coat, the latter gives the bushings a double movement, namely translation and rotation about their axis. FIG. 12a to 12f show the movement of one liner on the transport sections 12a to 12f depending on the rotation of the crankshafts 65, these figures correspond to the successive rotations of the crankshafts 65 by 60 °. In the course of changing the sinusoid, the transported lining, due to its own weight, is always in the concave part of the sinusoid, which has the effect that the lining travels with the travel of the lateral part of the sinusoid and also rotates about its axis.

Two crankshafts 65 are installed at each level, the step of which is that the linings travel the entire length of the furnace. After the lining passes over the last transverse pole 63 of one level, they fall on the poles 63 of the sinusoidal sheath of the next lower level and traverse this level under the same conditions as the previous one. In doing so, the liners are exposed to horizontal transport in the opposite direction relative to the previous horizontal travel. Linings They stand out from the lowest level by rolling along an inclined plane 71.

Heating of the polymerization chamber 9 is ensured by means of gas burners 72 arranged on the floor 73 of the chamber And above which small stainless steel arches 74 are provided to prevent local overheating at the lower level of the furnace. The uniform distribution of heat rising air over the entire height of the polymerization chamber 9 is ensured by a thin perforated sheet 75 extending parallel to the upper part of the vault 74 at a certain distance from them. After the air comes in contact with all the linings in chamber 9, it exits through the chimney 76.

Finally, the insulating tubular linings 1b leaving the polymerization chamber 9 are brought to a device 10 for cutting off the end portions of the liners 1b, which cut off the ends of the insulating tubular liners 1b by circular knives.

Thus, it is advisable to equip a long slit with the length of the Insulated Pipe Lining produced - which is done in the notch 11, which facilitates the installation of the lining pads 1b on the pipe. Finished insulation tubes thus completed are finally brought to the station 12 for packaging of the insulated tubular liners in the ready-to-assemble condition.

It is the realization of the preparation for the manufacture of insulating tubular linings, especially fiberglass, which enables the production of insulating tubular linings with perfect outer and inner surfaces with accurate dimensions, the production of the device according to the invention provides a high level of production, with an improved life span of winding spikes preparation. Preparation Insulating tubular liners may be made of glass or similar mineral fibers, usually bonded with either phenol-formaldehyde or phenol-urea resin, or with the phenol-melamine copolymer, which is a common raw material in the field of manufacturing Insulating liners.

Characteristics of threading device 6

Tubular lining duration: 1.4 seconds Dead time (movements of various mechanisms during the cycle): 9 seconds Twisting cycle time: 10.4 seconds

Angular speed of the mandrel (20): 607 rpm

Cylinder angular speed (21): 212 rpm

Each cylinder 21 is driven by a free wheel. Heating and leveling device 8 for curing the outer surface of the pipe lining

Plate temperature 45: 400 ° C

Conveyor speed: 2m / min.

Pollmerlzaclj Chamber 9

It consists of five levels, each with a distance of 0,200 m. It is heated by eight gas burners 72, each of which has a heating power (2000 kilocalories) of 8373200 J.

Obtained temperature: 250 ° C Each crankshaft 65 is made up of six reels and hinged angles 60 ° each hinge 64 carries a tube 63 whose diameter is 10 mm.

In furnace 9 there are a total of 480 pipes 63

Each crankshaft rotation 65 moves the insulating tube lining by a total of 150 mm;

Each level comprises 16 steps, which are exceeded by the tubular lining in 16 revolutions of the crankshaft;

At maximum clock speed, each crankshaft rotates in 5 seconds, with a minimum stroke of 1 revolution in 30 seconds;

For tube lining 21 with a thickness of 25, the residence time in the furnace is 20 min.

Manufactured product

Insulating tube lining 21 mm internal diameter, with wall thickness 25 mm, outer diameter 71 mm

Specific mass of insulating pipe lining: 80 kg / m mass of insulating pipe lining: o kg 376

Insulating pipe lining It is made of crude wool 1.3 m wide with a content of 5% curable binder.

Each insulation tube requires 0.96 m of such felt.

Claims (5)

PATTERN APPLICATIONS 1. A device for making insulating tubular linings in a continuous manner and in large quantities of fibers, in particular glass fibers or the like, which are bonded with a curable binder, forming a part of the web in which the binder is evenly distributed is formed into a coiled tube liner and while heating by heating, it simultaneously hardens on the inside of the formed liner, comprising a rotatable, rotatable mandrel for winding the linen into a tubular liner, a polymerization chamber, heating devices internally and externally into an insulating liner of a molded linen sheath before being brought into polymerisation. the chamber, indicating that in the fan assembly (6) around the heated mandrel (20, 20a), driven rotary cylinders (21) which are mounted in pivotally mounted levers are held parallel to said angular intervals. (30), which are supported in the side walls (34), with one end of the levers (30) sliding in guides (35) opposite them the ends are pivotally connected to the masts and one of the levers (30) is articulated to the hydraulic cylinder (31) so that there is no heating and leveling device (8) between the winding device (6) and the polymerization chamber (9). which has a rolling assembly (50) underneath at least one of the heating plates (45) so that, in the front and rear walls, the polymerization chambers (9) are arranged on both lateral walls in the vertical floors of the crankshaft (65) arranged at one end projecting from the front walls of the pollmering chamber (9) are mounted chain wheels (70) which are in contact with the chain (69) of the drive variator (68), with the crankshafts (65) consisting of annular edges (65 ') which are interconnected connected to each other by 60 ° angularly displaced hinges (64), with the poles (63) resting on each respective hinge (64) defining the ~ .'soid transport sections (12kv ₍ 12'b ··. 12'e), whose bores are guided in vertical notches (66) of the beams (67) and that a heating device is installed in the polymerization chamber (9) existing from gas burners (72) positioned at the bottom of the chamber (9) and from the vaults (74) attached above the burners (72). Device according to claim 1, characterized in that the winding device (6) is made of three cylinders (21) which are mounted at 120 ° angular distances. Apparatus according to one of Claims 1 or 2, characterized in that the heating surface of the heating and ironing device (8) is designed as a panel (45) with preferably electric heating to achieve a temperature of up to 400 ° C and that the rolling assembly (50 ) an endless conveyor belt with fine hinges, which is mounted under the plate (45). Device according to one of Claims 1 to 3, characterized in that the ends of the adjacent transport sections (12'a, 12'b ... 12'e) are interposed, with the respective upper ends ending laterally in front of the ends below each. Device according to one of Claims 1 to 4, characterized in that for the vertical displacement of all the cross bars (63), at least one transport section (12'a, 12'b ... 12'e) and preferably all transport sections (12'a, 12'b ... 12'e) installed a common drive existing from the variator (68) and chain (69).