RU101672U1 - LINE FOR MANUFACTURE OF HEAT-INSULATED FLEXIBLE PIPE - Google Patents

Abstract

 1. A line for manufacturing a thermally insulated flexible pipe, comprising sequentially located unwinding device for supplying a working pipe, a correct device, a guiding device, a high-precision casting installation with a device for feeding and mixing a foaming heat-insulating material, an extruder, an extrusion head and a cooling bath, characterized in that the high-precision casting the installation with a device for feeding and mixing a foaming insulating material is equipped with a two- or multi-channel system conditioning, located in the extrusion head and containing two or more channel assemblies with supply channels for expandable heat-insulating material and coils covering the channels, with refrigerant circulating in the coils, the line is also equipped with a rotating calibration device located in front of the cooling bath and providing the formation of a screw form of the outer protective pipe -shells, a rotating calibration device is equipped with means for supplying refrigerant from the cooling bath to the surface obtained in external protective pipe-shell, while the output of the supply channels of the expandable heat-insulating material is located behind the rotating calibrating device, while the positioning guide is installed on the extrusion head for the precision movement of the working pipe and to prevent its sagging. ! 2. The line according to claim 1, characterized in that in the two- or multi-channel air conditioning system, the feed channel of the expandable heat-insulating material is made in the form of a tube made of a material with low surface activity. ! 3. The line of claim

Description

The utility model relates to the field of construction, in particular to the production of pre-insulated pipes used in the power industry, in the construction and laying of heating networks, as well as cold and hot water supply networks.

From the prior art there are various devices for the manufacture of thermally insulated pipes and their lines: DE 3126505; DE 3724360; DE 10312700; DE 19629678; DE 3717020; DE 3724360; EP 0038974; DE 19629678; EP 01566587; EP 1612468; EP 2060843; EP 2,138,751; EP 1010933; FR 2578026; JP 58020424; JP 2002323194; JP 58020425; JP 58076235; SU 1449025; RU 2265517; RU 2289751; RU 2293247; RU 2320484; RU 2339869; RU 2355941; RU 2372551; RU 11585U1; RU 2052706; RU 2280809; RU 96123112; RU 2003117471; RU 2004139112; US 4,844,762; US 4,929,409; WO 0035657; WO 0207948; WO 0231400; WO 0047387. These devices are quite complex because they require specialized equipment and require the manufacture of heat-insulated pipes in several successive technological steps. ,,

In particular, the production line of a thermally insulated pipe is known on the application for the grant of European patent EP 0897788, B29C 44/30, date publ. 02.24.1999. At the first stage of the implementation of this method, the working pipe and insulating materials are fed into the film sleeve, molding and structuring the insulation on the working pipe in the corrugator. At the second stage, extruding the outer pipe over the formed insulation.

The disadvantage of this line is the multi-stage process, the use of expensive equipment, labor and energy consumption, increased material consumption due to the use of additional materials (in this case, a film sleeve).

As an analogue closest to the utility model in terms of the set of features (prototype), the technical solution selected is described in international application WO 0035657, B29C 47/00, date publ. 06/22/2000

WO 0035657 describes a device for applying thermal insulation to a long pipe, providing a thermally insulated pipe through a one-step process without using centering elements of the working pipe relative to the outer sheath pipe and without using a film sleeve.

The device for applying thermal insulation contains an extrusion head through which a long pipe enters, and extruders that simultaneously extrude the foaming thermal insulation material and the external protective coating (pipe).

The extruder of the extrusion head includes a first hole from which the composition is extruded to form an external protective pipe-shell around the pipe, and a second hole from which the expandable heat-insulating material is extruded. The temperature of the composition for the protective sheath pipe is approximately 300-400T, while the expandable thermal insulation material should have room temperature. The expandable heat-insulating material and the composition for the protective pipe-shell are introduced under pressure through the appropriate matrix. The matrices are preferably cylindrical, corresponding to the shape of the pipe. After the simultaneous extrusion of a foaming heat-insulating material and a composition for a protective sheath pipe, conditions are created for quickly curing the material of the protective sheath pipe.

To quickly harden the thermoplastic sheath pipe, the product is cooled with liquid refrigerant (mainly water). This can be done by moving a long pipe with a foaming insulator and a protective sheath pipe through the area in which the liquid refrigerant is sprayed. Alternatively, the coated pipe may be immersed in a bath of liquid refrigerant, and forced air blowing may also be used. In the case of using a thermoset protective coating for rapid curing, it is heated. Then foaming heat-insulating material is vulcanized. It usually takes several hours to cure it. The vulcanization process can be accelerated by heating.

The disadvantages of the prototype include the fact that it provides for the manufacture of an external protective pipe-shell without the formation of a relief in the form of a helical surface, as well as the difficulty of simultaneously maintaining a high temperature of the composition for the protective pipe-shell and room temperature for foaming heat-insulating material (required to avoid premature foaming )

When creating a utility model, the task was to create a line for continuous, single-stage production of flexible pre-insulated pipes with a high degree of thermal insulation.

For the prototype and the claimed line common is the presence in its composition of sequentially arranged elements: unwinding device for supplying the working pipe, guide device, extrusion head, extruder and cooling baths.

The technical problem solved by the utility model is to ensure the stability of a one-stage, continuous process for the production of flexible thermally insulated pipes, increasing the productivity and quality of the products obtained, and the possibility of manufacturing pipes with a helical (corrugated) surface.

Due to the helical (corrugated) shape of the surface, a heat-insulated pipe acquires additional flexibility and elasticity, which makes it possible to operate pipelines made from it without the use of fixed supports and compensation devices for channelless laying, and also provides a low level of temperature loss of the coolant.

Distinctive features of the prototype features of the claimed method of manufacturing a thermally insulated flexible pipe, which provide a solution to the problem, are the following features:

- the presence of a rotating calibrating device that provides the formation of a helical shape of the outer protective pipe-shell;

- the rotating calibrating device is made in the form of a calibrator installed in a hollow sleeve and working in conjunction with a vacuum pump of the bath, creating a vacuum from the outside of the formed external protective pipe-shell, and the calibrator drive in the form of a gear motor mounted on the cooling bath connected to a chain or calibrator with a belt drive, while the inner surface of the calibrator is made with helical grooves, to which, due to the pressure difference, the formed external protective pipe-shell is moved axially;

- supplying a high-precision filling installation with a two- or multi-channel conditioning system located in the cavity of the extrusion head and having channel units with channels (tubes) for supplying a foaming heat-insulating material from a device for feeding and mixing foaming heat-insulating materials of a high-precision filling installation and coils with refrigerant circulating in them, covering channels (tubes). In addition, each feed channel of the expandable heat-insulating material in a two- or multi-channel conditioning system is made in the form of a tube made of a material with low surface activity;

- the exit from the channels of the expandable heat-insulating material is located behind the rotating calibrating device after preliminary cooling of the external protective pipe-shell in the rotating calibrating device.

The difference is also that in order to improve the removal of the dosed foaming material, a nozzle with compressed air is brought to the outlet from the two- or multi-channel conditioning system.

Also distinctive features of the claimed line is that a positioning guide is installed in the extrusion head to ensure smooth, coaxial movement of the working pipe and to prevent sagging.

The line can be equipped with a cutting device for cutting manufactured thermally insulated pipes into measured segments and a winding device.

The difference of the claimed line is also that it is equipped with a device for regulating and controlling the alignment of the position of the working pipe relative to the outer protective pipe-sheath in the form of a positioner having two degrees of freedom and adjusting and monitoring the position of the working pipe through the insulation layer. At the same time, the positioner is based on four independent actuators moving in the vertical and horizontal planes, a working sleeve with two rings, on which four electromagnetic sensors are mounted, a signal from which initiates commands of the positioner controls to turn on the corresponding actuators that change the position of the sleeve in the horizontal or a vertical plane, whereby the coaxial location of the working pipe relative to the corrugated shell through the insulation layer is established.

The stated technical problem is solved due to the fact that a two- or multi-channel air conditioning system combines several functions, namely:

- provides constant temperature support for the reaction mixture (expandable filler components);

- provides stability and controllability of the foaming process due to the ability to control the process of circulation of the refrigerant, including its temperature;

- ensures the operability of the line in case of "overgrowing" of the component supply channel, with switching to a free channel for continuous production.

In addition, the line provides a system for monitoring the position and alignment of the working pipe relative to the outer corrugated pipe of the shell, and control is carried out through the insulation layer with a positioning device with two degrees of freedom.

The claimed production line of a flexible thermally insulated pipe ensures the stability of the foaming process and obtains a high-quality product due to this, while the outer shell pipe has a helical (corrugated) surface, the molding of which is carried out by a rotating calibrating device, which improves the operational properties of the finished product.

This surface shape of the protective pipe-sheath made of polymeric materials reduces the level of effort during the winding of the finished product on the drum, and also reduces the level of internal stress during operation of the finished flexible insulated pipe.

In the analysis of the prior art, it was revealed that devices are known in which the corrugated surface is carried out on an external protective pipe-sheath made of polymeric materials (RU 2293247 and EP 2060843). However, this form of the outer protective pipe-shell is obtained by more complex means.

EP 2060843 has a guide tube in which the inner tube is located. The guide tube is axially adjustable, and its position is controlled by a device that monitors the central position of the inner tube and provides correction signals if necessary. The film comes from the bobbin and is formed around the inner pipe concentrically to it, forming a sleeve with a sealed or welded flank seam. A foamable mixture based on polyurethane or polyethylene is fed into the formed sleeve. The pipe closed by the film is introduced into the corrugator and forms corresponding recesses, similar in shape to half-waves, due to the geometry of the tool. A pipe comes out of the corrugator with half-waved recesses on the surface. An extruded plastic sheath is applied to the pipe by extrusion, which fills a half-wave-shaped recess. In this case, the outer shell is firmly connected to the film during extrusion due to the high temperature. In accordance with the described process, a corrugated (half-wave) surface is obtained in a corrugator, which in its working tool (forms) has a half-wave or half-corrugated work surface. As in the analogue of EP 0897788 described above, in which the molding of insulating materials also takes place in the corrugator, the difference is only in the shape of the surface of the working tool, the screw (spiral) in EP 2060843 or the ring shape in EP 0897788.

Unlike EP 2060843, the claimed line first provides the formation of an external helical surface, its cooling, and then the supply of reaction materials. The available equipment and technological conditions allow us to do this simultaneously, while the main equipment used is almost the same as with the cylindrical pipe production lines known from the prior art.

RU 2293247 describes a production line for an insulated pipe in which a sheath made of expanded metal is formed in the form of a pipe around an inner pipe (or inner pipes), a plastic film is applied to said sheath while moving in the longitudinal direction and its longitudinal edges are welded or glued, a foaming composition is fed into the gap between the inner or inner pipes and the polymer film or the sheath made of expanded metal, the tourniquet is wound around the polymer film helically. A polymer film between the turns of the tow is formed under the action of pressure of the expandable plastic in the form of an outward convexity and finally, by extrusion, an outer coating of thermoplastic plastic is applied, while the areas between the convexes are filled so that the outer coating acquires a helical waviness. According to RU 2293247, foam is formed in the annular gap between the inner pipe and the expanded steel shell due to the holes in the expanded steel shell, and then the resulting bulges are coated by extrusion, i.e. foams are initially supplied, and then an outer coating is applied.

In RU 2293247 and in EP 2060843, the formation of the corrugated pipe relief occurs in two stages: initially, the insulation layer is corrugated (corrugated), and only then is the outer layer applied. This fundamentally distinguishes the claimed line from the known from the prior art. In the claimed line, the formation of the outer coating (outer protective pipe-shell) occurs simultaneously with the molding of the insulating layer, which is due to the presence of a rotating calibrating device.

The technical result obtained by the implementation of the utility model consists in increasing productivity, ensuring the stability of a single-stage continuous production of flexible thermally insulated pipes to improve the quality of the products obtained, obtaining a spiral (corrugated) pipe surface in a single-stage process. Also, the claimed line provides the opportunity to expand the range of finished products manufactured on it. For each type of flexible heat-insulated pipe, a standard, interchangeable set of working tools (dies, mandrels) is made, the line allows for quick readjustment, and as a result, an increase in labor productivity.

The design of the line for the manufacture of flexible thermally insulated pipes is illustrated by the following drawings.

Figure 1 shows a General view of the claimed line.

Figure 2 - line, top view

Figure 3 - thermally insulated flexible pipe.

Figure 4 is an example of a thermally insulated flexible pipe with a working pipe made of a polymer material.

Figure 5 is an example of a thermally insulated flexible pipe with a metal working pipe.

Figure 6 - two or multi-channel air conditioning system installed in the extrusion head.

7 is a General view of a rotating gage device.

On Fig - rotating calibrating device, left view.

Figure 9 - positioner of the working pipe, General view.

Figure 10 - positioner of the working pipe, left view.

The line for the manufacture of a thermally insulated flexible pipe (Figs. 1 and 2) includes sequentially arranged elements through which the working pipe passes: an unwinding device for feeding the working pipe 1, a correct device 2 with a heating system, a guide device 3, a high-precision casting unit 4, an extrusion head 5 , an extruder 6, a rotating calibrating device 7, a cooling bath 8, a positioning device 9, a pulling device 10, a cutting device 11 and a finished product winder 12. The arrow shows the supply of the working pipe, if it is supplied without using the unwinding device 1 directly from the line of its manufacture.

The unwinding device 1 is a rotating coil mounted on movable support rollers of a metal base. For smooth and continuous supply of the working pipe, support rollers equipped with a brake system. In addition, the unwinding device may have another design known in the art.

The correct device 2 with a heating system is made in the form of a set of rotating horizontal rolls and serves to align and relieve internal stresses of the working pipe. The straightness and accuracy of the cross-sectional shape is ensured by the presence of precise mechanical or digital indicators of the position of the rolls (means are known from the prior art). The heating of the working pipe can be electric or gas.

The guide device 3 is designed to prevent deviations of the movement of the working pipe to the side, damping vibrations and precision input through the extrusion head. It determines the trajectory, the nature of the movement of the working pipe and consists of two pneumatic identical upper and lower tracks, mounted parallel to one another.

High-precision casting unit 4, is used for the production and dosing of foam systems. The equipment of the casting plant depends on the composition of the mixture and the given technology. Here, the individual components are brought to a certain condition: the components are heated to a certain temperature, the components are pre-mixed with their subsequent supply through the extrusion head 5 to the air conditioning system.

The extrusion head 5 is designed to distribute the polymer in the channel so that the melt exits at the same speed.

The extrusion head 5 is a profiling tool that gives the molten polymer the desired shape. In this line, a head with an angular flow of the melt is used and the internal cavity of the extrusion head serves as the basis for installing a two- or multi-channel conditioning system (Fig. 6) with two (or more) channels for supplying the components of the expandable mixture.

A two- or multi-channel air conditioning system installed in an extrusion head consists of the following elements:

- positioning guide 16 for the precise direction of movement and to prevent sagging of the working pipe.

- a channel unit (there can be two or more), which (or each of them) includes a channel 17 for supplying the reaction material made of a material with low surface activity, installed in the coil 18 through which the refrigerant is circulating. The temperature of the refrigerant is regulated depending on the temperature of the reaction material: it is cooled to prevent premature foaming or heated for a timely reaction. A nozzle 19 with compressed air is brought to the point of leakage from the channel to improve the removal of the dosed material.

The multi-channel air conditioning system performs the following functions:

1) maintains a constant temperature of the flowing reaction material, stability and controllability of the foaming process due to the circulation of a controlled temperature refrigerant.

2) ensures the operability of the line in the event of “overgrowing” of any of the feed channels for the components of the expandable reaction material with the possibility of switching to a free channel for continuous production.

3) the design of the multi-channel air conditioning system is made in such a way that it performs the function of an additional precision guiding device for coaxially feeding the working pipe into the cavity of the external protective pipe-shell, extruded and molded into a screw surface.

4) delivers the foaming components to the foaming point.

The extruder 6 provides the melting, homogenization and supply of polymer material to form an external protective tube-shell through the extrusion head 5. The extruder 6 can be equipped with a device for pre-drying the feedstock and feed loaders.

Under the action of gravity, the polymer material flows down from the loading hopper into the working volume of the extruder 6. Inside the extruder, the polymer material enters the enclosed space between the rotating screw and the stationary walls of the working cylinder. The impact of friction forces heats up the material, and due to the rotation of the screw, the polymer melt of the required consistency is delivered under the specified pressure to the extrusion head 5. In this case, the outer protective pipe-shell of polymer materials is produced through the extrusion head 5 with the angular flow of the melt, then the external the protective tube-shell is molded in a rotating calibrating device 7 to form a helical (corrugated) surface on it and is thermally stabilized in the cooling bath.

The rotating calibrating device 7, mounted on the same bed with the bathtub 8, is the main part of the line through which the principle of one-stage production of a flexible thermally insulated pipe is realized due to the combination of the functions of a forming and cooling devices in a rotating calibrating device. The rotating calibrating device 7 sets the necessary dimensions and shape of the product and consists of a calibrator 20 installed in the sleeve 22 and fixed to the end of the gear calibrator 21. The torque is transmitted to the calibrator due to a chain or belt transmission from the gear from the gear motor 23 installed in the cooling bath.

On the inner surface of the calibrator 20, grooves 24 are made in the form of a helical surface. When forming the outer protective tube-shell due to the vacuum created by the vacuum pump 25, the workpiece of the outer protective tube-shell is pressed against the walls of the calibrating device. The formation of the protective pipe-shell is carried out due to the fact that the air inside the workpiece is at atmospheric pressure, and a vacuum is created outside, under the action of which, the workpiece of the protective pipe-shell is pressed against the walls of the calibrating device, forming a pipe of a given size and configuration. Due to the axial rotation of the calibrating device around and the longitudinal movement of the workpiece, the outer surface of the extruded protective sheath pipe acquires a helical (corrugated) shape. The calibrator 20 is in contact with the polymer melt, molded and cooled by the refrigerant taken from the cooling bath 8. When the extrudate leaves the calibrator 20, it already has sufficient strength to be drawn by its pulling device.

The cooling bath 8 consists of two parts and is a vacuum cooling bath equipped with a vacuum pump to create a vacuum in the calibrating device 7 and a circulation pump that delivers refrigerant (water) to the calibrating device 7 and the cooling part of the bath 8. The melt from which is formed external protective pipe-shell, has a high temperature (190-220 ° C) and due to the fluidity does not have its shape. In order to give him this form, he enters a calibrating device, which forms the necessary profile (pipe geometry).

To obtain a given pipe profile, several conditions must be met:

1) Create a pressure difference between the outer and inner parts of the calibrator to press the melt to its walls. There is atmospheric pressure inside the pipe (on the inside) of the molten melt (due to communication with the outside atmosphere), and a vacuum must be created on the outside of the molten melt. Vacuum is created by a vacuum pump.

2) Apply externally to the calibrator in which the molten melt is located, refrigerant (water) to cool it and thereby pre-fix its shape. After that, the obtained external protective pipe-shell with a newly formed profile (shape), but not completely cooled, is drawn through the cooling part of the bath, where it is finally cooled (thermostabilized).

The caliber is mounted on one bed with a vacuum cooling bath, on which a vacuum pump is also fixed to create a vacuum in the bath (to press the melt against the walls of the caliber) and a circulation pump (pumps) to supply water to the caliber for pre-cooling. In the bath 8 (its cooling part), the helical surface of the external protective pipe-shell is finally cooled by spraying refrigerant (for example, water) with pumps through nozzles installed along the entire length of the bath. The bath has connection points for supplying cold and discharging heated refrigerant. The refrigerant should be kept at the lowest possible temperature as far as the polymer being processed allows. The stored heat can be additionally removed by an external refrigerator or a multi-stage heat exchanger can be used.

Foaming reaction materials are fed into the thermostabilized annular space formed between the outer sheathing pipe and the working pipe through the channels of a two-channel or multi-channel conditioning system of a high-precision casting installation, which uniformly fill the cavity between the sheathing pipe and the working pipe, where the formation and foam stabilization.

Due to the adhesion of materials arising at the boundary, a single non-separable flexible thermally insulated pipe with a helical (corrugated) surface and high thermal insulation properties is formed.

Positioner 9 is designed to determine, regulate and control the position of the working pipe relative to the outer protective pipe-shell with a helical surface during the process of stabilization of thermal insulation. It consists of two vertical independent actuators 26, 27 (moving up, down), two horizontal actuators 28, 29 (moving left, right), a working sleeve 30 with locking rings 31 on which four electromagnetic sensors 32 are mounted, giving commands to the controls positioner 9 (actuators), which, in turn, adjust the location of the working pipe relative to the corrugated shell through a layer of not yet cured insulation. Positioner 9 is a device with two degrees of freedom.

The pulling device ^ providing pipe movement along the line consists of two tracks, of which the upper pneumatic presses the pipe, and the position of the lower one is mechanically adjusted and is set depending on the diameter of the thermally insulated pipe being manufactured. The distance between the upper and lower caterpillars is maintained unchanged when releasing a thermally insulated pipe of the same diameter. A chain with rubber gaskets rotates in the caterpillars, which is driven by an electric motor with stepless speed control and, thus, the pulling device provides continuous withdrawal of the manufactured pipe and its supply to the planetary type cutting device 11, where the produced pipes are cut into measured segments.

The winding device 12 is equipped with an electric drive and speed control from a central console. Designed for winding pipes into bays with a diameter of up to 3.5 meters and their packaging.

This line for the manufacture of a thermally insulated flexible pipe provides for the combination of various control devices and mechanisms, under the control of a single microprocessor system that provides full automatic control and management of all elements of the extrusion line.

The maximum possible exclusion of contact of maintenance personnel with production components, mechanization and automation of extrusion processes, insulation supply, simplification of unit designs and increasing their reliability, provide the task of increasing labor productivity, solved by a utility model.

The operation of the line for the manufacture of thermally insulated flexible pipes is as follows.

The working pipe 13 is supplied from the drum of the line unwinder 1 or is produced simultaneously with the manufacturing process of the heat-insulated pipe and is fed to the line without intermediate winding. Before applying a heat-insulating layer to the working pipe, it is pre-adjusted and heated in the correct device 2, which is necessary to improve adhesion between the materials, the working pipe is positioned in the guiding device 3 and then moves through the extrusion head 5 with an angular flow of molten polymer materials.

The working pipe 13 can be made of various durable flexible materials, for example, polymers (figure 4) or metal (figure 5). There can be several working pipes inside the outer shell pipe.

The outer protective tube-shell 15 of polymer materials is extruded coaxially to the working tube and is molded in a rotating calibrating device 7 to give it a helical shape. Such a geometry of the billet pipe, as indicated above, reduces internal stresses during winding of the finished product on the drum of the winding device 12, as well as during operation of the finished heat-insulated flexible pipe.

In the process of continuous supply of the working pipe through the extrusion head 5 with a lateral supply of polymer materials, which extrudes the outer shell pipe, and the rotating calibration device 7 forms a shell pipe into the corrugated surface. The calibrating device is equipped with nozzles for supplying refrigerant (water) from the cooling bath to the surface of the obtained external protective pipe-shell for its thermal stabilization and cooling.

Then, into the thermostabilized (cooled) cavity between the working (inner) pipe and the screw (corrugated) surface of the outer shell pipe, a foaming heat-insulating material is fed through the channel nodes of a two- or multi-channel conditioning system that evenly fills the pipe’s internal cavity - shell 15 with the formation of a layer of thermal insulation 14.

A two- or multi-channel air conditioning system consists of two or more channel units 17 (according to the number of channels) of supply and mixing (injection) of expandable heat-insulating materials and ensures constant temperature maintenance, stability of the foaming process and its controllability. Maintaining the required temperature by the air conditioning system is due to the circulation of the refrigerant (for example, water) through the coils 18, covering the tubes forming the channels 17 of the feeder foaming foamed insulating materials. The coil 18 cools the tube (channel 17), inside which are the components of the expandable materials, and at the same time is a guide and supporting device for it. The tubes forming the channels 17 of the device for feeding and mixing expandable heat-insulating materials are made of a material with low surface activity. The channel 17 serves the reaction materials, which in the process of passing through the tubes are additionally mixed with layers.

A two- or multi-channel conditioning system is located in the cavity of the extrusion head, the coil 18 (coils) cools the channel (s) 17 of the channel supply unit of the expandable heat-insulating material, as well as the space around the coil, which provides the temperature required for the foaming process.

The supply and mixing (injection) using two or more channels 17 (tubes) ensures the operability of the line in case of “overgrowing” of the foaming material supply channel by switching to a free channel. In the case of "overgrowing" of the channel, the supply of components of expandable heat-insulating materials passes to another channel and ensures the continuity of the production process of the heat-insulated pipe.

An air-conditioning system with a device for feeding and mixing expandable heat-insulating materials is placed in the cavity of the extrusion head 5. An additional supporting and centering device for the working pipe can be placed in the same cavity.

Next, the resulting product is cooled in a cooling bath 8 filled with a refrigerant, for example, water.

The supply of expandable heat-insulating materials from a high-precision casting unit 4 is synchronized with the feed of the working pipe and the extrusion process, which makes it possible to obtain a uniform density and controlled distribution of the heat-insulating layer 14.

The control of the position and alignment of the working pipe relative to the outer corrugated pipe of the shell is carried out through a layer of not yet cured thermal insulation with a positioning device 9 with two degrees of freedom.

Using the pulling device 10, the finished flexible thermally insulated pipe is fed into the cutting device 11, in which cutting into measured sections takes place, and the finished product winder 12 is wound onto the drum and packaged.

On the winding device, pipes are wound into coils and packages.

Claims (6)

1. A line for manufacturing a thermally insulated flexible pipe, comprising sequentially located unwinding device for supplying a working pipe, a correct device, a guiding device, a high-precision casting installation with a device for feeding and mixing a foaming heat-insulating material, an extruder, an extrusion head and a cooling bath, characterized in that the high-precision casting the installation with a device for feeding and mixing a foaming insulating material is equipped with a two- or multi-channel system conditioning, located in the extrusion head and containing two or more channel assemblies with supply channels for expandable heat-insulating material and coils covering the channels, with refrigerant circulating in the coils, the line is also equipped with a rotating calibration device located in front of the cooling bath and providing the formation of a screw form of the outer protective pipe -shells, a rotating calibration device is equipped with means for supplying refrigerant from the cooling bath to the surface obtained in external protective pipe-shell, while the output of the supply channels of the expandable heat-insulating material is located behind the rotating calibrating device, while the positioning guide is installed on the extrusion head for the precision movement of the working pipe and to prevent its sagging. 2. The line according to claim 1, characterized in that in the two- or multi-channel air conditioning system, the feed channel of the expandable heat-insulating material is made in the form of a tube made of a material with low surface activity. 3. The line according to claim 1, characterized in that a nozzle with compressed air is brought to the zone of leakage of the expandable heat-insulating material from the channel or channels of the two- or multi-channel air conditioning system to improve the removal of the dosed foamable heat-insulating material. 4. The line according to claim 1, characterized in that the rotating calibrating device is made in the form of a calibrator with a drive mounted for rotation in a hollow sleeve and made with screw grooves on the inner surface, while the calibrating device is connected to a vacuum pump of a vacuum cooling bath to create a vacuum from the outside of the molded external protective pipe-shell, and the calibrator drive is made in the form of a gear motor mounted on the bathtub, connected to the calibrator by a chain or belt drive, while and the calibrator has nozzles for supplying refrigerant from the cooling bath. 5. The line according to claim 1, characterized in that it is equipped with a positioning device for monitoring and correcting the position of the working pipe relative to the external protective pipe-sheath, made in the form of a positioner having two degrees of freedom, and sensors that monitor the position of the working pipe relative to the external protective pipe-shell through a layer of thermal insulation. 6. The line according to claim 5, characterized in that the positioner is made on the basis of four independent actuators that specify controlled movement in the vertical and horizontal planes of the working sleeve, as well as two locking rings, on which four electromagnetic sensors are installed, the output signal from which transferred to the positioner controls governing the location of the working pipe relative to the outer sheath pipe through the insulation layer.