Production of heat-insulated pipeline, pipeline and plant for pipeline production

FIELD: process engineering.

SUBSTANCE: invention relates to production of crimped heat-insulated pipeline. Pipeline comprises at least one inner pipe, crimped outer pipe spaced therefrom and made of synthetic material and a ply of foamed synthetic material to fill the spacing between both pipes. First, ply of foam is applied to inner pipe to extrude outer pipe thereat. After extrusion of outer pipe, forming tools are used to make crimps on foam ply.

EFFECT: higher flexibility of pipe.

15 cl, 3 dwg

 

The technical field to which the invention relates.

The invention relates to a method of manufacturing a pipe with insulation, which includes at least an inner tube located at a distance from her corrugated outer pipe of synthetic material and a layer of foamed synthetic material filling the space between the inner pipe and the outer pipe, and at first the foam is applied on the inner tube, the inner tube with a layer of foam with the extrusion of an external tube.

Further, the invention relates to having the insulation Gavrilovna pipeline, as well as installation for the manufacture of tubing.

The level of technology

From EP-A-0897788 known method according to the restrictive part of paragraph 1 of the claims. This method has worked well and provides piping with insulation of high quality. Made by way of pipelines used in local and district heating or in industry. Created according to EP-A-0897788 when applying foam on the inner tube or inner tube corrugation allows for completely fabricated pipe a small bend radius, which vary depending on the size of the pipe and allow a simple gasket. So known under the name CALPEX® tubing for heating when the RA is the measure of the diameter of the outer tube 162 mm has a bend radius of 1.2 m But there are applications in which desirable even smaller bending radius of the pipeline with insulation. From DE-A 19507110 known way educational pipeline from synthetic materials, thermally insulated, which by means of extrusion is created coaxially with the inner tube outer tube made of synthetic material with a wall thickness of only 0.3 to 0.5 mm, and the outer pipe by means of the forming chain, placed in vacuum, as in hariraya machine for producing corrugated pipes of synthetic material, extends through the vacuum forms. At the same time containing a working gas polyethylene foam using extrusion is served in the hollow space between the outer thin tube and the inner tube, which foam fills the hollow space. If you pull the thin outer pipe forms with the help of vacuum can be corrugation only a small depth. From WO-A 02/07948 known piping with insulation, in which the inner pipe is provided with an insulating layer, after which an external pipe. Then one of the external pipe device for creating edges receives the form, with the ribs. In the manufacture of simple corrugated pipes, for example, from US-A 5522718 known transportation halves forms using manipulators and sled on the site opposite the CSOs of turn.

Disclosure of inventions

The basis of the invention lies in the task of improving pipeline with insulation and its method of manufacture, as well as establishing a production pipeline.

The way this is achieved through the fact that following the end of the extrusion of the outer tube using existing foam layer inner tube using molding tools creates a corrugated form.

It turned out that way when the special connection of the inner pipe, consisting of foam insulation, and an outer pipe with the troughs of the waves can get going deeply into the pipe corrugation in the outer pipe and the insulation, which gives you more flexibility. Deep corrugation this zapressovyvajutsja moulding tools in a fully extruded with the insulation of the pipeline. It extends deeply into the pipeline and, thus, inside the insulation. This is in contrast to the above methods with hariraya machine using vacuum or excess pressure) to create a waveform, which can be achieved only relatively small depth of the corrugation.

Deep corrugation is carried out by pressing, preferably directly behind the production with extrusion of the outer tube, after which the pipeline to them is no temperature, allowing plastic deformation using molding tools. However, preferably, if fully extruded tubing on the plot to deep corrugation is supported with a suitable constant temperature, for example using a bath for spraying with water. Thus, a fully extruded tubing with an optimum temperature comes to pressing deep folds in the appropriate tools. But it can also be a later creation of a deep folds at a particular stage of manufacture, for which the pipeline using heaters is brought to a temperature which allows the injection of the corrugation.

You may also already in foam insulation to create the resulting current way the first corrugation, as described in EP-A-0897788, with deep corrugation after extrusion according to the present invention transforms and deepens the first corrugation. But it can also have a smooth coating of foam and extruded with a smooth external pipe be fitted with a pressed corrugation according to this invention. The course of action according to the first variant, in which, thus, giving form deep folds is carried out after the extruder on already having the m convoluted piping, preferred as the corrugation when applying the foam and the subsequent extrusion of the outer tube on the first corrugation, as a rule, results in increased density of the material of the outer tube in the hollows of the waves. It is then for reaching greater depths of the second corrugating using molding tools after the extruder provides in order that when the deep corrugation there are no defects in the outer tube. The establishment of the first corrugation can be carried out, in particular, before the extruder and, thus, consistent with this positioning of the molding tools for deep folds.

Preferably the depth of the wave is equal to or greater than 4 mm and, thus, at least 33% more than the mentioned pipe CALPEX®, which is manufactured in accordance with the prior art. Especially preferred depth waves from 4 to 10 mm According to the invention can be created in the main U-shaped troughs of the waves, which, in particular, are separated from each other passing exactly the parts of the surface. With this formation you get a good distribution of the material of the outer tube when the shape after extrusion. In a preferred form of implementation of the forms used for deep folds, chilled, in particular, provided water is essential cooling. For abstraction forms for deep corrugation of the pipe may be provided that forms equipped with channels that allow the injection of air to maintain the waste forms.

Brief description of drawings

Below using the drawings in more detail, explains the embodiments of the invention. When this show:

figure 1 is a schematically an installation for implementing the method;

figure 2 schematically create corrugated final form; and

figure 3 image of a partial section of a preferred variant implementation of the pipeline.

The implementation of the invention

Figure 1 shows the replacement roll 1 to the extruder 12 system for the manufacture of tubing with insulation, known from EP-A-0897788. When the inner tube 2 is continuously delivered from the back of the drum 1. Means for winder or transported in the direction of manufacture not shown since such means are well-known specialist. The inner pipe can be represented by a tube made of synthetic material or metal pipe and may be smooth or corrugated. In particular, finds the use of the inner pipe 2 cross-linked polyethylene. The inner tube 2 can be routed through a pair of gauge rollers 3, whose rollers are set in motion. A pair of gauge rollers 3 can the move mainly in two being perpendicular to each other in directions crosswise to the direction of production or direction of the winder.

With a spare spool 4 leaves the film 5 made of synthetic material, in particular plastic film, and is formed around the inner pipe concentrically thereto with the formation of the pipe with slit with glued or welded longitudinal seam. In still an open pipe 6 with crack is injected foaming a mixture of synthetic materials, in particular polyurethane-based or polyethylene-based, for example, by using the nozzle 7. A closed pipe with slit is served in the forming tool 9, which is formed from a large number of halves 9a and 9b forms, which together form a "migratory form for the inner tube, provided with an insulating layer under the film 5.

Surface halves 9a and 9b of form facing the film 5 or the pipe 6 with the slit may have a wave profile, which is pressed film 5 due to the pressure of the foam. In the case, which is depicted in the figure, the pipe 10 extending from the molding tool 9 has a corrugated surface. But the surface halves 9a and 9b of form, turned to the film 5 can be formed also smooth. The pipe 10 extending from the molding tool 9, in this case has a smooth surface. In this case, the forming tool 9 could also be replaced by a non-roaming shape in the form of a hollow cylinder.

After that, the pipe 10 may be passed through known from EP-A-0897788 condition the device for x-ray radiation, with the help of which continuously monitored the exact position of the inner pipe relative to the Central position.

At the next stage of manufacture of the pipe 10 by means of the extruder 12 of synthetic material is created of the outer tube 13. In this known method creates a vacuum that helps seal the outer tube to have a layer of foam pipe 10. In the case of the corrugated pipe 10 of the outer tube 13, which may also be referred to as outer material, is applied to the corrugation of the pipe. In the case of a smooth pipe 10 outer material is wrapped around the smooth tube and is also smooth. Outer material is glued thus obtained in the extrusion of high temperature film 5 made of synthetic material.

Preferably now in the sequence of manufacture of tubing directly on the stage extrusion followed by fully extruded pipe is created deep corrugation, so that we get a continuous manufacturing. Deep corrugation is performed by pressing the waveforms in the pipeline. This is done, for example, so that the distance from the extruder 12, which may be, for example, 3-4 m, molding tools 16-21 creates a deep corrugation according to the present invention. This creation is h is equipped with an external pipe 13 to the pipe 10, which due process heat due to foaming and extrusion can still deform. May also be used for process heat earlier stages of the manufacture by applying a layer of foam or extruded, or means of heating or cooling can be ensured that the pipe 10, 13 at the entrance to the molding tools will have a temperature that will allow the injection of deep folds in the pipeline. Preferably provides bath 23 for spraying, in which a fully extruded tubing is brought and maintained at suitable for deep folds temperature. The temperature depends on the synthetic material of the pipe and, thus, simply defined for the expert or can be established empirically. Used to create deep corrugation molding tools can be, for example, again endless, moving together forming tools, as they seemed to moulding tool 9 for applying a layer of foam or other well-known specialist moulding tools. The other example of the molding tools is described below.

Pressing in deep folds using molding tools can also be carried out at a particular stage of manufacture, after t the th as extruded tubing was cooled and was staged, so you get a continuous manufacturing. But in this case it requires a heat pipeline from the storage temperature to the temperature, which makes possible the injection deep folds.

The following describes an example of creating deep folds using forming tools according to figures 1 and 2. Provided by the first pair of halves forms 18 and 19 forming tools, while it is equipped with 16 drive, which contribute to the following movements halves forms 18 and 19. For halves forms 20 and 21 provided with means 17 of the drive. Means of the actuator 16 and 17 can be pneumatic, hydraulic and/or electric motor, or done any other way. Specific performance of these funds actuator obvious to a person skilled on the basis of the following describes the flow requirements professional event here and not further described. After leaving the halves of the form 20 and 21 of the tubing is fully formed with deep corrugation. He can carry through not shown, the cooling station and can be pulled together using the tape diverting device and to gather around the drum.

Figure 2 shows the halves of the molding tools 18-21 no means drive. Movement of the halves of the form by means of the actuator, depicted by arrows A-D. the Pipe 10 inside the second pipe 2, which has insulation 15 of foamed synthetic material, which on its outer side has a film sleeve 6, and you have created using the extrusion of the outer pipe 13, as shown in the figure, after she came out of the extruder. In this case, it presents a smooth pipe without corrugation. Half forms 18 and 19 now with their only partially visible core parts 18' and 19' on both sides of the pipe creates a deep corrugation, while the halves of the form 20 and 21 with their only partially visible core parts 20' and 21' create deep corrugation on the top and bottom. When this form are of such dimensions that a circle is uniform deep corrugation pipe 22. When this is done so that the halves of the form 19 are driven in the direction of the arrow a and the halves of the form 18 are in motion in the direction opposite to the arrow a, so that the halves of the form closed and contribute to the relevant morphology is still hot and is able to deform the pipe 10. Closing and closed halves 18 and 19 forms are moved in the direction of arrow b with speed of production coming out of the extruder pipe 10. If passed the appropriate path, which may occur, for example, after 3 to 5 seconds or more in the case of finding pipes, half the rates in the path of motion b again depart from each other, that halves 19 form means movement in the direction of the arrow c and halves 18 forms the opposite movement. Figure 2 shows the position in which the halves 18 and 19 have been parted from each other. This has formed the lateral area of the pipe 13. Contrary to the image in the drawing the upper and lower pipe 13 is not formed yet, but the drawing is depicted differently, to better demonstrate the formation through the halves of the form. The shaping of the top and bottom is only halves 20 and 21 forms, which are described below. From the displayed position of the halves 18 and 19 form the method is performed in the direction of the arrow d, and it is faster than the speed of manufacture of tubing 22. Halves 18 and 19 of the form when it is moved so far in the direction d that the next circuit in the direction of the arrow a or in the opposite direction are formed even where the lateral pipe. It can be provided that this is always the first in the direction of making the step wave form accurately engages formed in the last wave.

The molding tool halves 20 and 21 form, which form a convoluted with the upper and lower sides, works the same way. He carries out the closing in the direction of arrow a or in the opposite direction, so, the two halves 20 and 21 form form a closed shape. Then the method is carried out in the direction of the arrow b during the same duration of, for both halves 18 and 19 form. After this withdrawal form in the direction of arrow c or in the opposite direction and quickly return both halves of the form in the direction of the arrow d. These movements, of course, are carried out synchronously with the movement of the halves 18 and 19 form, so that all parts of the form together, carry out the method in the direction of the arrow b together or make a quick return in the direction of the arrow d.

Preferably are cooled halves form, in particular, due to the fact that the halves of the form provided by the channels for the environment in which via at least one connection for the supply in the halves of the form can be directed cooling fluid (mostly water) and can be discharged via (not shown) connected to exhaust. Further preferably, if the halves of the form provided by pass air and a connection for compressed air in order to maintain the withdrawal form is received with deep corrugation pipe could be supplied with compressed air in the molding space of the halves of the form.

Figure 3 shows respectively formed entirely manufactured pipe 22, and the same is mi positions are equipped with the same details. Visible deep corrugated form 25 with depression and lying between the upper sides 26. Deep corrugation this extends, as can be seen, deep in the insulation layer of the pipeline. Preferably presents a morphology in which the hollow corrugated shape 25 are generally U-shaped and the surface 26 is generally flat. Also another possible form. The depth t of the depression, which is seen in cross section in figure 3, is from the upper surface 26 of the pipeline when viewed from there, preferably 4 mm or more. In particular, the preferred range 4-10 mm. Such deep corrugation allows pressed the forming tool in the pipeline and leads to very good flexibility of the pipeline. This can be done in the way described above. While it is preferable that the tube 10 is already before the extruder 12 was Gavrilovna explained in a known manner, so that in figure 2 on the left before the halves 18 and 19 form the visible portion of the tube 13 would be convoluted, which, however, smaller than the corrugation created moulding tools 18-21. Hollow corrugated shape 25 in this case are preferably where depressions were created using the forming tool 9.

The depth of the corrugation is made exactly in the hollow corrugated shape you created earlier, corrugated pipe, preferably this is achieved by the fact that a device for the registration before the molding tools fix existing corrugation and manages moulding tools so that they produce the injection deep folds with agreement with previous corrugation. In figure 1 it is presented as an example of what the device 30 logs the corrugation, in this example, the corrugation of the pipe 10 with a layer of foam has already convoluted before the extruder. This can be done, for example, optical or ultrasound by recognizing the troughs of waves, for example, using remote sensing, or may be performed mechanically. The position of the corresponding depression (or alternatively or additionally the crest of the corrugated shape) in this case, as the input values are transmitted to the control device 31 of the molding tools. It manages the resources of 16, 17 forming tools so that the pressing deep trenches is moulding tools in place of the depressions of the pre-corrugated pipe 10.

1. A method of manufacturing a pipe (22) with insulation, which includes at least one inner tube (2)located at a distance from her corrugated outer Proc. of the BU (13) of synthetic material and a layer (15) made of foamed synthetic material, filling the space between the inner pipe and the outer pipe, and the first inner tube (2) put a layer of foam and the pipe (10)formed by the inner pipe and the foam layer, using extrusion create the outer tube (13), characterized in that following the end of the extrusion of the outer tube to the foam layer by using molding tools (16-21) create a corrugated shape (25, 26).

2. The method according to claim 1, characterized in that the corrugated shape pressed into the pipeline by means of moulding tools.

3. The method according to claim 1 or 2, characterized in that the corrugated shape create directly after the extrusion of the outer tube (13).

4. The method according to claim 1 or 2, characterized in that the depth (t) of the corrugation is equal to or greater than 4 mm and, in particular, is from 4 to 10 mm

5. The method according to claim 1, characterized in that the hollow corrugated shape (25) basically has the shape of a U.

6. The method according to claim 1, characterized in that the upper side of the corrugated shape (26) between the depressions is generally flat.

7. The method according to claim 1 or 2, characterized in that the forming tools include half forms, which cyclically move while creating a waveform with the speed of manufacture of the pipe (22) and after removal of forms returned with a higher speed in the opposite direction.

8. The method according to claim 5 or 6, characterized in that the PE the new shape of the wave form when creating a layer of foam on the inner pipe (2), and created using the extrusion of the outer tube (13) has a first waveform, and then using molding tools following the end of the extrusion of the outer tube to create deep corrugated form (25, 26), and the deep depression of the corrugation (25) create in the region of the depressions of the first wave of the corrugated shape created by applying a layer of foam.

9. The method of claim 8, wherein the first waveform is recorded by a means (30) reception and coordinate the creation of a second waveform, the first waveform using management tools (31), requesting the output signal of the logger.

10. The method according to claim 1, characterized in that after the extrusion of the outer tube (13) has a plot that maintain a constant temperature for the pipeline, in particular in the form of baths (23) for spraying, then carry out the injection deep folds in the pipeline with the set temperature.

11. Corrugated pipe (22) with insulation, produced by a method according to one of items 1 to 10, with at least one inner pipe (2), the foam layer (15) insulation and corrugated outer tube (13) of synthetic material, characterized in that the depth (t) of the corrugation is equal to or greater than 4 mm, and, in particular, is from 4 to 10 mm

12. The pipeline in claim 11, characterized in that the stipulated depression (25) corrugated shape, which basically has a U-shaped cross-section and the top side (26) of the waves of the corrugated shape is generally flat.

13. Machine for manufacturing corrugated pipe with insulation according to the method according to one of items 1 to 10, and the apparatus comprises a device (7, 9) for applying a layer of foam from creating synthetic insulation material, at least one inner tube and the extruder (12) to create the outer tube on the foam layer of synthetic material, characterized in that in the conveying direction of the pipeline at a distance from the extruder provides the location of moulding tools (16-21), which fully extruded tubing can be pressed deep corrugation.

14. Installation according to item 13, characterized in that between the extruder and the location of the molding tools is a site supported with constant temperature, which contains, in particular, the bathtub (23) for spraying.

15. Installation according to item 13 or 14, characterized in that the forming tools forming tools chilled.



 

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The metal hose // 2140036

The metal hose // 2140035

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7 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to rubber industry and can be used for manufacturing log rubber articles, for example hoses. It aims at increasing operating temperature range, and allows using diverse thermoplastic elastomers as outer layer that provide for high adhesive properties. Besides it allows stable colour paint coat, flexibility at low temperature. It allows using thermoplastic polyurethane elastomer or chloroprene elastomer-based glue solution as glue layer of melted glue. As outer layer of thermoplastic elastomer.

EFFECT: production of sleeve-like articles.

1 tbl

FIELD: packing industry.

SUBSTANCE: clamp is manufactured of material having shape of tape or wire. Corrugated profile with the first and second topes following each other is stamped. The first top creates clamp base and accordingly edges of U-shaped bent shelf of clamp adjacent on both sides to the first top. The second top, versus U-shaped form, creates ends of shelves bent outside, to which two adjacent clamps adjoin with the possibility of separation. Besides material of clamp having shape of tape or wire is pierced inside versus U-shaped form, so that convexity of material is formed on internal side of shelf.

EFFECT: improved clamping force of clamp, increased resistance to clamp slipping.

13 cl, 4 dwg

FIELD: chemical industry; methods and the devices for manufacture of the thermoplastic pipe with double walls and the coupling box.

SUBSTANCE: the invention is pertaining to the method and the device for manufacture of the thermoplastic pipe with double walls and the coupling box. The method provides, that the first pipe is extruded into the molding tunnel containing at least one row of the molds directed along the trajectory. Then the first pipe is put into the corrugated shape at least in one of the first areas and is expanding the pipe up to the coupling box at least in one of the second areas. The second pipe is extruded into the first pipe and pressed to the cavity of the corrugations of the first pipe. While the first pipe is put into the corrugated shape and the second pipe is extruded into the first pipe, the space between the two pipes is exposed to action of the pressure of p1, which exceeds the atmosphere pressure. Before expansion of the first pipe up to the coupling box the space between the two pipes is exposed to the action of the pressures of p2 <pl. At that the pressure p2 is the variable value, but the variable is not continuously diminishing. In the process of extrusion of the second pipe into the first pipe, which has already been expanded up to the coupling box, the second pipe is subjected to the action of the pressures p3 inside it, which exceeds the atmospheric pressure, and press the second pipe to the first pipe. Then again they pump the pressure p1 into the space between the two pipes. The invention also presents the description of the device for realization of the method. The invention ensures the accurate molding of the coupling box by the simple means.

EFFECT: the invention ensures the accurate molding of the coupling box by the simple means.

16 cl, 8 dwg

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