RU2555467C1 - Method and device of continuous production of non-metal pipes and non-metal pipe - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: glass fibre material impregnated by binding agent is wounded on the rotating self-feeding mandrel with further solidification of the binding agent of the formed pipe shell. Prior to forming of the pipe shell on the mandrel the internal sealing layer of the pipe shell is formed by feeding on the mandrel of the binding agent with further winding on the mandrel of the resin containing tape.

EFFECT: improved tightness of the non-metal pipes.

10 cl, 6 dwg

Description

Application area

The invention relates to non-metallic pipes and to methods and devices for their continuous manufacture by winding a fiberglass material impregnated with a binder onto a rotating self-feeding mandrel followed by curing of the binder.

Prior art

The manufacture of non-metallic (fiberglass) pipes (see, for example, patents Nos. SU885680, RU 2167357 and RU 2221183) can be produced in a continuous way - by winding a fiberglass impregnated with a binder onto a rotating self-feeding mandrel (see patents Nos. SU914299, RU 2323827 and RU 2425753).

In general terms, the method for the continuous production of non-metallic pipes is carried out by winding a fiberglass material impregnated with a binder (see patents Nos. SU 234650, SU 766663, SU 1198482 and RU 47287 U) on a rotating self-feeding mandrel (see patents Nos. SU 378327, RU 2334617) followed by curing the formed shell of said pipe in a polymerization chamber. As a result, a continuous non-metallic pipe is obtained, which is cut using a cutting unit (see patents Nos. SU 1426790, SU 234650) to produce a non-metallic pipe of a given length.

The non-metallic pipe shell obtained by the indicated continuous method has layers with a slanting longitudinal-transverse structure (see Fig. 3).

For the implementation of these methods, continuous production of non-metal pipes are used (see, for example, patents Nos. SU 234650, SU 378327, SU 729076, SU 729077, SU 994276, SU 1229064, SU 1388310, SU 1502389, RU 2055734, RU 2209731 and RU 2236350).

In general terms, a device for the continuous production of non-metallic pipes contains a rotating self-feeding mandrel, means for winding a protective film on said mandrel, means for laying fiberglass material impregnated with a binder on a mandrel for forming a shell of a continuous pipe, polymerization chambers in which the binder of said pipe shell is cured followed by obtaining a formed continuous pipe, a cutting unit of the formed continuous pipe.

The practice of operating non-metal pipes obtained using this method shows that pipes have high strengths of the order of 120 MPa and up to 250 MPa, but do not have a sufficiently high tightness, since regardless of the structure of the layers of the shell of the non-metal pipe:

1) in the pipe wall material, there will inevitably be monolayers stretching across the fibers, which leads to an “increase” in the deformation of the binder compared to the deformation of the pipe shell material, i.e. the material is stretched due to a more malleable binder compared to fibers. This leads to the appearance of microcracks (and, consequently, loss of tightness) long before the exhaustion of the load-bearing capacity of the pipe shell material;

2) any highly reinforced fiberglass-reinforcing fiber has porosity, because in the process of forming a shell of a non-metallic pipe, it is practically impossible to remove air from a fiberglass material (fiberglass), replacing it with a binder. This circumstance also reduces the tightness limit of non-metallic pipes reinforced with continuous fibers. Considering the above, in the manufacture of such pipes for working at internal pressure (for example, for transporting liquid), it is necessary to manufacture shells with a large wall thickness, avoiding large operational stresses (and, as a consequence, deformations).

Therefore, according to the prior art, the tightness of the non-metallic pipe is ensured by various formation of layers of the non-metallic pipe, which leads to an increase in the weight of the non-metallic pipe, energy consumption for the manufacture of the non-metallic pipe and the cost of its transportation.

It should be noted separately that to increase the tightness of the pipe, various methods of forming shell layers are used.

The essence of the invention

The objective of the proposed invention is to increase the tightness of non-metallic pipes and the development of a method and device for their production.

Another objective of the proposed invention is to improve the manufacturing quality of non-metallic pipes, the shell of which contains layers of oblique longitudinal-transverse structures obtained by the continuous production of non-metallic pipes by winding on a rotating self-feeding mandrel.

Other objectives and advantages of the proposed invention will be discussed below as the present description and drawings.

Thus, in the known method for the continuous production of non-metallic pipes by winding a glass fiber material impregnated with a binder onto a rotating self-feeding mandrel with subsequent curing of the binder formed shell of the said pipe according to the invention, before forming the pipe shell on said mandrel, an inner sealing layer of the pipe shell is formed by applying to the mandrel binder followed by winding onto the mandrel of the resin-consuming tape.

The formation of the inner sealing layer of the pipe shell on the basis of the resin-containing tape provides a significant increase in the tightness of the obtained non-metallic pipes with layers of a cross-layer longitudinal-transverse structure. The inner resin-filled sealing layer can undergo significantly greater deformations, which ensures an increase in the sealing properties of the obtained non-metallic pipe according to the proposed invention.

Also, according to the proposed invention, for example, a fiberglass material with good absorbent resinous properties, for example glass veil, is used as a resin-absorbing material.

The use of the resin-containing tape ensures good absorption of the binder located on the mandrel, which does not allow the binder to leak out during winding of the resin-containing tape on the mandrel, which ensures the effective formation of the inner sealing layer.

Also according to the proposed invention, in which the resin-containing tape is laid on a mandrel coated with a binder, with at least double overlap, which provides an increase in the thickness of the inner sealing layer, and all of the above can significantly reduce the thickness of the power (bearing) layer of the pipe shell wall, which leads to reducing the weight of the pipe and, accordingly, the costs of its manufacture, cutting and transportation.

Also known is a device for the continuous production of non-metallic pipes, comprising a rotatable mandrel, means for winding a protective film on said mandrel, means for laying glass fiber material impregnated with a binder on a mandrel for forming a shell of a continuous pipe, polymerization chambers for curing the binder of said pipe shell and obtaining a formed continuous pipe, cutting block formed by a continuous pipe, according to the claimed invention, the device additional o contains a node for supplying a binder to the mandrel covered with a protective film, and with the possibility of rotation around the mandrel by means of a drive plate with coils of resin-picking tape for winding on the coated mandrel mandrel.

Using the proposed installation provides the formation of a shell of a non-metallic pipe with an internal sealing layer based on a resin-based tape, which is more pliable than the rest of the pipe shell, which contains layers of a cross-layer longitudinal-transverse structure.

Also according to the proposed invention, in which the device further comprises a system for forming an internal sealing layer, which consists of a control unit, which is connected at the input to the rotation sensor of the mandrel, and at the output, the control unit is connected to the drive of the faceplate.

Using the control system of the means of forming the inner sealing layer also allows you to control the ratio of the turns of the inner sealing layer and the rest of the pipe shell, which contains layers of a slanting longitudinally transverse structure.

Also according to the proposed invention, the node supplying a binder to the mandrel contains a flow controller of the binder.

Also, according to the proposed invention, the control unit is additionally connected at the output to the binder flow regulator, which makes it possible to maintain optimal binder consumption during the formation of the inner sealing layer.

Also known non-metallic pipe, the shell of which contains at least one layer of oblique longitudinal-transverse structure obtained by the above-mentioned method for the continuous manufacture of non-metallic pipes, according to the proposed invention, the shell of said non-metallic pipe contains an inner sealing layer based on an impregnated resin band.

The use of an internal resin-filled sealing layer based on an impregnated resin-containing tape will significantly increase the tightness of the pipe due to its high resistance to deformations that occur during operation of a non-metallic pipe. The increase in the sealing properties of the pipe will reduce the wall thickness of the shell while maintaining the specified tightness limit, which will reduce the material consumption of the pipe and the cost of cutting and transportation, which is an advantage of the invention.

Also according to the proposed invention, as a resin-absorbing tape, for example, a fiberglass material with good absorbent resinous properties, for example glass fiber, is used. The use of fiberglass material with good absorbent resinous properties will effectively form the inner sealing layer of the pipe.

Also, according to the proposed invention, the resin-containing tape is laid with at least double overlap, which provides an increase in the thickness of the inner sealing layer and a significant decrease in the thickness of the power (bearing) layer of the pipe shell wall, which reduces the weight of the pipe and, accordingly, the cost of its manufacture and transportation .

Figures

When considering embodiments of the present invention, narrow terminology is used. However, the present invention is not limited to the accepted terms and it should be borne in mind that each such term covers all equivalent elements that work in a similar way and are used to solve the same problems.

Figure 1 - shows a device for the continuous manufacture of non-metallic pipes.

FIG. 2 - fragment I of FIG. one.

FIG. 3 is a sectional view of a shell of a continuous pipe according to the prior art.

FIG. 4 is a sectional view of a shell of a continuous pipe according to the invention.

FIG. 5 is a first embodiment of a control scheme for forming an internal sealing layer.

FIG. 6 is a second embodiment of a control scheme for forming an internal sealing layer.

Implementation example

In figures 1 and 2 shows: the main drive 1, a rotating self-feeding mandrel 2, the means of winding 3 on the mandrel 2 of the protective film, the feed unit 4 of the binder on the mandrel 2, the flow controller 5 of the binder, drive 6 faceplates 7 with coils 8 of resin tape 9. Tools laying 10 fiberglass impregnated with a binder material on the mandrel 2, polymerization chambers 11, non-metallic pipe 12, cutting block 13, control unit 14, rotation sensor 15 of the mandrel 2.

In FIG. 3 shows a cross section of the shell of a continuous pipe 12 according to the prior art, the shell of which consists of a layer 12 ₁ oblique longitudinally transverse structure.

In FIG. 4 shows a cross-section of the shell of a continuous pipe 12 according to the proposed invention, the shell of which has a layer 12 _{1 of an} oblique longitudinally transverse structure and an inner sealing layer 12 ₂ based on a resin-impregnated tape.

In FIG. 5 shows a first embodiment of a control circuit for forming an internal sealing layer, according to which the control unit 14 at the input is connected to the rotation sensor 15 of the mandrel 2, and at the output, the control unit 14 is connected to the drive 6 of the faceplate 7.

In FIG. 6 shows a second embodiment of a control circuit for forming an internal sealing layer, according to which the control unit 14 at the input is connected to the rotation sensor 15 of the mandrel 2, and at the output, the control unit 14 is connected to the drive 6 of the faceplate 7 and to the binder flow controller 5.

The work of invention

Through the main drive 1, a rotating self-feeding mandrel 2 comes into operation. By means of winding 3 on the mandrel 2, a protective film is wound, which prevents contamination of the mandrel 2 with a binder (see Fig. 2). The binder is fed to the mandrel 2 in the protective film through the feed unit 4, while the flow rate of the binder is controlled by the regulator 5. Then, the binder layer 9 is wound onto the binder layer on the mandrel 2 using the faceplate 7 with coils 8, which interacts with the binder and absorbs it and thereby prevents it from flowing out during winding of the resin-absorbing tape 9. As a result of winding of the resin-containing tape 9, an inner sealing layer 12 _{2 of} the pipe shell 12 is formed.

After the formation of the inner sealing layer 12 ₂ , the subsequent formation of layers 12 _{1 of the} shell of the pipe 12 is carried out by subsequent winding on the mandrel 2 of the fiberglass impregnated with a binder using laying means 10, and then the formed shell of the pipe 12 is fed into the polymerization chambers 11 in which curing takes place binder resulting in the formation of a continuous non-metallic pipe 12, the shell of which has a layer 12 ₁ oblique longitudinally-transverse structure and an inner sealing layer 12 ₂ (see. Fig. 4) on the basis of the impregnated resin tape 9.

Then, the formed continuous non-metallic pipe 12 is cut off by a cutting unit 13 into pipes of a given length.

It should be separately noted that during the operation of the proposed invention, the control system for forming the inner sealing layer 12 ₂ consists of a control unit 14, which is connected at the input to the rotation sensor 15 of the mandrel 2. Based on the data on the rotation of the mandrel 2, the control unit 14 determines the flow rate of the binder for forming the inner sealing layer 12 ₂ and generates a control command to the regulator 5, which sets the required flow rate of the binder, which is fed to the mandrel 2.

Also, on the basis of data on the rotation of the mandrel 2, the control unit 14 determines the rotation speed of the faceplate 7 to provide the necessary winding of the adhesive tape 9 on the mandrel 2 when forming the inner sealing layer 12 ₂ . After that, the control unit 14 produces a control command to drive 6 of the faceplate 7.

Technical result

The technical result of the proposed invention is to increase the tightness of non-metallic pipes, the shell of which contains at least one layer of a slanting longitudinal-transverse structure, obtained by the method of continuous manufacture of non-metallic pipes, by winding a glass-fiber material impregnated with a binder onto a rotating self-feeding mandrel with subsequent curing of the binder.

Claims (10)

1. A method for the continuous manufacture of non-metallic pipes by winding a glass fiber material impregnated with a binder onto a rotating self-feeding mandrel with subsequent curing of the binder formed shell of said pipe, characterized in that before forming the pipe shell on said mandrel, an inner sealing layer of the pipe shell is formed by applying to the mandrel binder followed by winding onto the mandrel of the resin-consuming tape. 2. The method according to claim 1, in which, for example, a fiberglass material with good absorbent properties of resinous substances, for example glass veil, is used as the resin-absorbing material. 3. The method according to any one of the above paragraphs. 1 or 2, in which the resin-containing tape is laid on a mandrel coated with a binder, with at least double overlap. 4. A device for the continuous manufacture of non-metallic pipes according to the method claimed by any of the above paragraphs. 1-3, comprising a rotatable mandrel, winding means on said mandrel of a protective film, means for laying fiberglass material impregnated with a binder on a mandrel for forming a continuous pipe sheath, polymerization chambers for curing the binder of said pipe sheath and obtaining a formed continuous pipe, cutting block formed continuous pipe, characterized in that the device further comprises a node for supplying a binder to the mandrel coated with a protective film, and with the possibility rotation around the mandrel by means of the drive of the faceplate with coils of the resin-taking tape for winding onto the binder-coated mandrel. 5. The device according to claim 4, which further comprises a control system for forming an internal sealing layer, which consists of a control unit, which is connected at the input to the rotation sensor of the mandrel, and at the output, the control unit is connected to the drive of the faceplate. 6. The device according to any one of the above paragraphs. 4 or 5, in which the node supply of the binder to the mandrel contains a flow control of the binder. 7. The device according to claim 6, in which the control unit is additionally connected at the output to the flow controller of the binder. 8. Non-metallic pipe, the shell of which contains at least one layer of a slanting longitudinal-transverse structure, obtained by the method of continuous manufacture of non-metallic pipes, characterized according to any one of the above paragraphs. 1-3, characterized in that the shell of the aforementioned non-metallic pipe contains an inner sealing layer based on impregnated resin tape. 9. A pipe according to claim 8, in which, for example, a fiberglass material with good absorbent resinous properties, for example glass veil, is used as a resin-curing tape. 10. The pipe according to any one of the above paragraphs. 8 or 9, in which the resinous tape is laid with at least double overlap.

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