RU2312270C2 - Method of manufacturing fiber basalt glass pipe - Google Patents

Abstract

FIELD: pipe manufacturing.

SUBSTANCE: method comprises molding the load-bearing layer and solidifying the load-bearing layer of the pipe with a rotating mold at a temperature of 120-170° C. After solidification of the load-bearing layer of the pipe, the nipples are made, heat insulation is applied on the load-bearing layer of the pipe, and the load-bearing layer is set in rotation together with the heat insulation and is wound on the heat insulation. The heat insulation is made, e.g., of the flexible members or a cylindrical flexible shell. The layer of the outer shell is formed by winding a composition material on the heat insulation. The outer shell is then solidified at a temperature of 15-30°C for 18-26 hours.

EFFECT: enhanced strength and reliability.

1 cl, 9 dwg

Description

This technical solution relates to glass-basalt plastic pipes, including methods for their manufacture.

The method is intended for use in the field of pipe production, mainly for the construction of heat and water communications and for other purposes.

Known pipes made of a composite material based on a binder and roving or fabric containing a load-bearing pipe layer (hereinafter referred to as the carrier layer) located on the carrier layer of the pipe insulation, on which the outer protective sheath is attached [1-6], while in [ 1] thermal insulation is located between the outer shell and the multilayer pipe, in [2] the composite fiber material has a lower polymerization temperature than the preparation temperature for curing the primer layer, in [3] the thermal insulation is made of foam and the ba includes panels of glass-basalt material, in [4] the pipe is made of several layers of various densities and its middle layer connected to adjacent layers of the pipe has a cellular structure, in [6] the thermal insulation is fixed to the pipe by flexible elements covering the pipe.

Known methods of manufacturing pipes that have a carrier layer, insulation and outer shell, each of the known methods includes the operation of winding onto the mandrel a composite material based on an epoxy binder, roving or fabric, forming a carrier layer of a pipe, socket and nipple or socket and socket, or nipple and nipple, curing of the pipe carrier layer [7–9], moreover, in [7], one pipe layer is first made and cured, then the second pipe layer is made and cured, in [8] polymerization is carried out first the outer part of the composite fibrous material layer, and then the rest of the composite fibrous material layer is polymerized, in [9] when the pipe sealing layer is wound, a bell and nipple are simultaneously formed, in [10] one or several layers are sequentially applied to the pipe in the manufacture of the pipe foam with winding on each layer of flexible mesh and protective coating.

Known heat-resistant and fire-resistant pipes made of fiberglass [11-12], while in [11] the pipe has a heat-resistant fibrous glass reinforcement and a non-combustible binder, the inner fiber layer of the glass reinforcement is not impregnated with a binder and forms a fleece, which, if necessary, can be made on the outer surface of the pipe, and in [12] the fiberglass filler is impregnated with a binder and this binder is made of components that prevent combustion.

Known devices for the manufacture of threads at the ends made of composite pipe materials, and the device includes threaded sleeves and dies, which in the process of making threads lead to the end of the pipe [13-14].

A known method of manufacturing a glass-basalt-plastic pipe having a sealing layer of a pipe with a threaded socket and a nipple or a nipple and a nipple, including forming a carrier layer of the pipe, a threaded socket and the end of the pipe under the nipple [10].

A known method of manufacturing the thread of the nipple by deforming the end of the pipe under the nipple by a threaded matrix moving along the pipe during rotation of the latter, introducing a binder into the gap between the threaded matrix and the nipple during the manufacture of the thread of the nipple [15].

The prototype of the method of manufacturing a glass-basalt-plastic pipe is a method of manufacturing a glass-basalt-plastic pipe containing a supporting layer of a pipe having straight and smooth ends or made at the ends of a bell and a nipple, or a bell and a bell, or a nipple and a nipple, thermal insulation and an outer sheath, the method includes a winding operation on the mandrel of a composite material based on an epoxy binder and glass-basalt roving or fabric, molding the carrier layer and its indicated ends, or molding the bell and Pel or socket and socket, or pin and the pin of the carrier pipe curing layer [10].

Known technical solutions do not sufficiently satisfy the current technological conditions for the manufacture of pipes, while the design of pipes made by known methods have unsatisfactory strength and reliability with a relatively high complexity of their manufacture.

The technical result of the method for manufacturing glass-basalt-plastic pipes described in this description is to increase the strength and reliability of pipes and reduce the complexity of their manufacture.

To this end, in a method for manufacturing a glass-basalt-plastic pipe containing a pipe support layer having straight and smooth ends or with a bell and nipple made at the ends, or a bell and a bell, or a nipple and a nipple, thermal insulation and an outer sheath, including a winding operation on a mandrel of a composite material based on epoxy binder and glass-basalt roving or fabric, molding of the carrier layer and its indicated ends, or molding of the bell and nipple, or the bell and the bell, or nipple and nipple, curing the carrier layer I am a pipe, - the socket and the thread of the socket are molded with a mandrel at the same time when forming the bearing layer and curing it, curing the bearing layer of the pipe is performed on a rotating mandrel at a temperature of 120-170 ° C, after the curing of the bearing layer of the pipe, a nipple thread is made, then it is fixed on the bearing layer of the pipe thermal insulation made, for example, from elastic elements or from one cylindrical elastic shell, then on the mandrel rotate the carrier layer of the pipe together with the thermal insulation attached to it and wind it with an interference fit on the thermal insulation said composite material to a state of compression by the composite material of the thermal insulation layer by 5 to 10% of the initial thickness of the thermal insulation layer, while during the winding of the composite material on thermal insulation, at the same time, the outer shell layer is formed, after which the outer shell is cured at a temperature of 15-30 ° C for 18 ÷ 26 hours.

The manufacture of the thread of the nipple is carried out by the method of cutting and grinding it or by the method of plastic deformation of the nipple.

Figure 1 shows a glass-basalt-plastic pipe in one of its designs with thermal insulation from compressed heat-insulating elements (shells), with a bell and a nipple;

figure 2 - fiberglass-plastic pipe with a bell, nipple and heat insulation made of located heat-insulating compressed elements having a cross-sectional segment shape;

figure 3 - glass-basalt-plastic pipe with two sockets and thermal insulation from transversely and longitudinally arranged compressed heat insulating elements;

figure 4 - glass-basalt-plastic pipe with two nipples and thermal insulation from longitudinally and transversely arranged compressed heat insulating elements;

figure 5 - fiberglass-plastic pipe with two nipples and insulation from several longitudinally located insulating compressed elements;

Fig.6 is a glass-basalt-plastic pipe with two nipples and heat insulation from one compressed heat-insulating element having a cross-section in the form of a cut ring;

in Fig.7 - glass-basalt-plastic pipe with a nipple, bell and heat insulation made of one monolithic heat-insulating compressed element molded in the manufacturing process of the pipe;

on Fig - fiberglass-plastic pipe in the second embodiment;

Fig.9 is a diagram explaining a method including the operation of manufacturing a thread of a nipple of a glass-basalt plastic pipe.

A method of manufacturing a glass-basalt-plastic pipe 1 (Fig. 1) having a pipe support layer 2, heat insulation 3 and an outer shell 4, a bell 5 and a nipple 6 with corresponding threads 7 and 8, includes a winding operation (not shown) on a cylindrical mandrel of a composite material on basis of epoxy binder and glass-basalt roving or fabric and molding of the carrier layer 2 of the pipe. In this method, the socket 5 and the thread 7 of the socket are formed by the mandrel 9 while forming the carrier layer 2 of the pipe, while leaving the nipple 6 without thread. The molding of the thread 7 of the socket is carried out by the thread of the mandrel 9 (Fig.9). After said molding of the carrier layer 2 and its named parts, the pipe carrier layer 2, the molded socket 5 and the molded end portion 10 of the pipe carrier layer 2 are completely cured. The end part 10 of the carrier layer 2 of the pipe, intended for the manufacture of thread 8 of the nipple 6 on it, has a length L (Fig. 9).

In this variant of the method, curing of the carrier layer 2 of the pipe on a rotating mandrel 11 in a heat chamber (not shown) at a temperature of 120 ÷ 170 ° C is also provided. After the carrier layer 2 has cured, thermal insulation 3 is mounted on it, made, for example, of a segment in cross section of several elastic elements 9, or thermal insulation is fixed, which is made of one monolithic elastic cylindrical element, as shown in Fig. 7.

After the curing operation, the outer shell 4 of the pipe is made, for which purpose the carrier layer 2 of the pipe is rotated around the axis 12 along with the thermal insulation 3 fixed on it and the specified composite material is wound tightly onto the thermal insulation until the compression layer of the thermal insulation layer 3 compresses in the radial direction of the pipe a value of from 5 to 10% of the initial thickness of the insulation layer 3 (Fig.9). After compression of the insulation layer S1 by the outer shell 4 (FIG. 1), the insulation in the working position of the pipe will have a thickness S.

During the winding of the composite material onto the thermal insulation 3, simultaneously with the compression operation of the thermal insulation, the outer shell 4 is formed from the specified composite material. After performing these operations, the outer shell 4 is cured at a temperature of 15 ÷ 30 ° C for 18 ÷ 26 hours.

After the curing operation, a thread 8 of the nipple 6 is made on the end part 10 of the pipe. The manufacture of the thread 8 of the nipple 6 is carried out by a tool, for example, a cutter, or an abrasive wheel, or a threaded matrix 13 (Fig. 9) having a thread 14. The thread 8 of the nipple 6 can be made by cutting them with the indicated tools or by plastic deformation of the nipple by the threaded matrix 13 forming thread turns during the nipple manufacturing process described below.

The technical result is achieved by selecting the described conditions and modes of pipe production.

Information sources

Pipes made of composite materials, including pipes with thermal insulation and protective outer shells.

1. RU 2224160 C2, 02.20.2004.

2. RU 2211983 C2, 09/19/2003.

3. RU 2115056 C1, 07/10/1998.

4. SU 165366, 09/23/1964.

5. SU 675261, 07.25.1979.

6. SU 365516, 03/23/1973.

Methods of manufacturing pipes from composite materials.

7. RU 2221183 C2, 01/10/2004.

8. RU 2208735 C2, 07.20.2003.

9.SU 1788379 A1, 01/15/1993.

10. RU 2190795 C1, 10.10.2002 (prototype of the method of manufacturing the pipe).

Fire-resistant and heat-resistant pipes made of composite materials.

11. SU 431362, 06/05/1974.

12. SU 843781, 06/30/1981.

Methods and devices for the manufacture of threads at the ends of thermoplastic pipes.

13. SU 559630 C1, 05.25.1977.

14. SU 556041, 04/30/1977.

15. RU 2071915 C1, 01.20.1997.

Claims (2)

1. A method of manufacturing a glass-basalt-plastic pipe containing a pipe support layer having straight and smooth ends or a bell and nipple made at the ends, or a bell and a bell, or a nipple and a nipple, thermal insulation and an outer sheath, the method comprising the operation of winding a composite material onto a mandrel on the basis of an epoxy binder and glass-basalt roving or fabric, molding of the carrier layer and its indicated ends or molding of the bell and nipple, or the bell and bell, or nipple and nipple, curing the carrier pipe layer, characterized in that the socket and the thread of the socket are formed by a mandrel at the same time when forming the carrier layer and curing it, curing the pipe carrier layer is performed on a rotating mandrel at a temperature of 120-170 ° C, after the pipe carrier layer has cured, a nipple thread is made, then attached to for the pipe supporting layer, heat insulation made, for example, from elastic elements or from one cylindrical elastic shell, then, on the mandrel, the pipe supporting layer is rotated together with the thermal insulation attached to it and wound onto The specified composite material is insulated by thermal insulation to a compression state by the composite material of the thermal insulation layer by 5 to 10% of the initial thickness of the thermal insulation layer, while during the winding of the composite material on thermal insulation a layer of the outer shell is simultaneously formed, after which the outer shell is cured at a temperature 15 ÷ 30 ° C for 18 ÷ 26 hours 2. A method of manufacturing a glass-basalt plastic pipe according to claim 1, characterized in that the manufacture of the thread of the nipple is carried out by the method of cutting and grinding or by the method of plastic deformation of the nipple.

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