RU2083905C1 - Fibrous composite material pipe with metal end branch pipes, method of manufacture and device for realization of this method - Google Patents

Abstract

FIELD: pipe column for production of ferromanganese concretions from deep depths. SUBSTANCE: steel pipes overload columns and there is danger of their break in course of operation. Proposed glass-reinforced plastic pipes are provided with metal branch pipes which are connected by means of threaded joints. Thread has special profile in form of rectilinear section and undercutting where rod bent by conical spiral is located, fibres of material of pipe are wound around this rod in layers through 180 deg. Branch pipes are fitted in pipe in pairs after preliminary matching points of thread finish on technological tool on which they are fitted by one generatrix. Motion screw has right-hand and left-hand threads whose pitch is equal to pitch of thread of branch pipes. Right-hand and left-hand carriages are moved from center to sides, thus ensuring regular structure of joint. EFFECT: enhanced reliability. 4 cl, 3 dwg

Description

 The invention relates to mechanical engineering and can be used in the construction of ship, trunk oil and gas pipelines; mast antennas, supports and racks, console mounted to the base, high-voltage switches, etc.

 It can be of particular value in the manufacture of pipes experiencing mainly axial tensile loads, for example, in a pipe stand for the extraction of iron-manganese nodules and directional drilling systems for oil and gas wells. For most of these products, according to operating conditions associated with the need for frequent connection and disconnection of such pipes, the inclusion of various fittings and pump units in the pipelines, it is most preferable to connect the pipes to each other using metal pipes firmly connected to the pipe made of fiber composite material ( RMB).

There are many known solutions for connecting metal flanges and pipes to a PCM pipe. Closest to the proposed design of the connection, the method of its implementation and the device for implementing the method, adopted as prototypes [1-3]
The aim of the invention is to eliminate the disadvantages of the prototype solutions, expanding the capabilities and significantly increasing the strength and reliability of the connection of pipes from PCM with metal pipes in the predominant operation of the structure in tension.

The goal is achieved by the fact that in the pipe known for the prototype, the threads on the pipes are made in different directions with a profile in the form of a rectilinear section with a rounded undercut, in which there is a rod bent along a conical spiral with layers of pipe composite material wrapped around it by 180 ^° in increments in radial direction equal to the thickness of the layer of wrapped fibers.

 In addition, the magnitude of the undercut is made not less than the sum of the dimensions of the diameter of the rod and half the thickness of the layer of fibrous material wrapped around it; first, the right and left metal pipes with the location of the points of the vanishing threads on one generatrix are fastened to the tooling-mandrel, and then the rods are wound into the threaded undercuts of the pipes simultaneously with the fiber composite pipe material; the device is equipped with special handlers associated with movable carriages, which are connected to the lead screw, on one part of which is made the right and the left thread on the other.

 The above set of general and private essential distinguishing features of the group of inventions ensures the achievement of the purpose of the invention.

 The presence of conical threads of different directions in the nozzles allows, in the process of winding the pipe, to attach it to the nozzles in one operation (i.e. more quickly) so that the rods and layers of fibrous material are laid along the thread from the bottom up at the same time.

The rectilinear section of the profile makes it possible to make the transition of the metal into the composite quite smooth and to avoid the peak of stresses at the interface between them during operation of the pipe in bending; the undercutting together with the spiral-curved rod with the composite material fibers wrapped around it by 180 ^° helps to form a reliable lock from which the longitudinal fibers cannot escape, because this would require breaking the rod and the layers of pipe material on top.

 The adopted step of arranging the turns of the rod in the radial direction, equal to the thickness of the layer of wrapped fibers, makes it possible to smooth out the undercut after this filling with the rod flush with the rectilinear section of the thread profile and thereby make the material structure in the joint area more ordered.

 The preliminary location of the entry points of the thread on one and the other nozzles on the same generatrix of the pipe (or its technological equipment) allows to simplify the operation of simultaneous winding of the nozzles; winding simultaneously with the core of the layers of fibrous material just allows you to form a lock in the undercuts, which gives the necessary tensile strength to the entire connection.

 The presence of two lead threads in different directions on the lead screw allows two carriages to move in different directions when the lead screw rotates in one direction at the same time and with a step equal to the thread pitch on the nozzles, and therefore, the exact and simultaneous formation of the connection of both nozzles and the pipe.

 In FIG. 1 shows a General view of the pipe with nozzles and a node for their connection; in FIG. 2 node l in FIG. one; in FIG. 3 device for performing the proposed connection and method.

 The connection includes metal pipes 1 and 2 with a tapered thread 3 on its outer surface, along which they are connected to a pipe 4 of a fibrous layered composite material. The connection can be either detachable or one-piece in the latter case, an adhesive layer (not shown) is located at the boundary of the composite and the metal. The conical thread 3 has a profile in the form of a straight segment 5 and an undercut 6. The fibrous material 10, wrapping around a rod 9, enclosed in an undercut 6, forms a reliable lock that provides a strong connection of the pipe composite and the metal pipe during tensile and bending loads. The pitch of the thread 7 in the axial direction is constant and is determined by calculation; the pitch of the thread 8 in the radial direction is also constant and equal to the thickness of the wrapped rod around the fibrous material 10.

 One of the options for implementing the proposed connection design is the use, for example, of glass cloth, in which weft threads cover a bundle of warp threads on the edges. In this case, the bundle of these warp threads, filling when undercut 6 is wound after polymerization of the binder, forms a rod 9 curved in a conical spiral.

 In the second embodiment, the glass cloth or tape is located on the thread of the nozzles with a folded edge in each layer, in the fold 11 of which the prefabricated rod 9 is located. In this case, the upper part of the fold 11 is pressed from above by the lower part of the upper layer of fibrous material.

 The pipe and its connection with the nozzles are as follows.

 On the technological mandrel 12 (Fig. 2), pipes 1 and 2 are fixed at the ends so that the thread run-off points on their surfaces are located on the same generatrix. Rolls 13 of fibrous material are placed with some overlap on the fixed 14 and movable 15, 16 carriages. The latter are set so that the edge of the material is right on the right carriage and left - on the left and the rod 9 enclosed in it is at the vanishing points of the thread (undercutting). When you turn on the mechanism 17 rotation of the mandrel, he simultaneously turns the lead screw 18, having on one of its parts the left and the other right thread with the same step as the nozzles. The rotation of the screw leads to the movement of the carriages 15 and 16 in different directions, as shown by arrows 19, and the rotation of the mandrel to rewind the material from the rolls 13, as shown by arrows 20. From special rails 21, rods 9 are wound, moving along the axis of the mandrel together with the carriages 15 and 16. In this case, the width of the cuts 22 will remain constant, and the cuts 23 will change, remaining more than a certain minimum value.

 At the end of the winding, the composite material of the pipe wall is subjected to heat treatment, after which the finished pipe is removed from the dressing.

When a tensile force is applied to the nozzle, the fibers of the material tend to stretch and tear the rod 9 out of the undercuts 6. Due to the high strength of the rod (up to 200 kgf / mm ² ) and the regularity of its holding all the fibers of the layered material, reliable transmission of force from the nozzle to the pipe is ensured.

Claims (4)

1. A pipe made of a fibrous composite material with metal end pipes connected to it by a conical thread, characterized in that the thread on the pipes is made in different directions with a profile in the form of a rectilinear section with a rounded undercut, in which there is a rod curved along a conical spiral with wrapped around 180 ^{o in} layers of fiber composite material of the pipe and step in the radial direction equal to the thickness of the layer of wrapped fibers.  2. The pipe according to claim 1, characterized in that the magnitude of the undercut is made not less than the sum of the dimensions of the diameter of the rod and half the thickness of the layer of fibrous material wrapped around it.  3. A method of manufacturing a pipe from a fibrous composite material with metal end pipes, including the operation of winding layers of fiber material of the pipe and between them winding along the helical line of the glass fiber, followed by curing in the binder material and attaching to the pipe ends by conical threading of metal pipes, characterized in that first, the right and left nozzles with the location of the points of the vanishing threads on one generatrix are fastened on the tooling-mandrel, and then wound rods into the threaded undercuts of the nozzles simultaneously with the fibrous composite pipe material.  4. A device for manufacturing a pipe from a fibrous composite material with metal end pipes, comprising a mechanism for supplying fibrous material in the form of movable and stationary carriages, a removable mandrel and a screw screw connected to a rotation drive, characterized in that it is equipped with special handlers associated with movable carriages that are connected to the lead screw, on one part of which the right thread is made, and on the other, the left thread.

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