RU81121U1 - FRAME FOR PRODUCING PIPES FROM fiberglass - Google Patents

Abstract

Usage: in construction, engineering and other industries in the production of pipes from composite materials. The utility model solves the problem of expanding the technological capabilities of the mandrel for the manufacture of corrugated pipes. The mandrel consists of a rigid core 1 mounted rotatably on supports 2 from the drive 3. On the surface 4 of the core 1, the sheath 5 is fixed at the ends directly to the surface 4 of the core 1, and between the ends through discretely installed flexible connections 6. Between the surface 4 and sheath 5 in the zone of installation of flexible connections 6 is formed pneumatic chamber 7, connected by a pipe 8 through the control device 9 with the supply line of the working medium. Removable annular elastic elements 12 are fixed to the sheath 5 from the outside. From the pressure in the annular pneumatic chamber 7, the sheath 5 is inflated to tension the annular elements 12, and in the interval between them, to the tension of discretely installed flexible connections 6, forming a corrugated surface. A glass filler impregnated with a binder is wound around the sheath 5, forming a corrugated fiberglass pipe 13. After the binder is cured, the pressure in the pneumatic chamber 7 is released, while the flexible connections 6 are bent, the sheath 5 is reduced in diameter and the pipe 13 is removed from the mandrel.

Description

The utility model relates to equipment for the processing of polymeric materials and can be used in construction, engineering and other industries in the production of fiberglass pipes and other composite materials.

Closest to the technical nature of the claimed object is a mandrel for the continuous production of pipes from a polymeric material, in particular fiberglass, containing sections with rigid cores, on the surface of which are mounted sliding supports of elastic shells in the form of annular pneumatic chambers connected through a control device to the medium supply line [1]. With this mandrel, when applying pressure to the pneumatic chambers, its outer diameter increases slightly, fiberglass can be applied to the mandrel, and after curing, reduce the pressure in the pneumatic chambers, the diameter of the mandrel will decrease and the pipe will be removed from the mandrel.

However, annular pneumatic chambers made of elastic shells do not provide stability of the outer diameter of the mandrel, and it is impossible to produce more rigid and economical corrugated pipes on such a mandrel, since the surface of the shell becomes smooth due to the pressure of the working medium.

The utility model solves the problem of expanding the technological capabilities of the mandrel for the manufacture of corrugated pipes.

To do this, in the mandrel for the manufacture of fiberglass pipes containing a rigid core, on the surface of which is mounted an elastic sheath fixed to it, connected through a control device to the medium supply line, according to a utility model, removable annular elastic elements are fixed over the sheath.

Smooth pipes are made on the mandrel without ring elastic elements. In the presence of annular elastic elements, the shell at the place of their installation is inflated less from the pressure of the working medium, forming hollows of corrugations. When the pressure is released, the shell is compressed to a diameter smaller than the depression of the corrugations, so it is easily removed from the mandrel.

Figure 1 shows a longitudinal section of the mandrel, figure 2 is a fragment of a longitudinal section during winding of the pipe, figure 3 is the same during removal of the pipe from the mandrel, figure 4 is a transverse section during removal of the pipe from the mandrel .

The mandrel consists of a rigid core 1 mounted rotatably on supports 2 from the drive 3. On the surface 4 of the core 1, an elastic sheath 5 is fixed at the ends directly to the surface 4 of the core 1, and between the ends through discretely installed flexible connections 6. An elastic sheath 5 can be made of plastic or reinforced rubber. Flexible connections 6 can be installed both radially and randomly at different angles to the radial direction. A pneumatic chamber 7 is formed between the surface 4 of the core 1 and the sheath 5 in the area of flexible couplings 6, connected by a pipe 8 through a control device 9 to a medium supply line, for example, a compressed air pipeline 10 and a vacuum line 11. Removable are fixed to the sheath 5 from the outside ring elastic elements 12. On the mandrel is formed by winding a fiberglass pipe 13.

The device operates as follows. Before winding from the control device 9 through a pipe 8 into the annular pneumatic chamber 7 is supplied under pressure a working medium, such as air. From the pressure in the annular pneumatic chamber 7, the shell 5 is inflated to the tension of the ring elements 12, and in the interval between them - to the tension of discretely established flexible connections 6, which limit the inflation of the shell, making its diameter stable. In the place of installation of the ring elements 12 increases the rigidity of the shell

and, due to the pressure of the working medium, the shell 5 here is inflated less, forming corrugations on the surface of the shell 5.

A release coating is applied to the corrugated surface of the shell 5 and the ring elements 12, and in this position, a glass filler impregnated with a binder is wound on the shell 5, forming a corrugated fiberglass pipe 13. When winding, the stretched flexible connections 6 keep the shell 5 from being displaced relative to the core 1, increasing the resistance of the mandrel to action torsional loads. After curing the connecting pipe 13 through the control device 9, the pressure in the pneumatic chamber 7 is released and it is connected to the vacuum line 11. In this case, the flexible connections 6 are bent and the sheath 5 is reduced in diameter, as a result, a gap is formed between the sheath 5 and the pipe 13 and the pipe 13 is easily removed from the mandrel. The removal of the pipe 13 from the mandrel is possible without connecting the pneumatic chamber 7 to the vacuum line 11, but only when the pressure is released.

By changing the stiffness of the removable ring elements 12 and the step of their arrangement, it is possible to obtain shells with different corrugation profiles.

Compared with the prototype of the inventive mandrel has advanced technological capabilities and is suitable for the manufacture of both smooth and corrugated fiberglass pipes by winding.

INFORMATION SOURCES

1. Mandrel for the continuous manufacture of pipes from a polymer material: Sv-in on PM 3719 of the Russian Federation: IPC 6 V29C 53/83. - Announced on 04/01/96; publ. 03.16.97, Bull. No. 3 (prototype).

Claims (1)

A mandrel for the manufacture of fiberglass pipes, containing a rigid core, on the surface of which a flexible shell fixed to it is mounted, connected via a control device to the supply line of the working medium, characterized in that removable ring elastic elements are fixed over the shell.