SU654436A1 - Unit for continuous moulding of tubular articles from foam-plastic - Google Patents

Description

The invention relates to the field of producing porous thermal insulating products from expandable and curing mixtures and in the form of pipes, which can be used in the production of building materials in the chemical and other public goods sectors for the thermal insulation of pipelines.

A known device for the manufacture of heat insulation for pipes, comprising a rotating ring mounted concentrically with respect to a fixed mandrel, onto which a foaming polymer composition is fed and a shaping surface in the form of ribbons arranged around the ring, which moves relative to the longitudinal axis of the mandrel 1.

The disadvantages of this device are: the presence of a paper surface made of paper ribbons, which leads to a complication of the structure, requires stopping due to the paper clogging the gap between the paper bending surface and the mandrel.

For some expandable mixtures, for example, to obtain phenolic foams, the known device works with large intervals required to clean the annular space formed by the outer surface of the mandrel and the inner surface of the tapes.

Also known is an apparatus for continuously forming tubular foam products containing a die made in the form of an outer tube and a mandrel located therein connected to a mixing device associated with the feed system of the initial components 2.

The disadvantages of such an installation are its low productivity and low quality products.

The purpose of the invention is to increase plant productivity and improve product quality.

This is achieved by the fact that the outer tube and the mandrel of the forming head are equipped with a reversible electric drive and are installed rotatably relative to each other and the moving device is made in the form of a labyrinth formed by a system of plates, some of which are fixed on the mandrel and others on the tube and at the exit Forming the head has a fixed knife.

FIG. 1 is a schematic diagram of the installation; in fig. 2 - section aa

in fig. one; in fig. 3 shows a section BB in FIG. one.

The installation consists of a base 1 in which a reversing electric motor 2 is placed, connected by means of a coupling 3 to a mandrel 4. On the mandrel 4, a bevel gear 5 is fixed, which is connected by means of bevel wheels 6 and 7 to the housing 8. The housing 8 is rigidly connected to the outer tube 9 on which a fixed hollow ring 10 is fixed, connected by means of pipelines and gates 11, 12 and 13 with the capacities of the initial components (not shown in the drawing).

The pipe 9 and the mandrel 4 form a forming head with an annular surface. A mixing device in the form of labyrinth-forming plates 14 is located in the feed zone of the initial components, some of which are fixed on the inner surface of the pipe 9 and others on the mandrel 4. A knife 15 is installed at the exit of the moldable pipe, and a conveyor 16 for taking the product. If necessary, cutting into measured segments, the installation is equipped with a cutting mechanism 17.

The installation works as follows.

Include reversing motor 2, which through the clutch 3 transmits to the mandrel 4 rotation and through toothed bevel wheels 5, 6, 7 and the housing 8 to the outer tube 9.

The shut-off valves 11 and 13 are opened, with the valve 12 closed, and the components are fed through a common conduit 18, in which a preliminary displacement of the jet into the jet through the hollow ring 10 takes place to the mixing zone of the pipe 9, where the components are carefully displaced by means of the bias plates. Then the mixture, moving to the end of the pipe 9, foams and cures, taking the form of a hollow cylinder. The molded section is pushed out gradually from the pipe, under the pressure of the supplied components, and passes through the fixedly mounted knife 15, which cuts it into endless shells and prevents the foam pipe from turning due to the rotation of the shaping surfaces.

Next, the shells are picked up by the feed conveyor 16, the speed of which is commensurate with the exit speed of the molded foam pipe, and approaches the cutting mechanism 17, which cuts the shells into segments of a certain length.

During an emergency stop, the shut-off valves 11 and 13 are closed, and the valve 12 is opened and the entire system is flushed with liquid, which is drained through the tank 19 into the sewer.

The presence of a fixed knife of various configurations when the material leaves the molding chamber and makes it possible to obtain a finished product shaped by locks (locks), which reduces the labor intensity during its assembly.

The use of this unit ensures the stability and continuity of leaving the heat insulating material from the molding chamber, the absence of periodic stops for cleaning the molding chamber significantly improves the productivity of the installation and improves the sanitary and hygienic working conditions.

Claims (3)

1. Installation for continuous molding of tubular foam products containing a molding head made in the form of an outer tube and a mandrel located therein, connected to a mixing device associated with the feed component supply system, characterized in that, in order to increase the productivity of the installation and to improve the quality of the products, the outer tube and the mandrel of the forming head are provided with a reversible electric drive and are rotatably mounted relative to each other. 2. The installation according to claim 1, wherein the displacement device is made in the form of a labyrinth formed by a system of plates, some of which are fixed on the mandrel and others on the pipe. 3. Installation according to claim 1, characterized in that a fixed blade is installed at the exit of the forming head. Sources of information taken into account in the examination 1. Patent of the USSR No. 316207, cl. On 29 D 27/00, 1969. 2. USSR Author's Certificate No. 359164, cl. B 29 D 27/00, 1970. - T Aa Figg B b ig.Z