RU168650U1 - DEVICE FOR EXTENSION OF PIPES FROM THERMOUSTAINABLE MATERIAL - Google Patents

Abstract

The inventive utility model relates to the production of products from thermoplastics, namely to the manufacture of heat-shrinkable pipes by the method of expansion of pipes using a pressure differential inside and / or outside the pipe. A device for expanding a tube of heat-shrinkable material consists of a cylindrical caliber case with side openings, an air inlet channel, a cooling jacket, and air supply means. Unlike the prototype, the side surface of the caliber case is covered with an elastic shell, which is hermetically fixed at the edges of the caliber case. The technical result is the elimination of the need to fix the pipe on the caliber body and reduce the total time required to produce one heat-shrinkable pipe. 4 s.p. f-ly, 4 ill.

Description

The inventive utility model relates to the production of products from thermoplastics, namely to the manufacture of heat-shrinkable pipes by the method of expansion of pipes using a pressure differential inside and / or outside the pipe.

The prior art there are many devices that are aimed at creating heat-shrinkable pipes using a differential pressure. The basic principle of operation of these devices is that a heated pipe is placed in an expansion device, then it is exposed to it from the inside with air, or a vacuum is created from the outside, as a result of which the workpiece expands, and after the pipe has been expanded to a predetermined size, it is cooled. The main elements of these devices are: a restrictive cylinder of a given diameter, means for pumping air or creating a vacuum, cooling means.

The prior art device for expanding pipes of heat-shrinkable materials, which consists of a housing divided into two chambers, means for creating a vacuum, means for supplying air, cooling means. A vacuum is created in the first chamber of the casing, and cooled air is supplied to the second in order to cool the pipe, while air is constantly supplied into the pipe from the side opposite to the pipe inlet. In the process, the pipe is introduced into the first chamber, where it expands under the influence of vacuum outside and injected air inside, then the pipe is passed into the second chamber where it is cooled, after which the heat-shrinkable pipe is removed from the second chamber of the device casing [US Patent No. 4104394, IPC A61F 2/06, В29С 55/22, В29С 67/04, В29С 47/54, B01D 39/16, В29С 53/00, В29С 47/24, В29С 47/00, В29С 67/00, F16L 11/04, F16L 11/06, priority date 12/14/1976, publication date 08/01/1978].

The disadvantage of this solution is its complexity, as well as the need to use a large number of compressors to create a vacuum, supply air to the pipe, and supply chilled air to the second chamber.

The prior art device for expanding a pipe of heat-shrinkable material, which contains an expandable rod, the cross section of which is made in the form of a non-convex polygon, air supply, cooling means. In the process, the expandable rod is inserted into the pipe, after which air is supplied to the rod, and it expands until a convex polygon is formed that is close in shape to the cylinder, after which the pipe is cooled and the rod is removed from it [JPS Patent No. 6360698, IPC В29С 53 / 00, В29С 45/00, В29С 55/00, В29С 55/24, В29С 61/06, В29С 61/08, В29K 105/02, priority date 07/15/1982, publication date 11/25/1988].

The disadvantage of this solution is that it does not provide a heat-shrinkable pipe of the correct cylindrical shape, since the use of this solution leads to the formation of angular bulges on the body of the heat-shrinkable pipe.

The closest is a device for expanding a pipe of heat-shrinkable material, which contains a caliber case with side openings, designed to conduct air from the air supply means to the pipe, a cooling jacket, an air inlet channel, air supply means, a heater, fixing elements for fixing the pipe. In the process, a pipe is put on the caliber body, after which it is fixed to prevent air from leaving the pipe. Next, the pipe is expanded and cooled, then the fixing elements are removed and the heat-shrinkable pipe is removed from the device [JPS Patent No. 55142610, IPC В29С 35/12, В29С 45/00, В29С 55/22, В29С 61/00, В29С 61/06, В29С 61 / 08, priority date 04.24.1979, publication date 11/07/1980].

The disadvantage of this solution is the large number of operations performed, in particular, the need to fix each pipe on the caliber body with the help of fixing elements and remove them after receiving a heat-shrinkable pipe, which increases the total time spent on the production of one heat-shrinkable pipe.

The technical problem, which is aimed by the claimed utility model, is to simplify the production of heat-shrinkable pipes.

The technical result is the elimination of the need to fix the pipe on the caliber body and reduce the total time required to produce one heat-shrinkable pipe.

The essence of the claimed utility model is as follows.

A device for expanding a tube of heat-shrinkable material consists of a cylindrical caliber case with side openings, an air inlet channel, a cooling jacket, and air supply means. Unlike the prototype, the side surface of the caliber case is covered with an elastic shell, which is hermetically fixed at the edges of the caliber case.

The elastic sheath fits snugly against the side surface of the caliber body, with the edges of the elastic sheath sealed on the side surface of the caliber body to prevent air from escaping during expansion of the pipe. Fixation at the edges can be made by any known method, for example, vulcanization, clamps, as well as other fixing elements. As the materials of the elastic shell, various polymers can be used, for example, polycaprolactone, polyphosphonitrile chloride, natural rubber or artificial rubber. In this case, the material used must have sufficient elasticity to allow the expansion of the pipes to the required dimensions. The fixation of the elastic shell on the lateral surface of the caliber case should provide sealing and exclude the possibility of air leaving the caliber case with the elastic shell.

The caliber case and the cooling jacket are aligned and can be made of any solid material, for example, thermoplastic, steel, aluminum.

The cylindrical caliber case is hollow, and its ends are closed.

The caliber case can be fixed to the bracket on the side of one of the ends by means of a detachable or one-piece connection, moreover, an annular collar can be additionally made on this end to stop the cooling jacket when putting it on the caliber case.

The holes can be made along the entire plane of the side surface of the caliber case and are designed to allow air to pass from the input channel to the elastic shell through the capacity of the caliber case.

The cooling jacket may be worn on the caliber case in any known manner, for example, manually or by a crane. The cooling jacket may further comprise movable elements that will enable its movement along its axis towards the caliber body and vice versa. Various propulsors, for example, conveyor belt, rollers, wheels, can act as moving elements.

The inner surface of the cooling jacket in cross section is made in the form of a cylinder, and the inner diameter of the cooling jacket is larger than the outer diameter of the pipe and caliber body with an elastic shell.

As a means of cooling a cooling jacket, any known solutions can be used, for example, liquid or thermoelectric cooling.

The base of the cooling jacket and caliber case depends on the specifics of the production. In the case of using the manual method of putting on a cooling jacket, legs can be welded to it. If a method is used to put on a cooling jacket with a crane, a beam crane can be installed on which the cooling jacket is suspended. The fastening of the caliber case must not prevent the cooling jacket and the heat-shrinkable pipe blank from being put on the caliber case.

The inventive utility model has a significant distinguishing feature, which consists in covering the side surface of the caliber case with an elastic shell. This reduces the total time required for the manufacture of one heat-shrinkable pipe, due to the elimination of additional operations to fix the pipe on the caliber body in order to prevent air from leaving the device during pipe expansion. If there is an elastic shell, it is inflated with air, and it, in turn, expands the pipe, which eliminates the need to fix the workpiece on the caliber body, after cooling, the heat-shrinkable pipe is removed from the device without additional operations to remove the fixing fasteners from the heat-shrinkable pipe itself. Due to this, a technical result is achieved, which consists in eliminating the need to fix the heat-shrinkable pipe on the caliber body and reduce the total time required to produce one heat-shrinkable pipe.

The presence of a new distinctive essential feature indicates compliance of the claimed utility model with the patentability criterion of "novelty."

The inventive utility model can be made of known materials using known means, which indicates the compliance of the claimed utility model with the patentability criterion of "industrial applicability".

The inventive utility model is illustrated by the following drawings:

FIG. 1 - General view of a device for expanding pipes from heat-shrinkable materials.

FIG. 2 - Left side view of a device for expanding pipes from heat-shrinkable materials.

FIG. 3 - Device for expanding pipes from heat-shrinkable materials in working condition.

FIG. 4 - Caliber case with elastic shell in the expanded and normal state.

A device for expanding a heat-shrinkable pipe consists of a cylindrical-shaped housing 1 of caliber with side openings 2, moreover, an air supply channel 3, an external cooling jacket 4, air supply means 5 are located at the end of the 1-caliber housing, while the side surface of the 1-gauge housing is covered with an elastic shell 6 .

The casing 1 of the caliber is mounted on the bracket 7 by welding, and on the end of the casing 1 of the caliber, from the side of which it is attached to the bracket 7, an annular bead is made 8. The cooling jacket 4 is located coaxially with the caliber casing 1 on the movable elements 9, which allow the cooling jacket 4 to move along its longitudinal axis in the direction of the housing 1 caliber and vice versa.

The elastic shell 6 is mounted on the housing 1 caliber using the clamps 10.

The device operates as follows.

The heated pipe is put on a 1-gauge case with an elastic shell 6. After this, the cooling jacket 4 is moved towards the 1-gauge case until it completely closes the 1-gauge case, or until it stops in the annular collar 8. Then, using the supply means 5 air into the housing 1 gauge serves air through the channel 3 of the air inlet.

The air accumulated in the housing 1 of the caliber exits through the side openings 2, thereby inflating the elastic shell 6.

When the pipe has expanded to the size of the inner diameter of the cooling jacket 4, it cools due to contact with the cooling jacket 4 and hardens. After that, the cooling jacket 4 is removed and a heat-shrinkable pipe is removed from the 1-gauge body.

Claims (5)

1. A device for expanding a tube of heat-shrinkable material, consisting of a cylindrical caliber case with side openings, an air inlet channel, a cooling jacket, air supply means, characterized in that the side surface of the caliber case is covered with an elastic shell that is hermetically fixed along the edges of the caliber case . 2. A device for expanding a pipe of heat-shrinkable material according to claim 1, characterized in that the elastic shell is fixed at the edges of the caliber body by vulcanization. 3. A device for expanding a pipe of heat-shrinkable material according to claim 1, characterized in that the elastic sheath is fixed along the edges of the caliber body using clamps. 4. A device for expanding a pipe of heat-shrinkable material according to claim 1, characterized in that the elastic shell is made of polycaprolactone. 5. A device for expanding a pipe of heat-shrinkable material according to claim 1, characterized in that the elastic sheath is made of polyphosphonitrile chloride.

Images