RU2548080C2 - Pp pipe welding machine with special safety ring and welding adapter with said special safety ring - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention consists in perfection of safety ring and welding appliance to be used ay welding/jointing with fittings of sandwiched pressure-and-corrosion-resistant plastic pipes of minimized oxygen permeability and heat expansion. Welding machine comprises safety ring enveloping the pipe end surface to make an impermeable barrier, heating resistance plate to hear components to fusion point. Heating rod covers welding adapter with chamber for fused plastic. Internal welding adapter with chamber for fused plastic serves for heating of fitting. Centring tongue of internal and external welding adapters is located at welding machine resistance plate for centring both said adapters in the same direction. Screw is used to secure internal welding adapter at external welding adapter. Fastening bolt serves to secure the internal welding adapter at heating rod. Steel spring serves to facilitate the heating rod removal.

EFFECT: higher tightness of weld joint.

11 cl, 15 dwg

Description

The invention consists in improving the safety ring and welding fixture, which is used when connecting / welding multi-layer, pressure and corrosion resistant plastic pipes with fittings for connecting / welding multi-layer, pressure and corrosion resistant plastic pipes with minimal oxygen permeability and thermal expansion, in which the inner and outer layers are plastic, and the middle layer is of aluminum foil, with fittings, without any additional processing, such as shaving, etc., in Lyakh avoid getting between the plastic and aluminum layers transmitted through the pipe fluid.

Safety ring: This part is one of the main elements of our invention, which is mounted on the end of the pipe, which allows joining / welding without additional processing, such as shaving, hemming, cavitation, etc., of a layer of aluminum foil of a multilayer pipe.

The safety ring melts together with the pipe when the pipe and fitting are heated, covering the surface of the pipe and the aluminum layer with a protective barrier, thus preventing the liquid transferred through the pipe from falling between the aluminum and plastic layers.

Ring holders can be made in various geometric shapes and sizes for various pipe diameters - to facilitate the installation of the safety ring on the pipe.

Connecting / welding fixture: This fixture is one of the main elements of our invention, with the help of various functions it provides liquid-tight insulation of the layers of the connected / welded surfaces of the pipe and fitting, without any additional processing of the aluminum foil of the pipe, such as trimming, cutting edges, cavitation, etc., using a safety ring mounted on the end of the pipe.

BACKGROUND AND APPLICABLE PROBLEMS

In the state of the art used today, thermoplastic pipes and fittings are fused / fused.

Although there are various methods for welding plastic based on the methods used for melting, in all methods used, certain layers of plastic are melted using heat, and these molten parts are joined by pressing one against the other (pressure effect).

The best-selling welding adapters, consisting of male and female parts, as well as bolts and nuts that ensure that these parts are mounted concentrically on the body of the welding machine, are used to fuse the pipe with fitting through heating.

A heater in the welding machine heats the welding adapters. One end (female) heats the portion of the pipe to be inserted into the fitting, and the other end (male) heats the portion of the fitting into which the pipe will be inserted. The pipe and fitting, certain parts of which are melted by heating, are then welded, pressing them to each other.

There are 2 types of plastic pipes with a layer of aluminum foil used for cold water, hot water and heating. The first type consists of a plastic (polypropylene) inner layer through which a fluid stream passes, followed by a perforated or non-perforated foil enclosed between two layers of glue, and a thin protective outer layer of plastic (polypropylene) covering the foil.

The second type of pipe also has an inner and outer layer of plastic raw materials (usually polypropylene), but it has a perforated or non-perforated aluminum layer located in the middle closer to the central point between the inner and outer layers of plastic, and not closer to the outer layer.

For welding with pipe fittings of the first type, the aluminum sheet / layer near the outer surface must be removed using a sharpening / shearing tool.

This operation, used in the existing level of technology, is carried out using a single-knife device that shevages the foil, based on the outer diameter of the pipe. The part of the pipe that can be shewed is inserted into the shaver, and then the shaver is rotated clockwise to perform the shewing operation.

The above system does not provide accurate cutting of the pipe, a new system was developed to remove the foil that is located next to the outer layer of the pipe.

The shaving device described in patent Nr. 2003/01701 shevating pipes both on the outer surface and at the end. The specified sheving device is designed to eliminate cutting errors when shearing the end of the pipe, and reduce the pipe to a welding diameter suitable for existing heating adapters.

Regarding the specified device:

a) The application is difficult and inconvenient due to the large amount of chips generated,

b) An excessively large sheaving surface increases the preparation time,

c) Inadequate shewing can lead to insufficient welding length and poor connection, since the shearing operation depends on the performer,

d) The operation can only be carried out manually, since it is not possible to mount this device on the engine.

Manual shaving requires too much strength and concentration, so it takes a lot of time and increases the loss of time and labor.

Another system was developed in order to address these shortcomings.

Utility Model Certificate Nr. TR 2005 05212 Y describes an automated chewing tool. The foil on the outer surface of the pipe mounted on the motor shaft is moved by a knife mounted above the motor shaft. This device is complex and increases the cost of labor. Moreover, since only the inner diameter is taken as the reference diameter, the system will not work efficiently and the foil will not be sheared as expected due to the displacement of the pipe during shewing.

Chewing foil pipes, as described in the Utility Model Certificate for application Nr. 25 2006/04129, carried out by a device installed in the drill with a pipe mounted on the inner surface of the device; the device rotates when the drill is working, shewing plastic on the outer surface of the pipe and foil near the surface, and the chips are removed through the holes for removing chips. The disadvantage of the device is the lack of a mechanism for attaching the foil pipe to the device, and the pipe is supported only by the inner diameter.

Patent Nr. 2007/00190 solves this problem by using the inner and outer diameters of the pipe from which the foil will be removed as supporting, as well as using a sheving device that prevents the pipe from moving during shewing, increasing the efficiency of the sheving operation.

All of the above systems are solutions offered for welding with pipe fittings, consisting of a plastic (polypropylene) inner layer of the pipe through which the fluid flows, then of perforated or non-perforated foil enclosed between two layers of glue, and a thin protective outer layer of plastic ( polypropylene) - covering, as the topmost layer,

The disadvantages of the above systems, such as the loss of material and time, the mistakes of the performers and the long setup time of the system due to the long preparation time for welding, led to the production of pipes of the second type.

For pipes of the second type, it was proposed to arrange the aluminum layer between the inner and outer layers in order to eliminate the shearing operation on the outer surface of the pipe, which was accordingly performed in production. In this type of pipe, the outer layer is thicker compared to the first type, and also the aluminum layer is located further from the outer surface.

However, in pipes of the second type, like the first type, in order to weld the pipe and fitting, the aluminum layer must somehow be removed or blocked so as to prevent liquid from entering between the layers and thereby prevent damage to the pipe.

With regard to these disadvantages, in the description of the patent Nr. 2005/01801 the sheeting of the aluminum foil layer is carried out “in multilayer composite pipes, during connection / welding of composite pipes with fittings, preferably by welding, using a channel-shaped filling pipe, which allows shewing the surface of the aluminum sheet, which is visible at the end of the pipe and is in plastic, and cover the shevaged volume with plastic filler, while fixing in the fitting is achieved without shewing the aluminum layer together with the inner pipe. "

Welding adapters with a ventilation hole on the female part, as well as a holder directing molten plastic into the pipeline during the welding operation, which can also be used as an alternative to existing welding adapters, are also described in detail in patent Nr. 2005/01801.

In such foil-coated multilayer pipes, due to incomplete cavitation of the pipe or inaccurate shearing of aluminum foil, it may be possible to fill the sheathed pipe with plastic during welding and, as a result, damage and liquid penetration between the layers can occur. It was also noticed that the fluid flowing between the layers leads to the formation of bubbles, due to which the pipes are destroyed.

Another drawback of such systems is that during the heating operation, the pipe and fitting are compressed by human force, and the molten pipe and fitting are removed from the welding adapter by forces in opposite directions. This leads to loss of effort and time, as well as to defects in the process of performing operations.

PROBLEMS RELATED TO CONNECTING / WELDING SYSTEMS WHICH MUST BE ELIMINATED:

a) Chewing standard: depending on the application of a particular person using a shaving knife, it was observed that during the shaving operation, the aluminum foil was not fully sheathed or sheathed to different depths. This may ultimately cause an open or weak spot at the end of the welded pipe or fitting through which fluid may enter.

b) Use of a sheving device: shewing is done by manual pressure and rotation applied by the worker after the sheving device is installed on the end of the pipe. It was noted from pipe breaks that since this operation is labor-intensive, time-consuming and energy-intensive for the worker, the required quality of shewing is not achieved or cannot be achieved.

c) Initiative: as in many cases, the worker who connects the plastic pipe and fitting is the person who has the opportunity to take the initiative during the operation. It is known that in many cases, joining / welding is performed without a shewing operation due to fatigue, shortage or waste of time and labor. This poses a great risk to the consumer.

Inventions should be new and applicable, should require as little initiative as possible, and should be user-friendly.

d) Observation of unsuccessful results: in cases where the inner and outer layers of the pipe are not sufficiently bonded to each other during welding, and therefore water has entered between the layers, it has been observed that bubbles (balls) form under pressure and cause pipe breaks .

e) Waste of material and labor: shaving the ends of the pipe with a layer of foil in the middle can cause imperfections, such as waste of material and time, working defects, increasing the time required for the system to work, and reducing the resistance of the pipe to the ingress of fluid between the pipe and aluminum .

f) Reduction in diameter: plastic melted by heating, depending on the temperature and melting time, can flow into the pipe after welding, which can significantly reduce the diameter of the pipe, or it can propagate through the pipe and lead to poor appearance.

g) Control system: in the present system after installation it is impossible to determine whether the film was sheaved during installation or not.

SUMMARY OF THE INVENTION AND ITS ADVANTAGES:

The scope of this invention is to find the optimal solution to the known problems of the present prior art.

Our invention allows the process of connecting / welding fittings with products known as "multilayer pipes," only when using our invention, a safety ring (Fig. 14), at the end of the pipe and performing a welding operation on a specially designed welding device (Fig. 15) .

Safety ring: in the connecting / welding process for installing products known as “multilayer pipes” with fittings, it provides a seamless connection between the multilayer pipe and fitting using the developed welding fixture that is installed on the pipe.

Connecting / Welding Fixture: Improvements have been implemented on the welding fixture used to connect / weld products that are known as multilayer pipes and fittings. The welding fixture was designed so that it is possible to connect / weld the pipe and fitting using a safety ring mounted on the pipe, and also allow the user to easily separate them from the welding adapter to prepare the conditions for welding work.

It is based on welding the pipe directly with the fitting using a safety ring, made in different colors, from the same material as the pipe, or other materials that are suitable for welding pipes after cutting the middle layer of the foil of the layered pipe with a torch.

During the joining / welding operation, the worker only sets the safety ring on the end of the pipe and performs the operation using the welding fixture according to this invention.

With the help of our invention, the disadvantage of existing systems is eliminated and eliminated, such as fluid leakage between the layers, since the molten plastic cannot completely cover the surface of the aluminum layer due to the mismatch between the shearing of the aluminum layer and the desired size and shape.

The steps for using a connecting / welding system using a safety ring and welding tool are given below.

Stages of the operation:

1 - Pipe: cut the pipe and prepare for welding.

2 - Safety ring: a safety ring that is made of the same material as the pipe, or another material that is suitable for welding with the pipe and which can be made in different colors depending on the needs and in different diameters suitable for pipes, manufactured in an injection machine or other machines.

During the welding operation, the safety ring acts as an insulating barrier, completely covering the pipe cut-off surface, which may come into contact with the liquid.

3 - Safety ring holders: a safety ring is mounted on the end of a flat-cut pipe (Fig. 14) using safety ring holders, which can be one or more geometric shapes and / or sizes, and is prepared for a welding operation.

Since the safety ring is made in a different color than the pipe and fitting, after the welding operation, the holders will be visible between the molten pipe and the molten fitting, which indicates whether the safety ring was used on the pipe surface or not.

4 - Operation: the welding operation according to this invention is carried out using a special welding device and welding adapters.

5 - Heating rod with a heating plate (Fig. 8) (1):

Preheating plate: a safety ring mounted on the pipe using its holders undergoes a preheating process by bringing it into contact with the preheating plate (Fig. 8) (14) before it is inserted into the female part of the welding adapter with the pipe when preparation for welding to ensure attachment to the surface of the cross section of the pipe.

When testing with a heating rod (1), it was observed that when the safety ring (7), which is not attached to the pipe cut surface, (17) was inserted into the female part of the welding adapter (2), the ring was melted in the female part of the welding adapter (2) ) due to heat on the outer surface of the pipe (10), thus separating from the surface of the pipe (17). Refinement was carried out during testing of the heating rod (1) to eliminate this drawback, a preheating plate (14) was attached to the front part and attached to the surface of the pipe (17) of the safety ring (7) installed on the pipe (10) up to installation in the covering part of the welding adapter (2), the result is achieved due to the heating rod (1) with a preheating plate (14).

This operation is not a complete weld. A complete welding operation must be performed on the pipe cut surface (17) and on the pipe itself (10) inside the female part of the welding adapter (2).

The head of the heating rod is made conical (Fig. 8) (13). Using this taper, a certain amount of material of the inner layer of the pipe on the head is melted, which leads to the accumulation of material in the direction of aluminum foil. Since the safety ring also melts in contact with the preheating plate (Fig. 8) (14) and the conical head of the heating rod (Fig. 8) (13), it enters the heat attenuation space (inner layer of the pipe) and the connection is ensured.

If the head of the heating rod were flat rather than conical, it would be difficult for the molten safety ring to enter the inner layer of the molten pipe. The material of the inner surface of the pipe would not accumulate towards (the foil, and the safety ring would not be facing in that direction.

6 - Area of accumulation and distribution of molten material (chamfer): chamfer (Fig. 1, Fig. 2) (11) at the hole in the female part of the welding adapter, which includes a heating rod, which is directed inward at a certain angle, prevents leakage and accumulation ( polypropylene) plastic on the inner surface of the pipe during welding due to the melting of the holders of the safety ring installed on the pipe section and the safety ring itself, when the pipe connected to the safety ring on its cross section (Fig. 14) reaches n lower pole edges by means of force applied to the heating rod a steel spring, thereby preventing the inner diameter of the restriction.

7 - Steel spring: while removing the pipe and fitting from the male and female welding adapters, they are adapted for the connection / welding operation, the pressure is transmitted to the outside by the centering spring of the contact head of the rod inside the female welding adapter, which ensures the following:

but. After attaching the safety ring with the help of its holders to the pipe surface during preliminary heating by the heating rod, the heating rod is installed in the female welding adapter with the help of a steel spring, which ensures melting of the outer surface of the pipe and prepares it for welding.

b. This allows the user to remove the pipe easily, without tearing / separating the attached safety ring from the pipe cut surface.

Advantages of the invention:

a) there is no need to use a manual fixture for shewing the pipe.

b) there is no need for sheving, which can lead to different results depending on the strength of a person and his skill.

c) since the aluminum layer in the middle of the pipe is completely insulated by the safety ring, liquid penetration is completely excluded.

d) while removing the pipe and fitting from the male and female welding adapters, they are adapted for connection / welding, the pressure is transmitted to the outside by the centering spring of the rod contact head, which ensures the following:

- After attaching the safety ring with the help of its holders to the pipe surface during preliminary heating with a heating rod, the installation of the heating rod in the female welding adapter using a steel spring ensures that the outer surface of the pipe melts and prepares it for welding.

- This allows the user to remove the pipe easily, without tearing / separating the attached safety ring from the pipe cut surface.

e) in the present system, since the end of the pipe must be cleaned and connected to the fitting during installation and the welding cut is inside, it is impossible to detect visually whether the foil was completely cleaned or not after installation was completed. To understand whether the foil is cleaned or not, the safety ring, which was made in a color different from the color of the pipe and fitting, was used in the system that we actually invented; this ensures during the welding process visual detection of safety ring holders protruding onto the pipe surface from the outside.

f) The area of accumulation and distribution of molten material (chamfer) (Figure 1) (11), located exactly at the inlet of the opening of the female welding adapter where the heating rod is inserted, serves to uniformly distribute the molten material of the safety ring around the pipe. The accumulation of molten material on the inner surface of the pipe is prevented by these chamfers; therefore, reducing the diameter of the pipe is also prevented.

g) From the leakage observed in known systems, it can be seen that a uniform distribution of the molten material over the sheared aluminum layer cannot be ensured due to the distribution of the molten material mainly in and around the pipe.

In our invention, the molten material will be uniformly distributed from the area of accumulation and distribution of the molten material (chamfer) in the female welding adapter onto the surface of the pipe using a chamfer; and therefore, a significant level of narrowing of the inner diameter of the pipe will not be allowed and inhomogeneous accumulation of molten material on the outside of the pipe, as well as liquid leakage, will be eliminated.

DETAILED DESCRIPTION OF THE INVENTION

A welding machine consisting of a welding adapter with a special safety ring and its parts according to the invention is shown in the accompanying figures. These figures are as follows:

Figure 1: Front view of the female welding adapter

Figure 2: Cross section of the female welding adapter

Figure 3: Front view of a male welding adapter

Figure 4: Cross section of a male welding adapter

Figure 5: Cross section of a safety ring

6: Front view of the safety ring

7: General view of the safety ring

Fig: Front view of the heating rod with a heating plate

Figure 9: Cross section of a heating rod with a heating plate

Figure 10: Front view of the resistance plate of the welding machine

11: Cross section of the resistance plate of the welding machine

12: Top view of an installed welding machine

13: Front view of a dismantled welding machine

Fig: View of the safety ring mounted on the pipe

15: View of a pipe installed in a female welding adapter with a safety ring.

The components and their numbering, including a welding machine comprising a welding adapter with a special safety ring according to the invention, are as follows:

1. Heating rod

2. Female welding adapter

3. Covered welding adapter

4. Heating system set screw

5. Heating rod mounting bolt

6. Steel spring

7. Security ring

8. The resistance plate of the welding machine

9. Fitting

10.Pipe

11. The area of accumulation and distribution of molten material (chamfer)

12. Security ring holders

13. Conical head of the heating rod

14. Preheating plate

15. Threaded hole for installing a heating system

16. Hole for the mounting bolt of the heating rod

17. The cut surface of the pipe

18. Centering tongue of male and female welding adapters.

Mounting the welding machine: the heating rod (1) first passes through the female welding adapter (2), and then through the resistance plate of the welding machine (8), and then through the steel spring (6) and the male welding adapter (3), respectively. All these parts are attached to the heating rod (1) by passing the fixing bolt of the heating rod (5) through the hole for the fixing bolt of the heating rod (16) into the male welding adapter. The female welding adapter (2) and the male welding adapter (3) are attached to the resistance plate (8) with the set screw of the heating system (4), passing through the centering tongue of the male and female welding adapter (18) on the resistance plate. In order to install the female welding adapter (2) and the male welding adapter (3) to each other to set up the system and ensure heat transfer from the resistance plate (8) to the welding adapters: the connection to the resistance plate (8) is made by the set screw ( 4) heating systems through threaded holes (15) for installing the heating system on the resistance plate (8).

Heating and welding operations begin with the installation of the safety ring (7) on the end of the pipe (10) during the joint / welding process.

The preheating process is ensured by bringing the safety ring (7) mounted on the pipe (10) with its holders (12) (Fig. 14) into contact with the preheating plate (14) on the heating rod (1) before insert it into the female welding adapter (2) with the pipe (10) to prepare the welding operation by attaching a safety ring (7) to the pipe cut surface (17).

The female welding adapter (2) is designed specifically to fit the safety ring (7). The male welding adapter (2) is reduced to the size for installation on the pipe (10), and the male welding adapter (3) is reduced to the size for installation in the fitting (9).

An area of accumulation and distribution of the molten material was created on the hole in the female welding adapter (2), where the heating rod (1) enters, in order to prevent the plastic melted during welding from leaking into the inner surface of the pipe (10) and narrowing the inner diameter of the pipe (chamfer) (11) by beveling at an angle inward. This is ensured by the fact that the diameter of the safety ring (7) and its area of accumulation and distribution of molten material (chamfer) (11) is larger than the diameter of the pipe (10) in order to cover the outer surface of the end of the pipe (10) with heated molten plastic, i.e. e. to direct it to the connection with the outer surface of the pipe end (10). Thus, the safety ring (7) gives an initial grip with the outer surface of the pipe (10). The safety ring (7) is then attached to the outer surface of the pipe (10) by heating and melting in the female welding adapter (2).

The difference between the covered welding adapter (3) and the known welding adapters is that it has an opening (16) in its internal part, where the mounting bolt of the heating rod (5) can be inserted. This heating rod mounting bolt (5) and the heating rod itself (1) are attached to the male welding adapter (3) by a steel spring (6), the resistance plate of the welding machine (8) and the female welding adapter (2) through which they pass.

The safety ring (7) connected to the pipe cut-off surface (17) (Fig. 14) is attached to the female welding adapter (2), and the fitting (9) is attached to the male welding adapter (3) to continue the welding operation. The user presses the pipe in his / her hand (10) using a steel spring (b) until it sits in the female welding adapter (2) (Fig. 15), and the fitting (9) on his / her other hand sits in the male welding adapter (3). Meanwhile, the resistance (8) and the heating rod (1) have the melting temperature of the pipe (10) and fitting (9).

Depending on the diameter of the pipe (10) and the temperature level of resistance (8), the inside of the fitting (9), the outside of the pipe (10) and the safety ring (7) on the pipe section (10) are melted for connection.

The fitting (9) and pipe (10) with a safety ring (7) at its end, which are ready for connection, are pulled by the user in the opposite direction, respectively.

The safety ring (7) and molten plastic can become blurred (as in previous systems) when the user pulls out the fitting (9) and the pipe (10) with the safety ring (7). The desired uniform attachment cannot be achieved. In order to prevent this, our invention has a steel spring (6) on the heating rod (1), which provides support in the process of pulling the fitting (9) and pipe (10) with the safety ring (7) from the welding adapters of the welding machine, respectively reverse direction. In addition, the pushing force of the steel spring (6) simultaneously presses the molten safety ring (7) against the pipe (10), preventing it from disconnecting, and provides an effective connection.

The connection / welding operation is completed by the user by connecting the fitting (9) separated from the male welding adapter (3) and the pipe (10) separated from the female welding adapter (2).

In our invention, as described above, a welding machine (similar to others but improved) is used (Fig. 12), pipes (10) and fittings (9) are standard. However, our invention is additionally equipped with a safety ring (7), simply attached to the pipe (10).

This eliminates the need for shewing by the installer of the pipe (10) and, consequently, the expenditure of effort for pressing and rotation in the shewing process.

The pushing force of the steel spring (6) also facilitates the removal of the pipe (10) and the safety ring (7), molten in the welding machine, from the welding adapters for welding with the fitting (9).

Since the end of the pipe (10) is covered by a safety ring (7) in the front of the female welding adapter (2), the ingress of fluid between the layers of the pipe (10) is effectively prevented. Since the safety ring (7) is fused with the pipe (10), the safety ring (7) does not separate from the pipe (10).

Claims (11)

1. A welding machine for plastic pipes, characterized in that it contains a safety ring (7), which covers the entire surface of the cut (17) of the pipe (10) and forms an impermeable barrier, a heating resistance plate (8) that provides heating of the components to the melting temperature , a heating rod (1), covering a welding adapter (2) with a chamber for molten plastic, suitable for the diameter of the pipe (10), a male welding adapter (3) with a chamber for molten plastic, for heating the fitting (9), a centering tongue of a covered and about locking welding adapters (18) located on the resistance plate (8) of the welding machine to center the male and female welding adapters in the same direction, a screw (4) for installing the male welding adapter (3) on the female welding adapter (2), fixing bolt (5) for mounting the male welding adapter (3) onto the heating rod (1) and the steel spring (6) to facilitate removal of the heating rod (1). 2. The welding machine for plastic pipes according to claim 1, characterized in that it contains a safety ring (7), which is characterized in that its holders can have one or more geometric shapes and / or sizes, while the holders (12) exclude falling safety rings (7) from the pipe (10) before welding, allowing it to be held. 3. The welding machine for plastic pipes according to claim 1, characterized in that it contains a safety ring (7), which is characterized in that its holders can have one or more geometric shapes and / or sizes, while the holders (12) exclude falling safety rings (7) from the pipe (10) before welding, allowing it to be held. 4. The welding machine for plastic pipes according to claim 1, characterized in that it contains a safety ring (7), which provides a color melt and has a color different from the color of the pipe and fitting, and it can also be seen between the pipe (10) and the fitting (9) after welding. 5. The welding machine for plastic pipes according to claim 1, characterized in that it contains a safety ring (7), which provides a color melt and has a color different from the color of the pipe and fitting, and it can also be seen between the pipe (10) and the fitting (9) after welding. 6. The welding machine for plastic pipes according to claim 2, characterized in that it contains a safety ring (7), which provides a colored melt and has a color different from the color of the pipe and fitting, and it can also be seen between the pipe (10) and the fitting (9) after welding. 7. The welding machine for plastic pipes according to claim 1, characterized in that the female welding adapter (2) consists of two parts, one of which is the area of accumulation and distribution of molten material (chamfer) (11), preventing leakage and accumulation (polypropylene) plastic raw materials on the inner surface of the pipe (10) during welding on the outer surface of the pipe (10) and on the cut-off surface of the pipe (17) by covering the outer surface of the pipe end (10) with a safety ring (7), fixing it to the outer surface of the end tr (10) and the connection of the pipe (10) with the safety ring (7) on the cut surface of the pipe (17), which is inserted into the hole of the female welding adapter (2), which includes the heating rod (1), which reaches the lower position by force attached to the heating rod (1) by a steel spring (6) during welding of the pipe shear surface (17) and the external surface of the pipe (10), as well as welding of the prepared pipe surface (10) with the fitting (9) by heating the pipe from the external surface . 8. The welding machine for plastic pipes according to claim 1, characterized in that the female welding adapter (2) has an area of accumulation and distribution of molten material (chamfer) (11), including a bevel, which is created in such a way that it forms a diameter, expanding beyond the even area underlying the female welding adapter for welding with a fitting by means of overhead heating, in which the safety ring (7) is attached to the cut surface of the pipe (17), which is inserted into the hole from which the wall protrudes heating rye (1) and reaches the required depth by applying force to the heating rod (1) using a steel spring (6) during the melting of plastic (polypropylene) on the pipe cut surface (17) and the outer surface of the pipe (10); thereby preventing the flow and accumulation of molten plastic (polypropylene) on the inner surface of the pipe (10) and thereby preventing a significant narrowing of the inner diameter of the pipe (10). 9. A welding machine for plastic pipes according to claim 1, characterized in that the heating rod (1) has a pre-heating plate (14) in order to prevent the safety ring (7) attached to the surface from the cut surface of the pipe (17). pipe cut (17), by melting with heat applied to the outer surface of the pipe (10) in a female welding adapter (2), and to ensure its reliable connection to the pipe cut surface (17). 10. A welding machine for plastic pipes containing a heating rod (1) having a preheating plate (14) according to claim 9, characterized in that its end is made conical in order to ensure the accumulation of materials in the direction of the aluminum foil by melting a certain part of the inner surface pipes (10), as well as to ensure the melting of the safety ring (7) by the preheating plate so that it joins the open area (to the inner wall of the pipe). 11. The welding machine for plastic pipes according to claim 1, characterized in that at least one steel spring provides a driving force to the heating rod (1), facilitating the entry of the heating rod (1) into the female welding adapter (2), which allows Without disconnecting the safety ring (7), remove the pipe (10), the outer surface of which is molten in the female welding adapter (2).

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