Method and a device for production of a thermoplastic pipe with double walls and production of a connective coupling

FIELD: production of thermoplastic pipes with double walls and connective couplings.

SUBSTANCE: the invention is dealt with a method and a device for production of thermoplastic pipes with double walls and connective couplings. The method of production provides, that the first pipe is extruded into a molding tunnel containing at least one row of folds directed along a trajectory. The first pipe is configured as a corrugated pipe at least on one of the first sections and the pipe is made wider up to the size of the connective coupling at least on one of the second sections. The second pipe is extruded into the first pipe and pressed into the cavities of the first pipe crimps. During the time period, when the first pipe is configured as a corrugated pipe and the second pipe is extruded into the first pipe, the space between the two pipes is subjected to the action of pressure p1, which exceeds the atmospheric pressure. Before the first pipe making wider up to the connective coupling the space between the two pipes is subjected practically to the constant pressure p2 < p1. In the process of extrusion of the second pipe into the first pipe, that has been already widened up to the size of the connective coupling, the second pipe is subjected to action of the pressure p3, exceeding the atmospheric pressure, then it is pressed to the first pipe. Then the pressure p1 is again fed into the space between the two pipes. The device for realization of the method is also presented. The invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

EFFECT: the invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

16 cl,8 dwg

 

The invention relates to a method and apparatus for manufacturing thermoplastic tubes with double walls and coupling.

A method of this type is known, for example, from European patent EP 0563575 A2. In this way the pipe ekstragiruyut in forming a tunnel containing at least one series of forms designed by the trajectory. The first pipe attach corrugated form at least one first segment and the first pipe extends to the education of the coupling, at least one second site. The second pipe ekstragiruyut in the first pipe and press to the troughs of the corrugations of the first pipe, thereby forming the composite tube containing the outer tube and the inner tube welded to it. At that time, when the first pipe attach corrugated shape and a second pipe ekstragiruyut first, the space between the two pipes is subjected to a pressure P1 higher than atmospheric pressure. The pressure P1 is chosen such that after cooling pipes, which are welded to each other at the troughs of the corrugations, the inner tube was not bulging inward or outward between these points. After cooling pipe pressure should return to atmospheric pressure.

The first pipe attach corrugated shape by the application outside pressure that is below atmospheric pressure. The pressure P1 to ensure Ecevit maintaining the corrugated shape of the first pipe, but, as a rule, it is only quite slightly higher than atmospheric pressure to prevent bulging of the inner pipe to the outside during the cooling of the pipe, as described above.

According to European patent EP 0563575 A2 first pipe extends to the education of the coupling on the second areas by creating outside low vacuum. After expansion of the first pipe for the formation of the coupling space between the two pipes ventilate until reaching atmospheric pressure.

During extrusion of the second pipe into the first pipe, which was extended to the education of the coupling, the second pipe with the inner side is exposed to pressure P3 higher than atmospheric pressure, and pressed against the first pipe. This ensures that in the zone of coupling two pipes will be welded to each other over the entire surface.

After coupling is formed from both pipe and the second pipe is again extruded to the surfaces of the troughs of the corrugations of the first pipe at the other first section of the first pipe, the pressure P1 is again fed into the space between the two pipes.

The impact of outside low vacuum on the first pipe for the formation of the coupling in accordance with European patent EP 0563575 A2 difficult because space is between the first pipe and the corresponding plot of the molding tunnel must be effectively sealed against ingress of air from outside. If the sealing of this type does not exist or it is incomplete, will not be achieved the exact extension of the first pipe at a corresponding site of the coupling. The required sealing necessitates the adoption of complex technical solutions.

The objective of the invention is to develop a method and device for manufacturing thermoplastic tubes with double walls and coupling, in which a perfect extension of the first pipe for the formation of the coupling on the appropriate section of the molding tunnel is provided with simple tools.

In accordance with the invention this object is achieved by means of the characteristics described in paragraph 1 of the claims. Due to the fact that at a certain time before or after expansion of the first pipe before the formation of the coupling space between the two pipes is exposed to essentially constant pressure P2≤P1 higher than atmospheric pressure, or AC, but nepreryvno decreasing pressure P2, the first pipe is fully extended for the formation of the coupling on the site of the molding tunnel, designed for this purpose. There is no need for exposure to outside low vacuum on the first pipe for the formation of the coupling, which requires a germ is the dimension of the space between the first pipe and the molding tunnel. However, forming the tunnel may have channels to exhaust air at the corresponding sections, which are formed of the coupling. However, they only provide an effective low vacuum from the outside of the first pipe when it is in contact with the molding tunnel an entire section of the coupling.

In accordance with the invention, the pressure P2 set such that the first pipe was extended right up to the coupling on the affected area. If the pressure P2 is too low, the first pipe does not extend to the coupling or expanded enough. On the other hand, if the pressure P2 is too large, the first pipe is stretched during extrusion so that it will have a smaller wall thickness at the beginning of the couplings and larger wall thickness at the end of the coupling. Excessive pressure may cause rupture of the first pipe in the process of expanding it to the coupling.

Thus, the pressure P2 is preferably set such that the first tube is fully expanded to the coupling on the second site and had essentially constant wall thickness throughout the area.

To this end, it may be appropriate to maintain the pressure P2 is essentially constant in the process of formation of the coupling. When STD is bound profiles forming tunnels in the area, designed for the coupling, and the standard values of the wall thickness of the first pipe is preferable that the pressure P2 was less than P1. If the height of the profile grooves for coupling in forming the tunnel is small and/or if the wall thickness of the first pipe is large, the pressure P2 may be essentially equal to P1. It may be appropriate that at the end of the process of shaping the first pipe in the recess for coupling the pressure P2 exceed p1.

Typically, the pressure P2 can be variable, but not continuously decreasing in the extrusion process of the two pipes in the recess for the coupling provided in the molding tunnel to ensure that the first tube is fully extended to the coupling on the affected area and will have a constant wall thickness.

The pressure P3, which acts on the second pipe during its extrusion in the first pipe (which has already been extended to the coupling) and provides for pressing the second pipe to the first pipe may be stepwise increased, so that it initially has a lower value, and then a higher value in order to ensure the expansion of the second pipe. The pressure P3 can be changed, for example, two phase or linear, at least in the initial phase.

Time for change on the means P1 to the pressure P2 is preferably chosen so that the pressure P2 in the space between the two pipes exceeds a specified value during expansion of the first pipe to the coupling. If the pressure P2 is reached very quickly, the pressure switch P1 to pressure P2 immediately before the first extension pipe to the coupling. If the pressure P2 is reached only after a certain period of time, the pressure switch before the extension of the first pipe in accordance with this interval.

Switching pressure P1 to the pressure P2 at a certain point in time, it is preferable depends on the position of the forms provided with a recess for the coupling relative to the direction in which ekstragiruyut first pipe in corrugated form or shape of the coupling.

In order to ensure the effective welding of the second pipe to the first pipe, the pressure P3 is served to the inner side of the second pipe in a pre-specified time before the extrusion of the second pipe into the first pipe, which has already been extended to the coupling.

This time can be determined using specified forms provided with a recess for the coupling relative to the direction of extrusion.

To regulate the pressures P1, P2 and P3 may be provided by the recognition that the form took some specified state is on its trajectory, and may provide for the regulation of the pressure values P1, P2 and P3 on the basis of this detected information. In addition, data that provide the possibility of determining the distance that moved form the trajectory can be determined, and the pressure P1, P2 and P3 can be adjusted using this detected information.

The device according to the invention, which ensures that the operations of the method described above, has the characteristics described in paragraph 6 of the claims.

The compressed gas regulator connected to the first channel for supplying gas, can be equipped with a pressure regulator, which can regulate the pressure of gas into the space between the two pipes.

Instead of regulating the pressure of gas into the space between the two pipes, open-loop or closed-loop controller, the compressed gas may have a flow meter, which provides regulation of the volume of gas into the space between the two pipes, open-loop or closed-loop.

For regulating the pressure or volume of gas open-loop or closed-loop can be provided by the device for measuring pressure, designed for measuring the pressure prevailing in the space between the two pipes.

For exact R is the regulation of the pressures P1 and P2 in the space between the two pipes can be provided by the sensors, designed for measurement of gas temperature in the space between the two pipes and/or temperature of thermoplastic material of the pipes. The regulator, compressed gas is preferably such that the gas pressure or gas volume required to achieve the pressures P1 and P2 may be set based on the value of the temperature.

In another design of compressed gas regulator according to the invention, intended for the two channels for supplying gas, can be installed and preferably may be subject to a certain pressure differential between P1 and P2.

For actuation of the compressed gas regulators on the outer side of the form can be made label and may provide for a fixed sensor, with which the label can be detected at a certain position of a form on its trajectory. In this case, the control device provided by the program, which provides actuation of the compressed gas regulators based on the mark detection sensor.

In particular, the label may consist of protrusions or recesses on the outer side of the form, and the sensor can be a proximity switch.

For actuation of the compressed gas regulators may provide a pulse generator that generates pulses, the time difference between them depends on the distance that moved form their trajectories during this time difference. The pulses are detected by the control device that has a program providing for actuation of gas regulators on the basis of these pulses.

In addition, the control device can be designed so that it allows you to set the variable values of the flow of thermoplastic material, respectively extrudable through two of the mouthpiece of the extruder, and/or to adjust the speed of the forms on their path.

Practical examples of the invention are described below based on the drawings, on which:

figure 1 is a longitudinal section of part of the extrusion head and the molding tunnel before manufacture of the coupling;

figure 2 is a longitudinal section of part of the extrusion head and the molding tunnel at the beginning of the manufacture of the coupling;

figure 3 is a longitudinal section of part of the extrusion head and the molding tunnel in the extrusion process of the first pipe in the recess for the coupling in forming the tunnel;

4 is a longitudinal section of part of the extrusion head and the molding tunnel in the extrusion process of the second pipe into the first pipe, which was extended to the coupling;

5 is a longitudinal section of part of the extrusion head and the molding tunnel in the extrusion process of the second tube after the formation of the coupling on the first pipe;

6 is a longitudinal section of part of the extrusion head and the molding tunnel after the formation of the coupling;

Fig.7. scheme of the regulation of the pressures P1, P2 and P3 open-loop; and

Fig - image compressed gas regulators.

Figure 1-6 illustrates significant stages in the process stipulated in the manufacture of thermoplastic pipe with double walls and coupling.

At the stage shown in figure 1, the first pipe 1 ekstragiruyut through the first mouthpiece 2 in the extrusion head 3 in the molding tunnel 4 and give it a corrugated shape on the first segment.

As shown in Fig.7, the molding tunnel 4 contains two rows of circulating forms 5.

Figure 1 additionally shows that the second pipe 6 ekstragiruyut through the second mouthpiece 7 of the extrusion head 3 in the first pipe and pressure to the cavities 8 of the corrugations of the first pipe 1. During the extrusion head 3 in the direction of manufacture is calibrating mandrel 9, intended for the second pipe 6, which may be provided with a cooling device (not shown).

At that time, when the first pipe 1 attach the corrugated shape and the second pipe 6 presses the depressions 8 of the corrugations of the first pipe 1 and are welded thereto, the space between the two tubes 1 and 6 is exposed to the pressure P1, which is greater than atmospheric pressure. The pressure created by the compressed gas supplied from the first supply channel 10 gas located between the d is uma the mouthpieces 2 and 7 on the extrusion head 3.

The pressure P1 set such that after cooling, the two tubes 1 and 6, the pressure in the intermediate space 11 between the two pipes is returned to the atmospheric pressure value, to ensure that the second pipe is not to have any vypuchivaniya in the joints with cavities 8 of the corrugations of the first pipe 1.

At the stage of the process, shown in figure 2, the first mouthpiece 2 of the extrusion head 3 has reached the beginning of the recess 12 for the coupling in forming the tunnel 4, which corresponds to the coupling, while the second mouthpiece 7 is still opposite the site of the molding tunnel 4, which forms the corrugated wall 13 forms. The first pipe 1 extending from the first mouthpiece 2, extends at the end of the recess 12 for coupling located in the area of manufacturing, due to the fact that the pressure switch P1 at essentially constant pressure P2 lower than p1. The pressure P1 in the space between the two tubes 1 and 6 are chosen so that during the subsequent molding process for the formation of the coupling tube 1 was uniformly pressed against the grooves 12 for coupling and had a constant wall thickness throughout the coupling.

Figure 3 shows a stage in the method, when the second mouthpiece 7 of the extrusion head 3 has reached the beginning of the notches 12 of the molding tunnel 4, PR is naznachennoe for the coupling, in the area of manufacturing, while still happens extrusion of the first pipe 1 in the recess 12 for the coupling. The pressure P2 is still served in the space between the two tubes 1 and 6. The pressure P2 provides a uniform pressing of the first pipe 1 to the recess 12 for the coupling. Channels for exhaust air (not shown)provided in the forms corresponding to the recess 12 for the coupling, essentially do not create vacuum from the outside of the first pipe 1 up until the first pipe 1 will not come into contact with the recess for the coupling. Figure 3 is a front zone in the direction of manufacture. In the area in which the first pipe 1 extending from the first mouthpiece 2, extends in the direction of the recess 12 for the coupling, but has not yet made contact with her, there is not enough vacuum for forming the coupling 1, since only the air coming into the area between the first pipe 1, the extrusion head 3 and the molding tunnel 4, is discharged through the channels to exhaust air. Therefore, the molding of the coupling 1 is essentially occurs through the pressure P2 in the space between the two pipes.

As shown in figure 3, the pressure P2 is set such that the first pipe 1, extrudable through the first mouthpiece 2, extended side of the recess 12 for connecting mu is you, but without the risk of over-stretching it, which would lead to a smaller wall thickness of the pipe 1 at the beginning and in the middle of the recess 12 for coupling to a shift of thermoplastic material in the opposite direction and thereby to increase the wall thickness at the end of the recess 12 for the coupling, which is turned in the direction opposite to the direction of manufacture.

For effective welding of the second pipe 6 to the first pipe 1, which was extended to the coupling on the stage in the process of implementation of the method, which is shown in figure 3, through the second channel 14 for supplying gas to the inside of the second pipe 6 serves the pressure P3 higher than atmospheric pressure. In the initial phase, the pressure P3 set such that the second pipe 6 is slightly expanded in the recess 12 to the coupling without excessive stretching.

During later phases, shown in figure 4, where the second pipe 6 is subjected to expansion for the formation of the coupling, the pressure P3 increases for optimum welding the second pipe 6 to the first pipe 1. The pressure P2 in the space between the two tubes 1 and 6 still maintain essentially constant. It is important that the phase shown in figure 3, which is the formation of both tubes 1 and 6 to the coupling was prescribed is but the regulation of the pressures P2 and P3 open-or closed-cycle to maintain the specified pressure differential between P2 and P3. This leads to uniform durable fusion of the two pipes 1 and 6 in the zone of the coupling.

Figure 5 shows a subsequent stage of the method, which again is the extrusion of the first pipe 1 in the plot with a corrugated wall 13 forms, while the second pipe 6 is still expanding for the formation of the coupling. At this point, the pressure P2 is still served in the space between the tubes 1 and 6, while the second tube 6 is pressed against the first pipe 1 due to internal pressure P3.

In the state shown in Fig.6, the forming of the coupling is completed on the first pipe 1 and the second pipe 6. Cease to apply pressure P3 applied to the inner side of the second pipe 6, and the pressure P1 is again fed into the space between the two tubes 1 and 6, to ensure that the second pipe 6 will be as smooth as possible, and will be welded to the bottoms 8 of the corrugations of the first pipe 1 after cooling of thermoplastic material in forming the second pipe 6 is using a calibrating mandrel 9 for the formation of a smooth inner wall. This mode is maintained until and unless such site, as shown in figure 2, as the continued application data the process.

In the molding process of the first corrugations of the pipe 1, as shown in Fig.6, a higher pressure may initially be fed into the space And to ensure optimal filling of the first depressions of the corrugations form 5 of thermoplastic material before proceeding with the implementation of the method at a lower pressure P1.

7 shows the regulation of the pressures P1, P2 and P3 using the sliders 15 and 16 of compressed gas connected to the first channel 10 for supplying gas and the second channel 14 for supplying gas through the device 17 controls for switching regulators 15 and 16 of the compressed gas at certain points in time.

Compressed gas for creating pressures P1, P2 and P3, served on highway 18 for compressed gas regulators 15 and 16 of compressed gas. The controller 15 compressed gas creates pressure P1 and pressure P2 in the space between the two tubes 1 and 6 using the gas emerging from the outlet of the first channel 10 for supplying gas, while the controller 16 of the compressed gas is intended to create pressure P3 applied to the inner side of the second pipe 6 by means of compressed gas emerging from the outlet of the second channel 14 for supplying gas. Switching regulators 15 and 16 of the compressed gas at certain points in time is performed by the device 17 controls as described below.

As shown in figure 1-6, switching on the areas P1, P2 and P3 at certain points in time, depending on the position of the notches 12 of the molding tunnel 4, intended for the education of the coupling relative to the extrusion head 3, in particular regarding the mouthpieces 2 and 7. In its simplest switch at certain points in time can be performed using non-contact sensors located in front of the recess 12 for the coupling and behind it (in the direction of manufacture). However, if the set value of the pressure at a certain time should be changed and this is done by using the closed-loop control, it is advisable to recognize engage in a particular form 5 pre-set position to its closed path of travel and to manage synchronized regulation of the pressures P1, P2 and P3 using this detected information.

To this end tag, such as a protrusion or a recess on the outer side of the form, may be provided on the outer side of the form 5, with a stationary sensor 19, in this case, a proximity switch can detect the situation when the form 5 reaches a predetermined position. The device 17 has a program that allows switching regulators 15 and 16 of compressed gas, depending on the position recognition sensor 19.

The program control device 7 takes into account the desired geometry of the trajectories of moving forms 5, which form closed contours, and, in particular, the provision of forms, which form the recess 12 for the coupling. Regulation of the pressures P1, P2 and P3 on the stages of the method described above, and in particular to those shown in figure 2, 3 and 6, may be made on the basis of the recognition given position of the form 5 unit 17 of the control.

Repeated detection of a specified position of a form 5 sensor 19 causes the re-launch of the program control device.

In addition, there may be a pulse generator 20, which transmits impulses to the device 17 is a sequence of two pulses depends on the move forms at a certain distance. The pulse generator may generate the pulses, for example, depending on the frequency of rotation of the toothed wheel or the distance at which it is turned in the direction of rotation, the gear rejects circulating number of forms 5, and the pulse generator can transmit data pulses to the device 17 controls. These pulses can be defined distance from the location of the forms forming the recess 12 for the coupling to the position on the path of forms, corresponding to the switching pressure P1, P2 and P3, and the pressure switch is performed as described above. D. tcic 19 again serves to initiate recognition or re-run the procedure.

Using the pulse generator 20 can be aware of the speed change forms 5 on their trajectories circulation.

The device 17 controls may additionally have a device to change the speed of movement forms 5 on their path through the program that controls the switching of the pressures P1, P2 and P3 automatically, i.e. without recognition, machine data, which depend on the movement of forms 5 at a certain distance.

On Fig shows a practical example of the implementation of the controllers 15 and 16 of compressed gas to switch between pressures P1 and P2, and P3 at certain points in time. Compressed gas required to create pressures P1, P2 and P3, served on highway 18 for compressed gas through distribution pipelines connected to the controllers 21 and 22 of the pressure. The gauges 23 and 24 located behind the knobs 21 and 22 of the pressure along the gas flow, measure the pressure of gas leaving the pressure regulators and the findings are reported in the error correction block (not shown in Fig)inside the controllers 21 and 22 of the pressure. However, since the correction blocks, as shown in Fig, operate at a lower pressure by means of compressed gas fed through line 18 for compressed gas, you need a device 25 or 26 for pressure reduction, adjustment, which in practical application is e, shown here, can be performed manually.

In addition, can be provided by sensors (not shown in the drawings) for temperature measurement gas existing in the space between the two pipes, and/or temperature of thermoplastic material of the pipes 1 and 6, and the regulation of gas pressure required to achieve the pressures P1 and P2 in the space between the two pipes can be carried out on the output side of the sliders 15 and 16 of the compressed gas using temperature values.

In addition, the device 17 controls (not shown Fig), United with regulators 21 and 22 of the pressure, may be performed so that a pressure differential can be established between the pressures P2 and P3 with the knobs 21 and 22 of the pressure.

List of reference numbers

1 - the first trumpet,

2 - the first mouthpiece

3 - extrusion head,

4 forming the tunnel

5 - form,

6 - second trumpet,

7 - second mouthpiece

8 - the hollow flute,

9 - calibrating mandrel,

10 - the first channel for supplying gas,

11 - the intermediate space between the two tubes,

12 - slot couplings,

13 - corrugated wall of the form,

14 - second channel for supplying gas,

15 - regulator compressed gas,

16 - compressed gas regulator,

17 device management

18 - line for compressed gas

19 - sensor

20 - pulse generator,

21 pressure control,

22 is a pressure regulator

23 - gauge,

24 - gauge,

25 is a device for lowering the pressure,

26 is a device for lowering the pressure,

And the space between the two pipes.

1. A method of manufacturing a thermoplastic pipe with double walls and coupling, in which

a) a first pipe ekstragiruyut in forming a tunnel containing at least one series of forms designed by the trajectory;

b) a first tube attached corrugated form at least one first segment and extends to the coupling of at least one second site;

c) a second pipe ekstragiruyut in the first pipe and pressed against the trough of the corrugations of the first pipe;

d) at the time when the first trumpet give a corrugated shape and a second pipe ekstragiruyut in the first pipe, the space between the two tubes is exposed to the pressure P1, which is greater than atmospheric pressure;

e) before the first extension pipe to the coupling space between the two pipes is exposed to essentially constant pressure P2<P1;

f) in the extrusion process of the second pipe into the first pipe, which has already been extended to the coupling, the second pipe is subjected inside vozdeistviyami P3, exceeding atmospheric pressure, and pressure to the first pipe and

g) in the space between the two pipes then served the pressure P1.

2. The method according to claim 1, characterized in that the pressure P1 is changed to a pressure P2 immediately before the first extension pipe to the coupling.

3. The method according to claim 1 or 2, characterized in that the pressure P3 is served to the inner side of the second pipe in a pre-specified time before the extrusion of the second pipe into the first pipe, which has already been extended to the coupling.

4. The method according to one of claims 1 to 3, characterized in that specify the position of a form on the trajectory of its movement and for this information to regulate the pressure values P1, P2 and P3.

5. The method according to claim 4, characterized in that to determine the distance moved form the trajectory of their movement, and for this information to regulate the values of the pressures P1, P2 and P3.

6. The method according to one of claims 1 to 5, characterized in that the end extensions of the first pipe to the coupling pressure P2 set higher than the pressure P1.

7. Device for manufacturing thermoplastic tubes with double walls and a coupling containing

A) forming a tunnel that includes at least one series of forms designed by the trajectory has a corrugated wall forms at measures which, one of the first site and the recess for coupling the corresponding coupling at least one second site;

B) an extruder with an extrusion head in which the extrusion head has a first mouthpiece designed for the extrusion of the first pipe in the molding tunnel, and the second mouthpiece located at the first mouthpiece in the direction of movement of the molds in the molding tunnel and designed for the extrusion of the second pipe;

C) a first channel for supplying gas, located between the two mouthpieces, and a second channel for supplying gas, an opening in the second mouthpiece in the direction of movement of the forms of the molding tunnel;

(E) compressed gas regulator connected to the first channel for supplying gas to a pressure P1 and essentially constant pressure P2<P1 or AC, but not continuously decreasing pressure P2 by means of compressed gas emerging from the outlet of the first channel for supplying gas into the space between the two pipes, and the pressure P1 and P2 exceeds atmospheric pressure;

F) the controller of compressed gas connected to a second channel for supplying gas to a pressure P3 higher than atmospheric pressure, with the inner side of the second pipe by means of compressed gas emerging from the outlet of the second channel for supplying gas;

G) the management designed to manage compressed gas regulators so that before the first extension pipe to the coupling space between the two pipes is exposed to essentially constant pressure P2<P1 higher than atmospheric pressure in a controlled manner.

8. The device according to claim 7, characterized in that the compressed gas regulator connected to the first channel for supplying gas, equipped with a pressure regulator that provides regulation of the pressure of the compressed gas into the space between the two pipes.

9. The device according to claim 7, characterized in that the compressed gas regulator connected to the first channel for supplying gas has a flow meter, which provides regulation of the volume of gas into the space between the two pipes.

10. The device according to claim 8 or 9, characterized in that a device for measuring the pressure in the space between the two pipes.

11. Device according to one of PP-10, characterized in that there are sensors designed to measure the temperature of the compressed gas in the space between the two pipes and/or temperature of thermoplastic material, and compressed gas regulator, designed to set the gas pressure or gas volume required to achieve the pressures P1 and P2 in the space between the two pipes on the basis of Zn the values of the temperature.

12. Device according to one of claims 7 to 11, characterized in that a pressure differential between P2 and P3 can be set to two channels for supplying gas through the regulator compressed gas.

13. Device according to one of claims 7 to 12, characterized in that the mark is on the outside of the form and a stationary sensor for detecting the label at a particular position of a form on its trajectory, the control device provided by the program, which provides actuation of the compressed gas regulators based on the mark detection sensor.

14. The device according to item 13, wherein the label consists of a protrusion or recess on the outer side of the form and the sensor is a proximity switch.

15. Device according to one of claims 7 to 13, characterized in that there is a pulse generator that generates pulses, the sequence of which depends on the form of moving a certain distance on their trajectories, and passes them to the control device, the control device has a program that provides actuation of the compressed gas regulators on the basis of these pulses.

16. Device according to one of claims 7 to 15, characterized in that the control device provides the ability to specify variable values of the flow rate of thermoplastic mA is Arial, accordingly extrudable through two of the mouthpiece of the extruder, and/or to adjust the speed of the forms on their path.



 

Same patents:

The invention relates to aviation and can be used for the manufacture of caps on the output of the pipeline .The essence lies in the fact that the cover has a honeycomb structure for changing the direction of release of fluid from the pipeline with sloping cells and triangular frame element to stiffen the structure

The invention relates to the manufacture of special products from substances in a plastic state, and in particular to methods of manufacturing corrugated tubular products, and is intended for use in the manufacture of predominantly large, deep (150 mm) of the corrugations of the bellows, hoses, etc

The invention relates to a tubular product, the method of extruding a multilayer product and device for its implementation

FIELD: production of extruded shaped profiles by coextrusion of different materials.

SUBSTANCE: the invention is pertaining to the device for production of extruded shaped profiles by coextrusion of different materials, in particular, to production of the shaped profile at least with three passing in parallel and spaced from each other partitions. The device contains at least two extruders giving out various materials. The extruders are coupled accordingly through the first and the second units with several through channels feeding the various materials. The device has three longitudinal outlet slots: two external primary outlet slots and one middle secondary outlet slot. Each external primary outlet slot is coupled to one of the first through channels going out from the first unit. The middle secondary outlet slot is coupled to two secondary through channels going out from the second unit. Between two second channels there is one primary channel. Additionally through channels are going out from the first unit. The channels are passing to the additional outlet slots passing in the transversal edge field at least of one of the primary external outlet slots. The invention ensures feeding of the extruded material in the required amount through the rather wide slots passing in parallel to each other.

EFFECT: the invention ensures feeding of the extruded material in the required amount through the rather wide slots passing in parallel to each other.

5 cl, 1 dwg

FIELD: tire industry; production an element of a pneumatic tire based on rubber mixtures.

SUBSTANCE: the invention is pertaining to the field of the tire industry and may be used at production of an element of a pneumatic tire based on rubber mixtures, two of which one form a tire tread. The method of production of an element based on the rubber mixtures and intended for production of a pneumatic tire provides for extrusion of at least two layers of the rubber mixtures with the help of the main extruder supplied at least with two extrusive feed screws having accordingly the channels of outflow opening into one and the same hole of then extruder limited by the first and the second walls of a plate. Then using extrusion simultaneously through two layers interpose at least one insert made out of the rubber mixture with the help of a microextruder nozzle. The nozzle of the microextruder is pressed to the second wall of the plate of the main extruder. The device for extrusion of the rubber mixtures has the main extruder with an extrusion head with at least two outflow channels for each of two rubber mixtures. The channels are going in one and the same hole of the extruder, through which the two rubber mixtures are extruded. The hole of extrusion is limited by the first and the second walls of the plate. The device contains at least one microextruder intended for extrusion of the third rubber mixture. The head of the microextruder on its end is supplied with a nozzle, which is inserted in the first wall of the plate of the main extruder so, that the nozzle is placed in the hole of the main extruder and pressed to the second wall of the plate of the main extruder so, that to feed the third rubber mixture into a profiled structure, made out of the rubber mixtures coming out of the main extruder. The invention allows to produce elements of the tire out of rubber mixtures.

EFFECT: the invention ensures production of elements of the tire out of rubber mixtures.

7 cl, 3 dwg

The invention relates to an extrusion device for manufacturing foam-filled plastic hollow profile cross-section which has at least one hollow profile section

The invention relates to a method of manufacturing a multilayer composite material containing a layer of plastic having non-adhesive properties relative to the adhesive substances, and materials, creating a non-adhesive properties, are located inside the layer of plastic

The invention relates to a method of manufacturing a multi-layered coextruded containing a layer of plastic having non-adhesive properties relative to the adhesive substances, and materials, creating a non-adhesive properties, are located inside the layer of plastic

The invention relates to the extrusion of food products

Composite material // 2214921
The invention relates to thermoplastic composite materials, in particular materials having a layer of acrylic resin

The invention relates to a multilayer film, intended for packaging of stacked modules, as well as how you can get

FIELD: tire industry; production an element of a pneumatic tire based on rubber mixtures.

SUBSTANCE: the invention is pertaining to the field of the tire industry and may be used at production of an element of a pneumatic tire based on rubber mixtures, two of which one form a tire tread. The method of production of an element based on the rubber mixtures and intended for production of a pneumatic tire provides for extrusion of at least two layers of the rubber mixtures with the help of the main extruder supplied at least with two extrusive feed screws having accordingly the channels of outflow opening into one and the same hole of then extruder limited by the first and the second walls of a plate. Then using extrusion simultaneously through two layers interpose at least one insert made out of the rubber mixture with the help of a microextruder nozzle. The nozzle of the microextruder is pressed to the second wall of the plate of the main extruder. The device for extrusion of the rubber mixtures has the main extruder with an extrusion head with at least two outflow channels for each of two rubber mixtures. The channels are going in one and the same hole of the extruder, through which the two rubber mixtures are extruded. The hole of extrusion is limited by the first and the second walls of the plate. The device contains at least one microextruder intended for extrusion of the third rubber mixture. The head of the microextruder on its end is supplied with a nozzle, which is inserted in the first wall of the plate of the main extruder so, that the nozzle is placed in the hole of the main extruder and pressed to the second wall of the plate of the main extruder so, that to feed the third rubber mixture into a profiled structure, made out of the rubber mixtures coming out of the main extruder. The invention allows to produce elements of the tire out of rubber mixtures.

EFFECT: the invention ensures production of elements of the tire out of rubber mixtures.

7 cl, 3 dwg

FIELD: production of extruded shaped profiles by coextrusion of different materials.

SUBSTANCE: the invention is pertaining to the device for production of extruded shaped profiles by coextrusion of different materials, in particular, to production of the shaped profile at least with three passing in parallel and spaced from each other partitions. The device contains at least two extruders giving out various materials. The extruders are coupled accordingly through the first and the second units with several through channels feeding the various materials. The device has three longitudinal outlet slots: two external primary outlet slots and one middle secondary outlet slot. Each external primary outlet slot is coupled to one of the first through channels going out from the first unit. The middle secondary outlet slot is coupled to two secondary through channels going out from the second unit. Between two second channels there is one primary channel. Additionally through channels are going out from the first unit. The channels are passing to the additional outlet slots passing in the transversal edge field at least of one of the primary external outlet slots. The invention ensures feeding of the extruded material in the required amount through the rather wide slots passing in parallel to each other.

EFFECT: the invention ensures feeding of the extruded material in the required amount through the rather wide slots passing in parallel to each other.

5 cl, 1 dwg

FIELD: production of thermoplastic pipes with double walls and connective couplings.

SUBSTANCE: the invention is dealt with a method and a device for production of thermoplastic pipes with double walls and connective couplings. The method of production provides, that the first pipe is extruded into a molding tunnel containing at least one row of folds directed along a trajectory. The first pipe is configured as a corrugated pipe at least on one of the first sections and the pipe is made wider up to the size of the connective coupling at least on one of the second sections. The second pipe is extruded into the first pipe and pressed into the cavities of the first pipe crimps. During the time period, when the first pipe is configured as a corrugated pipe and the second pipe is extruded into the first pipe, the space between the two pipes is subjected to the action of pressure p1, which exceeds the atmospheric pressure. Before the first pipe making wider up to the connective coupling the space between the two pipes is subjected practically to the constant pressure p2 < p1. In the process of extrusion of the second pipe into the first pipe, that has been already widened up to the size of the connective coupling, the second pipe is subjected to action of the pressure p3, exceeding the atmospheric pressure, then it is pressed to the first pipe. Then the pressure p1 is again fed into the space between the two pipes. The device for realization of the method is also presented. The invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

EFFECT: the invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.

16 cl,8 dwg

Up!