An extrusion head and a device for shifting and fixing mandrel

 

(57) Abstract:

The invention relates to the manufacture of metal tubes, at least the internal surface of which is coated with polymer, in particular to the manufacture of metal pipes. Extrusion head contains a matrix, in the inner channel which is mounted a mandrel. The mandrel has an axial and streamlined support. The outer surface of the mandrel and the inner surface of the matrix form a ring forming the slit. The axial bearing is made with the possibility of radial displacement and fixation. The mandrel is configured to pivot around a streamlined support. The device displacement and fixing of the mandrel of the extrusion head includes a leash that is installed with the opportunity to interact with the shank of the mandrel. The leash is provided with elements offset and fixing and rigidly mounted on the annular element, installed coaxially to the axis of the shank. Elements of bias and fixation are located in radial directions with the ability to interact with the annular element and the housing of the extrusion head. The invention improves the accuracy of the lock mandrel. 2 S. and 1 C.p. f-crystals, 3 ill.

The invention relates to the manufacture of metal tubes, at least inside the main tubes are designed for hot and cold water supply, heating of buildings, transportation chemically active substances, etc.

Known extrusion heads (EG):

1. U.S. patent 4370186, 29 D 23/04 from 19.12.80,

2. EP 0353977 A2, 29 47/02 from 05.05.88,

3. EP 0024220 B1, B 29 F 3/10, B 05 D 7/22 from 11.07.80,

4. DE 4225011 A1, B 29 47/02 from 29.07.92,

5. RF patent 2140359, B 29 47/02 from 05.12.97,

for the manufacture of metal pipes by application of a polymeric coating on the inner surface of metal pipe containing matrix in the inner channel which is mounted a mandrel having an axial and a streamlined support, and the outer surface of the mandrel and the inner surface of the matrix form a ring forming the slit. EG for a patent [5] contains the device displacement and fixing of the mandrel, interacting with its shank.

The disadvantage EH patent [1-4] is the low stiffness of the mandrel, which leads to oscillations and education thickness variation of the coating on the inner surface of metal pipe. In addition, the shank of the mandrel, provided with axial support in the form of a cone, excludes the possibility to adjust its position relatively to the matrix, since it involves only hard, unequivocal installation.

In Aigues [5 is emoi), however, it is not without some drawbacks.

Adjustment to ensure uniform distribution of the polymer at the outlet of the annular forming slits (exception thickness variation of the coating) is due to the bending section of the mandrel between the two supports. To ensure sufficient flexibility mandrel streamlined support cannot be removed from the output of the ring forming cracks more than 1/4-1/3 of the working of the long mandrel, which limits the possibility of stabilization of the flow, relieve internal stresses and exceptions cold junctions between the individual jets of the melt flow of the polymer (stream dissected streamlined support), and the introduction of a throttling area in this case is ineffective and does not prevent the occurrence of longitudinal shrinkage of the strips on the inner surface of MPT.

Furthermore, the design of the adjusting device does not provide precise positioning of the mandrel because of the remoteness of regulatory elements (eccentric) from the axis of the shank of the mandrel is the kinematic lever, increasing the amount of displacement of the axis of the shank relative to the eccentric responsible for the horizontal offset of the axis, is proportional to the ratio of the shoulders of the leash is another).

Together the main features of the EEG by a patent [5] is the closest to the proposed technical solutions.

The purpose of the present invention is to improve the accuracy of fixation Dorn.

This goal is achieved by the following:

compared with AG for the manufacture of metal pipes by application of a polymeric coating on the inner surface of metal pipe containing matrix in the inner channel which is mounted a mandrel having an axial and a streamlined support, and the outer surface of the mandrel and the inner surface of the matrix form a ring forming the gap, the axial bearing is made with the possibility of radial displacement and fixation, and the mandrel - can rotate around a streamlined support, as a minimum, for streamlined support in the direction of extrusion on the mandrel is screw the thread allocator;

device displacement and fixing of the mandrel of the extrusion head for the manufacture of metal pipes by application of a polymeric coating on the inner surface of the pipe containing the leash installed with the opportunity to interact with the shank of the mandrel and provided with elements offset and fixing the leash tightly smarter the wife in radial directions relative to the axis with the opportunity to interact with the annular element and the housing of the extrusion head.

The technical result of the use of the claimed EH and devices is that through the rotation of the mandrel around a streamlined support eliminates the loading of the thin walls of the matrix in the zone of their contact, simplifies the process of doing adjustments that can be performed without stopping the process, increases the accuracy of the geometric dimensions of WFC, which leads to lower consumption of polymers (cost of production).

In Fig.1 shows a diagram of lines for the manufacture of MPT; Fig.2 is a longitudinal section EG internal coating MPT; Fig.3 is a left side view of Fig.2.

Line for production of MPT (Fig.1) consists of a forming device 1, the extrusion block 2, reported to the appropriate internal channels with the extrusion of polymer 3, 4 and glue extruder 5, the ultrasonic welding head 6, bath cooling, 7, 8 pinches the pipe pulling machine 9, the drum 10 for winding tubes in the Bay. The feedstock for production of MPT are aluminum tape 11 with a thickness of 0.2... 0.3 mm, the Bay which is installed on the forming device, the polymer - polymer composition on the basis of high density polyethylene and adhesive - adhesive polymer composition type "Sevilen". At the entrance to the extrusion B2 consists of a housing 14 (Fig.2), made in one piece with the mandrel 15 in the longitudinal plane of symmetry, on which is placed a roller 16 of the waveguide ultrasonic welding head 6. In the axial bore of the mandrel 15 is mounted matrix 17, in the inner channel which is mounted a mandrel 18 containing the axis 19 and streamlined support 20 and the shank 21. The shank his seat belt directly interacts with the lever 22, is rigidly mounted on the annular element 23 coaxial to the axis of the shank. The mandrel axial bearing 19 communicates with the housing 14 through a spherical washer 24, which is designed to ensure tightness. Springs 25 provide compensation for thermal movements of the shank and stability efforts clamp support 19 to the chassis. Floating bearing 20 centers the mandrel relative to the inner surface of the matrix. Its outer surfaces are elements of the sphere to allow reversal of the mandrel relative to this point. On the working surface of the mandrel is made helical grooves 26, 27, forming together with the inner surfaces of the matrix 17 screw thread allocator. The outer surface of the mandrel and the inner matrix form a ring forming the slit 28 and the channel for the extrusion of polymer, coordiantion cone filler 32.

The screws 33 are used to bias the annular element 23.

Line and described the EEG and devices work as follows. Aluminum tape 11 extends continuously pulling machine 9 through the forming device 1, AG 12, 13 and between divorced sponges mechanism 8 pinches the tube through a bath of cooling 7. In the forming device aluminum tape 11 is shaped in the form of a U-shaped profile, which after passing the location of the channels 29, 31 EG 12 through a Spinneret 32 takes the form of a ring closed profile with overlapping edges which are welded together by the roller 16 of the ultrasonic welding head 6. The channels 31, 30 on the inner surface of the thus obtained aluminum pipe from the extruder 5 is blown adhesive, and the channels 29, 28 of the extruder 3 - polymer. Through EH 13 corner of any type of known construction adhesive layers and polymer are applied to the outer surface of the aluminum pipe (not shown). To the inner polymer shell glued to the aluminum tube through the axial bore in the mandrel inside the tube is blown in the air. Before the air supply pipe, covered outside and inside the polymer, clamped by the jaws of the mechanism 8, kotonias, and it returns to its original state, and the internal cavity of the tube is sealed. Injected into the tube, the air is not only inflates the inner polymer coating, but also serves to control the quality of the weld edges of the pipe. After the final cooling and exit from the bath, cooling the thus obtained MPT wound on the drum 10. To separate the bays periodically activated mechanism 8, the pipe is clamped, and in place pinches after passage of this section through the pulling device is cut in such a way as to preserve the integrity of the internal cavity MPT.

Work EH 12 and the described device is as follows.

The polymer from the extruder 3 channel 29 is blown into the ring forming the slit 28. On the section of the mandrel between the two bearings 19, 20 polymer flows in the axial direction (between the walls of the matrix and the crests of the helical grooves) and tangential (along the spiral grooves). Selecting the appropriate clearance between the crests of the helical grooves and the walls of the matrix, the cross-sectional area of the spiral grooves and the angle of ascent (step), it is possible to achieve full alignment of the flow velocity of the polymer in the cross section of the ring f is mi. In real structures EG this ratio is maintained for MPT with an inner diameter of from 10 to 16 mm without much difficulty. On the section of the mandrel with screw grooves 27, the flow of polymer, cut a streamlined support 20 on a private jet (2 to 6), flows in axial and tangential directions. This leads to the fact that the zone of merging streams as would be smeared out in the tangential direction until the overlap of neighboring areas and lose pronounced boundaries. Satisfactory results (elimination of longitudinal stripes on MPT) is achieved when the length of the section of the mandrel with screw grooves 27 is not less than H/n (H - step helical grooves, n is the number of helical grooves). Helical grooves 27 are either cylindrical and conical surfaces of the mandrel, as shown in the diagram, or conical.

Due to the adjustment screws 33, the centering ring 23, which is rigidly connected a leash, is offset shank. When the displacement of the shank from the nominal position of the mandrel takes place at some angle relative to the support 20. When this change and the gaps between the outer surfaces of the mandrel and the inner surfaces of the matrix at the output of the EEG, which will lead to the redistribution of p is tolwinski coverage.

The device in the form of an annular forming a gap with the leash allows you to make adjustments during the process, and with high accuracy, since the direction and amount of displacement is directly proportional to the rotation angle of the adjusting screws.

1. Extrusion head for the manufacture of metal products by application of a polymeric coating on the inner surface of metal pipe containing matrix in the inner channel which is mounted a mandrel having an axial and a streamlined support, and the outer surface of the mandrel and the inner surface of the matrix form a ring forming a gap, characterized in that the axial bearing is made with the possibility of radial displacement and fixation, and the mandrel - can rotate around a streamlined support.

2. Extrusion head under item 1, characterized in that, at least for a streamlined support in the direction of extrusion on the mandrel is screw the thread allocator.

3. The device displacement and fixing of the mandrel of the extrusion head for the manufacture of metal pipes by application of a polymeric coating on the inner surface of the pipe containing the leash that is installed with the possibility of interaction with the XB is n on the annular element, installed coaxially to the axis of the shank, and elements of the displacement and fixation are located in radial directions relative to the axis with the opportunity to interact with the annular element and the housing of the extrusion head.

 

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