DE2037367A1 - Automatic sealing device for the spear chamber of a continuously working vulcanizing device - Google Patents

Description

Automatic sealing device for the splice chamber of a continuously operating VuI canister

The invention relates to an automatic sealing device for the splice chamber of a continuously operating one Vulcanizing device with an elongated vulcanizing chamber in 3? Form of a half-chain line through which the vulcanizable Material migrates through, the invention finds application in a device for the continuous vulcanization of elongated products.

Elongated vulcanizable products, such as cables coated with rubber or rubber-like materials, are conventionally vulcanized by feeding them from an extruder head into an elongated chamber filled with high pressure, high temperature steam. The product is drawn through the chamber and, after vulcanization has taken place, placed in a cooling chamber. The vulcanized and slightly cooled product is then made out

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taken from the cooling chamber and stored wound on a drum.

In order to be more easily accessible, the chambers are arranged horizontally in a large number of vulcanizing systems. There If rubber and rubber-like materials become sticky as a result of extrusion, the lower part of the cable is easily damaged, if it is on the lower inner surface of the access to the vulcanizing drum grinds

In the other® systems, the chambers are arranged vertically to avoid damaging the cable. Since the chambers must have a length of at least about 30 m, the vertical ones Chambers very difficult to maintain.

The more modern systems combine the advantages of the horizontal and vertical systems. With these Systems access is essentially in the form of a half chain line. The product to be vulcanized enters the upper end of the chain line and moves like a chain line downwards until it reaches a zone in which it is essentially tangential to the horizontal.

The continuously operating vulcanizing system, in particular for sheathing a core, for example a wire or cable, generally contains a processing area or a splice chamber, which is close to the exit of the extruder head and is located at the entrance end of the vulcanizing chamber. The core or the the product to be coated into the press head and the coated core is immediately inserted into the input end of the Vulcanizing chamber transferred. Such a system requires a device that has the input end of the Vulcanizing chamber open immediately behind the extruder head * net, so that the rear end of an already sheathed core

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length with the front end of a core still to be encased length can be spliced. In order to provide sufficient space for the execution of a splice, the opening of a substantial length of the vulcanization chamber required. This has been achieved by having one section of the introduction channel in another section was made slidable in a telescopic manner. Between the movable duct section or the splice chamber and the fixed channel section were provided with seals which cooperate with the fixed section and the extruder head .

The sealing of the Spieisskammer against the extruder head is due to the high steam pressure in the vulcanization chamber been a constant problem. It is difficult to achieve a good seal between the splitting chamber and the extruder head as many factors can lead to leaks. Some of these factors are different Manufacturing and processing tolerances, errors in assembly and installation, heat distortions in the splitting chamber or in the extruder head and expansion of the extruder barrel. This last factor is of the greatest importance. The material to be extruded from the extruder head comes from a Extruder barrel with an axis at right angles to the vulcanizing chamber. The material to be extruded is at one end of the vessel in the unmelted state and with the help of a screw conveyor the other or extrusion end fed. Heaters are distributed over the length of the vessel to keep the material on its way from to melt one end of the vessel to the other. The melted material gets into the sometimes cross head called extruder head, where it is pressed through a die and fed into the vulcanizing chamber. If a core is to be coated, it runs through the extruder head in a direction that overlaps with the vulcanizing chamber.

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and with the longitudinal axis of the extruder barrel a · forms right angle.

Due to the high temperature and the length of the extruder barrel, the barrel expands considerably instead · This expansion tries to push the extruder head in a direction perpendicular to the vulcanization chamber, which leads to a misalignment of the extruder head with regard to the splice chamber.

The Eehleinrichtung the splicing chamber with respect to the ex W truderkopfes can cause the seal surfaces that do not contact or that the sealing surfaces when they are in contact but are not parallel to each other, which leads to an escape of the steam.

Thus, the invention is based on the object of a continuously working vulcanizing device with a connection device between the extruder head and the splice chamber to create that avoids the disadvantages of the known devices.

This object is achieved according to the invention by an as ^ Splice chamber serving insertion channel, which forms the access to the 'vulcanization chamber and an annular material receptacle has passage with an annular inlet opening, an extruder head with an annular outlet passage and an annular outlet opening of the Outlet passage through which the vulcanizable material exits, and through a universal ball joint connector with an opening extending through it and outer spherical surface sections for engagement into the inlet and outlet passages for relative pivotal movement between the ball joint connector

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and the extruder head as well as between the ball joint connector and to allow the Spieisskammer and also the passage of the vulcanizable material through the To allow opening of the ball joint connector from the extruder head into the Spieisskammer.

The invention therefore proposes a novel arrangement of splitting chamber and extruder head, the Spieisskammer is connected to the extruder head with the help of a universal connector.

The entrance to the Spieisskammer and the exit from the extruder head each have an annular shape inside tapering wall to accommodate the respective spherical sections of the connection. The entrance and Exit walls of the splitting chamber and the extruder head each have an annular hat for receiving one Sealing ring. Each sealing ring is arranged further away from its respective passage opening than that Point at which the spherical sections of the connection touch the wall of the passage. The sealing ring is however large enough to touch the spherical surface of the connector and a seal between the spherical Produce surface and the wall of the passage.

The connector has an internal opening or opening Passage ^ through which the extruded material comes out of the extruder head can flow into the Spieisskammer.

The invention allows the extruder head to be maladjusted inside the Spieisskammer without the seal between the connected parts suffers.

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. Another advantage of the invention is that the Splice chamber and the extruder head can be arranged at different angles along the chain line of the cable can. The cross head can be placed at the optimal angle with respect to the cable chain line, whereby the grinding part decreases and the concentricity between the cable and its insulation from extruded Material is improved.

The splice chamber can also be arranged at an optimal angle in order to achieve a maximum distance between the insulated cable and the inner wall of the splice chamber. This will make processing a allows more extensive cable than before.

The inner tapering walls of the passages of the splice chamber and of the extruder head are preferred executed straight, so that the spherical surfaces of the connection have a linear contact with have the walls.

An advantage of the linear contact between the respective spherical surfaces of the connecting piece and the tapered surfaces of the splice chamber and extruder head passages is that larger manufacturing and processing errors can be tolerated than with curved walls around the curvature to make the spherical contact portions of the connection suitable.

Another advantage resulting from the linear contact is that of the lower heat transfer from the Splice chamber on the extruder die »As the steam temperature is well above the die temperature in the splice chamber, there is considerable heat conduction from the

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Spieisskammer on the die is very undesirable. if the If the die becomes too hot, vulcanization can take place in the extruder head. Since the seal sets itself up automatically, it can be better adapted to the cable size and the die holder can be made even smaller, resulting in a further reducing the heat transfer from the splice chamber leads to the die.

Further details of the invention are described in more detail below with reference to an embodiment shown in the drawing.
Show it:

1 shows a schematic view of the feed section of a continuously operating vulcanizing device, to which the invention is applied,

FIG. 2 is a view in the direction of arrow 2 in FIG enlarged side view showing the chain line shape of the vulcanizing chamber,

5 shows a longitudinal section on an enlarged scale the line 3-3 in S "ig · 1 and

4- a section similar to FIG. 3, but with the splitting chamber separated from the extruder head.

As particularly shown in Figures 1 and 2, a continuous vulcanizing apparatus is shown and is general denoted by the reference symbol ΊΟ. The cable core 12 to be sheathed with vulcanizable insulation material is supplied from the right in the direction of the arrow in Fig. 1 from a supply, not shown. The soul passes through

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an extruder or cross head 14 _f in which the core is provided with a jacket made of vulcanizable material. The material is fed to the head 14 from an elongated extruder barrel 16. The material is fed to a container 18 in the cold or dry state in the form of pellets or as a powder, and then with the aid of a mixer screw or the like contained in the vessel. promoted down into the head 14. On its way from the container 18 into the head 14, it is converted into the molten state by heaters 20. The molten vulcanizable material is pressed through a die arranged inside the head 14 and is thereby applied as a uniform coating to the core 12, while this is the. Head passes through. The sheathed core passes from the head through a connecting piece 22 into a splitting chamber 24, in which the vulcanization of the sheathing of the core begins. The splitting chamber 24 forms the feed section of the vulcanizing chamber, which is filled with steam of high pressure and high temperature. The material to be vulcanized is drawn through the splice chamber into a first channel section 26 connected to the splice chamber. The material then migrates through subsequent channel sections which are arranged quite generally along a catenary path, which is generally designated in FIG. 2 by the reference number 25. The material then enters a cooling chamber, which can be formed by extending the vulcanizing chamber. The vulcanized and slightly cooled product is then pulled out and stored. Since the entire vulcanization process is not part of the present invention, reference is made to US Pat. No. 5,108,521, which gives a detailed description of the entire system. Details of an extruder head can be found in U.S. Patent 2,794,213.

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Like Pig. 3 shows, "the splice chamber 24 has one with Threaded section 28 for receiving a tubular Sleeve 30, which forms an entrance opening of the splice chamber. The cuff 30 has a frustoconical entrance passage 32, which is of a inwardly tapering annular wall 34- formed will. In the wall 34 is an annular! Tut 36 formed, which receives a sealing ring 38.

A die holder anchor 40 forms the exit section of the head 14 and has an exit opening 42. The holder anchorage 40 has a truncated cone '

gene outlet passage 44. The wall 46, the passage 44 forms, tapers inward. In the wall 46 there is an annular groove 48 for receiving it a sealing ring 50.

The connecting piece 22 has a first spherical outer surface section 52 and a second outer spherical surface section 54. The section 52 sits within the passage 32 and touches the wall 34 on an annular line denoted by 56, which is closer to the outer opening of the cuff 30 than The sealing ring 38 _f The sealing ring λ 38 is, however, easily gripped by the surface 52 in order to produce a seal between the connecting piece 22 and the sleeve 30. A retaining collar 58 is attached to the sleeve 30 with one or more screws 60. The retaining collar 58 has an inwardly tapering bore 62, the walls of which taper in a direction opposite to the wall 34 when the retaining collar is installed.

During assembly, the connecting piece 22 is introduced into the passage 32 and the retaining collar 58 is attached to the Cuff 30 attached. When the retaining collar 58 on his

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Qrt is, it forms a new opening 64 of the Spieisskammer, the diameter of which is smaller than the largest diameter of the spherical section 52. The connector 22 is thereby held in place prior to its connection to extruder head 14.

The connector 22 is inserted into the passage 44 in the head. The spherical section 54 has a diameter such that it is connected to the wall 44 on an annular line which lies between the opening 42 and the sealing ring 50. This annular line is designated W at 66 and is close enough to the sealing ring 50 to sufficiently grip the ring and form a seal between the retainer anchor 40 and the connector 22.

The connecting piece 22 has an opening 68, which it the Sheathed or insulated cable core 70 allows to get out of the extruder head 14 into the splitting chamber 24.

When the continuously working vulcanizing device is operating properly, the steam pressure pushes In the vulcanizing chamber-H mer the splice chamber 24 to the right ^ top in Fig. 3 · The Splice chamber in turn presses against the connecting piece 22 and presses it to the right against the surface 46 of the. Holder anchoring 40. The steam is prevented from escaping through the sealing rings 38 and 50 as each of the acting from the passages 32 and 44 on the seals Steam pressure causes the seals between connector 22 and surfaces 34 and 46 to strengthen will. As the vapor pressure increases, so does the pressure in the lines of contact 56 and 66, causing the Lines of contact an increased pressure is exerted on the seals. An increase in the vapor pressure therefore leads

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to an increase in the sealing capacity.

From the above description and illustration " in FIG. 3 it is clear that the connecting piece 22 A seal between the head and the splice chamber over a wide range of malfunctions the head 14 and the splice chamber 24 maintains. Even if the connecting piece 22 changes its position with regard to the extruder head and the splice chamber, so the lines of contact 56 and 66 still remain because of the spherical shape of the surface sections 52 and 54 the same.

If for any reason it becomes necessary to detach the splice chamber 24 from the extruder head, so will the splice chamber is pushed telescopically into the first channel section 26, so that the operator perform a repair or splice a cable. __As Fig. 4 shows, the connecting piece 22 with respect to the splice chamber at a larger angle than shown in Fig. 3, so that it is not with the sheathed soul 70 collides.

Claims;

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Claims (6)

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Claims (1.j Automatic sealing device for the splice chamber ^ a continuously operating vulcanizing device with an elongated vulcanizing chamber in the form of a Half-chain line through which the vulcanizable material migrates, identified by a splice comb mer (24) serving introduction channel, which forms the access to the vulcanization chamber and an annular material receiving passage (32) with an annular inlet opening, an extruder head (14) with an annular, shaped outlet passage (44) and an annular Exit opening (42) of the outlet passage through which the vulcanizable material exits, and through a Universal ball joint connector (22) with an opening (68) extending therethrough and outer spherical surface portions (52, 54) for engagement into the inlet and outlet passages (32, 44) for relative pivotal movement between the ball joint and the extruder head as well as between the ball joint connector and the splice chamber and also allowing the vulcanizable material to pass through the opening (68) of the ball joint connector from the extruder head into the splice chamber. 2. Device according to claim.1, characterized in that the walls (34, 46) forming the inlet and outlet passages from the respective passage openings taper off inwards. 3. Device according to claim 2, characterized by a cuff (30) with which a pressure in the splice chamber 009886/1638 a direction is exerted so that the spherical surface sections brought into engagement with the tapered surfaces of the inlet and outlet passages will. 4 ·. Device according to claim 3 »characterized by a Retaining collar (58) »of the universal ball joint connector in the absence of that pressure when assembling the vulcanizer in engagement with the tapered one Surface of the inlet passage holds. 5. Device according to claim 2, characterized in that the outlet and inlet passages each have an annular shape Groove (4-8, 36), each of the grooves continuing away from the opening of the associated passage is as the point at which the respective spherical sections of the universal connector meet the walls touch the outlet and inlet passages, and that sealing rings (38, 50) are arranged in the grooves « 6. Device according to claim 2, characterized in that the outlet and inlet passages are frustoconical Have shape. MP / Ur - 22 389 009886/1638