DE2316340C3 - Method and device for the production of tubular bodies from a glass felt material containing a hardenable binder - Google Patents

Description

The invention relates to a method for producing tubular bodies from a curable one Binder-containing glass felt material, in which the Felt material passes between outer and stationary inner Formeiementen and thereby in cross section is deformed. Heat from the inside to the outside of the:> deformed felt material in the form of hot gases in fed to a curing section and then the deformed, cured felt material in lengths is cut off, as well as a device for performing this method.

ίο Such a procedure is based on the state of the Technology, for example, for the production of insulating pipe pieces from a binder that can be hardened soaked band-shaped felt material is used. These pieces of insulating pipe are usually in the form of

is cylindrical with a longitudinal slot Fon parts used for the thermal insulation of conduit pipes. So that the insulating pipe pieces in preformed Shape can be applied to the lines, they are in the longitudinal direction of the longitudinal slot opposite wall notched so that the slot spreads wide enough during assembly can be. In addition to insulating tube pieces with a circular cylindrical cross section, insulating elements are also common have a different cross-section, that is to say, for example, of a right-angled or arbitrarily irregular cross-section Shape are.

The processing of the non-hardened binder mixed with GlasfÜzmaterials leads to the Practice causes considerable difficulty. The glass felt material introduced into the molding device has namely, a low density and a rather uneven tensile strength; its surface is because of not hardened binder more or less strongly sticky, so that with a sliding movement on for example, a mold surface of the device used in manufacture, there is considerable friction occurs. The frictional forces acting on the felt can cause the lead band-shaped or already deformed felt material.

In one known from the prior art Method of the type mentioned (DT-AS 10 27 122), the outer and the stationary inner Form elements in the form of a caterpillar chain as a conveyor belt strung together form links and a fixed hollow mandrel, over which an extruded fiber mass through the moving outer mandrel Molded links are constantly being pushed forward and thereby the fiber mass is deformed outside and inside. The for Purpose of curing the fiber material through lateral openings in the hollow mandrel The flow of hot gas penetrates the fiber mass radially in only one direction. By flowing through the hot gas A slight hardening effect can only be achieved in one direction. When thick in cross-section Fiber materials you will therefore have to choose the fiber throughput speed very low, so sufficient curing can be achieved. With the high fiber throughput speed, the curing

<) o tion not over the entire cross-section of the Felt material guaranteed. A further disadvantage of this method according to the prior art is that the outer shaped elements in the form of a caterpillar chain are complicated in structure and therefore prone to failure

^(l 5 are. In a variation of the cross section of the felt material is one forced to carry out expensive and time-consuming IJrnbauarbeiten, in particular, by the movable arrangement of the outer Formele-

ments and arise from the multitude of these form elements. An adaptation of the production to different Shapes and sizes of the fittings is therefore uneconomical. After all, it is a bad thing that the outer moldings can stick together when deforming the soft Filzmatenal-Musse, because between There is always a space left between the individual formulas, in which the felt material during deformation can penetrate. A device for carrying out this method can therefore only be used with less Working speed of the felt material and requires frequent cleaning of the mold elements, so that a satisfactory operation of the device is achieved.

Accordingly, the object on which the invention is based is to provide a method of the above-mentioned to create named genus, in which a very large curing effect with proper shaping of the felt material is guaranteed.

According to the invention, this object is achieved in that before passing through the hot Gas flow from the inside to the outside, the gas held stationary through passage openings in the outer Form element and through the hardening section Felt material drawn through from the outside is guided inwards.

A device / for the implementation of the according Procedure with one in the hardened! for the felt material intended treatment part, which with Passage openings are provided for the passage of the hot gases through the felt material, is thereby characterized in that the curing section has a housing having an input part and an output part closed off by the input part, as well as a Gas burner in the input part and a withdrawal pump, which is connected to the output part, that the outer mold element extends from the input part to the output part, and that the outer mold element in the front area of the hardening section there are diaphragm openings for the inwardly directed Flow of hot gases through the felt material and further passage openings in the rear area of the hardening section for the flow of hot gases through the felt material and through the outer mold element has to the outside.

By passing the hot gases through the deformed felt material twice in the The method according to the invention is compared to a method according to the prior art Curing speed doubled. As a result, the wall thickness can be relatively thick molded felt materials are cured properly. The strong curing effect also enables the To choose the passage speed of the felt material very high, so that one according to the invention Process working plant is very economical. The method according to the invention is also distinguished characterized in that the felt material from outside through the curing section and through stationary arranged outer and inner form elements is pulled through, so that the felt material flawlessly is deformed, the form elements do not stick and cracking of the Füzmaterials cannot occur. Of the Iiansport does not take place through the molded parts themselves, but by one in the direction of passage behind the Conveying device arranged in the hardening section, which pulls the felt material through the hardness section. This is excluded from the start.

that a upsetting of the sticky felt material during Entry into the mold elements and therefore clogging of the mold section can occur. So they are required maintenance and cleaning work is reduced to a minimum.

The outer form element, which is of simple construction and is kept stationary, can be light, quick and easy are exchanged, so this is a device for carrying out the method according to the invention quickly and at low cost to the desired different cross-sectional shapes of insulating pipe pieces can be customized.

Advantageous further developments of the invention The method and preferred configurations of the device for performing this method are shown in FIG de: i characterized subclaims.

The invention is described below using an exemplary embodiment with reference to the drawing explained in more detail. It shows

FIG. 1 shows a longitudinal cross section through the extension section of an exemplary embodiment of the device for carrying out the method according to the invention.

F i g. FIG. 2 shows a perspective illustration of parts of the curing section according to FIG. 1 in apart

2s drawn arrangement.

F i g. 3 is a perspective view of further parts of the storage section according to FIG. 1 in expanded Representation, and

4 shows a cross section through the curing section along the line VII-VII in Fi g. 1.

The curing section shown in FIGS is part of a system for the continuous production of mn longitudinal slits cylindrical pipe sections made of mineral wool felt material provided with a hardenable binder. In a supply roll of the felt material impregnated with an uncured resin is provided for this system, which is first followed by a cutting device in the direction of passage of the felt material, in which the tape-shaped felt material unwound from the supply roll in strips of the desired width is cut. This is followed by a device for compressing the felt material, a device for optional supply of a reinforcing element, for example a thread, and an immersion bath in the the felt material with a binding agent! Can be soaked, if it is not already soaked by the Supply roll is fed.

The next part of the system in the flow direction is a crimping device in which the binder is a Heat treatment to partially harden the binder on the surface of the felt material is subjected. After that, that occurs in the vgi budding Sections prepared felt material only in the Aushärteabschnitl shown in Fig. 4, in which starting from its shape, which is at right angles in cross-section, it changes into a cylindrical cross-sectional shape is reshaped and hardened. From the hardening section, a longitudinal slot emerges provided cylindrical raw material as a felt material. wherein the binder has been fully cured is.

To transport the felt material through the individual Bel.iindlungsabschnitts and especially through the

The curing section is behind this a transport device provided, which pulls the felt material through the hardening section. In conclusion, will the felt material in the system behind the transporter

direction with a suitable tool on the inner wall opposite the longitudinal slot /. with a provided longitudinal notch and then in a suitable cutting device into pieces of the desired Parted length. >

As in the I- i g. 1 to 4, the curing section is shown with a housing 60, 61, 62 provided, which has a cylindrical input part 60. a cylindrical output part 61 and a cylindrical Has middle part 62 which extends between the input part 60 and the output part 61 and connects these with each other.

The input part 60 of the housing has a cylindrical wall 65 which is open on its left side (FIG. 1) and the;>. p. her opposite end with an if radially inwardly extending annular wall 66 is connected. The output part 61 of the housing has a cylindrical wall 67 which at its left end (Fig. I) with a radially inwardly extending flat annular wall 68; the cylindrical central portion 62 of the housing extends / between the annular walls 66 and 68 and is connected to their inner peripheral edges.

The cylindrical wall 65 of the entrance part 60 of the housing is provided with a transverse partition wall 70, in> s which has a central circular opening formed on which a circular support plate 71 fits. The circular Support plate 71 is provided with a peripheral flange 72, which by means of bolts 73 on the Transverse partition 70 is attached.

Another circular support plate 75 is provided at the right end (Fig. 1) of the central portion 62 and connected to the annular wall 68 of the output part 61 by bolts 76 on the flange 77.

A rear end wall 79 is attached to a radially outwardly extending flange 81 by bolts 80 Output end of the output part 61 attached.

The bolts 73, 76 and 80 can advantageously be replaced by quick release clamps that quick attachment of the support plates 71 and 75 and the end wall 79 enable.

An outer form element 83 extends coaxially with the input-output and central parts 60,61 and 62 and through circular openings in the support plates 71, 75 and the end wall 79. The outer feature 83 has the shape of a cylindrical tube which is passed through a number of elongated openings 84 is perforated, which are distributed over the length and circumference of the outer molding element 83.

The support plate 75 and the rear end wall 79 are provided with longitudinally split sleeves 86, 87 (Fig. 1 and 3), which on the outer surface of the outer Form elements 83 fit. The sleeves 86 and 87 are pressed together by clamping rings so that they are in the Frictionally seated on the outer surface of the outer mold element, and the support plates 75 and the End wall 79 can be attached to the outer molded element 83.

The left end of the outer molded element 83 is inserted unsecured into the support plate 71, so that when loosening the bolts 76 and 80, the outer molded element 83 and thus also the support plate 75 and the end wall 79 can easily be pulled out of the housing parts 60,61 as a unit.

An inner mold member 82 is disposed at the entrance end of the outer mold member 83 and has the Shape of a tube which is bent so that an axially extending end 85 which extends axially into the Entrance portion 60 and extending into the inlet end of the outer mold member 83, and vertically extending pipe part 92 are formed. The outer surface of the axial end 85 is at a radial distance from the inner surface of the outer formula element83 arranged, so that an annular gap 89 for the passage of the felt material between the axial end 85 of the inner Formelmicnts 82 and the outer Formelemcnt 83 is provided. An electrical resistance heater 90 is included for heating and curing the fil / .material its passage through the annular gap 89 is provided within the axial end 85 and with connecting lines 91 equipped, which extends through the vertical pipe part 92 for connection to an electrical voltage source (not shown) extend.

F. a flat vertical heating plate 93 with an extension 94 of less height than that of the The main part of the heating plate 93 is at the top of the axial end 85 of the inner molding element 82 in thermally conductive Contact with this arranged; for stiffening, the vertical pipe part 92 is supported by a support 99 with the Heating plate 93 connected. The extension 94 extends between the outer mold member 83 and the axial end 85 of the inner molding 82 through the annular gap 89. A support block 97 is on top of the Heating plate 93 attached and secured with three bolts 98 or with quick release clips (not shown) extending through the upper part of the input part 60 extend attached to the Kingang part 60 of the housing, so that the Heating plate 93 and inner mold member 82 are held in their positions.

For introducing the felt material into the hardening section and in particular for ongoing deformation the band-shaped shape of the introduced felt material into an approximately circular cross-section when passing through the annular gap 89, a guide channel is provided, the cross section of which is at Entrance is flat and curved towards its exit end progressively increasing, and that with a Input cone% is connected, which extends through the open input end of the input part 60 to the The input end of the outer mold member 83 extends towards. In the input cone% there is a wheel 100 arranged, which is freely rotatable about an axis which runs transversely to the longitudinal direction of the input cone 96. This wheel 100 engages the top surface of the felt material as it passes through the Entrance cone% extends, so that the deformation of the cross-section of the felt material is supported.

At the exit end of the curing section, a plug 101 extends coaxially with the outer one Mold element 83 partially into the exit end of the outer mold element 82 to prevent the escape to prevent heated gas from inside the hollow cylindrically shaped felt material. Of the Plug 101 is arranged at a radial distance from the outer mold element 83 to the passage of the To allow felt material between the plug and the outer mold element. A support 102 from Sheet metal attached to the rear end wall 79 holds the plug 101 in place.

The inlet part 60 of the housing is provided with a gas inlet pipe 104 and the outlet part 61 with a gas outlet pipe 105. A pump P is for returning the hot gas through a pipeline provided by a broken line from the gas outlet pipe 105 to the gas inlet pipe 104 is indicated (Fig. 1).

In the F-ig.4 is a cross section along the line VII-VII of Fig. 1 to illustrate the gas burner arrangement which is used for curing the Rilzmaterials is provided when passing through the input part 60. The parts of the gas burner assembly are in FIG. 1 is omitted in order to simplify the illustration of the curing section.

As shown in FIG. 4 can be seen. is the cylindrical one Wall 65 is provided with three equally angularly spaced openings 108 and three Gas burner nozzles 109 protrude radially through the openings 108. Each gas burner nozzle 109 is through one on the Outer surface of the cylindrical wall 65 seated flange held in place and with this screwed.

The gas burner nozzles 109 are connected to the respective arms by flexible connecting pipes 112 a gas distributor 113 connected. A gas supply 114 supplied from an unillustrated source from Combustible gas comes through a shut-off valve 115 and a connecting pipe 116 with the gas distributor 113 to provide a gas supply from the gas source to the gas burner nozzles.

The outer form element 83 is provided with three flame protection / devices 118 for the flames of the gas burner nozzles 109 provided; A perforated explosion protection is a further safety measure 119 at a distance around the outer molded element 83, the perforated explosion protection 119 with three openings for the three flames of the gas burner nozzles 109 and from the transverse partition 70 through the supports 121 is supported.

In operation, the felt material impregnated with non-hardened binding agent is used in this system withdrawn from the supply roll and fed to a cutting device, which the felt material in a band with the desired width. The now band-shaped felt material is then placed between compaction rollers passthrough, and provided with a trapezoidal cross-section. This is a Increased tensile strength of the felt material, before it gets into the curing section. Optionally, the felt material can now be used Reinforcing element, for example a thread, tape or any other woven material added and provided with a binding agent in an immersion bath, if this has not already been done in the Felt material is present. This reinforcement element is also used to increase the tensile strength of the Felt material.

Next, the felt goes through the crimping device, in which it is subjected to a heat treatment will. The binder becomes at least partially in the vicinity of the surface of the felt material cured, so that the tackiness of the surface of the felt material is eliminated and thus that of the felt material attacking frictional forces are reduced. The tensile strength is also increased by this heat treatment elevated.

Now the band-shaped felt material is gradually changed through the guide channel from the band-shaped, im Trapezoidal cross-section reshaped into a cylindrical shape. This process of deformation becomes continued in the entrance cone 96 of the curing section, so that when the felt enters the The input end of the outer molded element 83 already has an essentially closed, circular cross section is present.

Before reaching the inlet end of the outer mold member 83, the felt material is through the Input cone% guided around the axial end 85 of the inner Formclemenls 82 and heated in the process.

At the same time, the abutting edges of the longitudinal gap of the felt material slide along and along the heating plate 93 then on their extension 94, st) that they be heated. This heating supports the hardening of the binder, which is already in the Curling device found its beginning.

When the felt material passes through the entrance end of the

outer mold element 83 passes through, it is through the flames of the gas burner nozzles 109 are further heated.

When the thickness of the felt material is sufficiently small. The heating that has taken place up to now can already be sufficient to completely cure the binding agent through the entire thickness of the felt material. However, an additional heater is required for very thick felt materials. For this purpose, the hot gases flow from the flames of the burner nozzles 109 along the central part; 62 of the housing and pass through the openings 84 in the outer mold element 83 and through the felt material, which now has the shape of a longitudinally slotted cylindrical tube. The plug 101 prevents the hot gases from inside de; tubular felt material into the atmosphere. The support 102 of the plug 101 is received within the longitudinal slot of the felt material. The pump P causes a negative pressure in the outlet part 61 of the housing, so that the hot gases radia outwards through the tubular felt and through there; Outer formula components flow to the gas outlet pipe 105. The hot gases are returned to the inlet part 60 of the housing via the gas inlet pipe 104.

The flow of hot gases radially inward through the openings 84 of the outer mold element causes the felt material to be lifted from the inside of the outer mold element 83; this greatly reduces the frictional forces on the felt material as it moves through the hardening section. The suction effect of the pump P has the effect that vapors are drawn off from the felt material through the outlet part 61, so that condensation of these vapors on the inner and outer formula elements is prevented. In addition, the suction effect ensures that the gases are not released into the environment, so that the system is very clean and environmentally friendly when in operation. The suction

so also leads to the fact that air from the environment in cia: Housing retracted and through the felt material between the plug 101 and the outer formula ment 83 is sucked in. This stream of fresh air cools the felt material and removes any remaining vapors The binder condensate accumulated in the output part 61 and the dust of the felt material can easily removed.

The transport of the felt material through the curing section is caused by tensile forces, which are from de:

in the transport direction behind the hardening section arranged transport device caused will. This advantageously ensures that tensile forces on the felt material only occur afterwards the binding agent hardened in the felt maierial and somi

6y the felt material has reached its final strength It proves to be particularly favorable that the tensile forces on the felt material transform it into deformation Support curing section and help deform

the friction on the inner surface of the outer fitting 83 decrease.

Behind the transport device, the tubular felt painting is on the inside opposite the Provide a longitudinal slot with a notch. The tubular felt material is then placed in a suitable device cut into pieces of the desired length.

The system described and in particular the curing section can be done with little expenditure of time and without difficulties for the production of insulating pipe pieces of different inner and / or

10

Outer diameter can be converted. Also a change in the cross-sectional shape of the felt material is easy to do because the inner and outer mold members 82 and 83 are very easily replaced by others Form elements with the desired dimensions and the desired cross-sectional shape exchanged can be. For this it is only necessary to loosen the bolts 73, 76 and 79, so that the input cone 96 can be removed. The

ίο parts as shown in the fig. 2 and 3 is shown slightly can be removed from the housing.

For this purpose 4 sheets of drawings

Claims (7)

Patent claims: 1. Process for the production of tubular bodies from a hardenable binder containing glass felt material, in which the felt material between outer and stationary inner Form elements passes and is deformed in cross section. Warmth from the inside out and fed to the deformed felt material in the form of hot gases in a curing section then the deformed, hardened felt material is cut into lengths, thereby characterized in that before passing through of the hot gas flow from the inside to the outside, the gas through passage openings (84) in the outer stationary shaped element (83) and by the curing section from outside Felt material drawn through is guided inwards. 2. The method according to claim 1, characterized in that after the curing process air for Cooling and evaporation is pulled through the felt material. 3. Device for performing the method with a treatment part provided in the curing part for the felt material, which is provided with passage openings for the passage of the hot gases through the felt material, according to one of claims I or 2, characterized in that the curing section has a housing (60, 61,62) with an input part (60) and an output part (61) closed off by the input part, as well as a gas burner (109) in the input part (60) and an extraction pump (P) which is connected to the output part (61) that the outer shaped element (83) extends from the inlet part (60) to the outlet part (61), and that the outer shaped element (83) in the front region of the curing section passage openings (84) for the inward flow of hot gases through the Felt material and in the rear area of the curing section further passage openings (84) for the flow of hot gases through the felt material and through the outer formula element also has the outside. 4. Apparatus according to claim 3, characterized in that a to the rear end wall (79) of the Output part (61) attached plug (101) is provided which, during operation, the inner opening of the deformed, cured felt material closes, so that a gas escape through the inner opening in Direction of passage of the felt material is prevented. 5. Apparatus according to claim 3 or 4, characterized in that the inner and the outer Form element (82,83) are tubular. 6. Apparatus according to claim 5, characterized in that the end (85) of the inner shaped element (82) runs concentrically in the outer shaped element (83). 7. Device according to one of claims 3 to 6, characterized in that the inner and the outer molded element (82, 83) are releasably attached to or in the housing (60,61,62).