DE2316340B2 - METHOD AND DEVICE FOR PRODUCING TUBULAR BODIES FROM A FELT GLASS MATERIAL CONTAINING A CURABLE BINDING AGENT - Google Patents

Description

before 1 or 2, characterized in that the glass felt material introduced into the molding device has a housing (60,61,62) hardening section with a namely a low density and a rather uneven input part (60) and a tensile strength of the input part ßige tensile strength; its surface is because of the closed output part (61), as well as uncured binder more or less a gas burner (109) in the input part (60) and very sticky, so that with a sliding movement on a withdrawal pump (P), o \ e with the output part (61) 35, for example, a mold surface which is connected during manufacture that the device used for the outer mold element (83) causes considerable friction from the input part (60) to the output part (61). The frictional forces acting on the felt, and the fact that the outer molded element (83) can lead to the tearing of the front area of the hardening section during processing, through-band-shaped or already deformed felt material openings (84) for the inwardly directed 40.

Flow of hot gases through the felt material and further in the rear area of the curing section Passages (84) for the flow of hot gases through the felt material and through the exterior Has shaped element to 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, hardened Fihmaterials 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).

The invention relates to a method for producing tubular bodies from a curable material In a method of the type mentioned above known from the prior art (DT-AS 10 27 122), the outer and the stationary inner form elements are in the form of a caterpillar chain as Conveyor belt lined up molded links and a fixed hollow mandrel, over which an extruded Fiber mass constantly pushed away by the moving outer form members and thereby the Fiber mass is deformed outside and inside. For the purpose of hardening the fiber material through The hot gas flow passing through lateral openings in the hollow mandrel penetrates the fiber mass radially only in one direction. The fact that the hot gas flows through only in one direction can result in a slight curing effect can be achieved. In the case of fiber materials with a thick cross-section, this is the fiber throughput speed have to choose very low so that sufficient curing can be achieved. at high fiber throughput speed, the curing is 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

(• 5 are. If the cross-section of the Felt material you are forced to make expensive and time-consuming remodeling work, in particular due to the flexible arrangement of the outer formula

Xi-nte and due to the large number of these "Fdrmelememe" lit stand; An adaptation of the production to various ¹ Those shapes and sizes of the molded pieces are therefore uneconomical! Finally, it is a disadvantage that the outer molded members stick together when the soft felt material is deformed Since there is always a gap between the individual form elements, into which the felt material can penetrate during deformation. A device for carrying out this process can therefore only operate at a low throughput speed of the felt material and requires frequent cleaning of the Form elements, so that a satisfactory operation of the device is achieved. ·

Accordingly, the object on which the invention is based is to create a method of the type mentioned at the outset, in which a very high curing effect is ensured with proper shaping of the felt material.

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 felt material drawn through the hardening section from outside is led inwards.

A device for performing the method according to the invention with a curing part for the Felt material provided treatment part with passage openings for the passage of the hot gases is provided by the felt material, is 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 curing section passage 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 Throughput speed of the felt material is very high to be chosen so that a plant operating according to the process according to the invention is very economical Furthermore, the method according to the invention is characterized in that the felt material comes from outside pulled through the hardening section and through stationary outer and inner mold elements is, so that the felt material is properly deformed, the form elements do not stick and tearing of the felt material cannot occur. So the transport does not take place through the molded parts themselves, but by one in the direction of passage behind the 6s Curing section arranged conveyor which pulls the felt material through the curing section. This is excluded from the start.

that 'a upsetting of the sticky felt material Entry into the form elements and consequently a clogging of the form section. 'Can occur. Thus, dia necessary warning and cleaning work reduced to a minimum

• The outer form element, which is simply constructed and is kept stationary, can be exchanged easily, quickly and economically, so that a device for carrying out the method according to the invention quickly and at low cost to the desired can be adapted to different cross-sectional shapes of insulating pipe pieces.

Advantageous developments of the "method" according to the invention and preferred embodiments of the Apparatus for carrying out this method are characterized in the subclaims.

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

F i g. 1 shows a longitudinal cross-section through the curing 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 expanded Arrangement,

3 shows a perspective view of further parts of the curing section according to FIG. 1 exploded, and

4 shows a cross section through the curing section along the line VIl-VU in FIG. 1.

The Aushärteabschnitl shown in FIGS. 1 to 4. is part of a system for the continuous production of cylindrical pipe sections with a longitudinal slot made of mineral wool felt material with a hardenable binding agent. In this plant, a supply roll of the impregnated with an uncured resin felt material is provided to which in the travel direction of the felt material initially followed by a cutting device in which the band-shaped, unwound from the supply roll felt material is cut into sheets of the desired width. This is followed by a device for compacting the felt material, a device for the optional supply of a reinforcing element, for example a thread, and an immersion bath in which the felt material can be soaked with a binding agent if it is not already supplied in soaked form from the supply roll.

The next part of the system in the direction of flow is a crimping device in which the binder undergoes a heat treatment to partially cure the Binder on the surface of the felt material is subjected. Then this occurs in the previous one Sections of prepared felt material only in the in the F i g. 4 shown curing section, in which it is reshaped and cured starting from its shape, which is rectangular in cross section, into a cylindrical cross-sectional shape. From the A cylindrical tube provided with a longitudinal slit emerges as a felt material wherein the binder has been fully cured.

To transport the felt material through the individual treatment sections and in particular through the Curing section is provided behind this a Transportein direction, which the felt material through the Curing section pulls through. Finally, the felt material is placed in the system behind the transport

direction still by means of 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 shown in Figs. 1 to 4, the curing section is shown with a housing 60, 61, 62 give away the one cylindrical input part 60th a cylindrical output part 61 and a cylindrical Has central part 62 which extends between the input part 60 and the output part 61 and connects these with each other.

The inlet portion 60 of the housing has a cylindrical wall 65 which is open on its left side (FIG. 1) and those at their opposite end with an annular wall 66 extending radially inward connected is. The output piece 61 of the housing has a cylindrical wall 67 at its left end (Fig. 1) is connected to 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 input part 60 of the housing is provided with a transverse partition wall 70, in which is formed a central circular opening. on which a circular Stül / .plaite 71 fits. The circular The support piaitc 71 is equipped with a peripheral flange 72 which is fastened to the by means of the bolts 73 Qucrtrennsvand 70 is attached.

Another circular Stülzplaitc 75 is on the right end (Fig. 1) of the middle part62 is provided and connected by bolts 76 on flange 77 to the annular wall 68 of the output part 61.

A rear end wall 79 is attached to a radially outwardly extending flange 81 by bolts 80 Exit end of exit rope 61 attached.

The bolts 73, 76 and 80 can advantageously be replaced by quick-release clamps, which allow a quick attachment of the support phitien 71 and 75 and the end wall 79 enable.

I ¹ IIII outer Formclemeni 83 extends coaxially with the input-output and middle sections 60,61 and 62 and by circular openings in the Stütz.pliitten 71, 75 and the end wall 79 therethrough. The outer shaped element 83 has the shape of a cylindrical tube which is perforated by a number of openings 84 which are arranged at an angle. which over the length and circumference of the urqn The S with ia

ere end wall 79 are 87 provided (Fig. \

nzplQÜc 75 and the hi _i ^ Pltfpnen, Hjiscn J and, ^),;, which. ^ to the, Av Form elements, 83 fit. Through this . ! <lemmr | rigeiZUsammer Rc! But \ g.ssl? H! ÜB,: fauf, der, Au

c | t, sb: d> B ^ e-, lm,

Rcjbung.sscmuuiaur oer Aunenrnchfe, des ;; Outer form ^ iements sjtzeh. and the Stutzpjitien 73 'and the front wall 79 on, the outer Fbrmelement 83 are attached. -, ..

Dos, l) nke end of the outer mold element 83 is unsecured, inserted into the 7t butt plate so that when loosening the bolts 76 and 80, the outer form element 83 and thus also the Stützplattc 7ί and the end wall 79 can easily be pulled out of the housing element 60r61 as a unit.

An inner molding member 82 is disposed at the entrance end of the outer molding member 83 and is in the shape of a tube bent so that an axially extending end 83 extends axially into the input portion 60 and into the inlet end of the outer molding member 83 , and a vertically extending pipe part 92 are formed. The outer surface of the axial end 85 is at a radial distance from

s arranged on the inner surface of the outer formula element 83, so that an annular gap 89 for the passage of the Filzmaierials between the axial end 85 of the inner Formclements 82 and the outer Formelemcnt 83 is provided. An electrical resistance heater 90

ίο is included for heating and curing the felt 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 ι s (not shown) extend.

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 formula element 82 in thermally conductive) arranged in contact with this; 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 formula element 83 and the axial end 85 of the inner molding 82 through the

• s 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 top of the input part 60 extend attached to the input part 60 of the housing so that the

w heating plate 93 and the inner formula 82 in their Positions are held.

For introducing the felt mesial into the curing section and in particular for the progressive reshaping of the band-shaped shape of the imported

is felt in an approximately circular cross-section when passing through the annular gap 89, a guide channel is provided, the cross-section of which is flat at the entrance and curved progressively increasing in the direction of its exit end. and which is connected to an input cone 96 which extends through the open input end of the input member 60 to the input end of the outer formula menu 83. A wheel 100 is arranged in the inlet cone 96 and is freely rotatable about an axis which runs transversely to the longitudinal direction of the inlet cone 96. This wheel 100 engages the upper curses of l'ilzmatcruils engaged when it passes through the Kingnngskomi <·% so dal ¹ supports the deformation of Qucrwhniiu "UcbFiLmutucuU is.

Extends at the "Ausgaji'gsende of the hardening section yourself, etjt Stobjen; 101 coaxial with the outer shape | cpcnv 83 partly in the exit end of the "Ijjheiements 82 into it, to the escape

- SWR

Stopper iO with II Shape

mt 8 hnen to Prevent gas from getting inside the hollow molded felt material. Of the

uji Shape

Uli arranged at a radial distance from the outer ι83 * to allow the passage of the J ivjfis6hen the stopper and the outer - _t -.—- letjt, isu. A support 1021 from 6ö Biech.dl & is attached to the rear end wall 79, brings the plug 101 into one position.

The input part 60 of the housing is connected to a Gas inlet 104 is provided and the outlet part 61 is provided with an integral discharge pipe 105. A pump is provided for the 65 Return of the hot base through a pipe provided, which by means of a broken line from the gas outlet pipe 103 to the gas inlet pipe 104 is indicated (Fig. 1),

In Figure 4 is a cross section along the line VIl-VII of Fig. 1 shown to the gas burner assembly to clarify what is necessary for the hardening of the felt material as it passes through the input part 60 is provided. The parts of the gas burner assembly are shown in FIG. 1 omitted to show the To simplify the curing section.

As shown in FIG. 4 can be seen. is the cylindrical wall 65 with three equiangularly spaced arranged openings 108 and three gas burner nozzles 109 protrude radially through the openings 108. Each gas burner nozzle 109 is through one seated on the outer surface of the cylindrical wall 65 Flange held in place and screwed to this.

The gas burner nozzles 109 are connected to the respective arms by flexible connecting pipes 112 a gas distributor 113 connected. A gas feed line 114, which is supplied by a source (not shown) from Combustible gas comes is via a stopcock 115 and a connecting pipe 116 with the gas compressor 113 to provide a gas supply from the gas source to the gas burner nozzles.

The outer mold member 83 is provided with three flame protection devices 118 for the flames of the gas burner nozzles 109; as a further safety measure a perforated explosion protection 119 extends in a distance around the outer molded element 83 around, the perforated explosion protection 119 having three openings for the three flames of the gas burner nozzles 109 and is supported by the transverse partition 70 by the supports 121.

The felt material impregnated with non-hardened binding agent is used in this plant withdrawn from the supply roll and fed to a cutting device, which the Filzmaierial in a band with the desired width. Thereupon the now ribbon-shaped Filzmaierial is between Verdichlungsswalzen passed through, giving away with a trapezoidal cross-section. This is a Caused increase in the tensile strength of the felt material before it reaches the hardening section. Optionally, an element, for example a thread, can now be added to the felt material Tape or any other woven material added and immersed in a Bindemil tel, if this has not already been done in the FiUnuuerial is present. This marketing element too serves to increase the tensile strength of the Fltamatc / Ials.

Next, the felt goes through the crimper, in which he is reeducated by a heat treatment. In doing so, the binder is close to the Surface of the felt material at least partially cured, so that the Klebrgkelt the surface of the Fungus material is eliminated and thus the frictional forces acting on the felt material are reduced. Even the tensile strength is increased by this heat treatment.

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 hardening section, so that when the felt enters the input end of the outer formula component 83 There is a substantially closed, circular cross-section.

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

At the same time, the abutting edges of the longitudinal gap of the film slide along and along the heating plate 93 then on their extension 94 so that they are heated. This bakeout undermines that Hardening of the binder, which is present in the Curling device found its beginning.

When the felt material passes through the entrance end of the outer form element 83, it will pass through the flames of the gas burner nozzles 109 are further heated.

When the thickness of the felt material is sufficiently small. the previous heating may be sufficient, in order to completely harden the binding agent through the entire thickness of the felt material. With very however, thick felt materials require further heating. To do this, 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 form element 83 and through the felt maierial, which now has the shape of a longitudinally slit having cylindrical tube. The plug 101 prevents the hot gases from inside the tubular fil / .matcrials leak into the atmosphere. The support 102 of the plug 101 is received within the longitudinal slot of the felt material. the Pump / 'calls in the exit part 61 of the housing Negative pressure so that the hot gases radially outward through the tubular IiIz and through the outer form element to the gas outlet pipe 105 flow. Via the gas inlet pipe 104, the hot gases back into the input part 60 of the housing /.

The flow of the hot gases radially inward through the openings 84 of the outer molded element causes the felt material to be lifted from the inside of the outer molded element 83; as a result, the frictional forces on the film are greatly reduced when moving 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 normelemeni is prevented. In addition, the suction effect ensures that the gases are not released into the environment, so that the system in the legs is very clean and environmentally friendly. The suction effect also to the fact that air from the environment leads m du wtrd retracted "housing and is sucked by the Fltematerial dom between plug 101 and the outer mold Clement 83rd This stream of fresh air cools the filling material and removes any remaining vapors. The binding agent condensate and the dust of the felt material accumulated in the starting part .61 can be easily removed .

The transport of the felt material through the hardening section is effected by tensile forces which are exerted by the Caused in Transportrlchtüng behind the Aushärieabschnilt arranged transport device will. This advantageously achieves that tensile forces at the Fllzmaiertal only wandered after the binding agent has hardened in the mushroom material and the felt material has reached its final strength. It proves to be particularly favorable that the tensile forces on the fil / .matcrlal its deformation in the Support hardening and deformation

709630/263

reduce the friction on the inner surface of the outer molding 83.

Behind the transport device, the tubular Felt material with a notch on the inside opposite the longitudinal slot. After that it will cut tubular felt material into pieces of the desired length in a suitable device.

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 can be converted from different inside and / or outside diameters. Also one Changing the cross-sectional shape of the felt material is easy to do because the inner and the outer form element 82 and 83 very easily by other form elements with the desired dimensions and the desired cross-sectional shape can be exchanged. For this it is only necessary that the Loosen bolts 73,76 and 79 so that the input cone% can be removed. The

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

For this purpose 4 sheets of drawings

Claims (3)

that by the curing section from outside Felt material drawn through is guided inwards. 2. The method according to claim 1, characterized in that that after the curing process air for cooling and evaporation through the felt material is pulled. Shape to be "applied" to the lines. can, ■ they are notched in the longitudinal direction on the wall opposite the longitudinal slot, so that the Slot can be spread wide enough during assembly. Besides circular-cylindrical in cross-section Isolating pipe pieces are also common isolation elements that have a different cross-section, so for example b blibi with a treatment part which is provided in the hardening part for the felt material and which has passage openings is provided for the passage of the hot gases through the felt material, according to one of the spray 3. Device for carrying out the method 25 se of rectangular or arbitrarily irregular Shape are. The processing of the glass felt material mixed with an uncured binder results in the Practice causes considerable difficulty. That in the