DE1629770C2 - Device for producing a glass fiber reinforced plastic pipe or pipe-like molded body - Google Patents

Description

the rovings 11 arranged, which these a parallel guide are.

In the direction of movement of the rovings 11, behind the drinking trough 28, a collecting trough 16 is arranged, which is assigned a second comb 15 at the inlet of the rovings II, which has a smaller tooth spacing than the comb 17 at the outlet of the drinking trough 28. Behind this comb 15 are three pairs of embossing rollers 14, 13 and 12, each of which is assigned a scraper 23 or 22 or 21, and which can be mounted in the side walls 26 of the collecting pan 16. The embossing roller pair 12 is shown in section AB and also in detail at Z , from which it can be seen that the embossing roller pairs limit annular gaps between strips 30 and 31 or 32 and 33, between the latter the rovings 11 are guided and in a flat cross-section band shape be deformed before being wound onto the winding mandrel 10. The rotational speed of the pairs of embossing rollers 12, 13 and 14 and the setting of their embossing pressure as well as the angular position of the collecting pan 16 pivotable on a support plate 24 about a vertical axis 25 should be designed to be automatically controllable.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Device for producing a glass fiber reinforced plastic pipe or a pipe-like one Shaped body by helically winding the pipe wall at a helix angle at which one or more rovings running from a bobbin with a substantially round cross-section such rovings, impregnated with a casting resin, guided side by side in parallel on a drivable Mandrel can be wound, with a laterally guided carrier carriage along with the winding mandrel assigned drinking trough with guide rollers and combs with teeth for guiding the individual Rovings at the inlet and outlet and also with rollers to flatten the rovings and to squeeze out the resin from these in a collecting tray before they run onto the mandrel, characterized in that that the collecting pan (16) in the direction of movement of the roving strands (11) behind the drinking trough (28) around a vertical axis (25) of the same to the required angle of inclination Is arranged pivotably adjustable, and the collecting trough (16) in the inlet of the rovings Comb (15) with a smaller tooth spacing than that arranged at the outlet of the drinking trough (28) Comb (17) and the flat pressing rollers in the form of at least one with a scraper (21,22, 23) provided calibrated embossing roller pair (12, 13, 14) for transferring the roving or rovings into Band shape are assigned. 2. Apparatus according to claim 1, characterized in that a plurality of embossing rollers (12 to 14) in Feed direction are arranged one behind the other and the embossing pressure of the winding mandrel (10) directly upstream embossing roller pair (12) is higher than that of the other roller pairs (13,14). 40 Following on from the state of the art within the meaning of Australian patent specification 2 38 021, it is at the invention to a device within the meaning of the preamble of claim 1. In the known case, it is carried out by nip rollers (see. Fig. 4, item 44 of the Australian patent 2 38 021), which serve more to squeeze out excess resin from the rovings, a considerable flattening of the rovings with a round cross-section running off the bobbins, so that they are shaped more like a ribbon (cf. also British patent 7 95 924) running onto the winding mandrel, one opposite the winding with round cross-section rovings, void-free and therefore stronger, if not yet completely uniform result in solid pipe wall. In the known case, however, it is still disadvantageous that the strip cross-section, anyway inexact, when the rovings run up on the winding mandrel, it also tends to change significantly because the emergence process on the ridge a "turning" of the flattened, adjacent and so together rovings forming a wide band in the band plane, d. i.e. around the high edge of the tape, so that the individual rovings due to thrust offset against each other and to each other press the teeth of the comb and, rubbing against them, deform cross-section so that what is on When it arrives at the mandrel, there is no flat strip of the same cross-section, which can be seen in terms of strength is of detrimental influence. The task was therefore to produce pipes with optimally uniform increased strength properties to be able to produce, and this with simultaneous strip thickness reduction and adjustment the glass content, to values that were previously only available in the pressing process with roving fabrics on flat plates scored. This object is achieved with the characterizing measure of claim 1. Two measures combined with one another are provided for solving the task: It an exact flat ribbon cross-section is made from the rovings; furthermore, the rovings are Swiveling the collecting tray including the embossing rollers into the bevel angle - already in the winding direction pointing - that is, without bending, subjected to the deformation of the cross-section, so that during the following run-up process the roving cross-section achieved by the caliber rollers is actually retained. Only the total combination is protected in the case of claim 1. Another useful measure results from claim 2. In relation to the state of the art, reference is also made to the fact that in the manufacture of screw suturing tubes made of steel tape by winding it on a mandrel at a certain helix angle is already known, the entire, often very long feed device, consisting of coil including goil holder, Cutting and welding devices, forming rollers including drives can be pivoted about a vertical axis to be arranged, which passes through the pipe axis at right angles and emerges at the run-up point of the tape (see German Patent 12 22 456, German Auslegeschrift 10 45 347). Albeit the invention of this type of adjustment of the tapered branch of the tape or the rovings makes use of the helix angle, so only insofar as in the invention of the Most of the inlet branch including the drinking trough, guide rollers and combs is not pivoted, but only the front end of the inlet branch in the form of the collecting tray on which the embossing rollers are arranged are. In this way it is achieved that the embossing rollers with proper Nominal cross-section of the rovings formed directly into the band shape, d. H. by the shortest route under the Target helix angle on the winding mandrel without distortion be brought to emergence. In the drawing (F i g. 1 to 4) an embodiment of the device according to the invention is shown in side view, shown schematically in a partial plan view on an enlarged scale and in two details. Laterally next to a drivable winding mandrel 10 is a bobbin carriage, not shown in the drawing to take up the rovings. Individual rovings 11 run off and become from these rovings first guided over a guide roller 20 that is fixed to the carriage, before being placed in a drinking trough 28 fixed to the carriage at a distance run side by side, in which they are impregnated with a casting resin. The individual rovings Il are held in the drinking trough 28 by further guide rollers 19 and 18, which have guide grooves can be provided and, as indicated at 29, rotatably mounted in side walls of the drinking trough 28 are. In the outlet of the T-tank 28 is a comb 17 for