Device for the production of transversely ribbed pipes

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for the production of transverse rib tubes with mold jaw halves which can be moved along one guide rail against each other by means of an associated drive device. The two guide rails each have a common shaping path, in each case one return path and two deflection paths Which is formed with an arcuate guide edge for the mold jaw halves and is arranged linearly movably guided on a machine-proof basic element and is connected to a compensating device which can compensate for a tolerance play of the mold jaw halves circulating along the associated guide track.

Devices for the production of transverse rib tubes are known per se in a multiplicity of designs, which are usually referred to as corrugators.

In the known device according to the invention, the necessity of lengthening the two guide tracks accordingly in order to prevent blocking of the mold jaw halves along the guide paths is obtained as a result of the operating temperature-dependent longitudinal expansion of the mold jaws. This length adjustment of the two guide tracks has hitherto been effected, for example, in such a way that the deflecting members are manually adjusted. This adjustment requires a well-trained staff. During the adjustment, the device is not in operation, so that the productivity is reduced.

A device of the type mentioned at the beginning is, for example, shown in FIG <patcit id="pcit0001" dnum="DE3118932C2"><text>DE 31 18 932 C2</text></patcit> known. In this known device, the mold jaw halves are attached to chains, which are deflected around deflecting wheels which form the deflection members. The deflection wheels have a circular circumference, they can be adjusted in height and transversely to the feed direction, ie production direction, on a stationary machine frame. This adjustment is done manually.

A device of the type mentioned in the opening paragraph is also known from the <patcit id="pcit0002" dnum="US3280430A"><text>US 3,280,430</text></patcit> known. In this known device too, the adjustment of the deflection wheels is carried out manually.

The <patcit id="pcit0003" dnum="US4824354A"><text>U.S. 4,824,354</text></patcit> Discloses a hydraulic press having first and second forming jaws attached to belts. The shaping jaws are movable along two endless guide tracks by means of an associated drive device. The two guide tracks form a common forming path. The deflection sections of the two shaping sections each have a deflecting element, which is formed by a roller with a circular circumference. The deflection pulleys are mounted on a machine-fixed frame in a spring-mounted manner in order to tension the belts and to compensate for temperature- and / or speed-dependent tolerances.

From the <patcit id="pcit0004" dnum="DE19619429A1"><text>DE 196 19 429 Al</text></patcit> A device of the type mentioned in the introduction is also known. In this known device, the mold jaw halves which rotate along the respective guide track are connected to one another by means of connecting elements which are formed by tension springs. The deflecting elements are formed in the inlet region into the shaping section with a non-circular but with an approximately elliptical guide edge in order to avoid overlapping contact of the mold jaws at their edges.

The invention is based on the object of providing a device of the type mentioned at the outset, which is simple in design, in which a manual adjustment of the deflection members is avoided in adaptation to the respective operating conditions and which can be operated with a high productivity.

According to the invention, this object is achieved by the fact that the respective deflecting element is made of a low-wear plastic material and the tolerance play is dependent on the temperature and / or the speed of the mold jaws, that the respective deflecting element is provided with a cloth- The associated mold jaw halves, and the compensating device has an air spring which can be subjected to compressed air.

With the aid of the compensation device connected to the respective deflecting element, each operating temperature-dependent change in the length of the mold jaws is automatically compensated by automatically adjusting the associated guide path to match the said change in length. At the same time, the compensation devices also serve to automatically compensate, ie equalize, the speed, ie centrifugal force-induced influences of the mold jaws along the deflecting members. As a result of the design according to the invention of the device, ie by the combination of the deflection members determining the deflection paths with the compensating devices, the advantage is obtained that manual adjustments of the deflection members are not necessary for adjusting the centrifugal force influences of the mold jaws along the deflecting members, And that the productivity of the device is improved.

Due to the fact that the respective deflecting member is formed with a cloth-like guide edge for the associated mold jaw halves, an undesirable jog movement in the transition between the respective deflecting member and the rectilinear forming section or the rectilinear return section is prevented and in this way the productivity of the device is improved.

According to the invention, the compensation devices are formed by pneumatic springs which can be acted on by compressed air. Such a compensation device is described, for example, in the company profile of Festo "Fluid Muscle Type MAS ..." 0010NH.

It has proved to be expedient in the case of the device according to the invention if the respective deflecting element consists of a low-wear plastic material, which is preferably a plastic material with oil deposits.

An exemplary embodiment of the device according to the invention and / or essential details thereof are shown in the drawing and are described below.

Show it:<dl id="dl0001"><dt>FIG</dt><dd>In a view from above, shows a configuration of the device for the production of transverse rib tubes,</dd><dt>FIG</dt><dd>In a larger scale, a detail of the device according to FIG <figref idrefs="f0001">FIG</figref>, Ie, a deflection member in combination with an associated compensating device, as well as a number of mold jaw halves which abut one another, and</dd><dt>FIG</dt><dd>6 shows a perspective view of the deflection element according to FIG <figref idrefs="f0002">FIG</figref> In the viewing direction from obliquely downwards in combination with the compensating device shown in section and in combination with a mold half which is likewise shown in a section.</dd></dl>

<figref idrefs="f0001">FIG</figref> 10 shows a configuration of the device 10 for the production of transverse rib tubes. The device 10 has a basic device 12 with two endless guide tracks 14, along which mold jaw halves 16 are moved circumferentially against one another. In<figref idrefs="f0001">FIG</figref> Only two of these mold jaw halves 16 are shown. The two guide rails 14 have a common shaping path 18 and a return path 20 in each case. The common molding section 18 and the respectively associated return section 20 are each connected by two deflecting sections 22 and 24. The deflection sections 22 each have a deflection element 26 and the deflection sections 24 each have a deflection element 28.

The mold jaw halves 16 which adjoin one another along the respective guide track 14 are driven by means of a drive device 30. The drive device 30 has toothed wheels 32 which are provided with a toothing 34 (see FIG.<figref idrefs="f0003">FIG</figref>), Which is provided on the underside of the respective mold jaws.

The respective deflection element 26 or 28 is fastened to a displacement element 36, which is mounted on a linearly movably guided basic element 38 as shown in FIG <figref idrefs="f0003">FIG</figref> . The linear mobility of the displacement element 36 with respect to the machine-resistant base element 38 is shown in FIG<figref idrefs="f0003">FIG</figref> By the double arrow 40.

The displacement element 36 and consequently the respectively associated deflecting element 26 or 28 are connected to a compensation device 42. With the aid of the compensation device 42, a tolerance play of the mold jaw halves 16, which is dependent on the temperature and / or on the speed of the mold jaw halves, is automatically compensated for, so that it is not necessary to manually adjust the deflection members 26 or 28 manually To compensate for this.

The respective compensation device 42 is formed by an air spring 44. The air spring 44 has a first connection fitting 46 and a second connection fitting 48. The air spring 44 is connected to the displacement element 36 by means of the first connection fitting 46. The second connection fitting 48 is connected to a machine-fixed bracket 50. The second connection fitting 48 has a compressed air connection 52. The compressed air connection 52 can be connected to a compressed air source (not shown) in order to pressurize the air spring 44 with compressed air of a defined overpressure. This results in a corresponding contraction of the air spring 44 between its connecting fittings 46 and 48, ie, a defined adjustment and tensioning of the first connecting fitting 46 to the second fastening fitting 48 which is fixed to the machine.

The respective deflection member 26 or 28 preferably consists of a low-wear plastic material which has oil deposits in order to minimize the friction of the mold jaws 16 along the respective deflecting member 26 or 28.

The respective deflection member 26 or 28 is formed with a clothoid-like guide edge 54 in order to prevent a jogging movement of the mold jaw halves 16 in the transition region between the respective rectilinear return section 20, the respective deflecting member 26 or 28 and the common straight- The clothoid-like guide edge 54 is formed by a clothoid-like guide channel 56, which is formed in the respective deflecting element 26 or 28 on the underside. The respective mold jaw half 16 has two guide rollers 58, which are matched to the guide channel 56 of the respective deflecting member 26 or 28 without play.

How <figref idrefs="f0002">FIG</figref> A spring element 60, which forms part of the compensation device 42, is also provided between the basic base element 38 which is resistant to the machine and the displacement element 36 of the respective deflecting element 26 or 28.

Identical details are given in the <figref idrefs="f0001 f0002 f0003">Figures 1 to 3</figref> Each with the same reference numerals, so that it is unnecessary to describe in detail all details in connection with these figures.