EP0459270B1 - Process and apparatus for making in particular corrugated fibrous concrete products - Google Patents

Abstract

In order both to improve the quality of curable fibrous concrete products and to provide an apparatus which is better than the prior art, is less susceptible and requires less cleaning and servicing effort, the invention provides that, after carrying out the moulding operation, the correspondingly deformable, still not fully cured plates on a mould table are backed with formwork laid on them from above and then turned together with the formwork through 180 DEG . A sheet provided on the still curable plate, on the underside during transporting, then comes to lie on the top. The production process can be performed by means of a mould table designed as a turning table. <IMAGE>

Description

2. The invention relates to a method and a device for the production of, in particular, corrugated fiber-reinforced concrete elements.

A device known from GB-A-1,056,923 comprises a turning arrangement. A formwork is moved under the table by means of a trolley which can be moved under the form table, gripped by means of a gripping mechanism and then turned over after the carriage which has moved the formwork to the device has been moved out from under the form table.

After turning, the formwork, which is now lying upside down, is raised in order to move a movement platform with the deformable membrane laterally out of the forming table, namely to below a fixed and non-movable conveyor belt. After the still moist asbestos cement has been placed on the movable movement platform, this is moved back into the molding table. Now the undulating formwork above is lowered and from below accordingly Roll upwards to perform the wave-shaped deformation. Then a new turn by 180 ° around a horizontal axis is carried out and a carriage carrying the formwork with the moist asbestos cement is moved again below the molding table.

While the laterally movable movement platform is retracted and extended at the top, a formwork previously filled with damp asbestos can be transferred to the wagon and transported away, with an empty formwork being transferred again in a second step.

However, the entire arrangement is disadvantageous and requires considerable construction effort, in particular because of the required laterally movable movement platform. In addition, the efficiency and clock sequence of the correspondingly operating device can be described as not optimal.

On the basis of the prior art mentioned at the outset, the object of the present invention is to provide an improved method for producing, in particular, corrugated fiber concrete elements and an associated device.

The object is achieved according to the invention with respect to the method according to the features specified in claim 1 and with respect to the device according to the features specified in claim 2. Advantageous embodiments of the invention are specified in the subclaims.

The present invention does not make any insignificant significant progress over the prior art.

On the one hand, it is provided in the device according to the invention that it is provided with a shooting belt which can be moved over the molding table. This ensures according to the invention that no laterally movable movement platform as required in the prior art is necessary. Because the shooting belt can be moved over the molding table and place the still damp, uncured, deformable plate on the molding table itself.

However, this is only possible if, in deviation from the prior art, the molding table itself is not covered by a formwork, but is freely accessible.

According to the invention, it is therefore also provided that a first transfer device is provided for transferring the formwork required in each case, specifically with a feed device which is effective on the upper side of the molding table. In other words, unlike in the prior art, the mold plate is not fed to the bottom of the mold table and then turned through 180 °. It can thus be placed on the molding table on the shooting belt and then fed to the mold plate from above.

This also ensures that the formwork topped with the plate to be hardened can only be deposited on the underside of the molding table by means of a further transfer device. Since in this case the formwork does not have to be added, the cycle sequence can also be increased compared to the prior art (in the prior art, the formwork filled with the concrete mass to be hardened has to be removed on the underside and then an empty formwork be fed).

In the method according to the invention, the still uncured deformable plate is covered on at least one side with a film and fed to the top of the molding table for carrying out the shaping in such a way that the film rests on the molding table opposite the formwork.

After the formworks filled with the concrete mass to be hardened have been deposited with the appropriate film for hardening, this gives the advantage essential to the invention that the mass to be hardened is covered on its underside by the formwork and on its top side by the film. This sandwich structure creates a water vapor tight and, on the other hand, closed covering on all sides, as a result of which the curing process is significantly improved and a higher final strength of the product is achieved by optimal aftertreatment.

In a preferred embodiment of the invention, in contrast to the prior art, not only carriages that can be moved back and forth, but a continuously rotating conveyor belt are used.

Figur 1 :

eine schematische Seitendarstellung der erfindungsgemäßen Vorrichtung mit quer zur Zeichenebene verlaufendem und zu auf den Formtisch ausgerichtetem Schießband;

Figur 2 :

eine schematische Seitendarstellung des Schießbandes im Bereich der Übergabe auf einem doppelseitigen Formtisch;

Figur 3 :

eine schematische Stirnseitendarstellung einer Schalung.

The invention is explained in more detail below with reference to drawings. The individual shows:

Figure 1:

is a schematic side view of the device according to the invention with transverse to the plane of the drawing and aligned to the molding table shooting belt;

Figure 2:

a schematic side view of the shooting belt in the area of the transfer on a double-sided molding table;

Figure 3:

a schematic front view of a formwork.

FIG. 1 shows a schematic side view in the middle of a molding table 1, specifically a double corrugated table 1, which can be rotated step by step around its turning axis 3 by 180 ° with the appropriate drive.

Below the molding or turning table 1 there is a transport belt, also referred to below as a transverse sliding belt 5, over which a mold, i.e. a shaped sheet or a formwork 7 with - which will be discussed later - still to be hardened but already brought into the final shape plate 9 can be brought to a transfer and stacking device 10, which in the exemplary embodiment shown comprises a hydraulic gripper 11 and a hydraulic jack 13 exists.

Finally, a further lifting and feeding device 15 is provided, by means of which formwork 7 provided on a pallet 17 can be gripped with a suction device 19, raised and transported to the molding table 1.

Finally, it is indicated schematically in FIG. 1 that the transfer and stacking device 10, such as the lifting and feeding device 15, are connected to one another via a carrying device 21 and can be moved together via an actuating device 23.

FIG. 2 schematically shows an acceleration belt 25 and a subsequent shooting belt 27, which with its end 27 ′ leading in the transport direction can be slowly moved back and forth to the rear end of the forming table 1, the deflection rollers 29 being moved forward and back together . The mode of operation is discussed in more detail below.

In a production line that is not shown in further detail, for example, continuously moist, i.e. still uncured formable fiber concrete elements with only low green stability are produced, the width of which already corresponds to a preselected width and the length of which can be cut to a desired dimension by means of a separating device (not shown). The uncured plates 9 separated in this way are separated from one another via an acceleration belt and fed to the shooting belt shown in FIG. 2, by means of the revolving conveyor belt 27 ″ the plates 9 mentioned are individually transported further.

So that the still moist and uncured plates 9 do not adhere to the conveyor belt 27 '' of the shooting belt 27, but also to the preceding conveyor or acceleration belts, the still uncured plates 9 are underlaid with a film 31, which is always together on the entire production process corresponding bottom and transport side of the plates 9 remain adherent.

By using the film, the usual drainage of the plates is not necessary. There is therefore no alkaline process water polluting the environment.

In order to transfer the above-mentioned still uncured plate 9 with film 31 underlaid on the bottom and transport side, the shooting belt 27 shown in FIG. 2 is advanced with its front end to the end of the shaping table 1 and then slowly moved backwards so that, as in FIG is shown, from the rear end to the front end of the molding table 1 over a slight height offset, the still formable uncured plate 9 is placed on the completely flat molding table 1. In Figure 1, the shooting belt 27 is visible from its front end.

In the exemplary embodiment shown, the shaping table 1 is designed as a corrugated or so-called undulating table in order to finally produce corrugated fiber concrete panels, also referred to as corrugated panels for short.

Such an undulating or corrugated table consists - which is known and is not part of the invention - of a plurality of roller or arch bodies 33 aligned parallel to one another with a stretched and if necessary tensionable support covering 35. After a wet plate 9 has been put down, the aligned parallel to one another Roll and bow body 33 are moved towards each other, so that the associated to the corrugated and support table and there always remaining support fabric 35 between the roll and bow bodies 33 sags, due to the weight of the deformable plate 9. This makes the plate 9 brought into the final form. If necessary, the corrugated sheet can also be sucked in by means of negative pressure during the deformation.

Then the actuating device 23 and the lifting and feeding device 15 are actuated and moved via the carrying device 21 in such a way that formwork 7 is gripped, lifted and moved into one position by the empty stack 17 via the suction device 19 shown until the formwork 7 is located directly above the plate 9, which has been brought into its final shape but is still uncured, above the molding table 1. Then, by lowering the lifting and feeding device 15, the formwork 7 is placed on the upper rear side of the plate 9 stored and secured on the mold table 1 existing locking holder 37.

Then the molding table 1 is rotated about its turning axis 3 by 180 °. In the still locked position, the formwork 7 thus comes to rest at the bottom, within which the still moist, but brought into the final shape and preformed plate 9 in the embodiment shown lies in a wave form with the film 31 lying on top.

Thereafter, the locking holders 37 are opened in order to transfer the formwork 7 with the preformed uncured plate 9 therein and the film 31 lying on top to the transport device designed as a transverse sliding belt 5.

For this purpose, the transfer transport device designed as a transverse shifting belt 5 itself is also provided with a height adjustment device 5 ', which is lifted from the molding table at the time of the direct transfer and can be lowered again into the lowered position shown in FIG. 1 after the locking holder 37 has been released.

Then the plate with the formwork 7 is moved to below the transfer and stacking device 10.

So that the transfer and stacking device 10 shown in FIG. 1 can grip the formwork 7 covered with the plate, the entire actuating and carrying device 23, 21 must be moved back into the position shown in FIG. In this position, the lifting and feeding device 15 can again raise a new formwork 7, while at the same time on the transfer and stacking device 10 with the hydraulic gripper 11, the formwork 7 occupied by the preformed, still moist plate 9 is grasped, raised via the hydraulic jack 13 and after moving the entire actuating and carrying device 23, 21 again to a finished stack 39 and stacked one on top of the other.

At the same time as it is being deposited on the production stack 39, a new formwork 7 is again placed on a preformed plate 9 which is still moist on the forming table 1.

As shown in FIG. 1, a double molding table 1, specifically a double corrugated table 1, is used, which works in a double cycle. That is, while on the underside the formwork 7 that has already been turned over and covered with the preformed plate 9 is placed, a new, still moist, inserted plate 9 is placed on the upper side after the stretching process on the forming table and brought into the final shape, and then already one place additional formwork 7 on the preformed plate 9.

With the aid of FIG. 3, it is to be shown only schematically that the formwork 7 can project beyond the actual size of the deformed panels 9, for example in the lateral and longitudinal directions, and that spacers 42 are provided, for example, on the underside at the edges of the formwork 7 at suitable locations can be to stack a plurality of formwork 7 with the internally occupied and finally shaped panels 9 on top of each other, without the underside of an upper formwork 7 resting on the plate to be hardened, which is located in a lower-lying formwork 7.

Claims (6)

1. Method of manufacturing, in particular, corrugated fibre concrete elements, whereby an as yet unhardened deformable panel (9) is deposited onto a moulding table (1) preferably in the form of a corrugated table and brought into its final shape and deposited for hardening and/or setting in a mould (7) corresponding to the desired shaping and possibly stacked, to which end the unhardened panel (9), which has been deposited and then deformed on the moulding table (1), with a mould (7) placed from above thereon is turned after completion of the moulding process with the moulding table (1) and on completion of the turn is deposited downward, characterized in that the as yet unhardened deformable panel (9) has an underlying film (31) and is fed for shaping to the top surface of the moulding table (1) in such a way that the film rests on the moulding table (1).
2. Device in particular for effecting the method according to claim 1, having the following features:

   - having a moulding table (1),

   - onto the top of which an as yet unhardened deformable panel (9) may be deposited and brought into its final shape,

   - the moulding table (1) takes the form of a turntable which is rotatable through 180° about a turning axis (3),

   - having a first transfer device for transferring the as yet unhardened deformable panel (9) onto the top of the moulding table (1),

   - having a second transfer device for transferring the panel (9), which has been brought into its final shape and is situated in its mould (7), to a transport device,

   characterized by the following features:

   - a shooting belt (27), which may travel above and beyond the moulding table (1), is provided for transferring the as yet unhardened deformable panel (9) onto the top of the moulding table (1),

   - the first transfer device for transferring a mould (7) when required comprises a feed device, which is effective at the top of the moulding table (1) and by means of which the mould (7) supplied in each case by the transfer device is transferred at the top of the moulding table (1) onto said table and may be deposited onto the previously laid, as yet unhardened panel (9),

   - on the underside of the moulding table (1) there is provided as a transfer device only the second transfer device for transferring the panel (9), which has been brought into its final shape and is situated in its mould (7), for transporting away.
3. Device according to claim 2, characterized in that the device for transporting away comprises a continuously revolving conveyor belt (5).
4. Device according to claim 2 or 3, characterized in that the device for transporting away comprises a lifting device (5').
5. Device according to one of claims 2 to 4, characterized in that a transfer and stacking device (10) is provided for gripping, lifting, moving and lowering moulds (7) charged with the deformed, as yet unhardened panels (9).
6. Device according to claim 5, characterized in that the first transfer device, which comprises a lifting and feed device (15), as well as a third transfer device provided for transferring the mould charged with a panel from the transport device to a stacking location is movable by means of a common carrying device (21).

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