NO810332L - PROCEDURE AND DEVICE FOR AA REMOVE PROFITS FROM EASY CONCRETE ELEMENTS - Google Patents

Description

In the Veet production of a building element of light--- or gas-j concrete, a mass is cast containing at least a silicic acid-h1 old material, a hydraulic binder, a porosity ice-^

forming agent together with water in a mould, in which the dough initially swells and hardens into a semi-plastic self-supporting dough mold body. In order to separate each individual building element, guide cuts are applied in this molded body by means of cutting wires, after which the body is brought to harden by being subjected to a steam hardening operation under elevated pressure and elevated temperature. After completion of steam curing, the various building elements included in the molded body are cut from each other in a special machine, which gives each individual! element a combined twisting* and displacement movement'.

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<!>I Due to the dimensions of the elements to be produced, more or less thick surplus layers are obtained on the outermost elements of said molded body. If these surplus layers have a thickness greater than 55 mm, can . ; deb same is removed using the above sharing machine. i i If, however, the thickness falls below 55 mm, it is necessary to chisel away the excess layer. This work is! not only time-consuming and expensive, but also often leads to damage, as the layer can be solid. booklet for the weird

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moving building elements and thereby moving surface parts of these with it. If the surface of the elements is damaged, the elements must either be discarded or repaired.

The present invention aims to eliminate the manual chiseling away of the surplus layer and ensure smooth, undamaged surfaces on the underlying building element. According to the invention, this is achieved by a relative movement occurring between said building element and a processing ' nordning which includes two separate tools, namely eti<i>i

front.. tools with at least one egg or working-in edge that is located, slightly below the excess layer's upper-r! surface and a rear tool with at least one egg or working edge which is located slightly below said surface;

than the fcemer r.tool edge for thereby under said relative-

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movement remove two partial layers from the element, namely a first partial layer whose thickness is determined by the depth of the front tool edge below the layer surface and a second partial layer whose thickness is determined by the difference in depth between the front j in the tool edge and the rear tool edge. By choosing the thickness of the second sub-layer rather small, e.g. within j

the range 5 - 15 mm, and in any case below 25 mm, it is required! no great forces to break free the excess material from the element, whereupon the risk of pulling away parts of the j \ exposed surface of the element becomes minimal. IN

' The special features of the above-mentioned processing device as such will appear in more detail from subsequent patent claims. I 'i

i i With reference to the attached drawing, an i follows below

in detailed description of an example of the implementation of the Invention. In the drawing, fig. 1 a perspective view: showing a mold body of steam-hardened lightweight concrete underneath

; passage through the processing device according to the invention, fig. 2 is a section - of an enlarged part of the same body, and fig. 3 a side view of the one in fig. 1 showed ! the mold body and the processing device. ! il! , II i In the drawing in its entirety designated by 1, the shaped body I includes a plurality of building elements 2, which are separated from each other according to instructions given, horizontal sections 3 ! which is applied to the body before its steam hardening.

I These cuts have a delimiting effect, but do not prevent that the various elements are rather strongly attached to each other and must be cut apart mechanically! as pointed out at the outset. The uppermost element 2 in the body has an excess layer which 4 must be removed. To the I end, the shaped body is guided in the direction of the arrow 5 through a i j in its entirety with 6 named processing device according to the invention.

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1 O' said device includes a schematically shown 7 . ! in the transport or feeding path for the mold body 1. Across the path extends a rack 8 which has two separate, j i

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i cutting or planer-like tool, namely a front tool 9 with at least one edge or working edge 10; \ located at a certain height above the path 7, and a rear tool eye 11 with at least one egg or processing edge 12 located slightly lower, above the path than said front tool egg 10. In the embodiment shown, said first : In tools 9 composed of a plurality of different teeth or in bars 13, which are separated from each other and each one !

I have an egg 10. The rear tool 11, on the other hand, consists of a ! single elongated, continuous leaf. This blade is adjustably mounted on the stand, more specifically in that it is swing-baifc around a wire, whereby the swing is provided by toi ! piston cylinder mechanisms 15 which are preferably of hydraulic type. Thereby, the blade edge 12 can be precisely set in the same plane as the cut 3 between the element 2 and the excess

In section 4.

; As can be seen from fig. 3, both the blade 11 and the teeth 1 13 j are inclined in relation to the horizontal plane in which the layer 4 and the elements 2 are in this case located.. More precisely, the blade and the teeth are inclined approx. 45° in relation to the horizontal plane, but even greater angles can also be considered.

\ In fig. 2 denotes 16 the plane in which the first tool's ! 9 eggs 10 will attack the material in the excess layer 4.

j j17 denotes the layer 4 surface.i , i '

The described device works in the following way; When the mold body passes both tools 9, 11, the tow sub-layer detaches from the excess layer, namely a first sub-layer whose thickness t^ is determined by the front tool edges 10 in depth below the surface 17 of the layer 4 and a second sub-layer! whose thickness t2 is determined by the difference in depth or: jlevel between the front tool edges 10 and the rear work-,

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the cloth edge 12. The layer is removed by crossing and/or scraping off the material. To ensure an intact, smooth surface 18 on element 2, the thickness of the second sub-layer should be less than 25 mm, as previously mentioned. Try hari ; thus shown that if this layer thickness t2 exceeds the aforementioned measure, there is a risk that the material in j

l the element 2 itself comes with the second sub-layer due to the adhesiveness that exists in the boundary surface j i which is marked by the cut 3. ' j

i<1>i I \ After having passed the device 6 shown in the drawing can<I>'

. the element 2 freed from the surplus layer 4 is fed through into a scraping device (not shown) and then possibly into a suction device. The thus cleaned element can in ! occurring cases are also fed through a device for j application of a suitable hydrophobic agent, such as silanes or polysiloxanes on the surface 18. Although the drawing shows a molded body 1 comprising a ; amount of building elements 2, in practice "usually only one single element with the associated excess layer 4 is passed through the processing device 6, since the elements themselves have previously<1> been cut apart in the above-mentioned, implied manner. In order to thereby enable the processing of elements with varying: thickness, not only the rear tool 11, but also the front tool 9 can be adjusted in height, so that this 1 tool's attack line 16 is located at an appropriate level, above the cut 3. It should further be pointed out that the described device is applicable even if instruction section occurs on the element or not Even in the case where ; < a similar cut is missing, namely the rear tool - I if the level difference between the eggs 10 and 12 is far too great I to plane away the second partial layer to get a smooth surface 18. Instead of just two tools of the described the type, the device 6 may include three or even more ; tools located at different levels one after the other; along transport lane 7. Likewise, it should be pointed out that work- ! the cloths do not necessarily have to be horizontally oriented, but can have any arbitrary angle. Example-in v^s they can be vertically arranged. Even other modifications! tions of the invention are conceivable within the scope of subsequent patent claims.

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Claims (8)

1- ; Procedure for removal of excess layer; <I> from building elements of hardened lightweight concrete, characterized in that a relative movement is produced between the 'new' element (2) and a processing device (6) comprising separate tools (9, 11), namely a front tool (9) with at least one edge or working edge (10) which is located slightly below the surface (17) of the excess layer (4) and, i i; a ' rear tool (11) with at least one egg or bear-in biting edge (12) which is located deeper under said upper-! surface (17) than the front tool edge (10) so that under said relative movement to remove two sub-layers from the element, namely a first sub-layer whose thickness (t1 ) is determined by! the difference in depth between the front tool edge (10) and j ij the rear tool edge (12) . ! 2. <1>F rem process according to claim 1, characterized in that the element (2) before hardening in a manner known per se is given an indication section (3) which delimits i ; the excess layer (4) from the element itself, whereby the egg (12) of the rear tool (11) is located in the same plane as mentioned (3). I I 3.. Device for removing excess layer from; building elements of hardened lightweight concrete, characterized in that it comprises two separate tools (9, 11), namely a front tool (9) with at least one egg or ■ processing edge (10) intended to be located at a distance below that of the surplus layer (4) surface (17), and a rear yerk cloth (11) with at least one egg or working edge (12) intended to be located at a greater distance below! said surface than the front tool edge (10) for by producing a relative movement between the element (2) and ' said tool, i; jer ner ' two partial layers from the element, namely a first partial layer whose thickness (t^ ) is determined by the depth of the front tool edge (10) below the layer surface (17) and a second partial layer whose thickness (t2 ) is determined by the difference between the depths of the front and the rear tool edge. 1 in 4. Device according to claim 3, characterized v! e■ d that the depth difference (t„).. between the front tool's: - |I & in egg (10) and the rear tool egg (12) is less than 25 mm. i 5. j Device according to claim 3 or 4, characterized in that the front tool (9) comprises a; series of different, in a direction perpendicular to said relative '! i In bevelling separated teeth (13). in i ! j 6. : Device according to one of claims 3-5, characterized in that the rear tool (111;. b: e! consists of a single continuous blade. ; : ij 7th; Device according to claim 5 or 6, characterized in that the tool blade'" and/or the teeth (13, 11) are inclined at least 45° in relation, to the surplus layer's (4)_ or element's (21 plan. 8.1 Device according to one of claims 3 - 7, characterized in that at least the rear tool (11) is adjustably mounted on a stand (8), e.g. by means of piston-cylinder mechanisms (15) to enable setting - of the tool's egg (12) on the same plane as one in the element (2). before this hardening, applied instruction section (3). : i i ■