LU86800A1 - PLANT FOR THE PREPARATION OF HIGH-STRENGTH PLASTER - Google Patents

Abstract

An installation for the preparation of high-strength plaster from synthetic or natural calcium sulphate (gypsum), characterized in that it comprises at least one endless chain conveyor (13) fitted with tipping pallets (53) which is diverted on return pinions (5) to form at least one upper side (9, 15, 21) and one lower side (11, 17, 23), a feed hopper (27) containing the raw material arranged above the first upper side (9) and a heating device in which the hot gases are propelled into chambers (31 to 39) each of which is arranged between an upper side and a lower side.

Description

B S S trO GRAND-DUCHÉ Ht LUXEMBOURG BL-Î007M1

Patent N '»xt. ...

Mister Minister of ^ March 1987 XlX, Economy and Movennes Classes, ..., Service of Intellectual Property

T "re <ii! L'Vré _i ^ 0 LUXEMBOURG

‘T 1. '' Request for a Qâ Invention Patent, 7 -.............................. — ....... .------------------------------------------------. .....................................-............ ......................-................ — .......... ........................................... '11 I. Request

Sieur Luc JANSSENS, Berkenlaan 19, B-2610 Wilrijk-Antwerpen, (2i

BELGIUM, ................. 7IZ

represented by E.T.FREYLIKGER. & ..... E.MEYERS, ing. cons, en.propr, ...... ind., ..... (3i 46, rue du cimetière, Luxembourg, ..... mandataires___________________________________________________________________________________ deposition! nt) this March 4th nineteen hundred and eighty seven____________ _______ (4, at 3.00 p.m., at the Ministry of the Economy and the Middle Classes, in Luxembourg: 1. this request for obtaining a patent for an invention concerning: ......... .................................................. .................................................. -................................................. ..........-....................................... .................................; ....... — ........ ... — ......-...........-.......... (5 |

Installation for the preparation of high resistance plaster.

2. the description in French ......... language ..................... of the invention in three copies: 3. 2 plates of drawing, in three copies; 4. the receipt of taxes paid to the Luxembourg Registration Office on. February 27, 1987 5. the delegation of power, dated Wilri j k-Antwerpen on February 26, 1987: 6. the successor document (authorization); declares (s) assuming responsibility for this declaration, that the inventor (s) is (are): (b:

Luc JANSSERS, Berkenlaan, 19, B- ^ 2610 Wilriik-Antwerpen, -Belgium -------------------------- claims (nt) for the above patent application the priority of one (or more) application (s) of (7) ............ ................... .......................... L ....................... .................................................. .. filed in (8) ........................................ .... / .........................

on (9) ........ ................ ...................... .................................................. ........................... / ...................... .................................................. ........................ .... .......

under N ° (10) ..................... ...................... .................................................. .......... f ....................................... .................................................. . ...................

in the name of (11) ............................................ .................................................. ................................. j ................ .................................................. ....................... .......... .....

elect (elect) domicile for him / her and, if designated, for his / her representative, in Luxembourg _______________ ....

46, rue du cimetière, Luxembourg __________________________________ _____________________________________ _______________________ _ (Π) is requesting the grant of a patent for the subject described and represented in the abovementioned appendices.

with adjournment of this issue to .........- eighteen ________________________-__________________________________________________________________________ month. (131

The ctépaaott / agent: ~ I_______________________________________________________________________________________________ ________________ (14) ______ Π. Deposit Minutes

The aforementioned patent application has been filed with the Ministry of the Economy and the Middle Classes. Property Service Intefl | çtuÆl «^ tîs ^ embourg, dated: March 4, 1987

//% \, I

Je% £ · -;:? "\ Pr. The Minister of the Economy and the Middle Classes.

at ..... 15.00 hours! J · ’Y '/ A £! ; . d.

. \; - t · r.- 'The head of the intellectual property department.

\ Λ \ f jf 7 y A6S0Q7_F _ / / __ EXPLANATIONS RELATING TO THE DEPOSIT FORM. / 7 ^ ii "if applicable" Request for certificate of addition to the main patent, to main patent application No ........ f. Of ......... ... (2 <enter the last name. First name prev-svo :, address of the applicant, when the latter is an individual or company name, legal form, address of the head office, when the applicant is a legal person - i? > enter the name nrtnom, address of the aeronautical representative, industrial oroDnéië advice, provided with a social power. a patent application for:

Installation for the preparation of high resistance plaster.

Luc JANS S ENS Berkenlaan, 19 B-2610 Wilrijk-Antwerpen Belgium. ί

Ρ.JANS.Ol / LU

Installation for the preparation of high resistance plaster.

The present invention relates to an installation for the preparation of high-strength plaster from natural calcium sulfate (gypsum) or synthetic (sulfogypsum, phosphogypsum and other synthetic by-products).

It is currently known to prepare plasters of high resistance (designated by "a plasters", owing to the fact that they essentially consist of semihydrates or anhydrites of variety ") which, when cured, have much higher mechanical characteristics than those of common plasters (designated by "plasters ß" because essentially composed of the variety ß). Thus the compressive strength of plasters a can vary between 300 and 600 bars and their flexural strength between 80 and 160 bars, while, for ß plasters, these resistances vary respectively between 50 and 100 bars and between 10 and 20 bars .

Document FR-A-84 17 162 discloses an installation for producing plaster a, in which plates are mounted on a central axis and the material.

'I

2, that is to say calcium sulphate in powder form, is moved by a grid to fall from tray to tray through an opening made in each tray. As a result, the material subjected to the 5 conventional heat treatments required undergoes a movement; which improves the yield of the process and / or the quality of the product obtained. However, this installation has the drawback that it is difficult to carry out the heat treatments there at the desired temperatures. Furthermore, the installation is not entirely satisfactory with regard to the profitability of the process and the quality of the product obtained.

The object of the present invention is to provide a plant for manufacturing plaster of high strength, having a simple construction, compact, without the disadvantages of the known installation. Another object of the present invention is to provide units mobile for the manufacture of high resistance plaster. Another object of the present invention is to provide an installation which allows the manufacture of a plaster of high resistance such as plaster oL according to a continuous process, from natural gypsum or by-products or synthetic residues.

According to the present invention, the installation comprises an endless chain conveyor equipped with tiltable pallets which is deflected on idler gears so as to form at least one upper strand and a lower strand, a material supply hopper. starting arranged above the first upper strand and a heating device whose hot gases are propelled into chambers arranged between each time an upper strand and a lower strand.

The number of returns from the chain conveyor depends on the length of the linear path and the desired processing capacity. Advantageously,

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3 the installation according to the present invention comprises three stages of return, of the chain conveyor, that is to say six upper and lower strands. However, it can also include even more, depending on the requirements 5 set.

According to the present invention, the tiltable pallets are maintained in an essentially horizontal position along the path of an upper or lower strand of the chain conveyor and tilt at the end of the path in order to unload the material transported respectively on the pallets of the strand lower or upper next or through the unloading opening, at the exit of the installation. It follows that the material undergoes, during its treatment at least 15 inversion and mixing; which improves the homogeneity of the product obtained.

Advantageously, the chain conveyor moves in a closed chamber comprising an inlet opening for the chain conveyor and the starting material as well as an outlet opening. Said closed chamber is advantageously equipped with pressure relief valves which make it possible to regulate the pressure inside said chamber.

Preferably, in order to reduce the tension in the chain conveyor, at least part of the idler sprockets is fitted with a drive means such as an outer sprocket on which a drive torque acts, L ' installation according to the present invention is advantageously mounted in a box comprising a window which makes it possible to check the state of the pallets which are recycled, for example.

Compared to the above-mentioned state of the art, the advantage of the installation in accordance with the present invention consists in that there is no scraping of the material and that the material is better stirred and rendered

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4 more homogeneous by reversing the pallets.

Other details will appear more clearly on reading the description. Of a preferred embodiment given in support of the appended figures in which: - Figure 1 is a schematic side view of the installation in accordance to the present invention; - Figure 2 is a schematic view on a larger scale of a return sprocket of the 10-chain conveyor;

With reference to the figures, identical reference marks relate to identical or analogous elements.

In Figure 1, there is shown an installation 15 for the manufacture of plaster a (from gypsum or synthetic calcium sulfate, comprising in a box 1 an endless chain conveyor 3 equipped with tiltable pallets, which is deflected on return sprockets 5 so as to form three stages 7, 13, 19 20 each comprising an upper strand 9, 15, 2 and a lower strand 11, 17, 23 before being recycled at 25 ”The installation is equipped a feed hopper 27 and a discharge opening 29. The installation also includes a heating device (not shown) such as a gas burner whose hot fumes are propelled into chambers 31 to 39 advantageously disposed between an upper strand and a lower strand Advantageously, the fumes circulate from the bottom up, while the material is transported from the top to the bottom.

It is obvious that the installation shown in FIG. 1 is given by way of nonlimiting example and that an installation in accordance with the present invention can comprise, if necessary, more than three stages, for example 10 stages.

5 1 c

According to the present invention, the chain conveyor circulates in a continuous chamber 41 which can be equipped with valves 43 for adjusting the pressure.

Advantageously, the box 1 is provided with a window 45 which makes it possible to check the state of the chain conveyor and transportable pallets, in particular in the recycling path 25.

Figure 2 shows in more detail a return sprocket 5 and the arrangement of the chain conveyor. Said chain conveyor consists of two chains with parallel cheeks between which are housed tiltable pallets 53 on a tilting axis 55 secured to the two cheek chains 51. Along the course of an upper or lower strand, said pallets 53 are kept in an essentially horizontal position by means of guides formed by the lower walls 57, 59 of the continuous chamber 41. At the end of the journey, the pallets 53 are released and can tilt by unloading the material transported on the pallets of the 2nd strand located below them.

The starting material fed by the hopper thus undergoes, during its treatment, several reversals.

The tilting movement of the pallets 53 is advantageously guided by stops 61 and 63 which prevent said pallets from striking the chamber walls too suddenly and thereby cause premature wear of the installation.

Advantageously, the continuous chamber 41 is equipped with doctor blades 65 for equalizing the material, in particular downstream from a reversal, so that the material is distributed over the pallets and does not form substantially agglomerates.

According to a preferred embodiment, the return gears 5 are provided with a drive means

* _ I

6 (not shown) such as for example an additional pinion, mounted outside the chamber 41 on the same axis as that of the pinion 5, and on which a drive torque acts. It is obvious that the passage of said axis through the side walls of the continuous chamber 41 takes place in a sealed manner.

It is obvious that the present invention is not limited only to the above description but that the protection extends to the scope defined by the claims.

Claims (11)

1. Installation for the preparation of high-strength plaster from natural calcium sulphate 5 (gypsum) or synthetic, characterized in that it comprises an endless chain conveyor 13 equipped with tiltable pallets (53) which is deflected on idler gears (5) so as to form at least one upper strand (9, 15, 21) and a lower strand (11, 17, 23), a feed hopper (27) arranged above the first upper strand (9) and a heating device, the hot gases of which are propelled into chambers (31 to 39) disposed between each time an upper strand and a lower strand. 2. Installation according to claim 1, characterized in that it comprises three stages of return (7, 13, 19) of the chain conveyor (3). 3. Installation according to claim 1 or 2, characterized in that the tiltable pallets (5) 2o are maintained in essentially horizontal position along the path and an upper or lower strand of the chain conveyor (3) and tilt at the end of the path in order to unload the material transported respectively on the pallets of the next lower or upper strand or else through the unloading opening (29), at the outlet of the installation. 4. Installation according to any one of the preceding claims, characterized in that the chain conveyor (3) moves in a closed chamber (41) comprising an inlet opening for the chain conveyor and the starting material as well as 'an outlet opening (29). 5. Installation according to any one of the preceding claims, characterized in that the closed chamber (41) is equipped with pressure relief valves (43). »'» 8 6. Installation according to any one of the preceding claims, characterized in that at least part of the return pinions (5) is equipped with a drive means such as an external pinion on which 5 acts a pair of training. 7. Installation according to any one of the preceding claims, characterized in that it is mounted in a box (1) comprising a window (45) which makes it possible to check the state of the pallets which are recycled (25). 8. Installation according to any one of the preceding claims, characterized in that the chain conveyor (3) consists of two chains with parallel cheeks (51) between which are tiltable pallets (53) on a tilting axis ( 55) secured to the two cheek chains (51). 9. Installation according to any one of the preceding claims, characterized in that the pallets (53) are held in a horizontal position by guides formed by the lower walls (57, 59) of the chamber. 10. Installation according to any one of the preceding claims, characterized in that the tilting movement of the pallets (53) is guided by stops (61,63). 11. Installation according to any one of the preceding claims, characterized in that the chamber (41) is equipped with doctor blades (65) for equalizing the material.