EP3278870A1 - Cuve de mélange pour un dispositif de mélange - Google Patents

Cuve de mélange pour un dispositif de mélange Download PDF

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Publication number
EP3278870A1
EP3278870A1 EP17184561.3A EP17184561A EP3278870A1 EP 3278870 A1 EP3278870 A1 EP 3278870A1 EP 17184561 A EP17184561 A EP 17184561A EP 3278870 A1 EP3278870 A1 EP 3278870A1
Authority
EP
European Patent Office
Prior art keywords
mixing
trough
tool
vertical axis
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17184561.3A
Other languages
German (de)
English (en)
Inventor
Guido Egler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TEKA Maschinenbau GmbH
Original Assignee
TEKA Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TEKA Maschinenbau GmbH filed Critical TEKA Maschinenbau GmbH
Publication of EP3278870A1 publication Critical patent/EP3278870A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/82—Pan-type mixers, i.e. mixers in which the stirring elements move along the bottom of a pan-shaped receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/323—Driving arrangements for vertical stirrer shafts
    • B01F35/3231—Driving several stirrer shafts, e.g. about the same axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • B01F35/53—Mixing receptacles characterised by the configuration of the interior, e.g. baffles for facilitating the mixing of components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B28C5/166—Pan-type mixers
    • B28C5/168—Pan-type mixers with stirrers having planetary motion

Definitions

  • the present invention relates to a mixing trough and a mixing device, in particular for a mixing device for mixing solids.
  • Mixers for mixing solids, in particular for producing hydraulically bound substances, such as concrete or mortar, are known in a number of different designs.
  • Homogeneity is an essential prerequisite for the production of specification-compliant products with constant product quality.
  • swirls are used, with which the mixing effect is to be strengthened. These are generally arranged so that they have an effect where the Mischgutströmung has calmed down by the effect of the actual mixing tool again so far that the Mischgutströmung runs substantially parallel, which does not have a good mixing at these points result.
  • mixing or whirling tools which have rectangular or square cross-sections.
  • Such tools have the disadvantage that they produce a flow shadow.
  • the material is possible for the material to be caked or glued from the mix. If such material at a later time dissolves again and falls back into the material to be mixed, this can lead to inhomogeneities in the composition of the final product and thus to specification not compliant products.
  • This problem is particularly serious if in the meantime a product change has taken place, ie in the mixer another product, for example, to be produced with a different color. Solvents from a previous product batch lead to color changes in the product that are not accepted by the customer. The human eye is very sensitive to even minor color changes.
  • EP 0945170 A1 is a mixer with a mixing rotor known, which is rotatable about a substantially vertical axis of rotation by means of a drive motor and whose mixing tools protrude into a mixing trough.
  • Two mixing tools can be controlled by means of a gearbox with a common motor. Both mixing tools have a speed difference predetermined via the transmission. This is disadvantageous because no separate adjustment of the rotational speed of the two mixing tools is possible.
  • WO 2009/071322 discloses a mixer, which also has two from above into the mixing trough mixing tools, wherein by means of two motors, the speed of the two mixing tools is freely adjustable.
  • the object of the present invention was therefore to overcome the disadvantages of the prior art, and in particular a mixing trough and to provide a mixing device that allows reliable mixing even with small quantities.
  • a mixing trough for a mixing device for mixing solids wherein the mixing trough is tapered towards the bottom end wherein the diameter of the mixing trough at its bottom end between 60% and 85%, in particular between 65% and 75% of Diameter of the mixing trough at its bottom end opposite opening end is ..
  • the mixing trough at the bottom end forms a smaller diameter or a smaller length and / or width than at its opposite opening end and / or the largest diameter or the largest length and / or width of the mixing trough.
  • the mixing trough is frusto-conical, wherein the top surface of the truncated cone is formed at the bottom end and the base surface at the opening end.
  • Heavily tapered mixing troughs which are funnel-shaped, also have several disadvantages compared to the mixing trough according to the invention.
  • a central, central outlet can be arranged in the ground.
  • due to the small floor space it is difficult to integrate important sensors into the ground, as there is little mixing material and there is not enough space.
  • the configuration of a mixing trough according to the invention thus makes it possible, on the one hand, for low mixing quantities to be reliably mixed, the total volume of the mixing trough being reduced almost constantly or only slightly.
  • several outlets and the desired sensors can be integrated into the floor.
  • the disposal takes place exclusively in the region of the bottom end, ie preferably up to a distance from the bottom end of 25%, in particular 15%, preferably 10% of the height, measured from the bottom end to the opening end of the mixing trough, the total volume of the mixing trough changes and thus the minimum capacity is only slightly or can be easily compensated for example by changing the geometry of the mixing trough.
  • the mixing trough as such is completely in the direction of its bottom end is formed tapering and in particular has a frusto-conical shape, at least in its interior.
  • the mixing tool may be particularly advantageous for the mixing tool to have at its outer horizontal, with respect to the vertical axis of rotation, ends a geometry corresponding to the tapered mixing trough.
  • Such a geometry can be realized according to an embodiment of the present invention by a vertical taper of the mixing tool according to the taper of the mixing trough.
  • the distance between the mixing tool and the inner wall of the mixing trough increases with increasing spacing from the bottom end of the mixing trough, since this widens with increasing height.
  • the invention also provides a mixing device for mixing solids with a mixing trough and with a first mixing tool rotatable about a substantially vertical first axis of rotation by means of a first motor, a second element rotatable about a substantially vertical second axis of rotation by means of a second motor Blending tool and an upper drive element comprising a rotatable by a third motor about a substantially vertical third axis of rotation connecting element, wherein the first mixing tool by means of a first shaft and the second mixing tool by means of a second shaft is directly or indirectly connected to the rotatable connecting element, so that the first and second mixing tools are inserted into the mixing device from above and the first mixing tool is rotatable about the first and the third vertical axis and the second mixing tool about the second and the third vertical axis.
  • a mixing device has an upper end and a bottom end opposite the upper end, the mixer bottom, on, and side ends.
  • the upper drive element is obviously arranged on or in the region of the upper end of the mixing device, so that the mixing tools are inserted from above into the mixing trough and project into this.
  • substantially "vertical” is to be understood as meaning that deviations of the angle of the vertical axes and of the mixer bottom from 90 ° (as obtained with an exact right-angled arrangement) are possible to a small extent (usually less than 10 °, preferably less than 5 °).
  • the vertical axes are exactly at right angles to the mixer bottom.
  • the inventive assignment of a respective motor to each rotatable element is made possible that the rotatable connection element, also referred to as a platform, is completely decoupled from the rotation of the mixing tools.
  • the individual mixing tools can each be controlled independently of each other.
  • This construction according to the invention of a mixing device makes it possible to adapt to different mixes without having to make any modifications to the mixing device itself.
  • the first and second motors are suitably connected in a force-transmitting manner, directly or indirectly, to the mixing tool, whereby the mixing tools are moved through the mix.
  • the structural design of the connection of the first and second shaft and the first and second motor can be done in a conventional manner and those skilled in the relevant possibilities are known here. A detailed description in this context is therefore dispensable at this point.
  • energy-saving modes can also be realized so that, for example, only one of the mixing tools is used with small filling quantities.
  • the rotational speed of the first, second and third motor is independently adjustable.
  • the rotational speed of the first and second mixing tools as well as of the rotatable element, ie the platform can be freely selected between fast turning and mixing up to a complete standstill for saving energy. This allows a large variability of the mobile mixing programs.
  • the first and the second mixing tool is identical, in particular in the form of identical mixing blade are formed.
  • first and the second mixing tools may be designed in the form of different mixing tools.
  • first vertical axis may be disposed at a first distance from the third vertical axis and the second vertical axis to be located at a second distance from the third vertical axis, the first and the second vertical axes second vertical axis in particular symmetrically opposite, preferably symmetrically arranged in different spacing, with respect to the third vertical axis.
  • the third vertical axis can form a central axis of rotation about which the first and the second axis of rotation again rotate. It has proven to be advantageous if the first and second axes of rotation are arranged symmetrically spaced at different distances from the third axis of rotation opposite. However, this is not mandatory. As it were applications are conceivable in which an asymmetrical arrangement of non-opposing first and second axes of rotation can provide advantages.
  • the first mixing tool is arranged at a third distance from the rotatable connection element and the second mixing tool is arranged at a fourth distance from the rotatable connection element, wherein the third distance and the fourth distance are different.
  • the difference of the third and fourth distance is greater than or equal to the height of the further spaced from the rotatable connecting element mixing tool.
  • the mixing tools must not be arranged in one plane. If these are arranged in one plane, it may be necessary in particular for mixing blades that they be operated in a synchronized manner, since they intermesh.
  • the mixing tools are arranged offset in height relative to one another, in particular offset at least in such a way that the difference from third to fourth spacing corresponds at least to the height of one of the mixing tools, then these can be controlled completely independently of one another.
  • the first, the second and / or the motor is arranged outside of the mixing trough, in particular on the upper side of the upper drive element.
  • the upper drive element gears and / or transmission elements comprises, by means of which in each case the operational coupling between the first motor and the first mixing tool, the second motor and the second mixing tool and the third motor and the rotatable connecting element takes place.
  • each of the three motors is preceded by a control or regulation unit by means of which the speed and / or direction of rotation of the motors can each be predetermined independently of one another.
  • the rotatable connecting element is formed at least substantially rotationally symmetrical with respect to the third vertical axis.
  • the rotatable connection element or the platform is preferably at least approximately circular or oval. Such a configuration has proved to be particularly advantageous.
  • the first and / or the second mixing tool is designed in the form of a mixing turbine, a mixing arm, a mixing blade and / or a mixing star.
  • first and / or the second mixing blade may have a bend at the outer section relative to the first or second vertical axis and convex or concave towards the outside rising is executed.
  • At least one mixing blade of the tool according to the invention has a bend on the outer section relative to the central shaft. This bend is round, preferably designed approximately circular. This configuration of the mixing blade ensures that the mix is collected from the center of the mixer and can be distributed with momentum in the region of the outermost, reachable by the inventive tool radius of the mixing device over the entire mixer surface.
  • a mixing tool according to the invention with mixing blades thus has a central shaft with a strut arranged essentially at right angles, on which the mixing blade or the mixing blades are arranged.
  • the corresponding adaptation to the bottom of the mixing device is achieved in part by replacement of the mixing blades or by elaborately sealed designs in which the height adjustment by moving parts, which are in the range of the mix.
  • the tool according to the invention is structurally much simpler and easier to maintain, in particular by means of the flange suspension described above, since it has neither moving parts in the mixed material nor fastening or adjusting devices are required that could come into contact with the mix and can be prone to contamination. Dirt leads to malfunctions, which in turn result in downtime, which is undesirable for economic reasons.
  • a strut is advantageously arranged substantially at right angles thereto, which is correspondingly horizontal and quasi parallel to the bottom of the mixing device with vertical installation of the shaft in the mixing device.
  • essentially at right angles is to be understood that deviations of the angle of the main axes of the shaft and strut of 90 ° (as it results in exact rectangular arrangement) in low Scope are possible (usually less than 10 °, preferably less than 5 °), as far as the geometric design of the mixer bottom allows.
  • the longitudinal axis of the strut is exactly at right angles to the longitudinal axis of the central shaft.
  • the desired good mixing usually requires an arrangement of at least one of the mixing blades immediately above the bottom of the mixer, which requires a parallelism of the strut to the mixer bottom when the strut has a mixing blade at both ends or forms a mixing blade.
  • This in turn requires a perpendicularity of the longitudinal axis of the strut to the longitudinal axis of the central shaft, if it is to be installed in the simple manner described above.
  • the first and / or the second mixing blade in the region which comes into contact with the mix has no fastening or adjusting devices.
  • each having a mixing blade at each end of the strut the bend is advantageously designed so that the bending direction of the two mixing blades is in the opposite direction relative to the main vertical plane of the strut.
  • the mixing blade is "outwardly” running outwards, ie, the vertical height of the mixing blade at the outer, remote from the shaft end is greater than at the shaft closest part of the strut on which the design of the mixing blade begins.
  • the slope can basically be designed arbitrarily, but it is preferred if this occurs without the formation of edges or similar transitions, as these in turn could negatively affect the mixing effect.
  • the pitch is concave or convex, more preferably approximately circular or circular.
  • the throwing and self-cleaning performance of the tool according to the invention is further improved.
  • first and / or the second mixing blade in the region of the first and / or second vertical axis at the underside facing the mixing bottom compared to the outer portion of the first and / or second relative to the first and second vertical axis second mixing blade has a greater distance from the mixer bottom than the mixing blade.
  • the strut is designed so that in an inner region between mixing blade and central shaft at the bottom, the bottom of the mixing device associated side of the strut creates a passage through which the mix can dwell during mixing in the center of the tool or but can flow slowly under the strut.
  • the self-cleaning performance of the tool according to the invention can be improved. This is achieved most easily by the fact that at least one inner region of the strut has a greater distance from the mixer bottom at its underside facing the mixing bottom compared to the region formed by the mixing blade (s) than the mixing blade (s). Constructively, this can be achieved simply by a corresponding design of the strut with a vertical recess, preferably this Return in turn bent without the formation of edges, preferably designed circular.
  • first shaft and the first mixing blade and / or the second shaft and the second mixing blade are designed in one piece.
  • the central shaft and the strut disposed thereon are particularly advantageously designed in one piece, i. are made from a one-piece blank by appropriate design (e.g., by machining or the like).
  • This construction eliminates fastening devices for fastening the strut to the central shaft, which could reach the flow area of the mixed material during operation and may accordingly be prone to contamination. In such places, the unwanted caking and deposits mentioned in the introduction are particularly easy to form. In principle, however, it is also possible to attach the strut with corresponding hidden and not subject to the influence of the mix fasteners on the shaft.
  • first mixing blades and / or two second mixing blades are arranged mirror-symmetrically to each other on the first and second vertical axis.
  • At least one of the shaft remove end of the strut at least one mixing blade is arranged or the strut itself forms such a mixing blade.
  • a mixing blade or is formed there At each end of the strut is a mixing blade or is formed there.
  • Arranged means in the context of the present invention preferably that the mixing blade is designed without located in the region of the mix fasteners. This can basically be achieved by attaching to the strut a mixing blade with appropriate geometric by gluing or welding is attached. In contrast to screwing or the like arise during bonding or welding no lying in the range of the mixed material attack points by fastening devices that tend to caking or sticking of the mix.
  • the mixing blades are integrally formed with the strut, i. Strut and mixing blade made from a workpiece.
  • the risk of detachment of the mixing blade during the mixing process, where significant mechanical loads occur on the mixing blade, is thereby avoided.
  • the welding process will adversely affect the microstructure of the material, which may adversely affect strength and abrasion resistance.
  • first mixing blade may be designed to be upwards and the second mixing blade to be downwardly conveying or vice versa, or for the first and the second mixing blade to be designed to convey downwards or upwards.
  • At least one inner region of the Strive at least one lateral surface which runs obliquely to the vertical plane of the strut.
  • a particularly preferred embodiment of the tool according to the invention is characterized in that at least one, preferably all inner regions of the strut, which are occupied as above, have two lateral surfaces extending at different obliquely to the vertical plane of the strut.
  • the slope of a lateral surface directed downward to the vertical plane of the strut, while the slope of the second lateral surface can be directed upward to the vertical plane of the strut.
  • the lateral surfaces oriented obliquely to the vertical plane form a pyramidal structure.
  • the first motor is not in operative connection with the second mixing tool and the rotatable connection element
  • the second motor is not in operative connection with the first mixing tool and the rotatable connection element
  • the third motor is not in operative connection with the first and the second Mixing tool stands.
  • the invention also provides a use of a mixing device according to the invention for mixing solids.
  • FIGS. 1 to 3 a first embodiment according to the invention of a mixing device 1 is shown.
  • FIG. 4 if the design of the mixing trough 3 'is varied, otherwise identical elements are designated by identical reference numerals.
  • the mixing device comprises a mixing trough 3 and a cover element 5, on which a first motor 7, a second motor 9 and a third motor 11 are arranged.
  • the third motor 11 is operatively connected to a rotatable connecting element 13, on which in turn a first shaft 15 with a first mixing tool 17 arranged on it and a second shaft 19 with a second mixing tool 21 are arranged.
  • the mixing tools 17, 21 are designed in the form of two mixing blades 27, which are arranged on struts 23 connected to the shafts 17, 19.
  • the mixing vanes 27 are constructed rising outwards, wherein the slope in round shape or circular is designed.
  • the center of the imaginary circle, as determined by the bend, is the vertical extension of the line through the point of the inner region where the mixing blade begins to bend.
  • the preferred embodiment of the mixer bottom facing the underside of the strut with a recess 25 can be seen.
  • the two mixing tools 17, 21 are arranged at a different distance from the bottom of the mixing trough, in such a way that the two mixing tools 17, 21 are arranged partially overlapping.
  • FIGS. 3 and 4 especially FIG. 4 in a smaller embodiment of the mixing trough 3 ', show the tapering of the invention in the bottom area.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP17184561.3A 2016-08-05 2017-08-02 Cuve de mélange pour un dispositif de mélange Withdrawn EP3278870A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016114557.2A DE102016114557A1 (de) 2016-08-05 2016-08-05 Mischtrog für eine Mischeinrichtung

Publications (1)

Publication Number Publication Date
EP3278870A1 true EP3278870A1 (fr) 2018-02-07

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EP17184561.3A Withdrawn EP3278870A1 (fr) 2016-08-05 2017-08-02 Cuve de mélange pour un dispositif de mélange

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EP (1) EP3278870A1 (fr)
DE (1) DE102016114557A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110900831A (zh) * 2019-12-02 2020-03-24 长安大学 一种立轴行星振动式混凝土搅拌机

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DE10137489A1 (de) * 2001-07-31 2003-02-13 Martin Theodor Melchior Mischvorrichtung zum Mischen von pulverförmigen Stoffen mit Wasser
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB761614A (en) * 1953-09-15 1956-11-14 Ernst Alfred Reiffen Improved mixing and kneading machine
US3109632A (en) * 1959-09-15 1963-11-05 Wilhelm Eirich And Gustav Eiri Mixers
US3456906A (en) * 1966-05-05 1969-07-22 Nat Eng Co Cooling and conditioning unit for granular material
SU700185A1 (ru) * 1976-06-07 1979-11-30 Московский Ордена Трудового Красного Знамени Институт Химического Машиностроения Универсальный смеситель
US4606648A (en) * 1984-07-31 1986-08-19 General Signal Corporation Clustered mixing system
DE69720625T2 (de) * 1996-08-21 2003-10-16 Hosokawa Micron B.V., Doetinchem Konische Mischvorrichtung mit mindestens eine Mischschnecke und einem schnellrotierenden horizontalen Rotor auf eine vertikale Antriebswelle
DE202006014313U1 (de) * 2006-03-03 2007-02-01 Collomix Rühr- und Mischgeräte GmbH Mischvorrichtung sowie Mischwerkzeug
WO2009069162A1 (fr) * 2007-11-29 2009-06-04 Cristiano Provetti Dispositif de production d'un mortier prévu pour la construction
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