EP1727939B1 - Verfahren und Turm für die satzweise Beschickung von Zuschlagstoffen in einer Anlage zur Herstellung von Asphalt und entsprechende Anlage - Google Patents

Verfahren und Turm für die satzweise Beschickung von Zuschlagstoffen in einer Anlage zur Herstellung von Asphalt und entsprechende Anlage Download PDF

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Publication number
EP1727939B1
EP1727939B1 EP05716116A EP05716116A EP1727939B1 EP 1727939 B1 EP1727939 B1 EP 1727939B1 EP 05716116 A EP05716116 A EP 05716116A EP 05716116 A EP05716116 A EP 05716116A EP 1727939 B1 EP1727939 B1 EP 1727939B1
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Prior art keywords
silo
aggregate
hopper
tower
aggregates
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Not-in-force
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EP05716116A
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English (en)
French (fr)
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EP1727939A1 (de
Inventor
Stefano Belloli
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Bernardi Impianti International SpA
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Bernardi Impianti International SpA
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Publication of EP1727939A1 publication Critical patent/EP1727939A1/de
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • E01C19/1072—Supplying or proportioning the ingredients the solid ingredients

Definitions

  • the present invention relates to a method and a tower for batching the aggregates for producing bituminous concretes, and to a plant for asphalt production, as disclosed in GB 907 135 and DE 2327 774 .
  • asphalts are substantially formed of several different components, such as gravel, sand, filler, binder (generally bitumen) and other substances (cork, cellulose, rubber latex, resins, etc.) adapted to give the base product its main features or to enhance said features.
  • binder generally bitumen
  • cork cork, cellulose, rubber latex, resins, etc.
  • asphalts having physical features that are quite different from each other but that, once they have been formulated and established by a designer, must be compulsorily complied with during the production step.
  • this feature is the particle-size curve, i.e. the function defining the sizes and mutual proportioning of the different lithic components. The non-respect of this parameter nullifies the functional character of the product and/or greatly decreases the product duration in time.
  • the production process is completely automatic, except for a very first step.
  • the aggregates follow a route of their own starting with selection of the suitable particle sizes for the formulation to be produced, among the crushed-stone heaps present in the yard, followed by the drying and heating steps, a hot regrading (if necessary), storage in a waiting silo or silo, weighing of the different fractions and introduction into the mixer.
  • batching of all the other components of the formulation takes place and then the subsequent introduction into the mixer according to the times and sequences provided by the automatic operation of the plant.
  • aggregates One of the most critical components to be batched is represented by the aggregates, mainly due to the number and variety of aggregate elements to be batched.
  • a mechanical means generally a mechanical shovel is first used, to pick up the aggregate materials from the storage heaps and separately charge the different particle sizes into the respective hoppers of the feeders, also referred to as pre-batchers.
  • the true production step can begin; the operator starts the automatic control system of the plant recalling the type or number of the formulation to be produced from the central memory of the management computer, inputs the different variable parameters and starts production.
  • the aggregates move from the feeders to the drying plant and are then sent on top of the so-called mixing tower to be batched and introduced into the mixer together with the other formulation elements.
  • some vertically-set areas from top to bottom, can be identified for discharge of each area into the subsequent one by gravity, i.e. the hot-aggregate selecting area, the area of the waiting hoppers, the weighing area, the mixing area and, finally, the area for discharge of the finished product.
  • the area of the waiting hoppers consists of a sheet metal body, in the form of a parallelepiped, internally divided by partitions so as to form as many funnel-shaped sectors as there are aggregate fractions to be distinguished.
  • the automatic system simultaneously operates all the pre-batchers necessary to compose the formulation, so that the aggregates are mixed and on coming out of the drier they must be regraded.
  • the aggregates are conveyed to a vibrating screen disposed in the selecting area on top of the mixing tower.
  • each feeder is provided to contain an already well defined particle-size class that can be used for several formulations. Drying of the aggregates and conveyance of same to the mixing tower takes place individually for each particle size necessary for a particular formulation and in the selecting area on top of the tower there is only a distributor sequentially starting the different particle sizes in the preestablished waiting sector to avoid earlier mixing of said particle sizes. Therefore production of the concrete can only start when the waiting sectors have been all filled.
  • a hopper for weighing the aggregates a hopper is used that is positioned on the vertical of the mixer and under the discharging mouths of the waiting silos. During the mixing period (about 30 seconds) the waiting silo mouths open and close, one at a time and in succession, so that each of them introduces the amount of aggregates provided by the formulation into the underlying hopper.
  • the system automatism carries out control of the weighing operations taking place in succession and closure of the shutter of the concerned silo when the weight required by the formulation has been reached.
  • the sum of the individual weighing operations gives the total amount of the aggregates that will be introduced into the mixer.
  • the shutter of the mixer When, at the end of the mixing time, the shutter of the mixer opens and closes after letting the concrete fall down, the shutter of the hopper weighing the aggregates in turn opens and discharges its contents into the mixer to begin a new cycle.
  • the other elements composing the formulation will be discharged within the times and delays provided by the automatism of the mixer plant.
  • the control system closes the discharge shutter of this aggregate from the corresponding section of the waiting silo.
  • a space is necessarily present that, upon closure of the upper shutter, still contains an undefined amount of falling aggregates that have not yet been weighed. This involves an unavoidable batching in excess.
  • the method, tower and plant in accordance with the invention not only enable the weighing problems typical of known aggregate-weighing systems to be solved, but they also reach the further purpose of solving the problems present in known plants due to the impossibility of precise level indicators being provided and to the requirement of outflow channels discharging the hot aggregates to the ground, which will bring about an important energy waste (note that more than 90% of the thermal and electric energy consumed by the plant is used for heating/drying the aggregates).
  • a further problem in known plants for producing bituminous concretes resides in that, in order to avoid an excessive and unacceptable extension in height of the mixing tower, the space (and therefore the available volume) between the weighing hopper sized for receiving the discharged materials from all waiting silos and the underlying mixer, is limited in height.
  • the direct admission to the mixer of wet milled asphalt to be recycled that in this manner comes into contact with the overheated aggregates already present in the mixer, causes a sudden and uncontrollable formation of vapor. This phenomenon gives rise to a vapor "explosion" in the mixer and, as a result, to an anomalous escape of dusty gases from the hopper case and entrainment of even coarse powders towards the surrounding metal walls.
  • Another aim of the present invention is to solve these problems as well, enabling creation of a suitable free volume for gas expansion over the mixer, without at the same time greatly increasing the tower height or reducing the useful sizes of the different tower components.
  • a method has been devised of of batching the aggregates to be introduced into a mixer of a plant for producing bituminous concretes, which comprises the steps of, for each aggregate to be batched, filling a weighing hopper with the aggregate to be batched and operating discharge of the hopper into the mixer in a batching cycle, through a computerized control system, until the hopper weight that is detected by the computerized control system has decreased by a value that has been previously established to correspond to the aggregate amount to be introduced into the mixer.
  • a tower for mixing the ingredients of a production formulation for a plant producing bituminous concretes which comprises a mixer and means for batching the aggregates to be introduced into the mixer in accordance with the formulation, characterized in that the batching means for each aggregate of the formulation comprises a hopper provided with weighing means to be fed with the aggregate to be batched, and a computerized control system that in a batching cycle operates discharge of the hopper into the mixer until the hopper weight that is detected by the computerized control system through the weighing means has decreased by a value that has been previously established to correspond to the amount of that aggregate to be introduced into the mixer.
  • Also herein claimed in accordance with the invention is a plant equipped with such a mixing tower.
  • Fig. 1 shown in Fig. 1 is a diagram of a plant, generally denoted at 10, for producing bituminous concretes.
  • Plant 10 comprises an area 11 for preparation of the aggregates and an area or tower 12 for measuring or batching and mixing the formulation components.
  • the area 11 for example comprises feeders 13 receiving the aggregates of different particle sizes (picked up by a bucket from storage heaps 22) and sending them to a known drier 14.
  • the hot aggregates coming out of the drier are lifted by a known elevator 15 (a bucket elevator, for example) for reaching the top of the mixing tower in the area 12.
  • a known elevator 15 a bucket elevator, for example
  • the different aggregates are sorted out (by means of a sorting device 16 known by itself) into a plurality of storage or waiting silos 17.
  • the sorting device can be any device of known type, depending on the modes of supplying the aggregates from the area 11. For example, if the aggregates have already been selected in the area 11 and individually sent to the tower to the area 12, the device 16 will be a mere distributor sequentially conveying the different aggregates into the corresponding silos 17. If on the contrary a regrading is necessary on arrival at the tower, the device 16 will be a suitable separating screen. In both cases, silos 17 will each receive one type of aggregate being one component of the formulations to be prepared.
  • the number of silos 16 will be at least the same as the number of the aggregate components that are wished to be kept separate.
  • Each silo 17 has a discharge opening provided with a shutter at the lower part thereof for carrying out discharging, upon command, into an underlying weighing hopper 18 of its own. All hoppers in turn have discharge shutters operated for pouring the aggregates into the underlying known mixer 19. In other words, each particle-size fraction of aggregates is provided with two waiting silos 17, 18 vertically superposed on each other.
  • the other components of the formulation reach the mixer through batching systems 20 (generally weight measuring systems), that are known by themselves and are not herein further described as they can be easily envisaged by a person skilled in the art.
  • batching systems will be designed to add components such as bitumen, filler and several additives provided by the formulation, into the mixer.
  • the mixer has an outlet 21 for ensilage, upon command, of the finished product that will be sent to the use yard.
  • Fig. 2 Shown in greater detail in Fig. 2 is that portion of the mixing tower 12 that is designed to batch the aggregates.
  • one silo alone 17 is fully shown with the related weighing hopper 18 associated therewith.
  • all pairs of silos 17 with the underlying hopper 18 are identical although it is not excluded that they may have features different from each other, and the description of only one of them is sufficient for full understanding of the invention.
  • All hoppers 18 of the different silos 17 discharge into a conveying funnel 25 carrying the aggregates into the underlying mixer 19.
  • the distributor device 16 fills each silo 17 with the assigned aggregate.
  • each silo 17 is suspended on a weighing system 26 (a loading cell, for example) that, after subtracting the tare, gives the net weight of the aggregate contained in the silo and therefore the level reached by the aggregate contained therein.
  • a weighing system 26 a loading cell, for example
  • Each silo 17 is provided with a mechanism of its own 27 operated for discharge of the silo contents to the associated hopper 18 of a lower capacity.
  • the weighing hopper 18 under the silo is in turn provided with a weighing system of its own 28 (a loading cell as well, for example) and with a mechanism 29 operated for discharge of the contents to funnel 25.
  • each silo 17 filled by the distributor device 16 is operated by the control system to feed the respective lower hopper.
  • the weighing system 28 allows the control system to stop feeding of silo 17 when the lower hopper 18 reaches a weight corresponding to a preestablished filling condition (maximum load). In this step it is not important whether after closure of shutter 27 an excess weight is obtained due to the fact that some material was still falling when closure of shutter 27 was operated.
  • the control system can open the discharge shutter (or shutters) 29 and measure the amount of aggregates discharged into the mixer as the weight difference from the starting weight. In this way, when the aggregate weight provided by the particular execution formulation is reached, the control system will close shutter (or shutters) 29 and the tolerance from the provided weight practically will only depend on the driving speed for closing shutter. Thus, the tolerance can be reduced to a minimum.
  • the amount of aggregates of each individual fraction to be introduced into the mixer is established by subtraction from the silo or lower hopper 18.
  • the upper silo 17 can feed the lower silo subsequently to weighing, to restore the provided level, cycle by cycle, if necessary, or the provided level can be restored on reaching a weight fixed as the minimum one for the requirements of the current production.
  • the control system advantageously uses the weighing system 26 with which each silo can be provided.
  • the system using the weight of silo 17 or a signal issuing therefrom and proportional, is surely more precise than the system using simple mechanical minimum- and maximum-indicators and is surely less expensive and less delicate than detecting systems of the "radar" type proposed in some plants of the known art to detect the surface level of the aggregates contained in the silo.
  • the weighing system 26 of each silo 17 enables the computerized control system 23, 24 to stop introduction of material into the silo when a maximum filling level is reached and to maintain the amount of aggregate in the silo within a preestablished minimum and maximum interval.
  • a detection by weight enables an indication of the silo contents instant by instant, which will allow systems of proportional feedback control to be implemented for treatment of the aggregates disposed upstream and for carrying out filling of the silo.
  • the control device can increase or reduce and even stop, if necessary, the speed of extraction of the pre-batcher/pre-batchers cooperating in supplying the silo in question. If the aggregate supply takes place sequentially, on reaching the maximum level provided in the silo, the control system can stop the corresponding feeder and start it again on reaching the minimum level so that the desired level can be restored.
  • the batching system of the invention is precise and does not suffer the unreliabilities typical of the systems of the known art, such as those due to the material discharged from the silo but still moving towards the weighing hopper.
  • the plant can be provided with as many modular units (formed of pairs consisting of waiting silo and weighing hopper) as there are selections of aggregate. All the silo-hopper pairs can be identical with each other and this offers the construction advantage that a certain number of standard parts can be stored and the plant can be then manufactured exactly as desired by the customer in a short period of time and with an undeniable economy of scale.
  • the large free volume over the mixer (obtained through elimination of the hopper for weighing all the aggregates as used in the known art) avoids vapor pressures being formed, which pressures cause clogging and condensate, as present in the known art.
  • the free space can be also advantageously used for known suction means to evacuate the residual gases.
  • Another advantage as compared with the known art is the possibility of carrying out introduction of all the aggregates into the mixer either simultaneously or at different times and/or in sequence, by merely intervening in a suitable manner on the control system. This allows working improvements and/or optimization both in terms of quality of the product and in terms of production times, since it is possible to select the best sequence for introducing the different aggregates into the mixer. For instance, an introduction sequence promoting mixing can be selected.
  • shapes and sizes of the different elements can change depending on specific requirements, as well as the stages for treating the aggregates and the other different components in the formulation.
  • the towers 12 and therefore the different elements 16, 17, 18, 19 can be enclosed in an environment separated from the outside by means of panels that can be insulated and in any case adapted to create a big environment where gas expansion can be allowed.
  • This environment can be constantly maintained under a vacuum by known systems, such as an exhaust fan, and the gases can be conveyed to filtering systems.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Road Paving Machines (AREA)

Claims (17)

  1. Verfahren zum Zumessen der Zuschlagstoffe, die in eine Mischvorrichtung einer Anlage (10) zur Herstellung von Asphaltbeton einzuführen sind, umfassend für jeden zuzumessenden Zuschlagstoff die folgenden Schritte: Befüllen eines Wiegetrichters (18) mit dem zuzumessenden Zuschlagstoff und Durchführung der Entleerung des Trichters in die Mischvorrichtung (19) in einem Zumesszyklus, dadurch gekennzeichnet, dass die Entleerung durch ein computerisiertes Steuersystem (23) durchgeführt wird, bis das Gewicht des Trichters, das durch das computerisierte Steuersystem ermittelt wird, um einen Wert gesunken ist, der vorab so eingestellt wurde, dass er der Zuschlagstoffmenge entspricht, die in den Mischer einzuführen ist.
  2. Verfahren nach Anspruch 1, wobei der Zuschlagstoff, der den Wiegetrichter füllt, von einem Wartesilo (17) an ihn abgegeben wird, der durch das computerisierte Steuersystem derart betrieben wird, dass er den Zuschlagstoff nach einem Zumesszyklus und vor einem neuen Zumesszyklus in den Trichter abgibt, bis ein vorbestimmtes Gewicht des Wiegetrichters erreicht wurde.
  3. Verfahren nach Anspruch 2, wobei der Wartesilo seinerseits einem Wiegevorgang unterzogen wird, um durch das computerisierte Steuersystem die Abgabe von neuem Zuschlagstoff in den Wartesilo durchzuführen, nachdem ein Gewicht des Silos erreicht wurde, das einer Menge entspricht, die vorab als Mindestmenge festgelegt wurde.
  4. Verfahren nach Anspruch 2, wobei die Abgabe von neuem Zuschlagstoff in den Wartesilo durch das computerisierte Steuersystem gestoppt wird, nachdem ein Gewicht des Silos erreicht wurde, das einer Menge entspricht, die vorab als maximale Menge festgelegt wurde.
  5. Turm zum Mischen der Inhaltsstoffe einer Produktionsrezeptur für eine Anlage, die Asphaltbeton herstellt, umfassend eine Mischvorrichtung (19) und ein Mittel zum Zumessen der Zuschlagstoffe, die gemäß der Rezeptur in die Mischvorrichtung einzuführen sind, dadurch gekennzeichnet, dass das Zumessmittel für jeden Zuschlagstoff der Rezeptur umfasst: einen mit einem Wiegemittel (28) versehenen Trichter (18), der mit dem zuzumessenden Zuschlagstoff zu befüllen ist, und ein computerisiertes Steuersystem (23), das in einem Zumesszyklus die Entleerung (29) des Trichters in die Mischvorrichtung durchführt, bis das Trichtergewicht, das vom computerisierten Steuersystem durch das Wiegemittel ermittelt wurde, um einen Wert gesunken ist, der vorab so eingestellt wurde, dass er der Zuschlagstoffmenge entspricht, die in die Mischvorrichtung einzuführen ist.
  6. Turm nach Anspruch 5, dadurch gekennzeichnet, dass er für jeden Wiegetrichter einen Wartesilo (17) umfasst, der durch das computerisierte Steuersystem so betrieben werden kann, dass er nach einem Zumesszyklus und vor einem neuen Zumesszyklus den Zuschlagstoff in den Trichter abgibt, bis ein durch das Wiegemittel des Trichters ermitteltes vorbestimmtes Gewicht erreicht wurde.
  7. Turm nach Anspruch 6, dadurch gekennzeichnet, dass er ein zusätzliches Wartesilo-Wiegemittel (26) umfasst, um durch das computerisierte Steuersystem ein Mittel zur Abgabe von neuem Zuschlagstoff in den Wartesilo zu betreiben, wenn ein durch das zusätzliche Wiegemittel ermitteltes Gewicht erreicht wurde, wobei dieses Gewicht einer Menge entspricht, die vorab als Mindestmenge festgelegt wurde.
  8. Turm nach Anspruch 7, dadurch gekennzeichnet, dass das Mittel zur Abgabe von neuem Zuschlagstoff in den Wartesilo durch das Steuersystem abgeschaltet werden kann, wenn ein vom zusätzlichen Wiegemittel ermitteltes Gewicht des Silos erreicht wurde, wobei dieses Gewicht einer Menge entspricht, die vorab als maximale Menge festgelegt wurde.
  9. Turm nach Anspruch 8, dadurch gekennzeichnet, dass das Mittel zur Abgabe von neuem Zuschlagstoff in den Wartesilo durch das Steuersystem auf der Basis des Silogewichts, wie es von dem zusätzlichen Wiegemittel ermittelt wurde, betrieben werden kann, um die Zuschlagstoffmenge im Silo zwischen den Mengen zu regulieren, die vorab als maximale Menge und Mindestmenge festgelegt wurden.
  10. Turm nach Anspruch 5, dadurch gekennzeichnet, dass er eine Vielzahl von Wartesilos umfasst, die Seite an Seite angeordnet sind, wobei jeder Silo dazu dient, einen Zuschlagstoff mit einer vorbestimmten Partikelgrößenklasse aufzunehmen, und wobei jeder Silo über einem jeweiligen Wiegetrichter angeordnet ist, wobei alle Trichter auf Befehl zur Mischvorrichtung hin entleert werden.
  11. Turm nach Anspruch 10, dadurch gekennzeichnet, dass er ein Verteilmittel (16) umfasst, das die Vielzahl von Zuschlagstoffen je nach der vorbestimmten Partikelgrößenklasse zu den Silos befördert, wobei diese Zuschlagstoffe von einem Trocknungsmittel hierher gelangen.
  12. Turm nach Anspruch 11, dadurch gekennzeichnet, dass das Verteilmittel einen selektierenden Filter für die vorbestimmten Partikelgrößenklassen umfasst, die zu den Silos zu senden sind.
  13. Turm nach Anspruch 11, dadurch gekennzeichnet, dass das Verteilmittel einen Verteiler umfasst, der der Reihe nach einen entsprechenden Silo aus der Vielzahl auswählt, um die gelieferten, bereits vorsortierten Zuschlagstoffe an ihn zu senden.
  14. Turm nach Anspruch 11, dadurch gekennzeichnet, dass die Paare, die aus einem Silo und einem entsprechenden Wiegetrichter gebildet sind, alle miteinander identisch sind, um ein modulares System zum Zumessen der Zuschlagstoffe zu bilden.
  15. Anlage zur Herstellung von Asphaltbeton, umfassend einen Mischturm, wie er in einem der Ansprüche 5 - 14 beansprucht wird.
  16. Anlage nach Anspruch 15, dadurch gekennzeichnet, dass sie umfasst: ein Mittel (14) zum Trocknen der Zuschlagstoffe, wobei dieses Mittel von Zuschlagstoff-Zufuhrmitteln (13) versorgt wird, und ein Hebewerk, das die heißen Zuschlagstoffe zum Mischturm sendet.
  17. Anlage nach Anspruch 16 und Anspruch 15, wenn dieser von Anspruch 13 abhängt, dadurch gekennzeichnet, dass der Turm einen Verteiler umfasst, der einen Silo aus einer Vielzahl von Wartesilos des Turms auswählt, um die Zuschlagstoffe, die vom Trocknungsmittel geliefert wurden und bereits durch ein Sortiermittel stromaufwärts vom Trocknungsmittel für diesen Silo vorsortiert wurden, zu dem ausgewählten Silo zu senden.
EP05716116A 2004-03-22 2005-03-16 Verfahren und Turm für die satzweise Beschickung von Zuschlagstoffen in einer Anlage zur Herstellung von Asphalt und entsprechende Anlage Not-in-force EP1727939B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000547A ITMI20040547A1 (it) 2004-03-22 2004-03-22 Metodo e torre per la dosatura degli aggregati in un impianto di produzione di conglomerati bituminosi e impianto di produzione con essi
PCT/EP2005/002797 WO2005093159A1 (en) 2004-03-22 2005-03-16 Method and tower for batching the aggregates in a plant for producing bituminous concretes and related production plant

Publications (2)

Publication Number Publication Date
EP1727939A1 EP1727939A1 (de) 2006-12-06
EP1727939B1 true EP1727939B1 (de) 2009-05-13

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EP05716116A Not-in-force EP1727939B1 (de) 2004-03-22 2005-03-16 Verfahren und Turm für die satzweise Beschickung von Zuschlagstoffen in einer Anlage zur Herstellung von Asphalt und entsprechende Anlage

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EP (1) EP1727939B1 (de)
CN (1) CN1774544A (de)
AT (1) ATE431461T1 (de)
DE (1) DE602005014454D1 (de)
IT (1) ITMI20040547A1 (de)
RU (1) RU2006137287A (de)
WO (1) WO2005093159A1 (de)

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CN105714650A (zh) * 2016-01-25 2016-06-29 广西大学 一种可计量称重式复配阿尔巴尼亚岩改性沥青专用投放装置及投放方法
CN110589521A (zh) * 2019-10-08 2019-12-20 上海友富新能源科技有限责任公司 一种沥青拌合站冷骨料输送系统
IT202000014320A1 (it) * 2020-06-16 2021-12-16 Simem S P A Impianto per il convogliamento di materiale per la produzione di calcestruzzo strutturale e procedimento

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB907135A (en) * 1958-10-22 1962-10-03 Parker Ltd Frederick Weighing out and dispensing system
DE2327774A1 (de) * 1973-05-30 1974-12-19 Ammann U Maschf Ag Verfahren und anlage zur herstellung eines mineralgemisches mit bituminoesem bindemittel
US3986708A (en) * 1975-06-23 1976-10-19 Heltzel Company Mobile batching plant
US4222498A (en) * 1979-01-17 1980-09-16 Astec Industries, Inc. Control system for aggregate delivery system

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Publication number Publication date
DE602005014454D1 (de) 2009-06-25
ITMI20040547A1 (it) 2004-06-22
CN1774544A (zh) 2006-05-17
RU2006137287A (ru) 2008-04-27
WO2005093159A1 (en) 2005-10-06
EP1727939A1 (de) 2006-12-06
ATE431461T1 (de) 2009-05-15

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