EP0185801A1 - Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete - Google Patents

Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete Download PDF

Info

Publication number
EP0185801A1
EP0185801A1 EP84116485A EP84116485A EP0185801A1 EP 0185801 A1 EP0185801 A1 EP 0185801A1 EP 84116485 A EP84116485 A EP 84116485A EP 84116485 A EP84116485 A EP 84116485A EP 0185801 A1 EP0185801 A1 EP 0185801A1
Authority
EP
European Patent Office
Prior art keywords
mixing
drum
spirals
mixing drum
building material
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Withdrawn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
EP84116485A
Other languages
German (de)
French (fr)
Inventor
Gerhard Schwing
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.)
Friedrich Wilhelm Schwing GmbH
Original Assignee
Friedrich Wilhelm Schwing 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 Friedrich Wilhelm Schwing GmbH filed Critical Friedrich Wilhelm Schwing GmbH
Priority to EP84116485A priority Critical patent/EP0185801A1/en
Priority to EP85113601A priority patent/EP0188674B1/en
Priority to AT85113601T priority patent/ATE64891T1/en
Priority to DE8585113601T priority patent/DE3583390D1/en
Priority to CA000497925A priority patent/CA1282057C/en
Priority to AU51470/85A priority patent/AU583572B2/en
Priority to DD85285297A priority patent/DD242596A5/en
Priority to EG821/85A priority patent/EG17556A/en
Priority to GR853133A priority patent/GR853133B/el
Priority to PL1985257105A priority patent/PL148917B1/en
Priority to TR1/86A priority patent/TR23209A/en
Priority to SU854005006A priority patent/SU1611211A3/en
Priority to BR8506559A priority patent/BR8506559A/en
Priority to JP60299746A priority patent/JPS61217214A/en
Priority to CS859902A priority patent/CZ277964B6/en
Priority to SK9902-85A priority patent/SK277977B6/en
Priority to MX1106A priority patent/MX162412A/en
Priority to CN85109424.4A priority patent/CN1003777B/en
Priority to KR1019850009927A priority patent/KR920010467B1/en
Priority to ZA859860A priority patent/ZA859860B/en
Publication of EP0185801A1 publication Critical patent/EP0185801A1/en
Priority to US07/060,990 priority patent/US4730934A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4268—Drums, e.g. provided with non-rotary mixing blades

Definitions

  • the invention relates to a truck mixer, preferably with opposite emptying for building materials, in particular concrete, according to the preamble of claim 1.
  • the truck mixer according to the invention transports a building material batch in the mixing drum and mixes it on the transport by the rotation of the mixing drum.
  • the building material can also consist of mortar, lime, cement and fireclay mortar also being considered in addition to masonry mortar and plastering mortar.
  • these building materials consist of a special dry mix, which in addition to the aggregates or sand and the additives usually contains hydraulic, but occasionally also non-hydraulic cements and from water. As soon as the water comes into contact with the cement, a chemical process begins in most types of cement, the faster the higher the ambient temperature, the faster the heat of hydration released must be taken into account as an additional heat source.
  • the truck mixer according to the invention enables the mixing water to be added at a time which is more or less shortly before the use of the building material at the construction site, so that the truck mixer transports the dry mix, while driving or at the place of use of the building material because of its deliberately mixing effect which does not impart the building material batch and mix it with the mixing water.
  • the design of the mixing drum in which the truck mixer according to the invention transports the building material, ensures, because of the firmly arranged, spiral-shaped elevations on the inner wall of the mixing drum, a simple structure of this device which, depending on the direction of rotation of the mixing drum, pulls the building material around its central axis or through it closed mixing drum bottom opposite mixing drum opening to the outside.
  • the invention is based on mixing drums of this type, which are usually constructed on the road, as trucks or as truck trailers Allow vehicles to be set up at such an incline that their opening, through which the building material is released or released, is at the top and the closed floor is at the bottom. If the building material has to be transported through narrow cross-sections, such as occur in tunnel construction, mixing drums of the type described can also be built on rail chassis with a horizontal arrangement of the mixing drum axis.
  • the jacket of the mixing drum between the mixing drum base closed with a removable cover and the mixing drum opening has a number of side-by-side manholes depending on the length and the mixing drum diameter, through which the batch of building material is filled, which emerges through the floor with the lid open ;
  • the opening of the mixing drum is often used to pick up the building material from a prefabricated mixing drum for passage through a downstream mixing drum.
  • the transport of such a largely finished building material has the disadvantage that at low ambient temperatures the building material threatens to freeze and at high ambient temperatures premature hardening occurs during transport and during any waiting times on the construction site, unless appropriate countermeasures are taken to avoid this mitigate or avoid any deterioration of the poorer building material.
  • a forced mixing device which has a separate from the mixing drum drive and is located in front of the mixing drum floor installed drive is provided.
  • the compulsory mixing device itself consists of a short shaft arranged in the mixing drum axis, on which several mixing blades are attached. These act below the filling line of the mixing drum, which runs from the lower edge of the outlet opening at a slope of about 25 ° to the upper inner wall, for reasons of economy in order to utilize the capacity of the mixing drum, on the lower part of the batch, which fills the mixing drum tightly above the bottom of the mixing drum.
  • These mixing blades are intended to generate a radial and axial flow of the building material in the compacted building material core described.
  • Such a device actually improves the mixing effect and thereby also enables the dry transport of building materials and the addition of the mixing water outside the mixing systems from which the building material is fed to the truck mixers.
  • truck mixers designed in this way prove to be an extraordinarily complex construction, which is either based on certain truck mixers, e.g. the truck mixer described cannot be used at all for tunnel construction or creates numerous sources of interference due to its complicated structure and is accordingly difficult to maintain.
  • the mixing effect is also unsatisfactory.
  • the building material especially if it is realized with concrete, contains coarse aggregates to a greater or lesser extent, the tools of the compulsory mixer must be protected against being damaged by jammed components of the building material mixture. This can only be achieved if a correspondingly large space is maintained between the compulsory mixing device and the elevations of the drum casing, into which the coarse components can escape, but in which, on the other hand, no compulsory mixing action is achieved.
  • the invention is based on the object of providing a truck mixer of the type initially known as known, which ensures complete mixing and movement of the building material batch through the mixing drum with a simple structure which can therefore generally be used for different truck mixer types.
  • a stream of the building material mixture directed towards the closed mixing drum base is generated in an outer jacket region of the building material batch, which stream reverses inward over the mixing drum base and in the core of the building material mixture enclosed by the elevations of the mixing drum jacket in the direction of the mixing drum opening runs.
  • the truck mixers according to the invention ensure, through the design of their mixing drum, a mixing effect which was previously only possible with stationary mixing machines, although neither whose large dimensions in relation to the content still need to implement additional drives, as is the rule with compulsory mixers.
  • the filling quantity of the truck mixers according to the invention essentially corresponds to the filling quantity of conventional truck mixers of the same dimensions.
  • the invention also has the advantage that the truck mixer can be used as a mixing machine when the mixing drum is full. Therefore, truck mixers according to the invention eliminate the adverse effects of extreme outside temperatures on the quality of the building material in that only the dry mixture of the building material can be transported, which is then mixed and mixed with the mixing water shortly before it is used.
  • the conveying capacity of the counterflow spirals is preferably set up in such a way that an axial speed results in the core of the building material mass, which corresponds approximately to the speed which the mixing spirals in the jacket of the building material mass produce in the opposite direction. It is therefore expedient to implement the features of claim 2.
  • the counter-current spirals generate not only an axial, but also a radial movement component.
  • the movements should be hampered as little as possible by built-in parts, which are nevertheless necessary to fix the counterstorm spiral in the mixing drum in such a way that it is carried by it against the resistance of the building material mass and is not deformed in the process. This is achieved with the features of claim 4.
  • 1 designates a pear-shaped mixing drum which has a closed base and an opening 3 with respect to the base 2, which has no cover and is therefore kept open at all times.
  • the axis of symmetry 4 of the mixing drum shows that it is installed at an incline, the direction of rotation of the mixing drum being indicated by the arrow 5.
  • the shape of the mixing drum provides a lower conical section 6, a subsequent cylindrical section 7 and a conical neck 8 which leads to the opening 3.
  • two mixing spirals 11 and 12 are attached on the inside 9 of the drum shell.
  • the attachment of the mixing spirals is designed so that the mixing spirals are taken along when the drum rotates in the direction of arrow 5 against the resistance of a building material mass 13.
  • the two mixing spirals 11, 12, which are offset by a semicircle, have the same pitch and, generally speaking, represent elevations on the drum shell 9, which protrude into the interior 14 of the drum. If such a mixing drum is constructed on a truck chassis 14 as shown in FIG. 2, it generally has a capacity of between 2.5 and 10 m 3 .
  • a hydraulic drive motor 15 which is fed by a built-in pressure generator 16, rotatable in two directions via a gear 17.
  • the gear 17 acts on the drum base 2 via a flange 18.
  • the rest of the mixing drum rests with a race 19 fastened on the outside of its casing in the region of the neck 8 in a bearing 20 which is arranged so as to be fixed to the structure.
  • a filling funnel 21 In front of the mixing drum opening there is a filling funnel 21 through which a building material mixture can be filled into the drum 1.
  • the mixing drum 1 is driven counter to the direction of the arrow 5 in FIG. 1, the building material is discharged and reaches the prefill container 23 via a chute 22, for example.
  • the two mixing spirals 11, 12 fastened on the inside 9 of the drum casing 10 are designed as solid wall spirals. If the building material mixture is filled into the drum via the filling funnel 21, it must be rotated in the direction of the arrows 5 so that the mixing spirals 11, 12 can move the building material mixture into the interior 14 of the drum. In the embodiment according to FIG. 1, this process is favored by the inclined mounting of the mixing drum. For reasons of economy, the volume of the drum is always fully utilized.
  • the filling line 24 of the drum then runs from the lower edge 25 of the outlet opening approximately at a 25 ° slope to the upper inside of the mixing drum.
  • the drum is full to the head end, ie towards the drum base 2
  • the motor 17 rotates the mixing drum in the direction of the arrow while the vehicle 14 is traveling at low speed.
  • two flat profiles which are curved according to helical lines about the mixing drum axis 4 are fastened for entrainment when the mixing drum rotates, as shown in FIGS. 1 to 3.
  • These flat profiles start from the mixing drum base 2 and end in front of the mixing spirals 11, 12 and the mixing drum opening 3. They are designed in the opposite direction to the mixing spirals 11, 12 and are arranged offset by a semicircle such that they act as counterflow spirals 26, 27. This means that when the building material is mixed, when the mixing drum rotates in the direction of arrow 5, a countercurrent originating from the drum base is generated in the core 28 of the building material filling 13, which core is surrounded by the mixing spirals 11, 12 Fig. 1 is indicated.
  • the countercurrent is directed to the mixing drum opening 3, but ends below the ends of the mixing spirals 11, 12 shown at 31 and 32. that the two counter-current spirals 26, 27 end approximately at the filling line 25 mentioned and thus below the ends 31, 32, as a result of which the ends 31, 32 can reverse the direction of the flow of the building material and the jacket of the building material filling can follow the arrows 33, 34 , which run along the drum wall towards the floor. As soon as the building material particles following this external stream have reached the bottom 2, their direction reverses again according to the arrows 35, 36.
  • the solid wall spirals 11, 12 take the building material mixture against the direction of the arrows 33, 34 and convey it through the opening 3 to the outside.
  • the mix slides off the counter-current spirals 26, 27 until the core of the building material is dissolved, the mass of which is also detected by the solid wall spirals 11, 12 and transported to the outlet opening 3.
  • the counterflow spirals 26, 27 have the same slope as the mixing spirals 11, 12. Furthermore, the width of the flat profiles forming the counterflow spirals 26, 27 is less than the width of the elevations on the mixing drum wall 9 formed by the mixing spirals 11, 12.
  • the flat profiles of the counterflow spirals 2, 6, 27 are fastened to the spirals 11, 12 at several points with the aid of rod-like supports 40, 41.
  • the counter-current spirals 26, 27 are attached directly to the bottom 2 of the drum or to the adjoining drum wall in the lower region of the drum.
  • the chassis 44 of a low-profile carriage which has couplings 45 and 46 for subsequent or advancing transport carriages on its front side and on its rear side, which corresponds to the design and dimensions of the truck mixer 47 shown in FIG is reproduced.
  • the construction of the truck mixer essentially happens from a mixing drum 48, which over the Larger part of its length has a cylindrical jacket 49 and is supported with races in stationary bearings 50 and 51.
  • the bottom 52 of the mixing drum is provided with a cover 53.
  • the opening 54 of the mixing drum opposite the floor is in turn closed with a cover 55.
  • a conical section 56 of the mixing drum forms an elongated transition from the cylindrical part 49 to the opening 54.
  • Such mixing drums are usually about 3 to 7 m long. They can be driven with a motor, which is indicated at 56, but in many cases must be designed as a compressed air drive because of the special tunnel conditions.
  • the building material is introduced into the drum 47 under a mixing station in front of the tunnel through manhole openings shown at 56 to 58.
  • drums have, depending on their length, one to three manholes which are placed one after the other under a downpipe in order to subsequently close the manhole with a cover.
  • truck mixers 47 of the type shown in FIG. 3 are usually coupled in pairs and form a train which transports a larger amount of building material via tracks to the installation site in the tunnel. Depending on the length of the route, the building material must be circulated for the purpose of keeping it fresh. Unless one own power wave is carried in the train, the train must stop en route to start the compressed air motors for the drum rotation at an infeed point.
  • the two mixing spirals 11, 12 are formed in the drum 47, which are fastened to the inside 9 of the mixing drum 47. They extend from the drum base 2 to the opening 54.
  • the two counterflow spirals 26, 27 are provided, which in turn end below the ends 31, 32 of the mixing spirals 11, 12 and thus also break off in front of the opening 54.
  • the mixing spirals 11, 12 push the building material inside the drum against the end of the drum identified by the bottom 2, which is closed with the cover 53 as well as the drum opening 54 through the cover 55.
  • the build-up of the building material on the floor 52 is prevented by the action of the counter-current spirals 26, 27, which is described in connection with the embodiment according to FIGS. 1 and 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

In a transport mixer, preferably with counter-rotational emptying for building materials, particularly concrete, in a mixing drum (1, 47) which possesses one or more shallow raised areas (11, 12) on its interior wall (9), following a helical path and extending from the closed drum base (2) to the drum opening (3, 54), which raised areas are entrained about the drum axis (4) during rotation of the mixing drum (1, 47) and drive the building material (13) in front of the closed drum base during transportation and during mixing, it is envisaged, according to the invention, that one or more shallow profiles (26, 27), curved about the mixing drum axis (4) on a helical path, are fixed in the mixing drum area enclosed by the raised areas, which act as mixing spirals (11, 12), for the purposes of entrainment during rotation (5) of the mixing drum, these shallow profiles starting from the mixing drum base (2) and ending in front of the mixing spirals (11, 12) and the mixing drum opening (3), and are arranged to rotate counter to the mixing spirals (11, 12), in a manner such that, during transportation and during mixing of the building material (13) in the core of the building material filling which is surrounded by the mixing spirals (11, 12) they generate a counterflow (29, 30), starting from the drum base, which reverses its direction below the mixing drum opening (3) at the ends (31, 32) of the mixing spirals (11, 12). <IMAGE>

Description

Die Erfindung betrifft einen Fahrmischer vorzugsweise mit gegenläufiger Entleerung für Baustoffe, insbesondere Beton gemäß dem Oberbegriff des Anspruches 1.The invention relates to a truck mixer, preferably with opposite emptying for building materials, in particular concrete, according to the preamble of claim 1.

Der erfindungsaemäße Fahrmischer transportiert eine Baustoff charge in der Mischtrommel und durchmischt diese auf dem Transport durch die Drehung der Mischtrommel. Der Baustoff kann außer aus Beton auch aus Mörtel bestehen, wobei neben Mauermörtel und Putzmörtel auch Kalk-, Zement-und Schamottmörtel in Betracht kommen. Diese Baustoffe bestehen allgemein gesehen aus einer speziellen Trockenmischung, welche neben den Zuschlägen bzw. Sand und den Zusätzen meistens hydraulische, gelegentlich aber auch nicht hydraulische Zemente enthält und aus Wasser. Sobald das Wasser mit dem Zement zusammenkommt, setzt bei den meisten Zementarten ein chemischer Prozeß ein, welcher umso schneller abläuft, je höher die Umgebungstemperatur ist, wobei man die dabei freigesetzte Hydrationswärme als zusätzliche Wärmequelle berücksichtigen muß. Der erfindungsgemäße Fahrmischer ermöglicht während der Fahrt oder am Verwendungsort des Baustoffes aufarund seiner die Baustoffcharge unwälzenden bewußt mischenden Wirkung den Zusatz des Anmachwassers zu einem Zeitpunkt, welcher mehr oder weniger kurz vor der Verwendung des Baustoffes an der Baustelle liegt, so daß der Fahrmischer die Trockenmischung transportieienund diese mit dem Anmachwasser durchmischen kann.The truck mixer according to the invention transports a building material batch in the mixing drum and mixes it on the transport by the rotation of the mixing drum. In addition to concrete, the building material can also consist of mortar, lime, cement and fireclay mortar also being considered in addition to masonry mortar and plastering mortar. Generally speaking, these building materials consist of a special dry mix, which in addition to the aggregates or sand and the additives usually contains hydraulic, but occasionally also non-hydraulic cements and from water. As soon as the water comes into contact with the cement, a chemical process begins in most types of cement, the faster the higher the ambient temperature, the faster the heat of hydration released must be taken into account as an additional heat source. The truck mixer according to the invention enables the mixing water to be added at a time which is more or less shortly before the use of the building material at the construction site, so that the truck mixer transports the dry mix, while driving or at the place of use of the building material because of its deliberately mixing effect which does not impart the building material batch and mix it with the mixing water.

Die Ausbildung der Mischtrommel, in welcher der erfindungsgemäße Fahrmischer den Baustoff transportiert, gewährleistet wegen der fest angeordneten, spiralförmigen Erhebungen an der Innenwand der Mischtrommel einen einfachen Aufbau dieser Einrichtung, welcher je nach Drehrichtung der Mischtrommel um ihre Mittelachse den Baustoff einzieht oder ihn durch die dem geschlossenen Mischtrommelboden gegenüberliegende Mischtrommelöffnung nach außen abgibt.The design of the mixing drum, in which the truck mixer according to the invention transports the building material, ensures, because of the firmly arranged, spiral-shaped elevations on the inner wall of the mixing drum, a simple structure of this device which, depending on the direction of rotation of the mixing drum, pulls the building material around its central axis or through it closed mixing drum bottom opposite mixing drum opening to the outside.

Die Erfindung geht von derartigen Mischtrommeln aus, welche sich auf meist straßengängigen, als Lkw oder als Lkw-Auflieger ausgebildeten Fahrzeugen derart schräg geneigt aufbauen lassen, daß ihre öffnung, durch die der Baustoff aufgegeben oder abgegeben wird, oben und ihr geschlossener Boden unten liegen. Muß der Baustoff durch enge Querschnitte transportiert werden, wie sie z.B. im Tunnelbau auftreten, so lassen sich Mischtrommeln der beschriebenen Art auch auf Schienenfahrgestellen mit horizontaler Anordnung der Mischtrommelachse aufbauen. In der Regel weist dann der Mantel der Mischtrommel zwischen dem mit einem entfernbaren Deckel verschlossenen Mischtrommelboden und der Mischtrommelöffnung eine von der Länge und dem Mischtrommeldurchmesser abhängige Zahl von nebeneinander angeordneten Mannlöchern auf, durch die die Baustoffcharge eingefüllt wird, die durch den Boden bei geöffnetem Deckel austritt; bei diesen Fahrmischern dient die öffnung der Mischtrommel häufig dazu, den Baustoff aus einer vorgefertigten Mischtrommel zum Durchlauf durch eine nachgeschaltete Mischtrommel aufzunehmen.The invention is based on mixing drums of this type, which are usually constructed on the road, as trucks or as truck trailers Allow vehicles to be set up at such an incline that their opening, through which the building material is released or released, is at the top and the closed floor is at the bottom. If the building material has to be transported through narrow cross-sections, such as occur in tunnel construction, mixing drums of the type described can also be built on rail chassis with a horizontal arrangement of the mixing drum axis. As a rule, the jacket of the mixing drum between the mixing drum base closed with a removable cover and the mixing drum opening has a number of side-by-side manholes depending on the length and the mixing drum diameter, through which the batch of building material is filled, which emerges through the floor with the lid open ; With these truck mixers, the opening of the mixing drum is often used to pick up the building material from a prefabricated mixing drum for passage through a downstream mixing drum.

Bei den bekannten Fahrmischern der beschriebenen Art, von der die Erfindung ausgeht, führt die Treibwirkung der meistens aus Flachstahl bestehenden schraubenlinienförmigen Erhebungen über dem Trommelboden zu starker Verdichtung in dem von den Erhebungen umgebenen Kern der Baustoffcharge, welche für den Transport in die Mischtrommel einqefüllt worden ist. Im inneren Bereich dieses Kerns tritt praktisch keine Mischwirkung und keireTransportwirkung durch die Mischtrommel auf. Das führt dann dazu, daß man gezwungen ist, das Anmachwasser zu einem überwiegenden Teil oder mit seiner Gesamtmenge der Baustoffmischung vor Abfüllung der zu transportierenden Charge zuzugeben, um die notwendige intensive Durchmischung der Trockenmischung mit dem Anmachwasser zu gewährleisten. Der Transport eines derart weitgehend fertiggestellten Baustoffes hat aber den Nachteil, daß bei niedrigen Umgebungstemperaturen der Baustoff einzufrieren droht und bei hohen Umgebungstemperaturen eine vorzeitige Härtung schon beim Transport und bei etwaigen Wartezeiten auf der Baustelle auftritt, wenn nicht entsprechend aufwendige Gegenmaßnahmen getroffen werden, um die dadurch bedingten Verschlechterungen des schlechteren Baustoffes zu mildern oder ganz zu vermeiden.In the known truck mixers of the type described, from which the invention is based, the driving effect of the helical elevations, which mostly consist of flat steel, above the drum base leads to strong compaction in the core of the building material batch surrounded by the elevations, which has been filled into the mixing drum for transport . In the inner area of this core there is practically no mixing effect and no transport effect Mix drum on. This then leads to the fact that the mixing water is forced to be added to most or all of the building material mixture before the batch to be transported is filled, in order to ensure the necessary thorough mixing of the dry mixture with the mixing water. The transport of such a largely finished building material has the disadvantage that at low ambient temperatures the building material threatens to freeze and at high ambient temperatures premature hardening occurs during transport and during any waiting times on the construction site, unless appropriate countermeasures are taken to avoid this mitigate or avoid any deterioration of the poorer building material.

Da aufgrund der beschriebenen Wirkungen der spiralförmigen Erhebungen auch die Bewegungen der Baustoffcharge in der Mischtrommel unzureichend sind, kommt es trotz umlaufender Mischtrommel bei längeren Transport- und Wartezeiten selbst bei günstigen Außentemperaturen zu den erwähnten Baustoffverschlechterungen. Bei vielen Bauarten von Fahrmischern, insbesondere bei den oben beschriebenen Fahrmischerbauarten, die für den Tunnelbau vorgesehen sind, macht aber schon das Drehen der Mischtrommel erhebliche Schwierigkeiten. Denn u.a. bei Fahrmischern für den Tunnelbau sind aus Sicherheitsgründen hierfür Preßluftantriebe vorgesehen, deren Energiequelle stationär angeordnet ist und nicht mitgenommen werden kann.Since the movements of the building material batch in the mixing drum are also insufficient due to the described effects of the spiral elevations, the above-mentioned deterioration of the building material occurs despite longer rotating drum during longer transport and waiting times even at favorable outside temperatures. In many types of truck mixers, especially in the truck mixer types described above, which are intended for tunnel construction, the turning of the mixing drum already makes considerable difficulties. Because, among other things, for truck mixers for tunnel construction are for safety reasons Compressed air drives are provided, the energy source of which is arranged in a stationary manner and cannot be taken along.

Bei Fahrmischern mit der erwähnten schräg geneigten Anordnung der Mischtrommel, wie sie wie bei den meisten straßengängigen Transportfahrzeugen vorgesehen werden, hat man diese Schwierigkeiten bereits zu vermeiden gesucht und zu diesem Zweck eine Zwangsmischeinrichtung vorgesehen, welche mit einem von dem Mischtrommelantrieb getrennten und außen vor dem Mischtrommelboden aufgebauten Antrieb versehen ist. Die Zwangsmischeinrichtung selbst besteht aus einer in der Mischtrommelachse angeordneten kurzen Welle, auf der mehrere Mischflügel befestigt sind. Diese wirken unterhalb der Füllinie der Mischtrommel, die aus Gründen der Wirtschaftlichkeit zur Ausschöpfung des Fassungsvermögens der Mischtrommel von der Unterkante der Auslauföffnung etwa mit 25° Steigung zur oberen Innenwand verläuft, auf den unteren Teil der Charge, welche oberhalb des Mischtrommelbodens die Mischtrommel prall füllt. Diese Mischblätter sollen einen radialen und axialen Strom des Baustoffes in den beschriebenen verdichteten Baustoffkern erzeugen. Eine derartige Einrichtung verbessert tatsächlich die Mischwirkung und ermöglicht dadurch auch den trockenen Baustofftransport und den Zusatz des Anmachwassers außerhalb der Mischanlagen, aus denen der Baustoff den Fahrmischern aufgegeben wird.In truck mixers with the above-mentioned inclined arrangement of the mixing drum, as is the case with most road transport vehicles, efforts have already been made to avoid these difficulties and for this purpose a forced mixing device has been provided, which has a separate from the mixing drum drive and is located in front of the mixing drum floor installed drive is provided. The compulsory mixing device itself consists of a short shaft arranged in the mixing drum axis, on which several mixing blades are attached. These act below the filling line of the mixing drum, which runs from the lower edge of the outlet opening at a slope of about 25 ° to the upper inner wall, for reasons of economy in order to utilize the capacity of the mixing drum, on the lower part of the batch, which fills the mixing drum tightly above the bottom of the mixing drum. These mixing blades are intended to generate a radial and axial flow of the building material in the compacted building material core described. Such a device actually improves the mixing effect and thereby also enables the dry transport of building materials and the addition of the mixing water outside the mixing systems from which the building material is fed to the truck mixers.

Andererseits erweisen sich derart ausgebildete Fahrmischer als außerordentlich aufwendige Konstruktion, die entweder deswegen auf bestimmte Fahrmischer, wie z.B. die beschriebenen Fahrmischer für den Tunnelbau überhaupt nicht anwendbar ist oder wegen ihres komplizierten Aufbaus zahlreiche Störungsquellen schafft und entsprechend schwer zu warten ist. Zudem ist die Mischwirkung auch unbefriedigend. Da nämlich der Baustoff, insbesondere wenn er mit Beton verwirklicht wird, in einem mehr oder weniger großen Umfang grobe Zuschlagstoffe enthält, müssen die Werkzeuge des Zwangsmischers davor beschützt werden, daß sie durch eingeklemmte Bestandteile der Baustoffmischung beschädigt werden können. Das gelingt nur, wenn zwischen der Zwangsmischeinrichtung und den Erhebungen des Trommelmantels ein entsprechend großer Zwischenraum eingehalten wird, in den die groben Bestandteile ausweichen können, in dem aber andererseits auch keine Zwangsmischeinwirkung erzielt wird.On the other hand, truck mixers designed in this way prove to be an extraordinarily complex construction, which is either based on certain truck mixers, e.g. the truck mixer described cannot be used at all for tunnel construction or creates numerous sources of interference due to its complicated structure and is accordingly difficult to maintain. In addition, the mixing effect is also unsatisfactory. Because the building material, especially if it is realized with concrete, contains coarse aggregates to a greater or lesser extent, the tools of the compulsory mixer must be protected against being damaged by jammed components of the building material mixture. This can only be achieved if a correspondingly large space is maintained between the compulsory mixing device and the elevations of the drum casing, into which the coarse components can escape, but in which, on the other hand, no compulsory mixing action is achieved.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, einen Fahrmischer der eingangs als bekannt vorausgesetzten Art zu schaffen, welcher bei einfachem und dadurch allgemein auf unterschiedliche Fahrmischerbauarten anwendbarem Aufbau eine vollständige Durchmischung und Bewegung der Baustoffcharge durch die Mischtrommel gewährleistet.In contrast, the invention is based on the object of providing a truck mixer of the type initially known as known, which ensures complete mixing and movement of the building material batch through the mixing drum with a simple structure which can therefore generally be used for different truck mixer types.

Diese Aufgabe löst die Erfindung mit dem kennzeichnenden Merkmal des Anspruches 1. Zweckmäßige Ausführungsarten der Erfindung sind Gegenstand der Unteransprüche.The invention solves this problem with the characterizing feature of claim 1. Appropriate embodiments of the invention are the subject of the dependent claims.

Gemäß der Erfindung wird bei der für den Transport vorgesehenen Mischtrommeldrehung in einem Außenmantelbereich der Baustoffcharge ein auf den geschlossenen Mischtrommelboden gerichteter Strom der Baustoffmischung erzeugt, welcher sich über dem Mischtrommelboden nach innen umkehrt und in dem von den Erhebungen des Mischtrommelmantels umschlossenen Kern der Baustoffmischung in Richtung auf die Mischtrommelöffnung verläuft. Diese Gegenstrombewegung des beschriebenen Teiles der Baustoffcharge durch die Mischtrommel erhält ihre Energie von den Flachprofilen der konzentrisch inneren Gegenstromspiralen aufgrund deren gegenläufiger Steigung zu den Mischspiralen, die am Trommelmantel befestigt sind. Da aber diese Flachprofile die mischtrommelöffnungsseitigen Enden der die Erhebungen des Mischtrommelmantels bildenden Mischspiralen nicht erreichen, sondern vor diesen und der Mischtrommelöffnung enden, hört die Gegenstromtransportwirkung rechtzeitig auf, so daß der Baustoff durch die Mischtrommelöffnung nicht austreten, sondern von den Erhebungen des Mischtrommelmantels wieder erfaßt und in deren Transportrichtung umgelenkt wird. Die Erfindung erreicht diese Wirkung mit einer mischtrommelfesten inneren Gegenstromspiralenanordnung, welche demgemäß keine gesondert angetriebene Zwangsmischeinrichtung darstellt. Darauf beruht einerseits der praktisch nicht weiter komplizierte Gesamtaufbau des neuen Fahrmischers, aber andererseits auch die Möglichkeit, diesen Fahrmischeraufbau auf flach liegende Mischtrommeln anzuwenden, wie sie bei den beschriebenen Fahrmischern für den Tunnelbau verwendet werden müssen.According to the invention, during the mixing drum rotation intended for transport, a stream of the building material mixture directed towards the closed mixing drum base is generated in an outer jacket region of the building material batch, which stream reverses inward over the mixing drum base and in the core of the building material mixture enclosed by the elevations of the mixing drum jacket in the direction of the mixing drum opening runs. This counter-current movement of the part of the building material batch described by the mixing drum receives its energy from the flat profiles of the concentrically inner counter-current spirals due to their opposite slope to the mixing spirals which are attached to the drum shell. However, since these flat profiles do not reach the ends of the mixing spirals forming the elevations of the mixing drum shell, but rather end in front of them and the mixing drum opening, the countercurrent transport effect ceases in good time, so that the building material does not escape through the mixing drum opening, but instead is picked up again by the elevations of the mixing drum shell and is diverted in the direction of transport. The invention achieves this effect with a mixing drum-resistant inner counter-current spiral arrangement, which accordingly does not represent a separately driven forced mixing device. On the one hand, this is the reason why the overall structure of the new truck mixer is not complicated, but on the other hand it is also possible to use this truck mixer structure on flat-lying mixing drums, as they have to be used for tunnel construction in the truck mixers described.

Bei der Gleichlaufentleerung durch die Mischtrommelbodenöffnung bzw. der Gegenlaufentleerung durch die dem Mischtrommelboden gegenüberliegende, ständig freie Mischtrommelöffnung ist trotz der Umkehr der Strömungsrichtung im Kern der Baustoffcharge infolge der Gegenstrommischspiralen eine vollständige Entleerung der Mischtrommel gewährleistet, weil die Gegenstromspiralen auch eine radiale Bewegung der Baustoffmischung erzeugen und deswegen bei dieser Drehrichtung die Baustoffmischung nach außen in die Mischspiralen fördern, die diesen dann längs der Mischtrommelwand durch die Mischtrommelöffnung nach außen abtransportieren. Diese Wirkung der Gegenstromspiralen entspricht annähernd der eines Freifallmischers und bewirkt deswegen einen Mischeffekt, den bislang die Erhebungen des Mischtrommelmantels nicht haben.In the case of simultaneous emptying through the mixing drum bottom opening or the counterflow emptying through the constantly free mixing drum opening opposite the mixing drum bottom, a complete emptying of the mixing drum is ensured despite the reversal of the flow direction in the core of the building material batch as a result of the countercurrent mixing spirals, because the countercurrent spirals also produce a radial movement of the building material mixture and therefore in this direction of rotation convey the building material mixture to the outside into the mixing spirals, which then transport it along the mixing drum wall through the mixing drum opening to the outside. This effect of the counter-current spirals corresponds approximately to that of a free-fall mixer and therefore brings about a mixing effect that the elevations of the mixing drum shell have not had up to now.

Die erfindungsgemäßen Fahrmischer gewährleisten durch die Ausbildung ihrer Mischtrommel eine Mischwirkung, wie sie bislang nur mit stationären Mischmaschinen erreichbar war, obwohl man weder deren im Verhältnis zum Inhalt große Abmessungen, noch zusätzliche Antriebe zu verwirklichen braucht, wie sie bei Zwangsmischern die Regel sind. Deswegen entspricht die Füllmenge der erfindungsgemäßen Fahrmischer im wesentlichen der Füllmenge konventioneller Fahrmischer gleicher Abmessungen. Dennoch wird erfindungsgemäß verhindert, daß die Baustoffmasse im Bereich des Mischtrommelmantels bei laufender Mischtrommel lediglich um die Achse der Mischtrommel herumfährt. Die Erfindung hat auch bei gefüllter Mischtrommel den Vorteil, daß der Fahrmischer als Mischmaschine eingesetzt werden kann;. deswegen schalten erfindungsgemäße Fahrmischer die nachteiligen Einflüsse extremer Außentemperaturen auf die Qualität des Baustoffes dadurch aus, daß nur die Trockenmischung des Baustoffes transportieren kann, die dann erst kurz vor ihrer Verwendung mit dem Anmachwasser versetzt und vermischt wird.The truck mixers according to the invention ensure, through the design of their mixing drum, a mixing effect which was previously only possible with stationary mixing machines, although neither whose large dimensions in relation to the content still need to implement additional drives, as is the rule with compulsory mixers. For this reason, the filling quantity of the truck mixers according to the invention essentially corresponds to the filling quantity of conventional truck mixers of the same dimensions. Nevertheless, according to the invention it is prevented that the building material mass in the area of the mixing drum casing only moves around the axis of the mixing drum when the mixing drum is running. The invention also has the advantage that the truck mixer can be used as a mixing machine when the mixing drum is full. Therefore, truck mixers according to the invention eliminate the adverse effects of extreme outside temperatures on the quality of the building material in that only the dry mixture of the building material can be transported, which is then mixed and mixed with the mixing water shortly before it is used.

Vorzugsweise richtet man das Fördervermögen der Gegenstromspiralen so ein, daß sich im Kern der Baustoffmasse eine axiale Geschwindigkeit ergibt, welche etwa der Geschwindigkeit entspricht, welche die Mischspiralen im Mantel der Baustoffmasse in Gegenrichtung erzeugen. Daher ist es zweckmäßig, die Merkmale des Anspruches 2 zu verwirklichen.The conveying capacity of the counterflow spirals is preferably set up in such a way that an axial speed results in the core of the building material mass, which corresponds approximately to the speed which the mixing spirals in the jacket of the building material mass produce in the opposite direction. It is therefore expedient to implement the features of claim 2.

Andererseits empfiehlt es sich, durch eine gedrängte Bauart auf den verhältnismäßig engen Raum Rücksicht zu nehmen,in dem sich der Kern der Baustoffmasse befindet. Zu diesem Zweck sind die Merkmale des Anspruches 3 vorgesehen.On the other hand, it is advisable to use a compact design on the relatively narrow Consider space in which the core of the building material mass is located. For this purpose, the features of claim 3 are provided.

Die Gegenstromspiralen erzeugen jedoch nicht nur eine axiale, sondern auch eine radiale Bewegungskomponente. Die Bewegungen sollten möglichst wenig von Einbauteilen behindert werden, die gleichwohl erforderlich sind, um die Gegenstormspirale in der Mischtrommel so festzulegen, daß sie von dieser gegen den Widerstand der Baustoffmasse mitgenommen und dabei nicht verformt werden. Das gelingt mit den Merkmalen des. Anspruches 4.However, the counter-current spirals generate not only an axial, but also a radial movement component. The movements should be hampered as little as possible by built-in parts, which are nevertheless necessary to fix the counterstorm spiral in the mixing drum in such a way that it is carried by it against the resistance of the building material mass and is not deformed in the process. This is achieved with the features of claim 4.

Die Einzelheiten, weiteren Merkmale und andere Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von erfindungsgemäßen Ausführungsformen, die in den Figuren der Zeichnung wiedergegeben sind. Es zeigen

  • Fig. 1 in Seitenansicht eine Mischtrommel gemäß der Erfindung, wie sie in dem straßengängigen Fahrmischer Verwendung findet, wobei die Mischtrommel selbst zur Verdeutlichung der Verhältnisse während des Mischens durchsichtig gezeichnet ist,
  • Fig. 2 einen straßengängigen Fahrmischer, auf dem eine Mischtrommel nach Fig. 1 aufgebaut ist in Seitenansicht und
  • Fig. 3 einen schienengängigen Fahrmischer gemäß der Erfindung, wie er u.a. im Tunnelbau verwendet wird.
The details, further features and other advantages of the invention result from the following description of embodiments according to the invention, which are shown in the figures of the drawing. Show it
  • 1 is a side view of a mixing drum according to the invention, as used in the road mixer truck, the mixing drum itself being drawn transparently to illustrate the conditions during mixing,
  • Fig. 2 shows a road mixer truck on which a mixing drum according to FIG. 1 is built in side view and
  • Fig. 3 shows a rail-type truck mixer according to the invention, as is used, inter alia, in tunnel construction.

In der Darstellung der Fig. 1 bezeichnet 1 eine birnenförmige Mischtrommel, welche einen geschlossenen Boden und gegenüber dem Boden 2 eine öffnung 3 aufweist, welche deckellos ist und daher ständig offengehalten wird. Die Symmetrieachse 4 der Mischtrommel verdeutlicht, daß diese schräggeneigt eingebaut wird, wobei die Drehrichtung der Mischtrommel durch den Pfeil 5 angedeutet ist.In the illustration in FIG. 1, 1 designates a pear-shaped mixing drum which has a closed base and an opening 3 with respect to the base 2, which has no cover and is therefore kept open at all times. The axis of symmetry 4 of the mixing drum shows that it is installed at an incline, the direction of rotation of the mixing drum being indicated by the arrow 5.

Die Formgebung der Mischtrommel sieht einen unteren konischen Abschnitt 6, einen darauf folgenden zylindrischen Abschnitt 7 und einen konischen Hals 8 vor, welcher zur Öffnung 3 führt. Auf der Innenseite 9 des allgemein mit 10 bezeichneten Trommelmantels sind zwei Mischspiralen 11 bzw. 12 befestigt. Die Befestigung der Mischspiralen ist so ausgebildet, daß die Mischspiralen beim Umlauf der Trommel in Richtung des Pfeiles 5 gegen den Widerstand einer Baustoffmasse 13 mitgenommen werden. Die beiden um einen Halbkreis versetzten Mischspiralen 11, 12 besitzen gleiche Steigung und stellen allgemein gesehen Erhebungen auf dem Trommelmantel 9 dar, welche in den Innenraum 14 der Trommel vorkragen. Wenn eine solche Mischtrommel gemäß der Darstellung der Fig. 2 auf einem Lkw-Fahrgestell 14 aufgebaut ist, hat sie in der Regel ein Fassungsvermögen zwischen 2,5 und 10 m3. Sie ist mit Hilfe eines hydraulischen Antriebsmotors 15, der von einem eingebauten Druckerzeuger 16 gespeist wird, über ein Getriebe 17 in zwei Richtungen drehbar. Das Getriebe 17 wirkt über einen Flansch 18 auf den Trommelboden 2. Im übrigen ruht die Mischtrommel mit einem außen auf ihrem Mantel im Bereich des Halses 8 befestigten Laufring 19 in einem Lager 20, das aufbaufest angeordnet ist. Vor der Mischtrommelöffnung befindet sich ein Fülltrichter 21, durch den eine Baustoffmischung in die Trommel 1 eingefüllt werden kann. Bei Antrieb der Mischtrommel 1 entgegen der Richtung des Pfeiles 5 in Fig. 1 wird der Baustoff ausgetragen und gelangt über eine Schurre 22 beispielsweise in den Vorfüllbehälter 23.The shape of the mixing drum provides a lower conical section 6, a subsequent cylindrical section 7 and a conical neck 8 which leads to the opening 3. On the inside 9 of the drum shell, generally designated 10, two mixing spirals 11 and 12 are attached. The attachment of the mixing spirals is designed so that the mixing spirals are taken along when the drum rotates in the direction of arrow 5 against the resistance of a building material mass 13. The two mixing spirals 11, 12, which are offset by a semicircle, have the same pitch and, generally speaking, represent elevations on the drum shell 9, which protrude into the interior 14 of the drum. If such a mixing drum is constructed on a truck chassis 14 as shown in FIG. 2, it generally has a capacity of between 2.5 and 10 m 3 . She is with help a hydraulic drive motor 15, which is fed by a built-in pressure generator 16, rotatable in two directions via a gear 17. The gear 17 acts on the drum base 2 via a flange 18. The rest of the mixing drum rests with a race 19 fastened on the outside of its casing in the region of the neck 8 in a bearing 20 which is arranged so as to be fixed to the structure. In front of the mixing drum opening there is a filling funnel 21 through which a building material mixture can be filled into the drum 1. When the mixing drum 1 is driven counter to the direction of the arrow 5 in FIG. 1, the building material is discharged and reaches the prefill container 23 via a chute 22, for example.

Die beiden auf der Innenseite 9 des Trommelmantels 10 befestigten Mischspiralen 11, 12 sind als Vollwandspiralen ausgebildet. Wird die Baustoffmischung über den Fülltrichter 21 in die Trommel eingefüllt, so muß diese in Richtung des Pfeilen 5 gedreht werden, damit die Mischspiralen 11, 12 die Baustoffmischung in den Innenraum 14 der Trommel bewegen kann. Bei der Ausführungsform nach Fig. 1 wird dieser Vorgang durch die schräg ansteigende Lagerung der Mischtrommel begünstigt. Aus Gründen der Wirtschaftlichkeit wird das Fassungsvolumen der Trommel stets voll ausgeschöpft. Die Füllinie 24 der Trommel verläuft dann von der Unterkante 25 der Auslauföffnung etwa mit 25° Steigung zur oberen Innenseite der Mischtrommel. Hinter bzw. unter dieser Fülllinie 24 ist die Trommel bis zum Kopfende, d.h. in Richtung auf den Trommelboden 2 prall gefüllt Je nach Transportdauer bzw. Wegstrecke ist es erforderlich, den Inhalt der Mischtrommel in Bewegung zu halten, um den Beginn des Abbindeprozesses nicht eintreten zu lassen, sofern der Baustoff mit dem Anmachwasser zusammen eingefüllt worden ist. Zu diesem Zweck dreht der Motor 17 die Mischtrommel in Richtung des Pfeiles während der Fahrt des Fahrzeuges 14 mit geringer Drehzahl.The two mixing spirals 11, 12 fastened on the inside 9 of the drum casing 10 are designed as solid wall spirals. If the building material mixture is filled into the drum via the filling funnel 21, it must be rotated in the direction of the arrows 5 so that the mixing spirals 11, 12 can move the building material mixture into the interior 14 of the drum. In the embodiment according to FIG. 1, this process is favored by the inclined mounting of the mixing drum. For reasons of economy, the volume of the drum is always fully utilized. The filling line 24 of the drum then runs from the lower edge 25 of the outlet opening approximately at a 25 ° slope to the upper inside of the mixing drum. Behind or under this fill line 24 the drum is full to the head end, ie towards the drum base 2 Depending on the transport duration or distance, it may be necessary to keep the contents of the mixing drum in motion so that the start of the setting process does not occur, provided the building material has been filled in together with the mixing water. For this purpose, the motor 17 rotates the mixing drum in the direction of the arrow while the vehicle 14 is traveling at low speed.

In dem von den Mischspiralen 11, 12 umschlossenen Mischtrommelraum sind gemäß der Darstellungen in den Fig. 1 bis 3 zwei nach Schraubenlinien um die Mischtrommelachse 4 gekrümmte Flachprofile zur Mitnahme bei der Mischtrommeldrehung befestigt. Diese Flachprofile gehen vom Mischtrommelboden 2 aus und enden vor den Mischspiralen 11, 12 und der Mischtrommelöffnung 3. Sie sind derart gegenläufig zu den Mischspiralen 11, 12 ausgebildet und wie diese um einen Halbkreis versetzt angeordnet, daß sie als Gegenstromspiralen 26, 27 wirken. Das heißt, daß beim Mischen des Baustoffes bei Drehung der Mischtrommel in Richtung des Pfeiles 5 in dem von den Mischspiralen 11, 12 umgebenen Kern 28 der Baustoffüllung 13 ein von dem Trommelboden ausgehender Gegenstrom erzeugt wird, der schematisch durch die inneren Pfeilpaare 29, 30 in Fig. 1 angedeutet ist. Der Gegenstrom ist auf die Mischtrommelöffnung 3 gerichtet, endet aber unterhalb der bei 31 und 32 wiedergegebenen Enden der Mischspiralen 11, 12. Das beruht darauf, daß die beiden Gegenstromspiralen 26, 27 etwa an der erwähnten Füllinie 25 und damit unterhalb der Enden 31, 32 zu Ende sind, wodurch die Enden 31, 32 die Richtung des Baustoffstromes umkehren können und der Mantel der Baustoffüllung den Pfeilen 33, 34 zu folgen vermag, welche längs der Trommelwand in Richtung auf den Boden verlaufen. Sobald die diesem äußeren Strom folgenden Baustoffpartikel den Boden 2 erreicht haben, kehrt sich ihre Richtung entsprechend den Pfeilen 35, 36 erneut um.In the mixing drum space enclosed by the mixing spirals 11, 12, two flat profiles which are curved according to helical lines about the mixing drum axis 4 are fastened for entrainment when the mixing drum rotates, as shown in FIGS. 1 to 3. These flat profiles start from the mixing drum base 2 and end in front of the mixing spirals 11, 12 and the mixing drum opening 3. They are designed in the opposite direction to the mixing spirals 11, 12 and are arranged offset by a semicircle such that they act as counterflow spirals 26, 27. This means that when the building material is mixed, when the mixing drum rotates in the direction of arrow 5, a countercurrent originating from the drum base is generated in the core 28 of the building material filling 13, which core is surrounded by the mixing spirals 11, 12 Fig. 1 is indicated. The countercurrent is directed to the mixing drum opening 3, but ends below the ends of the mixing spirals 11, 12 shown at 31 and 32. that the two counter-current spirals 26, 27 end approximately at the filling line 25 mentioned and thus below the ends 31, 32, as a result of which the ends 31, 32 can reverse the direction of the flow of the building material and the jacket of the building material filling can follow the arrows 33, 34 , which run along the drum wall towards the floor. As soon as the building material particles following this external stream have reached the bottom 2, their direction reverses again according to the arrows 35, 36.

Diese gegenläufigen Ströme in der Mischtrcmmel verhindern, daß sich besonders im unteren Teil der Mischtrommel, welche von dem Konus 6 gebildet wird, eine kompakte Baustoffmasse bildet. Vielmehr bewirken die Gegenstromspiralen 26, 27 eine intensive Umwälzung der Baustoffmasse und damit sogleich eine bessere Verteilung des in der Baustoffmischung enthaltenen Bindemittels, des Feinsandes und der verschiedenen Körnungen der Zuschlagstoffe. Das geschieht auch im trockenen Zustand der Baustoffmasse. Bei Wasserzugabe wird eine gleichmäßige Durchwässerung beschleunigt und intensiviert.These opposing flows in the mixing drum prevent a compact building material mass from forming, particularly in the lower part of the mixing drum, which is formed by the cone 6. Rather, the counter-current spirals 26, 27 cause an intensive circulation of the building material mass and thus immediately a better distribution of the binder contained in the building material mixture, the fine sand and the different grain sizes of the additives. This also happens when the building material is dry. When water is added, even watering is accelerated and intensified.

Bei der erwähnten Umsteuerung der Drehrichtung der Mischtrommel 1 nehmen die Vollwandspiralen 11, 12 die Baustoffmischung entgegen der Richtung der Pfeile 33, 34 mit und fördern ihn durch die Öffnung 3 nach außen. Dabei gleitet mit zunehmender Entleerung der Mischtrommel das Mischgut von den Gegenstromspiralen 26, 27 ab, bis der Baustoffkern aufgelöst ist, dessen Masse ebenfalls von den Vollwandspiralen 11, 12 erfaßt und zur Austrittsöffnung 3 transportiert wird.In the aforementioned reversal of the direction of rotation of the mixing drum 1, the solid wall spirals 11, 12 take the building material mixture against the direction of the arrows 33, 34 and convey it through the opening 3 to the outside. With increasing emptying of the mixing drum, the mix slides off the counter-current spirals 26, 27 until the core of the building material is dissolved, the mass of which is also detected by the solid wall spirals 11, 12 and transported to the outlet opening 3.

Aus der Darstellung der Fig. 1 ergibt sich ferner, daß die Gegenstromspiralen 26, 27 die gleiche Steigung wie die Mischspiralen 11, 12 aufweisen. Ferner ist die Breite der die Gegenstromspiralen 26, 27 bildenden Flachprofile geringer als die Breite der von den Mischspiralen 11, 12 gebildeten Erhebungen an der Mischtrommelwand 9.1 that the counterflow spirals 26, 27 have the same slope as the mixing spirals 11, 12. Furthermore, the width of the flat profiles forming the counterflow spirals 26, 27 is less than the width of the elevations on the mixing drum wall 9 formed by the mixing spirals 11, 12.

Die Flachprofile der Gegenstromspiralen 2,6, 27 sind mit Hilfe von stangenartigen Trägern 40, 41 an mehreren Stellen an den Spiralen 11, 12 befestigt. Außerdem sind im unteren Bereich der Trommel die Gegenstromspiralen 26, 27 unmittelbar am Boden 2 der Trommel bzw. an der anschließenden Trommelwand befestigt.The flat profiles of the counterflow spirals 2, 6, 27 are fastened to the spirals 11, 12 at several points with the aid of rod-like supports 40, 41. In addition, the counter-current spirals 26, 27 are attached directly to the bottom 2 of the drum or to the adjoining drum wall in the lower region of the drum.

Die Ausführungsform nach Fig. 3 ist für den Tunnelbau gedacht. Auf schienengängigen Drehgestellen 42, 43 fährt das Chassis 44 eines niedrig bauenden Wagens, welcher an seiner Stirnseite und an seiner Rückseite Kupplungen 45 bzw. 46 für nachfolgende oder vorlaufende Transportwagen aufweisen, die der Ausbildung und Abmessungen dem Fahrmischer 47 entsprechen, der in Fig. 3 wiedergegeben ist.3 is intended for tunnel construction. The chassis 44 of a low-profile carriage, which has couplings 45 and 46 for subsequent or advancing transport carriages on its front side and on its rear side, which corresponds to the design and dimensions of the truck mixer 47 shown in FIG is reproduced.

Der Aufbau des Fahrmischers geschieht im wesentlichen aus einer Mischtrommel 48, welche über den größeren Teil ihrer Länge einen zylindrischen Mantel 49 aufweist und mit Laufringen in stationären Lagern 50 und 51 abgestützt ist. Der Boden 52 der Mischtrommel ist mit einem Deckel 53 versehen. Die dem Boden gegenüberliegende öffnung 54 der Mischtrommel ist ihrerseits mit einem Deckel 55 verschlossen. Ein konischer Abschnitt 56 der Mischtrommel bildet einen gestreckten Übergang vom zylindrischen Teil 49 bis zur Öffnung 54.The construction of the truck mixer essentially happens from a mixing drum 48, which over the Larger part of its length has a cylindrical jacket 49 and is supported with races in stationary bearings 50 and 51. The bottom 52 of the mixing drum is provided with a cover 53. The opening 54 of the mixing drum opposite the floor is in turn closed with a cover 55. A conical section 56 of the mixing drum forms an elongated transition from the cylindrical part 49 to the opening 54.

Normalerweise sind derartige Mischtrommeln etwa 3 bis 7 m lang. Sie können mit einem Motor angetrieben werden, der bei 56 angedeutet ist, aber wegen der speziellen Tunnelverhältnisse in vielen Fällen als Preßluftantrieb ausgebildet werden muß.Such mixing drums are usually about 3 to 7 m long. They can be driven with a motor, which is indicated at 56, but in many cases must be designed as a compressed air drive because of the special tunnel conditions.

Der Baustoff wird unter einer Mischstation vor dem Tunnel durch bei 56 bis 58 daraestellte Mannloch- öffnungen in die Trommel 47 eingebracht. Im allgemeinen besitzen derartige Trommeln je nach Länge ein bis drei Mannlöcher, welche nacheinander unter ein Fallrohr verbracht werden, um anschließend das Mannloch mit einem Deckel zu verschließen. Ferner werden Fahrmischer 47 der aus Fig. 3 ersichtlichen Art meistens zu mehreren gekuppelt und bilden einen Zug, der eine größere Baustoffmenge über Gleise zur Einbaustelle im Tunnel transportiert. Je nach Länge der Fahrstrecke bedarf es des Umwälzens des Baustoffes zum Zwecke des Frischhaltens. Sofern nicht eine eigene Kraftwelle im Zug mitgeführt wird, muß der Zug unterweg anhalten, um an einer Einspeisestelle die Preßluftmotoren für die Trommeldrehung in Gang zu setzen.The building material is introduced into the drum 47 under a mixing station in front of the tunnel through manhole openings shown at 56 to 58. In general, such drums have, depending on their length, one to three manholes which are placed one after the other under a downpipe in order to subsequently close the manhole with a cover. Furthermore, truck mixers 47 of the type shown in FIG. 3 are usually coupled in pairs and form a train which transports a larger amount of building material via tracks to the installation site in the tunnel. Depending on the length of the route, the building material must be circulated for the purpose of keeping it fresh. Unless one own power wave is carried in the train, the train must stop en route to start the compressed air motors for the drum rotation at an infeed point.

In der Trommel 47 sind wiederum die beiden Mischspiralen 11, 12 ausgebildet, die an der Innenseite 9 der Mischtrommel 47 befestigt sind. Sie reichen vom Trommelboden 2 bis zur Öffnung 54. Außerdem sind die beiden Gegenstromspiralen 26, 27 vorgesehen, welche wiederum unterhalb der Enden 31, 32 der Mischspiralen 11, 12 zu Ende sind und damit auch vor der öffnung 54 abbrechen.In turn, the two mixing spirals 11, 12 are formed in the drum 47, which are fastened to the inside 9 of the mixing drum 47. They extend from the drum base 2 to the opening 54. In addition, the two counterflow spirals 26, 27 are provided, which in turn end below the ends 31, 32 of the mixing spirals 11, 12 and thus also break off in front of the opening 54.

Während des Transportes des durch die drei Mannlöcher 56 bis 58 eingefüllten Baustoffes schieben die Mischspiralen 11, 12 den Baustoff innerhalb der Trommel gegen das durch den Boden 2 identifizierte Trommelende, das mit dem Deckel 53 ebenso verschlossen ist wie die Trommelöffnung 54 durch den Deckel 55. Das Aufstauen des Baustoffes auf den Boden 52 wird durch die Wirkung der Gegenstromspiralen 26, 27 verhindert, welche im Zusammenhang mit der Ausführungsform nach den Figuren 1 und 2 beschrieben ist.During the transport of the building material filled through the three manholes 56 to 58, the mixing spirals 11, 12 push the building material inside the drum against the end of the drum identified by the bottom 2, which is closed with the cover 53 as well as the drum opening 54 through the cover 55. The build-up of the building material on the floor 52 is prevented by the action of the counter-current spirals 26, 27, which is described in connection with the embodiment according to FIGS. 1 and 2.

Neuartig ist die bei der beschriebenen Ausführungsart der Fahrmischer 27 auftretende Mischwirkung, die der eines Freifallmischers entspricht. Wenn nämlich die Gegenstromspiralen 26, 27 den Baustoff in entgegengesetzter Richtung fördern, führen sie zu einer Auflichtung und Rückführung des Baustoffes im Kern, der von den Mischspiralen 11, 12 umschlossen ist. Dadurch werden Freiräume geschaffen, welche die Durchmischung des Baustoffes im freien Fall ermöglichen.What is new is the mixing effect that occurs in the described embodiment of the truck mixer 27, which corresponds to that of a free-fall mixer. If the counter-current spirals 26, 27 convey the building material in the opposite direction, they lead to an illumination and return of the building material in the core, which is enclosed by the mixing spirals 11, 12. This creates free spaces that allow the building material to mix in free fall.

Claims (6)

1, Fahrmischer, vorzugsweise mit Gegenlaufentleerung für Baustoffe, insbesondere Beton in einer Mischtrommel, welche auf ihrer Innenwand eine oder mehrere einer Schraubenlinie folgende, vom geschlossenen Trommelboden bis zur Trommelöffnung reichende, flache Erhebungen aufweist, welche bei Drehung der Mischtrommel um die Trommelachse mitgenommen werden und beim Transport und beim Mischen den Baustoff vor den geschlossenen Trommelboden treiben, dadurch gekennzeichnet, daß in dem von den als Mischspiralen (11, 12) wirkenden Erhebungen umschlossenen Mischtrommelraum eine oder mehrere nach Schraubenlinien um die Mischtrommelachse (4) gekrümmte Flachprofile (26, 27) zur Mitnahme bei der Mischtrommeldrehung (5) befestigt sind, welche vom Mischtrommelboden (2) ausgehen und vor den Mischspiralen (11, 12) und der Mischtrommelöffnung (3) enden, sowie derart gegenläufig zu den Mischspiralen (11, 12) angeordnet sind, daß sie beim Transport und beim Mischen des Baustoffes (13) in dem von den Mischspiralen (11, 12) umgebenen Kern der Baustoffüllung einen von dem Trommelboden ausgehenden Gegenstrom (29, 30) erzeugen, welcher seine Richtung unter der Mischtrommelöffnung (3) an den Enden (31, 32) der Mischspiralen (11, 12) umkehrt. 1 , truck mixer, preferably with counterflow emptying for building materials, in particular concrete in a mixing drum, which has on its inner wall one or more flat elevations following a helix, extending from the closed drum base to the drum opening, which are carried along when the mixing drum rotates about the drum axis and drive the building material in front of the closed drum base during transport and mixing, characterized in that in the mixing drum space enclosed by the elevations acting as mixing spirals (11, 12) one or more flat profiles (26, 27) curved according to helical lines around the mixing drum axis (4) are attached to take with the mixing drum rotation (5), which start from the mixing drum base (2) and end in front of the mixing spirals (11, 12) and the mixing drum opening (3), and are arranged in the opposite direction to the mixing spirals (11, 12) that when transporting and mixing the building material (13) in the mix spiral (11, 12) surrounding core of the building material filling produce a countercurrent (29, 30) starting from the drum base, which reverses its direction under the mixing drum opening (3) at the ends (31, 32) of the mixing spirals (11, 12). 2. Fahrmischer nach Anspruch 1 , dadurch gekennzeichnet, daß die Gegenstromspiralen (26, 27) die gleiche Steigung wie die Mischspiralen (11, 12) aufweisen.2. Truck mixer according to claim 1, characterized in that the counter-current spirals (26, 27) have the same slope as the mixing spirals (11, 12). 3. Fahrmischer nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Breite der die Gegenstromspiralen (26, 27) bildenden Flachprofile geringer als die Breite der Erhebungen (11, 12) an der Mischtrommelwand (9) ist, welche die Mischspiralen (11, 12) bilden.3. Truck mixer according to one of claims 1 or 2, characterized in that the width of the countercurrent spirals (26, 27) forming flat profiles is less than the width of the elevations (11, 12) on the mixing drum wall (9) which the mixing spirals ( 11, 12) form. 4. Fahrmischer nach einem der Ansprüche 1 bis 3, dadurch gekennzeicnet, daß die Flachprofile der Gegenstromspiralen (26, 27) an den Erhebungen der Mischspiralen (11, 12) und über dem Mischtrommelboden (2) an der Mischtrommelwand (9) befestigt sind.4. truck mixer according to one of claims 1 to 3, characterized gekennzeicnet that the flat profiles of the countercurrent spirals (26, 27) on the elevations of the mixing spirals (11, 12) and above the mixing drum base (2) on the mixing drum wall (9) are attached. 5. Fahrmischer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Mischtrommel (1) schräg ansteigend mit unten liegendem Boden (2) und oben liegender öffnung (3) auf dem Chassis eines Transportfahrzeuges (14) verlagert ist.5. Truck mixer according to one of claims 1 to 4, characterized in that the mixing drum (1) is inclined with the bottom (2) and the top opening (3) on the chassis of a transport vehicle (14). 6. Fahrmischer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Mischtrommel (47) horizontal auf dem Chassis (44) eines Fahrzeuges verlagert ist und der Mischtrommelboden (2) sowie die Mischtrommelöffnung (54) mit Deckeln (53, 54) verschließbar sind.6. Truck mixer according to one of claims 1 to 4, characterized in that the mixing drum (47) is displaced horizontally on the chassis (44) of a vehicle and the mixing drum base (2) and the mixer drum opening (54) with covers (53, 54) can be closed.
EP84116485A 1984-12-28 1984-12-28 Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete Withdrawn EP0185801A1 (en)

Priority Applications (21)

Application Number Priority Date Filing Date Title
EP84116485A EP0185801A1 (en) 1984-12-28 1984-12-28 Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete
EP85113601A EP0188674B1 (en) 1984-12-28 1985-10-25 Transportable mixer, preferably having a reversed-running emptying facility for building materials, especially concrete
AT85113601T ATE64891T1 (en) 1984-12-28 1985-10-25 TRUCK MIXER, PREFERABLE WITH CONTRA-FLOW EMPTYING FOR BUILDING MATERIALS, ESPECIALLY CONCRETE.
DE8585113601T DE3583390D1 (en) 1984-12-28 1985-10-25 VEHICLE MIXER, PREFERABLY WITH COUNTERFLOW DRAINING FOR BUILDING MATERIALS, IN PARTICULAR CONCRETE.
CA000497925A CA1282057C (en) 1984-12-28 1985-12-17 Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete
AU51470/85A AU583572B2 (en) 1984-12-28 1985-12-19 Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete
DD85285297A DD242596A5 (en) 1984-12-28 1985-12-20 MIXER PREFERABLE WITH COUNTERFLY DISCHARGE FOR CONSTRUCTION MATERIALS, ESPECIALLY CONCRETE
EG821/85A EG17556A (en) 1984-12-28 1985-12-22 Mobile mixer preferably having counter rotational,emptying for building materials in particular concrete
GR853133A GR853133B (en) 1984-12-28 1985-12-23
PL1985257105A PL148917B1 (en) 1984-12-28 1985-12-24 Mobile mixer,preferably with backward discharge
TR1/86A TR23209A (en) 1984-12-28 1985-12-25 CONSTRUCTION MATERIALS BILHASSA CONCRETE FOR TERCIHAN REVERSE PIPING MIXER
SU854005006A SU1611211A3 (en) 1984-12-28 1985-12-26 Mobile mixer
BR8506559A BR8506559A (en) 1984-12-28 1985-12-27 MOBILE MIXER, PREFERRED WITH EMPTY EMPTY EMPTY, FOR CONSTRUCTION MATERIALS, ESPECIALLY CONCRETE
JP60299746A JPS61217214A (en) 1984-12-28 1985-12-27 Car mixer discharging material of construction such as concrete in opposite direction
CS859902A CZ277964B6 (en) 1984-12-28 1985-12-27 Mobile mixer with reverse run discharging for transport of building materials.
SK9902-85A SK277977B6 (en) 1984-12-28 1985-12-27 Mobile mixer, mainly with evacuating by return motion for transport of building matter, mainly concrete mixture
MX1106A MX162412A (en) 1984-12-28 1985-12-27 MOBILE MIXER, PREFERABLY WITH CONTRARROTATIONAL DRAIN, FOR CONSTRUCTION MATERIALS, IN PARTICULAR CONCRETE
CN85109424.4A CN1003777B (en) 1984-12-28 1985-12-28 Agitating lorry using countercurrent discharge for building material, especially for concrete
KR1019850009927A KR920010467B1 (en) 1984-12-28 1985-12-28 Apparatus for producing mixtures of cement
ZA859860A ZA859860B (en) 1984-12-28 1985-12-30 Mobile mixer,preferably having counterrotational emptycing,for building materials,in particular concrete
US07/060,990 US4730934A (en) 1984-12-28 1987-06-09 Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84116485A EP0185801A1 (en) 1984-12-28 1984-12-28 Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete

Publications (1)

Publication Number Publication Date
EP0185801A1 true EP0185801A1 (en) 1986-07-02

Family

ID=8192399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116485A Withdrawn EP0185801A1 (en) 1984-12-28 1984-12-28 Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete

Country Status (5)

Country Link
EP (1) EP0185801A1 (en)
JP (1) JPS61217214A (en)
DD (1) DD242596A5 (en)
DE (1) DE3583390D1 (en)
ZA (1) ZA859860B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001652A1 (en) * 1990-01-20 1991-08-01 Elba Werk Maschinen Gmbh & Co Mixed building material-transport equipment - has magnetic-card station controlling hatch lock and additive-metering devices
CN106003425A (en) * 2016-07-08 2016-10-12 杭州鑫鹿机械制造有限公司 Novel concrete transportation stirring cylinder
CN111748442A (en) * 2020-08-21 2020-10-09 山河醋业有限公司 Edible vinegar processing and stirring tank

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4843662B2 (en) * 2008-11-14 2011-12-21 株式会社冨士機 Rotating stirrer
JP2018062085A (en) * 2016-10-11 2018-04-19 株式会社Ｎｉｐｐｏ Mortar manufacturing method and manufacturing apparatus
KR102040078B1 (en) * 2017-12-19 2019-11-27 김명대 Rotating drum for regeneration device of waste ascon
JP6808251B2 (en) * 2019-03-18 2021-01-06 ドライミックス事業協同組合 Water supply equipment and ready-mixed concrete production kneading equipment for ready-mixed concrete production

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436959A (en) * 1946-06-17 1948-03-02 Galion Metallic Vault Co Vehicle transporting means
DE1054811B (en) * 1953-05-27 1959-04-09 Machf Spaans Nv Mechanical circulation mixer with an elongated, closed mixing trough
GB913724A (en) * 1960-02-26 1962-12-28 Saint Gobain An improved process and apparatus for carrying out mass polymerisation
US3138167A (en) * 1963-06-18 1964-06-23 Sprout Waldron & Co Inc Mixer for feeds and the like
DE2327172A1 (en) * 1973-05-28 1974-12-19 Gerhard Dipl Kfm Dr Hudelmaier DRUM MIXING MACHINE, IN PARTICULAR CONCRETE MIXING MACHINE
GB2002645A (en) * 1977-08-19 1979-02-28 Commerciale Agricola Spa Machine for mixing and distributing loose materials, such as animal feedstuffs
DE2949026A1 (en) * 1979-01-17 1980-07-24 Italiana Forme Acciaio Ready-mixed concrete lorry drum - has coaxial internal tube with spiral of opposite pitch to mixing spiral

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436959A (en) * 1946-06-17 1948-03-02 Galion Metallic Vault Co Vehicle transporting means
DE1054811B (en) * 1953-05-27 1959-04-09 Machf Spaans Nv Mechanical circulation mixer with an elongated, closed mixing trough
GB913724A (en) * 1960-02-26 1962-12-28 Saint Gobain An improved process and apparatus for carrying out mass polymerisation
US3138167A (en) * 1963-06-18 1964-06-23 Sprout Waldron & Co Inc Mixer for feeds and the like
DE2327172A1 (en) * 1973-05-28 1974-12-19 Gerhard Dipl Kfm Dr Hudelmaier DRUM MIXING MACHINE, IN PARTICULAR CONCRETE MIXING MACHINE
GB2002645A (en) * 1977-08-19 1979-02-28 Commerciale Agricola Spa Machine for mixing and distributing loose materials, such as animal feedstuffs
DE2949026A1 (en) * 1979-01-17 1980-07-24 Italiana Forme Acciaio Ready-mixed concrete lorry drum - has coaxial internal tube with spiral of opposite pitch to mixing spiral

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001652A1 (en) * 1990-01-20 1991-08-01 Elba Werk Maschinen Gmbh & Co Mixed building material-transport equipment - has magnetic-card station controlling hatch lock and additive-metering devices
CN106003425A (en) * 2016-07-08 2016-10-12 杭州鑫鹿机械制造有限公司 Novel concrete transportation stirring cylinder
CN111748442A (en) * 2020-08-21 2020-10-09 山河醋业有限公司 Edible vinegar processing and stirring tank

Also Published As

Publication number Publication date
DE3583390D1 (en) 1991-08-08
JPS61217214A (en) 1986-09-26
ZA859860B (en) 1987-11-25
DD242596A5 (en) 1987-02-04

Similar Documents

Publication Publication Date Title
EP0188674B1 (en) Transportable mixer, preferably having a reversed-running emptying facility for building materials, especially concrete
DE1927239A1 (en) Apparatus and method for mixing and pumping liquid explosive compositions
EP3582940B1 (en) Method for producing a concrete material
DE2039683A1 (en) Material conveyor device
EP0185801A1 (en) Transport mixer, preferably with counter-rotational emptying of building materials, particularly concrete
DE2331585A1 (en) Screw type pump for sludge material - has rotating paddle in filling hopper to prevent bridging of feed material
DE3906645A1 (en) Washing-out device for residual concrete
DE3012707C2 (en) Mixing mechanism for trough mixers
DE69705518T2 (en) MIXED VEHICLE
DE3611382A1 (en) METHOD AND DEVICE FOR PROVIDING CONCRETE BATCHES IN UNDERGROUND OPERATION
EP0523009B1 (en) Composting installation
EP2239120B1 (en) Transport vehicle for delivering a binder/aggregate mixture
DE1811445A1 (en) Concrete spraying machine, especially for underground mining
DE4219880C2 (en) Device for the continuous production and simultaneous delivery of a pumpable building material mixture, such as plastering mortar, containing water and hydraulically bindable solid in a homogeneous mixture
DE29517612U1 (en) Mixed transport device
EP0841137A2 (en) Installation and process for the production for mixing materials, in particular dry mortar
DE3307117C2 (en) Device for producing concentrated feed
DE3414365A1 (en) DEVICE FOR TREATING BITUMINOESE MIXED MATERIAL, IN PARTICULAR ROAD CONSTRUCTION ASPHALT
DE20009621U1 (en) Plant for the production of dry granulate binder products, in particular polystyrene granulate cement products
DE19635313C2 (en) Transport mixer with spiral discharge arrangement
DE2911774A1 (en) Compact machine for mixing PVC powder - having hot mixer mounted above cool mixer with common drive and direct discharge from hot machine into cooler
DE7716758U1 (en) DEVICE FOR COMPOSTING ORGANIC WASTE
DE2043608A1 (en) Pan mixer
DE2919826A1 (en) Mobile concrete rotary drum mixer - has water jet aimed at drum base between mixing tool and transport members
DE2728370A1 (en) MIXER

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870102

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHWING, GERHARD