WO2012101508A1 - Appareil à tambour rotatif, notamment bétonnière - Google Patents

Appareil à tambour rotatif, notamment bétonnière Download PDF

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Publication number
WO2012101508A1
WO2012101508A1 PCT/IB2012/000115 IB2012000115W WO2012101508A1 WO 2012101508 A1 WO2012101508 A1 WO 2012101508A1 IB 2012000115 W IB2012000115 W IB 2012000115W WO 2012101508 A1 WO2012101508 A1 WO 2012101508A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping means
rotary drum
drum
selectively
blocking device
Prior art date
Application number
PCT/IB2012/000115
Other languages
English (en)
Inventor
Renzo Salvadori
Original Assignee
Le Officine Riunite - Udine Spa
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 Le Officine Riunite - Udine Spa filed Critical Le Officine Riunite - Udine Spa
Priority to EP12707898.8A priority Critical patent/EP2667964B1/fr
Publication of WO2012101508A1 publication Critical patent/WO2012101508A1/fr

Links

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
    • B28C5/4262—Closures; Sealing mechanisms
    • 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
    • B28C5/4206—Control apparatus; Drive systems, e.g. coupled to the vehicle drive-system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/502—Vehicle-mounted mixing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/60—Safety arrangements

Definitions

  • the present invention concerns an apparatus with a rotary drum such as a concrete mixer, or a rotary drum used in concrete plants, or mounted on trailers, for the preparation, storage, transport and mixing of concrete; the apparatus is provided at least with a device suitable to selectively block the rotation of the drum, to allow maintenance operations for example.
  • a rotary drum such as a concrete mixer, or a rotary drum used in concrete plants, or mounted on trailers, for the preparation, storage, transport and mixing of concrete
  • the apparatus is provided at least with a device suitable to selectively block the rotation of the drum, to allow maintenance operations for example.
  • Concrete mixers comprising a rotary drum and one or more openings, usually two disposed in opposite positions of the drum, which are normally closed during work steps by a cover with a plurality of screws.
  • the blocking device comprises a fork element which is associated with a bearing structure of the drum and can be selectively positioned by the operator to bring it respectively into a first non-operating position, corresponding to the normal use of the concrete mixer, and into a second operating position, in which the fork element is placed in mechanical cooperation with an abutment block provided on the drum in order to prevent the rotation of the drum.
  • One limitation of the mechanical block is that the operator, because of his/her inexperience or negligence, can in any case enter into the drum without having deliberately activated the blocking device of the drum rotation, thus generating a dangerous situation where serious accidents can occur.
  • the mechanical block can be deactivated by an external operator, who may not be aware of the presence of an operator inside the drum, putting the safety of the latter into serious jeopardy, for example by activating the rotation of the drum. Or the drum could spontaneously start rotating because of gravity, or because of the operator himself, for example as he/she gets out of the drum.
  • Document JP 6 144104 describes a drum mixer for concrete mixers in which there are multiple access sections closed by a respective cover.
  • the cover has a clamping mechanism which is released by driving a key which is the same as that of the motor of the concrete mixer. When the key is used to open the cover, it cannot be removed from the keyhole until the cover is re-closed.
  • JP' 104 prevents putting the concrete mixer into motion when the cover is open, but it does not prevent accidental movements of the drum which can occur even with the motor off, for example caused by imbalances of the concrete residue present inside and/or by the operators who are working inside the drum.
  • the main purpose of JP' 104 is to prevent great leakages of fresh concrete from the drum, but it does not solve the problem of safety of the operators who are working inside the drum.
  • One purpose of the present invention is to obtain an apparatus with a rotary drum, such as a concrete mixer for example, which allows an operator to work inside the drum in absolute safety without the risk of the drum automatically starting rotating or of a second operator activating it from outside the drum.
  • a rotary drum such as a concrete mixer for example
  • Another purpose is to obtain a simple and economic apparatus, equipped with safety devices which are non-invasive during normal use and suitable to be used even in very dangerous work environments.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • the present invention concerns an apparatus, such as a concrete mixer, with a rotary drum provided at least with an opening able to be selectively opened/closed by a closing element to allow access inside, and in which first clamping means are provided, able to be selectively actuated by an operator to prevent the rotation of the rotary drum.
  • the closing element of the opening has second clamping means which block the removal thereof during normal use of the drum; the second closing means can be selectively released only in a condition where the said first clamping means are activated. In this way, the removal of the closing element, and therefore access to the inside of the drum, is possible only if the latter is blocked, in a sure way, in its rotation.
  • the first clamping means associated with the rotation of the drum comprise at least an actuation element in order to activate them, and in particular the actuation element can be selectively removed by mating housing means only when the first clamping means are activated.
  • the second clamping means, associated with the access opening of the drum can be selectively released only by using the actuation element, so that access to the inside of the drum is possible only when the rotation of the drum is blocked.
  • the actuation element can, for example, be a key which is variably configured or shaped and is suitable to couple, for example, with a mating seating or shaped protrusion-head of the first and the second clamping means in order to activate them.
  • the actuation element is conformed to remain solidly associated with the second clamping means when these are released. In this way, once the closing element has been removed, the actuation element cannot be taken from the closing element in order to subsequently deactivate the first clamping means and leave the drum free to rotate with the opening still open.
  • the first clamping means comprise at least a first blocking device which can be actuated by the actuation element and associated either with the rotary drum or with a fixed structure of the apparatus, in order to mechanically couple respectively either with the fixed structure or with the rotary drum and prevent the rotation of the latter.
  • the first blocking device can be, for example, a pin, a lock element, a hydraulic actuator, or interference elements which, when actuated, constrain the rotation of the drum.
  • the first clamping means comprise at least an abutment element, an anchoring device and the first blocking device.
  • the abutment element can be for example a block, a protrusion, a pin or similar, solidly associated with the rotary drum.
  • the abutment elements can be associated with a guide or rolling element, of the rotary drum, which is suitable to maintain the latter coaxial to its axis of rotation.
  • the anchoring device is solidly associated with the fixed structure, advantageously the support structure of the rotary drum, and is suitable to couple mechanically with the abutment element in order to prevent the rotation of the rotary drum.
  • the first blocking device which can be actuated by the actuation element, is suitable to keep the anchoring device coupled to the at least one abutment element, so that the rotation of the drum is not allowed until the actuation element provides to deactivate the first blocking device again.
  • the first clamping means comprise interception members associated with a hydraulic feed circuit of a hydraulic motor suitable to make the drum rotate.
  • the interception members are suitable to prevent the rotation of the hydraulic motor and can be selectively actuated by means of the actuation element, or in other forms of embodiment by means of electrical signals or frequency signals.
  • the interception members can be mechanical or servo commanded valves which intercept the work fluid for example between the delivery pipe and the exit from the motor so that the rotation of the hydraulic motor, and therefore of the rotary drum solidly associated therewith, is prevented.
  • the second clamping means comprise at least a second blocking device, able to be actuated by the actuation element and associated either with the rotary drum or with the closing element, to couple mechanically respectively either with the closing element or with the rotary drum and to prevent the removal of the closing element.
  • the second clamping means comprise a tightening element, associated either with the closing element or with the rotary drum, and conformed to couple solidly with the second blocking device associated respectively either with the rotary drum or with the closing element.
  • the actuation element is selectively associable with the second blocking device so as to de-couple the tightening element from the second blocking device
  • the closing element comprises a plurality of attachment means suitable to attach the closing element to the ⁇ opening, and the second clamping means are associated with at least one of the attachment means and are able to be selectively actuated by means of the actuation element.
  • the attachment means can be screws, shaped brackets or pins for example.
  • screws if screws are used, it can be provided that at least one of these is provided with a suitable shaped head, having the shape of the actuation element, and therefore it will be possible to remove the screw only by using said actuation element.
  • first clamping means and/or the second clamping means are chosen from a group comprising electric, magnetic, mechanical, electro-magnetic, electro-mechanical types or a combination thereof.
  • first clamping means and/or the second clamping means can be selectively activated/deactivated by transmitting electric signals, and/or frequency signals.
  • - fig. 1 is a lateral view of an apparatus with a rotary drum according to the present invention
  • - fig. 2 is a perspective view of a detail in fig. 1 ;
  • - fig. 3 is a first detail of fig. 2 in a first operating configuration
  • - fig. 4 is a second detail of fig. 1 in the first operating condition
  • - fig. 5 is a view of a first detail of fig. 3 in a second operating condition
  • - fig. 6 is a view of a second detail of fig. 4 in the second operating condition
  • - fig. 7 is a schematic representation of a feed circuit of the apparatus with a rotary drum of fig. 1 ;
  • - fig. 8 is a variant of fig. 7;
  • - fig. 9 is a variant of fig. 3;
  • - fig. 10 is another variant of fig. 7.
  • an apparatus with a rotary drum in this case a concrete mixer, is indicated in its entirety with the reference number 10 and comprises a truck 1 1 on which is disposed, between a front support structure 12 and a rear support structure 13, a rotary drum 15 which is suitable for preparing, mixing, transporting and temporarily storing the concrete inside it.
  • Drive members 16, which can be selectively controlled by a control unit 17, are associated with the drum 15, in proximity to the first support 12, in order to command the rotation of the drum 15.
  • the drum 1 5 is provided with openings 20, in this case two, made at diametrically opposite positions and closed by a closing element or cover 21.
  • Each opening 20 has sizes that allow an operator to be able to access inside the drum 15 and has a substantially elliptic shape even if, in other forms of embodiment, different shapes may be provided, such as rectangular, polygonal, circular or similar.
  • the opening 20 (figs. 4 and 6) is defined by a peripheral wall 22 which extends, in the case shown in the drawings, toward the inside of the drum 15, substantially orthogonal to the circumferential development surface of the latter, and by an abutment wall 23 disposed inside the drum and substantially orthogonal to the peripheral wall 22. In this way the cover 21 is prevented from protruding from the bulk defined by the drum 15 and from obstructing or hindering its rotation.
  • the cover 21 is provided, in a known way, with attachment means to attach it to the opening 20.
  • the attachment means comprise attachment screws 25 which are attached to the abutment wall 23 (fig. 6), but it is clear that other attachment solutions, such as rapid attachment means for example, could be provided.
  • hinging means are associated with the cover 21 , disposed peripherally to the opening 20 to allow the articulated connection of the cover 21 with the external body of the drum 15, and attachment means provide to close the cover 21 for the normal use of the concrete mixer 10.
  • the rear support structure 13 (fig. 2) comprises a frame 37 disposed substantially orthogonal with respect to the axis of rotation Z of the drum 15, on the opposite sides of which, in the case shown here, two supports 39 are disposed of the known type, suitable to allow the rotation of the drum 15 around the axis Z thereof. It is clear that in other forms of embodiment other supports can be provided, associated with the lower part of the drum 15 in order to support the whole load.
  • the drum 15 in its rear part, is also provided with a rolling ring 26 which cooperates with the supports 39 to maintain the drum 15 in axis.
  • the rolling ring 26 (fig. 2) comprises a first surface 27 and a second surface 28 which extend in a radial direction with respect to the circumferential surface of the drum 15.
  • first clamping means 40 to block the rotation of the drum 15, which respectively comprise a first 31 and a second 32 block which are solidly attached on the first surface 27 of the rolling ring 26.
  • an anchoring device 41 which is attached to the rear part of the frame 37 and a first blocking device 38 suitable to block the position assumed by the anchoring device 41 .
  • first and second block 3 1 and 32 are substantially parallelepiped in shape, even if, in different forms of embodiment, the shape could be different, for example rounded, and are attached to the rolling ring 26 in diametrically opposite positions so that, when they are aligned in the vertical direction, one of the openings 20 is in an easily accessible position for the operators.
  • one of the openings 20 is at a height comprised between 20 cm and 50 cm, advantageously at 35 cm, with respect to the platform of the truck 1 1.
  • the anchoring device 41 (figs. 3 and 5) comprises a support bracket 36, provided with two pintles 42 around which a fork element 35 is mounted, partly rotatable.
  • the fork element 35 comprises a pin 43 pivoted in seatings 45 made on the pintles 42, an anchoring plate 46 and a command lever 47.
  • the anchoring plate 46 is provided with a cavity 50, substantially conformed to the cross section of the first 3 1 and second block 32 and which in use couples mechanically with one of them, in this case with the first block 3 1 .
  • the command lever 47 is able to be selectively actuated by an operator to make the anchoring plate 46 rotate around the pin 43 and determine the coupling, or respectively the release, of the anchoring plate 46 with/from the first or second block 3 1 or 32.
  • the command lever 47 and the anchoring plate 46 are solidly associated with each other by means of a tubular body 5 1 which is hinged on the pin 43, and are disposed at angles to each other.
  • the first clamping device 38 comprises an interference pin 52, selectively positionable in a first inactive position in which it is partly withdrawn inside it, (fig. 3), and a second active position (fig. 5) in which it protrudes toward the outside and couples mechanically with an interference seating 55 made in the tubular body 51 , that is, so as to prevent the rotation of the fork element 35 around the pin 43.
  • the interference seating 55 is made on the tubular body 5 1 in a position such that, when the cavity 50 of the anchoring plate 46 grips either the first or second block 3 1 and 32, the interference pin 52 can be coupled with it.
  • the interference pin 52 is activated by means of one or more keys 56, in this case two, which during the normal working steps remain clamped in suitable holes 57 of the first blocking device 38.
  • the keys 56 remain solidly associated with the blocking device 38 until the interference pin 52 is completely inserted inside the interference seating 55, given that otherwise the tubular body 51 would prevent the complete emergence thereof.
  • a catch 59 is also associated with the support bracket 36, and is suitable to clamp the command lever 47 to keep the anchoring plate 46 in a non-coupled position with the blocks 3 1 or 32.
  • two bars 30 are associated, for example by welding, to the first surface 27 of the rolling ring 26.
  • the bars 30 are substantially semi-circular in shape and are disposed in opposite positions with respect to the first 3 1 and second 32 block.
  • the two bars 30 are located substantially orthogonal to the first surface 27 and together define, near to the respective terminal ends of the two bars 30, a circumference interrupted by respective two or more interruptions 33, near which the blocks 3 1 and 32 are attached.
  • the first clamping means 40 may comprise only the blocking device 38, which is attached directly to the frame 37 of the rear support structure 13.
  • the two bars 30 of the rolling ring 26 are substantially continuous to define a circumference and that, in diametrically opposite positions, two or more coupling seatings are made in which, when it is necessary to activate the first clamping means 40 to block the rotation of the drum 15, the interference pin 52 of the first blocking device 38 is mechanically coupled.
  • Second clamping means 60 are associated with each cover 21 (figs. 4 and 6) and each opening 20, and comprise a second blocking device 61 attached in an attachment seating 62 made near the opening 20, and a bolt 63 sliding in a support 65.
  • the bolt 63 (fig. 4) is solidly coupled with the second blocking device 61 to prevent it from opening, and the attachment screws 25 are screwed in to guarantee the seal.
  • the first clamping means 40 If access inside the drum 15 is required, it is necessary to activate the first clamping means 40, from which, once they are activated, it is possible to remove the two keys 56 and, inserting one of them inside a corresponding shaped hole 66 present in the second blocking device 61 , it is possible to remove the bolt 63 from the latter and allow the cover 21 to be removed (fig. 6).
  • the two keys 56 associated with the first clamping means 40 are shaped differently from each other: one is associable with a corresponding second blocking device 61 present in one of the two openings 20 and the other key 56 is associable with the other opening 20.
  • the second clamping means 60 comprise only the second blocking device 61 which is conformed like the first blocking device 40 as described above, or it has the interference pin 52 which is attached to the cover 21 and is suitable to couple mechanically with a coupling seating that is made on a bracket solidly attached to the external surface of the drum 15. In the condition where the second clamping means 60 are active, the interference pin 57 of the second blocking device 61 is mechanically coupled with the coupling seating of the bracket.
  • the drive members 16 (fig. 7) comprise a hydraulic motor 70, of the volumetric and invertible type, associated with the drum 15 by reduction members 71 and made to rotate, in known modes, by means of a hydraulic circuit 72, substantially known and comprising at least a hydraulic pump.
  • the hydraulic motor 70 is connected to the hydraulic circuit 72 by means of hydraulic pipes 73.
  • First clamping means 140 comprise respectively a first interception valve 75 and a second interception valve 76, each of which is selectively actuated by means of a respective blocking device 138.
  • a key 156 is solidly associated with each blocking device 138, and allows to open/close the respective interception valve 75 and 76.
  • the drum 15, as described above, is provided with two opposite openings 20 closed by a cover 21 , which comprises second clamping means 160 suitable to impede its opening if they are not properly activated.
  • the cover 21 as described above, is provided with a plurality of attachment screws 25, two of which, in this case disposed in opposite positions, comprise a second blocking device 161 of the second clamping means 160.
  • Each of the two blocking devices 161 is provided with a shaped hole 166 suitable to allow the keys 156 to be inserted, which are removed from the interception valves 75 and 76 when the latter are closed.
  • the first clamping means 340 comprise an interference element or chock 384, which is conformed substantially to the shape of the drum 15, is associated with the frame 37 and is actuated by a hydraulic actuator 385 to be taken to a first position of interference against the drum 15 and to block its rotation, and a second inactive position where rotation is allowed.
  • the hydraulic actuator 385 is commanded by the same oil-dynamic circuit 72 that drives the drive members 16 to rotate the drum 15, and in particular the drive of the oil-dynamic circuit 72 occurs by actuating a key 356 directly associated with it, for example near a command console.
  • the dis-activation of the oil-dynamic circuit 72 drives the hydraulic actuator 385, taking the chock 384 into a condition of interference with the drum 15, to block the rotation thereof.
  • the key 356 may subsequently be associated with second clamping means which are associated with the cover 21 or the drum 15 and which are suitable to prevent the removal of the cover 21 when the drum is not constrained in rotation.
  • drum 15 may be clamped in any angular position whatsoever without needing to position it near mating clamping means.
  • a mechanical or hydraulic blocking of the rotation of the drum 15 instead of providing a mechanical or hydraulic blocking of the rotation of the drum 15, it may be provided that the blocking is of an electric/magnetic type.
  • the command unit 17 of the concrete mixer 10 is provided with a switch 281 able to be selectively activated by an external operator and with a transmitter 282 suitable to send electric signals when the switch 281 is actuated.
  • the hydraulic pipes 73 are connected to the hydraulic circuit 72, they connect to the hydraulic motor 70 and are provided with interception valves 275 and 276 of the electromechanical type, and suitable to receive an electric signal or a frequency signal.
  • a blocking device 283 of the electromechanical type is associated with the cover 21 which, in normal use, is provided with mechanical means that prevent the cover from opening.
  • the blocking device 283 also comprises a signals receiver suitable to receive signals and to dis-activate the mechanical means.
  • the switch 281 When it is necessary to enter inside the drum 15, the switch 281 is activated and by means of the transmitter 282 a signal is sent both to the interception valves 275, 276 and also to the blocking device 283, respectively to block the rotation of the hydraulic motor 70 and to dis-activate the blocking device 283 of the cover 21.
  • the interception valves 275 and 276 will not be opened until the cover 21 is put to cover the opening 20 and the blocking device 283 has sent a signal to the central command unit 280 to confirm this condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

L'invention concerne un appareil à tambour rotatif (15), notamment une bétonnière, muni d'au moins une ouverture (20) susceptible d'être sélectivement ouverte / fermée par un élément (21) d'ouverture pour donner accès à l'intérieur du tambour (15), et où sont installés des premiers moyens (40; 140; 275, 276; 340) de serrage, susceptibles d'être sélectivement activés pour empêcher la rotation dudit tambour rotatif (15). Des deuxièmes moyens (60; 160; 283) de serrage sont associés à l'élément (21) d'ouverture de l'ouverture (20), aptes à bloquer, en cours d'utilisation normale, le retrait de l'élément (21) d'ouverture et susceptibles d'être sélectivement débrayés uniquement dans un état où les premiers moyens (40; 140; 275, 276; 340) de serrage sont activés.
PCT/IB2012/000115 2011-01-27 2012-01-26 Appareil à tambour rotatif, notamment bétonnière WO2012101508A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12707898.8A EP2667964B1 (fr) 2011-01-27 2012-01-26 Appareil à tambour rotatif, notamment bétonnière

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD2011A000009 2011-01-27
ITUD2011A000009A IT1403829B1 (it) 2011-01-27 2011-01-27 Apparecchiatura con tamburo rotante, quale una autobetoniera

Publications (1)

Publication Number Publication Date
WO2012101508A1 true WO2012101508A1 (fr) 2012-08-02

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Application Number Title Priority Date Filing Date
PCT/IB2012/000115 WO2012101508A1 (fr) 2011-01-27 2012-01-26 Appareil à tambour rotatif, notamment bétonnière

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EP (1) EP2667964B1 (fr)
IT (1) IT1403829B1 (fr)
WO (1) WO2012101508A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020155896A1 (fr) * 2019-01-29 2020-08-06 烟台盛利达工程技术有限公司 Système rotatif intégré de fermeture étanche

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06144104A (ja) 1992-11-16 1994-05-24 Sogo Concrete Service:Kk コンクリートミキサー車におけるミキサドラム
FR2754485A1 (fr) * 1996-10-15 1998-04-17 Cifa Spa Dispositif de securite pour verrouiller le tambour de betonnieres portees sur camion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2901170B1 (fr) * 2006-05-18 2008-07-18 Couvrot Sa Porte, apte a fermer une ouverture d'un compartiment interne integrant au moins l'organe mobile notamment moteur, et potentiellement dangereux.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06144104A (ja) 1992-11-16 1994-05-24 Sogo Concrete Service:Kk コンクリートミキサー車におけるミキサドラム
FR2754485A1 (fr) * 1996-10-15 1998-04-17 Cifa Spa Dispositif de securite pour verrouiller le tambour de betonnieres portees sur camion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020155896A1 (fr) * 2019-01-29 2020-08-06 烟台盛利达工程技术有限公司 Système rotatif intégré de fermeture étanche

Also Published As

Publication number Publication date
EP2667964A1 (fr) 2013-12-04
IT1403829B1 (it) 2013-10-31
EP2667964B1 (fr) 2014-10-08
ITUD20110009A1 (it) 2012-07-28

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