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EP0608191A1 - Concrete mixer with high pressure washing device - Google Patents

Concrete mixer with high pressure washing device Download PDF

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Publication number
EP0608191A1
EP0608191A1 EP94440005A EP94440005A EP0608191A1 EP 0608191 A1 EP0608191 A1 EP 0608191A1 EP 94440005 A EP94440005 A EP 94440005A EP 94440005 A EP94440005 A EP 94440005A EP 0608191 A1 EP0608191 A1 EP 0608191A1
Authority
EP
European Patent Office
Prior art keywords
movable arm
rotation
tank
axis
mixer according
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.)
Ceased
Application number
EP94440005A
Other languages
German (de)
French (fr)
Inventor
Albert Bingler
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.)
MEBI PRODUCTION S.A.
Original Assignee
MEBI PRODUCTION SA
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 MEBI PRODUCTION SA filed Critical MEBI PRODUCTION SA
Publication of EP0608191A1 publication Critical patent/EP0608191A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0936—Cleaning containers, e.g. tanks by the force of jets or sprays using rotating jets
    • 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
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air

Definitions

  • the present invention relates to a concrete mixer provided with a high pressure washing device, the mixer comprising a stationary tank and a rotor arranged to rotate in the tank, and the washing device comprising at least one movable arm provided with nozzles and arranged to perform a rotary movement in the tank, and supply conduits connecting the spray nozzles to a stationary source of high pressure cleaning liquid which is outside the tank.
  • the inside of the tank of concrete mixers must be cleaned periodically, at least at the end of a manufacturing step, because the remains of cement or concrete adhere very strongly to the walls of the tank and to the elements of the rotor if lets them harden.
  • the projection of water jets under a high pressure of 100 to 150 bars (10 to 15 MPa) constitutes a convenient, effective and inexpensive cleaning means. This can be done manually using high pressure lances which are introduced into the mixer through an inspection door.
  • such a method does not always allow adequate treatment of all the surfaces of the tank and the rotor, especially in large mixers, and moreover the handling of these lances is not without danger. This is why we are trying to mechanize this process.
  • Certain mixers are known having horizontal rotors and lateral ramps of high-pressure nozzles which can clean the rotors by virtue of their rotation.
  • a similar device comprising high-pressure nozzles on a fixed circular ramp, was provided in a mixer with vertical axis.
  • these devices cannot uniformly clean all of the interior surfaces of the tank.
  • a washing device In mixers having a central rotor with vertical axis, a washing device is known, formed by projection nozzles mounted on arms which are integral with the rotor, so that the nozzles and the pipes distributing the water to them rotate with the rotor in all circumstances.
  • This requires a central supply duct fitted with a rotating joint.
  • this rotary joint constitutes a weak point which requires limiting the pressure to a value of the order of 60 to 70 bars (6 to 7 MPa), which restricts the effectiveness of the washing device.
  • the subject of the present invention is a concrete mixer equipped with a washing device capable of projecting a liquid onto all the desired surfaces inside the mixer tank, with a high pressure supply of at least 100 bars. (10 MPa), avoiding the use of a rotating joint on the high pressure supply lines.
  • This washing device must also allow the automatic cleaning of the concrete mixer without opening its cover and without manual intervention, this cleaning being controlled by an operator from a control room, which guarantees total safety of use.
  • the invention relates to a concrete mixer of the kind indicated above, characterized in that said supply conduits comprise a flexible hose at high pressure between a stationary connection, connected to said source of liquid, and a movable connection which is connected to the projection nozzles and follows the rotary movement of the movable arm, this rotary movement being a reciprocating movement over a limited angle around an axis of rotation.
  • the movable arm is independent of the rotor and does not need to make more than one revolution to reach all the areas of the interior of the tank. This rotation can even be limited to a fraction of a turn if the mobile arm has two branches or if there are several mobile arms arranged in a star.
  • the flexible hose allows a supply with washing liquid at any high pressure and without risk of leakage, thanks to the elimination of the rotary joint provided in the prior art.
  • the flexible pipe has a spiral shape, the movable connection being closer to the axis of rotation than the stationary connection.
  • said axis of rotation is vertical and coincides with the axis of the rotor, and the movable arm is located above the rotor.
  • the rotor is mounted on a fixed support secured to a bottom of the tank and the movable arm is mounted in a bearing supported by an upper cover of the tank.
  • the movable arm is supported by an axial tube mounted in the rotation bearing and constituting a section of supply conduit, and drive means are coupled to the axial tube at the outside of the tank, to produce the rotary movement of the movable arm.
  • Said axial tube can be rigidly connected to the mobile connector by means of a section of radial tube supporting the mobile connector at a distance from the axis of rotation.
  • the drive means may include a fluid pressure cylinder, the stroke of which determines the angle of rotation of the movable arm.
  • the movable arm preferably comprises two branches extending substantially symmetrically with respect to the axis of rotation.
  • the angle of rotation of the movable arm can be less than or equal to 360 °.
  • the angle of rotation of the movable arm is slightly greater than 180 °.
  • the mixer shown in Figures 1 and 2 is a mixer of known type with vertical axis, comprising a cylindrical tank 1 in which a rotor 2 rotates comprising arms 3, 4 provided with blades 5, 6 which stir the concrete by circulating along from the flat bottom 7 of the tank.
  • the rotor 2 is supported by a central support 8 which passes through the bottom 7 and which encloses the drive members.
  • the tank 1 is closed by a cover 9, certain elements of which are mounted on hinges to form one or more liftable covers, as indicated by the reference 10 in FIG. 1.
  • the cover 9 has been deleted in order to clarify the drawing.
  • the mixer is equipped with the usual loading, emptying and control members, which are not shown.
  • a rotary arm 11 with two identical branches 12 and 13, equipped with projection nozzles 14 which are directed into different directions in order to reach all surfaces to be cleaned.
  • the arm 11 is constituted by a tube serving as a supply pipe for the nozzles. It is supported by a vertical central tube 15 rotatably mounted around an axis 16 which coincides with the axis of the rotor 2, in a central bearing 17 supported by the cover 9.
  • the inner conduit of the tube 15 is connected to that of the arm 11 to also serve as a supply conduit.
  • the movable connector 20 is connected to a fixed connector 21 by means of a high pressure flexible pipe 22 which, in the example shown above, has the shape of a spiral extending over a little less than two laps. Hoses of this kind are well known in hydraulic transmission devices and are capable of withstanding pressures greater than 150 bars.
  • the connector 21 is connected to a source of water under high pressure 23 by means of a fixed supply conduit 24 (drawn diagrammatically in FIG. 1) and control means not shown, which are actuated at will to produce violent jets of water 25 at the outlet of the nozzles 14.
  • the rotary movement of the arm 11 is a reciprocating movement covering an angle A between two positions which are shown in FIG. 2, namely a rest position of the arm 11, drawn in solid lines, and an end position 11 'race drawn in mixed lines.
  • the angle A is slightly greater than 180 ° in order to guarantee that all the oblique surfaces are reached by the jets 25.
  • the angle A is approximately 210 °.
  • the rotary movement of the arm is obtained by means of a double-acting hydraulic cylinder 26, the piston rod of which comprises a rack 27 driving a pinion 28 integral with the axial tube 15. In this way, it is the stroke of the cylinder 26 which determines the angle of rotation A.
  • any other equivalent training means could be used.
  • the high-pressure washing device is completely independent of the rotor 2 and is located above the zone occupied by it and by the concrete in the tank 1.
  • the nozzles 14 can be arranged in the most effective so that the jets reach any surface in the tank.
  • the high pressure supply by means of the flexible hose 22 offers excellent guarantees against leakage safety and ensures a long service life. Its spiral shape prevents twisting of the pipe.
  • This washing device also allows cleaning without manual intervention which eliminates all the risks associated with such intervention. In addition, cleaning can be controlled remotely by an operator located in a control room. It can also be carried out according to automatic cleaning cycles.
  • the present invention is not limited to the embodiment described above, but extends to any modification or variant obvious to a person skilled in the art.
  • the water supply to the movable arm 11 can take place otherwise than through the axial tube 15, for example by means of an eccentric tube passing outside the bearing 17, through a semicircular slot in the cover. 9, and carrying the movable connector 20.
  • a washing device similar to that of the example described can be provided in a mixer with horizontal axis, insofar as the movable arm can occupy a rest position where it is not reached by the mixed concrete.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cleaning In General (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The concrete mixer according to the invention is provided with a high-pressure washing device for detaching concrete and cement residue from the surface of the drum (1) and of the rotor (2) by means of water-spraying nozzles (14) which are borne and supplied by a moving arm (11). The washing device does not have a rotating seal, so that it can operate at high pressures of 100 to 150 bar. The moving arm (11) is located above the rotor (2), of which it is independent. It effects a rotary movement through a limited angle, slightly greater than 180@. It receives water under high pressure through a hose (22), which is preferably in the shape of a spiral. The invention applies to horizontal-axis or vertical-axis concrete mixers. <IMAGE>

Description

La présente invention concerne un malaxeur à béton pourvu d'un dispositif de lavage à haute pression, le malaxeur comportant une cuve stationnaire et un rotor agencé pour tourner dans la cuve, et le dispositif de lavage comportant au moins un bras mobile, pourvu de buses de projection et agencé pour effectuer un mouvement rotatif dans la cuve, et des conduits d'alimentation reliant les buses de projection à une source stationnaire de liquide de nettoyage à haute pression qui se trouve à l'extérieur de la cuve.The present invention relates to a concrete mixer provided with a high pressure washing device, the mixer comprising a stationary tank and a rotor arranged to rotate in the tank, and the washing device comprising at least one movable arm provided with nozzles and arranged to perform a rotary movement in the tank, and supply conduits connecting the spray nozzles to a stationary source of high pressure cleaning liquid which is outside the tank.

L'intérieur de la cuve des malaxeurs à béton doit être nettoyé périodiquement, au moins à la fin d'une étape de fabrication, car les restes de ciment ou de béton adhèrent très fortement aux parois de la cuve et aux éléments du rotor si on les laisse durcir. A cet effet, la projection de jets d'eau sous une haute pression de 100 à 150 bars (10 à 15 MPa) constitue un moyen de nettoyage commode, efficace et peu coûteux. On peut le faire manuellement à l'aide de lances à haute pression qu'on introduit dans le malaxeur par une porte de visite. Cependant, un tel procédé ne permet pas toujours de traiter convenablement toutes les surfaces de la cuve et du rotor, surtout dans les grands malaxeurs, et de plus le maniement de ces lances n'est pas sans danger. C'est pourquoi on cherche à mécaniser ce procédé.The inside of the tank of concrete mixers must be cleaned periodically, at least at the end of a manufacturing step, because the remains of cement or concrete adhere very strongly to the walls of the tank and to the elements of the rotor if lets them harden. For this purpose, the projection of water jets under a high pressure of 100 to 150 bars (10 to 15 MPa) constitutes a convenient, effective and inexpensive cleaning means. This can be done manually using high pressure lances which are introduced into the mixer through an inspection door. However, such a method does not always allow adequate treatment of all the surfaces of the tank and the rotor, especially in large mixers, and moreover the handling of these lances is not without danger. This is why we are trying to mechanize this process.

On connaît certains malaxeurs ayant des rotors horizontaux et des rampes latérales de buses à haute pression qui peuvent nettoyer les rotors grâce à la rotation de ceux-ci. Un dispositif analogue, comportant des buses à haute pression sur une rampe circulaire fixe, a été prévu dans un malaxeurà axe vertical. Toutefois ces dispositifs ne peuvent pas nettoyer uniformément l'ensemble des surfaces intérieures de la cuve.Certain mixers are known having horizontal rotors and lateral ramps of high-pressure nozzles which can clean the rotors by virtue of their rotation. A similar device, comprising high-pressure nozzles on a fixed circular ramp, was provided in a mixer with vertical axis. However, these devices cannot uniformly clean all of the interior surfaces of the tank.

Dans les malaxeurs ayant un rotor central à axe vertical, on connaît un dispositif de lavage formé de buses de projection montées sur des bras qui sont solidaires du rotor, de sorte que les buses et les tuyaux leur distribuant l'eau tournent avec le rotor en toutes circonstances. Cela nécessite un conduit d'alimentation central équipé d'un joint tournant. Or ce joint tournant constitue un point faible qui impose de limiter la pression à une valeur de l'ordre de 60 à 70 bars (6 à 7 MPa), ce qui restreint l'efficacité du dispositif de lavage.In mixers having a central rotor with vertical axis, a washing device is known, formed by projection nozzles mounted on arms which are integral with the rotor, so that the nozzles and the pipes distributing the water to them rotate with the rotor in all circumstances. This requires a central supply duct fitted with a rotating joint. However, this rotary joint constitutes a weak point which requires limiting the pressure to a value of the order of 60 to 70 bars (6 to 7 MPa), which restricts the effectiveness of the washing device.

La présente invention a pour objet un malaxeur à béton équipé d'un dispositif de lavage capable de projeter un liquide sur toutes les surfaces voulues à l'intérieur de la cuve du malaxeur, avec une alimentation sous une haute pression d'au moins 100 bars (10 MPa), en évitant l'utilisation d'un joint tournant sur les conduites d'alimentation à haute pression. Ce dispositif de lavage doit en outre permettre le nettoyage automatique du malaxeur à béton sans ouverture de son couvercle et sans intervention manuelle, ce nettoyage étant commandé par un opérateur depuis une salle de commande, ce qui garantit une sécurité d'utilisation totale.The subject of the present invention is a concrete mixer equipped with a washing device capable of projecting a liquid onto all the desired surfaces inside the mixer tank, with a high pressure supply of at least 100 bars. (10 MPa), avoiding the use of a rotating joint on the high pressure supply lines. This washing device must also allow the automatic cleaning of the concrete mixer without opening its cover and without manual intervention, this cleaning being controlled by an operator from a control room, which guarantees total safety of use.

Dans ce but, l'invention concerne un malaxeur à béton du genre indiqué plus haut, caractérisé en ce que lesdits conduits d'alimentation comportent un tuyau flexible à haute pression entre un raccord stationnaire, raccordé à ladite source de liquide, et un raccord mobile qui est raccordé aux buses de projection et suit le mouvement rotatif du bras mobile, ce mouvement rotatif étant un mouvement en va-et-vient sur un angle limité autour d'un axe de rotation.For this purpose, the invention relates to a concrete mixer of the kind indicated above, characterized in that said supply conduits comprise a flexible hose at high pressure between a stationary connection, connected to said source of liquid, and a movable connection which is connected to the projection nozzles and follows the rotary movement of the movable arm, this rotary movement being a reciprocating movement over a limited angle around an axis of rotation.

De la sorte, le bras mobile est indépendant du rotor et n'a pas besoin d'effectuer plus d'un tour pour at- teindre toutes les zones de l'intérieur de la cuve. Cette rotation peut même être limitée à une fraction de tour si le bras mobile a deux branches ou s'il y a plusieurs bras mobiles disposés en étoile. Le tuyau flexible permet une alimentation avec un liquide de lavage à n'importe quelle haute pression et sans risque de fuite, grâce à la suppression du joint tournant prévu dans l'art antérieur.In this way, the movable arm is independent of the rotor and does not need to make more than one revolution to reach all the areas of the interior of the tank. This rotation can even be limited to a fraction of a turn if the mobile arm has two branches or if there are several mobile arms arranged in a star. The flexible hose allows a supply with washing liquid at any high pressure and without risk of leakage, thanks to the elimination of the rotary joint provided in the prior art.

De préférence, le tuyau flexible a une forme en spirale, le raccord mobile étant plus proche de l'axe de rotation que le raccord stationnaire.Preferably, the flexible pipe has a spiral shape, the movable connection being closer to the axis of rotation than the stationary connection.

Dans l'application préférée à un malaxeur à axe vertical, ledit axe de rotation est vertical et coïncide avec l'axe du rotor, et le bras mobile se trouve au-dessus du rotor. De préférence, le rotor est monté sur un support fixe solidaire d'un fond de la cuve et le bras mobile est monté dans un palier supporté par un capot supérieur de la cuve.In the preferred application to a mixer with a vertical axis, said axis of rotation is vertical and coincides with the axis of the rotor, and the movable arm is located above the rotor. Preferably, the rotor is mounted on a fixed support secured to a bottom of the tank and the movable arm is mounted in a bearing supported by an upper cover of the tank.

Dans une forme de réalisation préférée du dispositif de lavage, le bras mobile est supporté par un tube axial monté dans le palier de rotation et constituant un tronçon de conduit d'alimentation, et des moyens d'entraînement sont couplés au tube axial à l'extérieur de la cuve, pour produire le mouvement rotatif du bras mobile. Ledit tube axial peut être raccordé rigidement au raccord mobile au moyen d'un tronçon de tube radial supportant le raccord mobile à distance de l'axe de rotation. Les moyens d'entraînement peuvent comporter un vérin à pression de fluide, dont la course détermine l'angle de rotation du bras mobile.In a preferred embodiment of the washing device, the movable arm is supported by an axial tube mounted in the rotation bearing and constituting a section of supply conduit, and drive means are coupled to the axial tube at the outside of the tank, to produce the rotary movement of the movable arm. Said axial tube can be rigidly connected to the mobile connector by means of a section of radial tube supporting the mobile connector at a distance from the axis of rotation. The drive means may include a fluid pressure cylinder, the stroke of which determines the angle of rotation of the movable arm.

Le bras mobile comporte de préférence deux branches s' étendant sensiblement symétriquement par rapport à l'axe de rotation. L'angle de rotation du bras mobile peut être inférieur ou égal à 360°. De préférence, l'angle de rotation du bras mobile est légèrement supérieur à 180°.The movable arm preferably comprises two branches extending substantially symmetrically with respect to the axis of rotation. The angle of rotation of the movable arm can be less than or equal to 360 °. Preferably, the angle of rotation of the movable arm is slightly greater than 180 °.

D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description suivante d'un exemple de réalisation, en référence au dessin annexé, dans lequel :

  • - la figure 1 est une vue schématique en coupe verticale partielle d'un malaxeur à béton selon l'invention, équipé d'un dispositif de lavage à haute pression, et
  • - la figure 2 est une vue schématique en plan du dispositif de lavage.
Other characteristics and advantages of the present invention will appear in the following description of an exemplary embodiment, with reference to the appended drawing, in which:
  • FIG. 1 is a schematic view in partial vertical section of a concrete mixer according to the invention, equipped with a high-pressure washing device, and
  • - Figure 2 is a schematic plan view of the washing device.

Le malaxeur représenté dans les figures 1 et 2 est un malaxeur de type connu à axe vertical, comportant une cuve cylindrique 1 dans laquelle tourne un rotor 2 comportant des bras 3, 4 pourvus de pales 5, 6 qui brassent le béton en circulant le long du fond plat 7 de la cuve. Le rotor 2 est supporté par un support central 8 qui passe à travers le fond 7 et qui renferme les organes d'entraînement. La cuve 1 est obturée par un capot 9 dont certains éléments sont montés sur des charnières pour former un ou plusieurs couvercles relevables, comme indiqué par la référence 10 dans la figure 1. Dans la figure 2, le capot 9 a été supprimé afin de clarifier le dessin. Par ailleurs, le malaxeur est équipé des organes usuels de chargement, de vidange et de commande, qui ne sont pas représentés.The mixer shown in Figures 1 and 2 is a mixer of known type with vertical axis, comprising a cylindrical tank 1 in which a rotor 2 rotates comprising arms 3, 4 provided with blades 5, 6 which stir the concrete by circulating along from the flat bottom 7 of the tank. The rotor 2 is supported by a central support 8 which passes through the bottom 7 and which encloses the drive members. The tank 1 is closed by a cover 9, certain elements of which are mounted on hinges to form one or more liftable covers, as indicated by the reference 10 in FIG. 1. In FIG. 2, the cover 9 has been deleted in order to clarify the drawing. Furthermore, the mixer is equipped with the usual loading, emptying and control members, which are not shown.

Pour laver l'intérieur de la cuve 1 et le rotor 2 au moyen de jets d'eau à haute pression, il est prévu un bras rotatif 11 à deux branches identiques 12 et 13, équipées de buses de projection 14 qui sont dirigées dans différentes directions afin d'atteindre toutes les surfaces à nettoyer. Le bras 11 est constitué par un tube servant de conduit d'alimentation des buses. Il est supporté par un tube central vertical 15 monté de manière rotative autour d'un axe 16 qui coïncide avec l'axe du rotor 2, dans un paliercentral 17 supporté par le capot 9. Le conduit intérieur du tube 15 est raccordé à celui du bras 11 pour servir également de conduit d'alimentation. Son extrémité supérieure comporte un coude 18 raccordé à un tronçon de tube radial 19 pourvu d'un raccord 20 à une certaine distance de l'axe 16, de sorte que le raccord 20 décrit un arc de cercle horizontal quand le bras 11 tourne autour de l'axe 16. Le raccord mobile 20 est relié à un raccord fixe 21 au moyen d'un tuyau flexible à haute pression 22 qui, dans l'exemple représenté ci-dessus, a la forme d'une spirale s'étendant sur un peu moins de deux tours. Les tuyaux de ce genre sont bien connus dans les dispositifs de transmission hydraulique et sont capables de supporter des pressions supérieures à 150 bars. Le raccord 21 est relié à une source d'eau sous haute pression 23 au moyen d'un conduit fixe d'alimentation 24 (dessiné schématiquement dans la figure 1) et de moyens de commande non représentés, qu'on actionne à volonté pour produire de violents jets d'eau 25 à la sortie des buses 14.To wash the inside of the tank 1 and the rotor 2 by means of high pressure water jets, there is provided a rotary arm 11 with two identical branches 12 and 13, equipped with projection nozzles 14 which are directed into different directions in order to reach all surfaces to be cleaned. The arm 11 is constituted by a tube serving as a supply pipe for the nozzles. It is supported by a vertical central tube 15 rotatably mounted around an axis 16 which coincides with the axis of the rotor 2, in a central bearing 17 supported by the cover 9. The inner conduit of the tube 15 is connected to that of the arm 11 to also serve as a supply conduit. Its upper end comprises a bend 18 connected to a section of radial tube 19 provided with a connector 20 at a certain distance from the axis 16, so that the connector 20 describes a horizontal arc when the arm 11 rotates around the axis 16. The movable connector 20 is connected to a fixed connector 21 by means of a high pressure flexible pipe 22 which, in the example shown above, has the shape of a spiral extending over a little less than two laps. Hoses of this kind are well known in hydraulic transmission devices and are capable of withstanding pressures greater than 150 bars. The connector 21 is connected to a source of water under high pressure 23 by means of a fixed supply conduit 24 (drawn diagrammatically in FIG. 1) and control means not shown, which are actuated at will to produce violent jets of water 25 at the outlet of the nozzles 14.

Le mouvement rotatif du bras 11 est un mouvement de va-et-vient couvrant un angle A entre deux positions qui sont représentées dans la figure 2, à savoir une position de repos du bras 11, dessinée en traits continus, et une position de fin de course 11' dessinée en traits mixtes. De préférence, l'angle A est légèrement supérieur à 180° afin de garantir que toutes les surfaces obliques soient atteintes par les jets 25. Dans cet exemple, l'angle A vaut approximativement 210°. Le mouvement rotatif du bras est obtenu au moyen d'un vérin hydraulique 26 à double effet, dont la tige de piston comporte une crémaillère 27 attaquant un pignon 28 solidaire du tube axial 15. De cette façon, c'est la course du vérin 26 qui détermine l'angle de rotation A. Cependant, on pourrait utiliser n'importe quel autre moyen d' entraînement équivalent.The rotary movement of the arm 11 is a reciprocating movement covering an angle A between two positions which are shown in FIG. 2, namely a rest position of the arm 11, drawn in solid lines, and an end position 11 'race drawn in mixed lines. Preferably, the angle A is slightly greater than 180 ° in order to guarantee that all the oblique surfaces are reached by the jets 25. In this example, the angle A is approximately 210 °. The rotary movement of the arm is obtained by means of a double-acting hydraulic cylinder 26, the piston rod of which comprises a rack 27 driving a pinion 28 integral with the axial tube 15. In this way, it is the stroke of the cylinder 26 which determines the angle of rotation A. However, any other equivalent training means could be used.

On relèvera que le dispositif de lavage à haute pression est totalement indépendant du rotor 2 et se trouve au-dessus de la zone occupée par celui-ci et par le béton dans la cuve 1. Les buses 14 peuvent être disposées de la manière la plus efficace pour que les jets atteignent n'importe quelle surface dans la cuve. L'alimentation à haute pression au moyen du tuyau flexible 22 offre d'excellentes garanties de sécurité vis-à-vis des fuites et assure une longue durée de service. Sa forme en spirale évite une torsion du tuyau. Ce dispositif de lavage permet en outre un nettoyage sans intervention manuelle ce qui supprime tous les risques liés à une telle intervention. De plus, le nettoyage peut être commandé à distance par un opérateur placé dans une salle de commande. Il peut aussi être réalisé selon des cycles de nettoyage automatiques.It will be noted that the high-pressure washing device is completely independent of the rotor 2 and is located above the zone occupied by it and by the concrete in the tank 1. The nozzles 14 can be arranged in the most effective so that the jets reach any surface in the tank. The high pressure supply by means of the flexible hose 22 offers excellent guarantees against leakage safety and ensures a long service life. Its spiral shape prevents twisting of the pipe. This washing device also allows cleaning without manual intervention which eliminates all the risks associated with such intervention. In addition, cleaning can be controlled remotely by an operator located in a control room. It can also be carried out according to automatic cleaning cycles.

La présente invention n'est pas limitée à l'exemple de réalisation décrit ci-dessus, mais s'étend à toute modification ou variante évidente pour un homme du métier. En particulier, l'alimentation en eau du bras mobile 11 peut s'effectuer autrement que par le tube axial 15, par exemple au moyen d'un tube excentré passant à l'extérieurdu palier 17, à travers une fente semi-circulaire du capot 9, et portant le raccord mobile 20. On notera aussi qu'un dispositif de lavage analogue à celui de l'exemple décrit peut être prévu dans un malaxeur à axe horizontal, dans la mesure où le bras mobile peut occuper une position de repos où il n'est pas atteint par le béton malaxé.The present invention is not limited to the embodiment described above, but extends to any modification or variant obvious to a person skilled in the art. In particular, the water supply to the movable arm 11 can take place otherwise than through the axial tube 15, for example by means of an eccentric tube passing outside the bearing 17, through a semicircular slot in the cover. 9, and carrying the movable connector 20. It will also be noted that a washing device similar to that of the example described can be provided in a mixer with horizontal axis, insofar as the movable arm can occupy a rest position where it is not reached by the mixed concrete.

Claims (10)

1. Malaxeur à béton pourvu d'un dispositif de lavage à haute pression, ce malaxeur comportant une cuve stationnaire (1) et un rotor (2) agencé pour tourner dans la cuve, et le dispositif de lavage comportant au moins un bras mobile (11), pourvu de buses de projection et agencé pour effectuer un mouvement rotatif dans la cuve, et des conduits d'alimentation reliant les buses de projection à une source stationnaire de liquide de nettoyage à haute pression qui se trouve à l'extérieur de la cuve, caractérisé en ce que lesdits conduits d'alimentation comportent un tuyau flexible à haute pression (22) entre un raccord stationnaire (21), raccordé à ladite source de liquide (23), et un raccord mobile (20) qui est raccordé aux buses de projection (14) et suit le mouvement rotatif du bras mobile (11), ce mouvement rotatif étant un mouvement en va-et-vient sur un angle limité (A) autour d'un axe de rotation (16).1. Concrete mixer provided with a high pressure washing device, this mixer comprising a stationary tank (1) and a rotor (2) arranged to rotate in the tank, and the washing device comprising at least one movable arm ( 11), provided with projection nozzles and arranged to perform a rotary movement in the tank, and supply conduits connecting the projection nozzles to a stationary source of high pressure cleaning liquid which is located outside the tank, characterized in that said supply conduits comprise a flexible high pressure hose (22) between a stationary connector (21), connected to said liquid source (23), and a movable connector (20) which is connected to projection nozzles (14) and follows the rotary movement of the movable arm (11), this rotary movement being a reciprocating movement on a limited angle (A) around an axis of rotation (16). 2. Malaxeur selon la revendication 1, caractérisé en ce que le tuyau flexible (22) a une forme en spirale, le raccord mobile (20) étant plus proche de l'axe de rotation que le raccord stationnaire (21).2. Mixer according to claim 1, characterized in that the flexible pipe (22) has a spiral shape, the movable connector (20) being closer to the axis of rotation than the stationary connector (21). 3. Malaxeur selon la revendication 1, caractérisé en ce que ledit axe de rotation (16) est vertical et coïncide avec l'axe du rotor (2), et en ce que le bras mobile (11) se trouve au-dessus du rotor.3. Mixer according to claim 1, characterized in that said axis of rotation (16) is vertical and coincides with the axis of the rotor (2), and in that the movable arm (11) is located above the rotor . 4. Malaxeur selon la revendication 3, caractérisé en ce que le rotor (2) est monté sur un support fixe (8) solidaire d'un fond (7) de la cuve et en ce que le bras mobile (11) est monté dans un palier (17) supporté par un capot supérieur (9) de la cuve.4. Mixer according to claim 3, characterized in that the rotor (2) is mounted on a fixed support (8) integral with a bottom (7) of the tank and in that the movable arm (11) is mounted in a bearing (17) supported by an upper cover (9) of the tank. 5. Malaxeur selon la revendication 1, caractérisé en ce que le bras mobile est supporté par un tube axial (15) monté dans le palier de rotation (17) et constituant un tronçon de conduit d'alimentation, et en ce que des moyens d'entraînement (26, 27, 28) sont couplés au tube axial à l'extérieur de la cuve, pour produire le mouvement rotatif du bras mobile.5. Mixer according to claim 1, characterized in that the movable arm is supported by an axial tube (15) mounted in the rotation bearing (17) and constituting a section of supply duct, and in that means d The drives (26, 27, 28) are coupled to the axial tube on the outside of the tank, to produce the rotary movement of the movable arm. 6. Malaxeur selon la revendication 5, caractérisé en ce que ledit tube axial (15) est raccordé rigidement au raccord mobile (20) au moyen d'un tronçon de tube radial (19) supportant ledit raccord mobile à distance de l'axe de rotation (16).6. Mixer according to claim 5, characterized in that said axial tube (15) is rigidly connected to the mobile connector (20) by means of a section of radial tube (19) supporting said mobile connector at a distance from the axis of rotation (16). 7. Malaxeur selon la revendication 5, caractérisé en ce que les moyens d'entraînement comportent un vérin à pression de fluide (26), dont la course détermine l'angle de rotation (A) du bras mobile.7. Mixer according to claim 5, characterized in that the drive means comprise a fluid pressure cylinder (26), the stroke of which determines the angle of rotation (A) of the movable arm. 8. Malaxeur selon la revendication 1, caractérisé en ce que le bras mobile comporte deux branches (12,13) s'étendant sensiblement symétriquement par rapport à l'axe de rotation.8. Mixer according to claim 1, characterized in that the movable arm comprises two branches (12,13) extending substantially symmetrically relative to the axis of rotation. 9. Malaxeur selon la revendication 1, caractérisé en ce que l'angle de rotation (A) du bras mobile est inférieur ou égal à 360°.9. Mixer according to claim 1, characterized in that the angle of rotation (A) of the movable arm is less than or equal to 360 °. 10. Malaxeur selon la revendication 9, caractérisé en ce que l'angle de rotation (A) du bras mobile est supérieur à 180°.10. Mixer according to claim 9, characterized in that the angle of rotation (A) of the movable arm is greater than 180 °.
EP94440005A 1993-01-20 1994-01-20 Concrete mixer with high pressure washing device Ceased EP0608191A1 (en)

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FR9300687A FR2700492B1 (en) 1993-01-20 1993-01-20 Concrete mixer fitted with a high pressure washing device.
FR9300687 1993-01-20

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Cited By (10)

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DE29621940U1 (en) * 1996-12-17 1997-02-06 Liebherr-Mischtechnik Gmbh, 88427 Bad Schussenried Cleaning device for a mixer, preferably a ring plate mixer
EP1364700A2 (en) * 2002-05-24 2003-11-26 Metalurgica Poyatos S.A. Device for cleaning concrete mixers
EP1504810A1 (en) * 2003-08-07 2005-02-09 Geco GmbH Process for cleaning a mixing drum, and apparatus therefore
WO2009021776A2 (en) * 2007-08-14 2009-02-19 Robert Bosch Gmbh Cleaning apparatus for a capsule filling machine
CN102233612A (en) * 2010-05-07 2011-11-09 中集车辆（集团）有限公司 Tank cleaning apparatus, and concrete mixing and transporting car
CN108453898A (en) * 2018-03-06 2018-08-28 长乐智睿恒创节能科技有限责任公司 A kind of construction concrete central mix plant
CN110898746A (en) * 2019-11-26 2020-03-24 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine
CN111203981A (en) * 2020-01-09 2020-05-29 赵东明 Environment-friendly cement agitating unit for building
CN111729538A (en) * 2020-07-10 2020-10-02 苏州工业园区职业技术学院 Full self-cleaning agitating unit
CN113650161A (en) * 2021-10-20 2021-11-16 徐州京安新型建材科技有限公司 Mortar concrete mixing device

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CN105880236B (en) * 2016-06-01 2019-05-03 福建南方路面机械有限公司 Multiple spot purging system and multiple spot cleaning method for concrete mixer
CN106140705B (en) * 2016-08-26 2018-12-04 新疆玉昆仑天然食品工程有限公司 A kind of freeze-drying apparatus that band cleans automatically
CN115534122B (en) * 2022-11-02 2023-06-06 江西银杉白水泥股份有限公司 Polymer sand processingequipment based on pouring method

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29621940U1 (en) * 1996-12-17 1997-02-06 Liebherr-Mischtechnik Gmbh, 88427 Bad Schussenried Cleaning device for a mixer, preferably a ring plate mixer
EP1364700A2 (en) * 2002-05-24 2003-11-26 Metalurgica Poyatos S.A. Device for cleaning concrete mixers
EP1364700A3 (en) * 2002-05-24 2005-07-13 Metalurgica Poyatos S.A. Device for cleaning concrete mixers
EP1504810A1 (en) * 2003-08-07 2005-02-09 Geco GmbH Process for cleaning a mixing drum, and apparatus therefore
WO2009021776A2 (en) * 2007-08-14 2009-02-19 Robert Bosch Gmbh Cleaning apparatus for a capsule filling machine
WO2009021776A3 (en) * 2007-08-14 2009-04-30 Bosch Gmbh Robert Cleaning apparatus for a capsule filling machine
CN102233612A (en) * 2010-05-07 2011-11-09 中集车辆（集团）有限公司 Tank cleaning apparatus, and concrete mixing and transporting car
CN108453898A (en) * 2018-03-06 2018-08-28 长乐智睿恒创节能科技有限责任公司 A kind of construction concrete central mix plant
CN110898746A (en) * 2019-11-26 2020-03-24 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine
CN110898746B (en) * 2019-11-26 2021-01-29 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine
CN111203981A (en) * 2020-01-09 2020-05-29 赵东明 Environment-friendly cement agitating unit for building
CN111203981B (en) * 2020-01-09 2021-04-13 湖南雁星建筑工程有限公司 Environment-friendly cement agitating unit for building
CN111729538A (en) * 2020-07-10 2020-10-02 苏州工业园区职业技术学院 Full self-cleaning agitating unit
CN113650161A (en) * 2021-10-20 2021-11-16 徐州京安新型建材科技有限公司 Mortar concrete mixing device

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