EP0367912B1 - Mixing and feeding device using compressed air - Google Patents

Mixing and feeding device using compressed air Download PDF

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Publication number
EP0367912B1
EP0367912B1 EP89114335A EP89114335A EP0367912B1 EP 0367912 B1 EP0367912 B1 EP 0367912B1 EP 89114335 A EP89114335 A EP 89114335A EP 89114335 A EP89114335 A EP 89114335A EP 0367912 B1 EP0367912 B1 EP 0367912B1
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EP
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Prior art keywords
pressure
unit according
mixing
pipe
hydromotor
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EP89114335A
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German (de)
French (fr)
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EP0367912A1 (en
Inventor
Manfred Dipl.-Ing. Kempf
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Putzmeister Concrete Pumps GmbH
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Putzmeister Werk Maschinenfabrik GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806—Details; Accessories
    • B28C5/0831—Drives or drive systems, e.g. toothed racks, winches
    • B28C5/085—Hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1223—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers discontinuously operating mixing devices, e.g. with consecutive containers
    • B28C5/123—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers discontinuously operating mixing devices, e.g. with consecutive containers with pressure or suction means for discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/02—Controlling the operation of the mixing
    • B28C7/022—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component
    • B28C7/026—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component by measuring data of the driving system, e.g. rotational speed, torque, consumed power

Description

Die Erfindung betrifft ein Misch- und Druckluftfördergerät, insbesondere für Mörtel oder Beton, mit einem mit Mischgut beschickbaren, an eine Förderleitung angeschlossenen, ein motorisch angetriebenes Ruhrwerk enthaltenden und mit Druckluft beaufschlagbaren Mischkessel, einem Antriebsmotor, einem durch den Antriebsmotor angetriebenen Kompressor für die Erzeugung der Druckluft und einer Überlastschutzeinrichtung für den Antriebsmotor.The invention relates to a mixing and compressed air conveying device, in particular for mortar or concrete, with a mixing vessel which can be loaded with mixed material, is connected to a conveying line and contains a motor-driven agitator system and can be pressurized with compressed air, a drive motor, and a compressor driven by the drive motor for generating the Compressed air and an overload protection device for the drive motor.

Misch- und Druckluftfördergeräte dieser Art dienen in der Bauindustrie zur Mischung und Förderung von Dickstoffen, insbesondere von Dickstoffen mit geringem Wassergehalt wie Mörtel, Estrich-Beton oder dergleichen (DE-A-2946813). Das beispielsweise aus Sand und einem Bindemittel bestehende Mischgut wird unter Wasserzugabe über eine Einfüllöffnung dem Mischkessel zugeführt. Dort wird bei laufendem Rührwerk das Mischgut gründlich durchmischt. Zur Förderung wird nach Fertigstellung der Mischung der Deckel des Mischkessels geschlossen, der Kompressor eingeschaltet und die komprimierte Luft dem Mischkessel zugeführt. Der Dickstoff wird in Form von Pfropfen gefördert, die von Druckluftpolstern unterbrochen werden sobald die Schaufel des Rührwerks das Austreten von Material in die Förderleitung blockiert.Mixing and compressed air conveyors of this type are used in the construction industry for mixing and conveying thick materials, in particular thick materials with low water content such as mortar, screed concrete or the like (DE-A-2946813). The mix, which consists for example of sand and a binder, is fed to the mixing kettle with the addition of water through a filling opening. There, the mix is thoroughly mixed while the agitator is running. To complete the mixing process, the lid of the mixing tank is closed, the compressor is switched on and the compressed air is fed to the mixing tank. The thick matter is conveyed in the form of plugs, which are interrupted by compressed air cushions as soon as the blade of the agitator blocks the escape of material into the delivery line.

Wird als Antriebsmotor ein Dieselmotor verwendet, so wird mit dem Einschalten des Kompressors gleichzeitig dessen Drehzahl erhöht, um eine größere Druckluftmenge zu erzeugen und damit den Arbeitszyklus der Maschine zu verkürzen. Eine Drehzahlerhöhung des Rührwerks bei Beginn der Förderung ist jedoch ungünstig, da der fertig gemischte Dickstoff beim Beaufschlagen mit Druckluft dem Rührwerk einen beträchtlich höheren Widerstand entgegensetzt, wodurch sich die Leistungsanforderung des Motors erhöht. Da aus Kostengründen in der Praxis Misch- und Druckluftfördergeräte mit möglichst geringer Motorantriebsleistung ausgelegt werden, kommt es durch die erhöhte Leistungsanforderung zu einem unerwünschten Absinken der Motordrehzahl, unter ungünstigen Umständen sogar zu einem Abwürgen des Dieselmotors.If a diesel motor is used as the drive motor, when the compressor is switched on, its speed is increased at the same time in order to generate a larger amount of compressed air and thus shorten the machine's work cycle. However, increasing the speed of the agitator at the start of the conveyance is disadvantageous since the ready-mixed thick matter presents the agitator with a considerably higher resistance when pressurized with compressed air, which increases the power requirement of the motor. Since in practice, for reasons of cost, mixing and compressed air conveyors are designed with the lowest possible motor drive power, the increased power requirement leads to an undesirable drop in the engine speed, and in unfavorable circumstances, even a stalling of the diesel engine.

Bei Geräten mit elektrischem Antriebsmotor kommt es durch das Zuschalten des Kompressors und das dadurch bedingte erhöhte Lastmoment am Rührwerk zu einer starken Erhöhung der Stromaufnahme. Dies kann bei schwach dimensionierten Motoren zu einem Ansprechen der Sicherungen führen.In devices with an electric drive motor, switching on the compressor and the resulting increased load torque on the agitator leads to a sharp increase in current consumption. In the case of weakly dimensioned motors, this can cause the fuses to trip.

Bei bekannten Geräten regelt man deshalb die Leistungsaufnahme des Kompressors herunter oder setzt Kompressoren geringerer Leistung ein; jedoch wird dann die Förderleistung der Maschine reduziert und damit der Arbeitszyklus verlängert.In known devices, therefore, the power consumption of the compressor is reduced or compressors of lower power are used; however, the conveying capacity of the machine is then reduced and the working cycle is thus extended.

Zudem kann es zu einer Überlastung des Antriebsmotors kommen, wenn sich z.B. grobe Steine zwischen den Schaufeln des Rührwerks und der Wand des Mischkessels verklemmen, wenn versehentlich vor Befüllen des Mischkessels vergessen wird Wasser zuzugeben oder wenn die Beschickung mit Mischgut zu schnell erfolgt. Sitzt das Rührwerk vollständig fest, so muß der Mischkessel von Hand mühsam entleert werden, bevor weitergearbeitet werden kann.In addition, the drive motor may be overloaded if e.g. Clamp coarse stones between the blades of the agitator and the wall of the mixing kettle if you accidentally forget to add water before filling the mixing kettle or if the mix is loaded too quickly. If the agitator is completely seated, the mixing kettle must be laboriously emptied by hand before work can continue.

Aus der FR-A-1 500 912 ist ein Antrieb bekanntgeworden, mit einem Hydromotor, der über zwei durch einen Antriebsmotor gemeinsam angetriebene Hydropumpen über eine Druckleitung mit Drucköl beaufschlagbar ist. Weiter sind Regelvorrichtungen für Hydromotoren bekannt (DE-A-2419305, GB-A-839025, GB-A-1051692), die als Antrieb für Mischeinrichtungen verwendet werden. Bei der aus der DE-A-2419305 bekannten Vorrichtung wird die Drehzahl des antreibenden Hydromotors geregelt, während bei der aus der GB-A-839025 bekannten Vorrichtung die Drehrichtung des Hydromotors umgekehrt oder die Drehzahl geregelt wird.From FR-A-1 500 912 a drive has become known with a hydraulic motor which can be pressurized with pressure oil via a pressure line via two hydraulic pumps driven jointly by a drive motor. Control devices for hydraulic motors are also known (DE-A-2419305, GB-A-839025, GB-A-1051692), which are used as drives for mixing devices. In the device known from DE-A-2419305 the speed of the driving hydraulic motor is regulated, while in the device known from GB-A-839025 the direction of rotation of the hydraulic motor is reversed or the speed is regulated.

Der Erfindung liegt die Aufgabe zugrunde, ein Misch- und Druckluftfördergerät der eingangs angegebenen Art zu entwickeln, dessen Antriebsmotor unter Erhaltung einer hohen Misch- und Förderleistung wirksam vor Überlastung geschützt ist.The invention has for its object to develop a mixing and compressed air delivery device of the type specified, the drive motor is effectively protected from overload while maintaining a high mixing and delivery rate.

Zur Lösung dieser Aufgabe werden die im Patentanspruch 1 angegebenen Merkmale vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.To solve this problem are in the claim 1 features proposed. Advantageous refinements and developments of the invention result from the subclaims.

Die erfindungsgemäße Lösung geht von dem Gedanken aus, daß die Kraftübertragung vom Antriebsmotor durch mindestens zwei gemeinsam angetriebene Hydropumpen erfolgt, mit denen eine stufenweise Reduzierung der Drehzahl des Hydromotors durch Umschalten einer oder mehrerer Hydropumpen auf drucklosen Umlauf erfolgt, sobald ein einstellbarer Drucksollwert in der Druckleitung und/oder im Mischkessel überschritten wird. Um dies zu erreichen, wird gemäß der Erfindung vorgeschlagen, daß das Rührwerk mittels eines Hydromotors antreibbar ist, der über mindestens zwei durch den Antriebsmotor gemeinsam angetriebene Hydropumpen über Druckleitungen mit Drucköl beaufschlagbar ist, und daß die Ölströme der Hydropumpen bei niedrigen, in den Druckleitungen und/oder im Mischkessel herrschenden Drücken parallel geschaltet sind und bei Überschreiten mindestens eines einstellbaren Drucksollwerts in den Druckleitungen und/oder im Mischkessel partiell auf drucklosen Umlauf umschaltbar sind.The solution according to the invention is based on the idea that the power transmission from the drive motor is carried out by at least two jointly driven hydraulic pumps, with which a gradual reduction in the speed of the hydraulic motor takes place by switching one or more hydraulic pumps to unpressurized circulation as soon as an adjustable pressure setpoint in the pressure line and / or is exceeded in the mixing vessel. To achieve this, it is proposed according to the invention that the agitator can be driven by means of a hydraulic motor which can be pressurized with pressure oil via pressure lines via at least two hydraulic pumps driven jointly by the drive motor, and that the oil flows of the hydraulic pumps at low, in the pressure lines and / or the pressure prevailing in the mixing vessel are connected in parallel and, if at least one adjustable pressure setpoint in the pressure lines and / or in the mixing vessel is exceeded, it can be partially switched over to unpressurized circulation.

Das Rührwerk läuft bei Förderbeginn zweckmäßig mit reduzierter Drehzahl, da bedingt durch den hohen Füllgrad des Mischkessels laufend Dickstoff vor die Austrittsöffnung der Förderleitung rutscht, so daß ein schnelles Zufördern durch das Rührwerk nicht notwendig ist. Auch läßt sich durch die Drehzahlreduzierung die Beanspruchung von Mischkessel und Rührwerk und damit deren Verschleiß senken. Durch ein Steigen des Lastmoments am Rührwerk steigt auch der Druck in den Druckleitungen zwischen den Hydropumpen und dem Hydromotor. Der Druck in einer der Druckleitungen kann über eine Steuerleitung einem einstellbaren Druckabschaltventil zugeführt werden, das zusammen mit einem zu dieser Druckleitung hin öffnenden Rückschlagventil in der verbraucherseitigen Hydraulikleitung einer weiteren Hydropumpe angeordnet sein kann. Beim Erreichen des eingestellten Drucks läßt das Druckabschaltventil den Ölstrom dieser Hydropumpe zum Tank hin abfließen.The agitator expediently runs at a reduced speed at the start of the conveyance, since due to the high filling level of the mixing kettle, thick matter continuously slips in front of the outlet opening of the conveying line, so that rapid feeding through the agitator does not necessary is. The reduction in speed can also reduce the stress on the mixing vessel and agitator and thus their wear. As the load torque on the agitator increases, the pressure in the pressure lines between the hydraulic pumps and the hydraulic motor also increases. The pressure in one of the pressure lines can be supplied via a control line to an adjustable pressure shut-off valve, which can be arranged in the consumer-side hydraulic line of a further hydraulic pump together with a check valve opening towards this pressure line. When the set pressure is reached, the pressure cut-off valve allows the oil flow from this hydraulic pump to flow off to the tank.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht eine Umkehrung der Drehrichtung des Hydromotors vor, sobald das Rührwerk blockiert wird, z.B. durch einen größeren Stein, der sich zwischen Schaufeln und Mischkesselwand verklemmt. Die Umkehr der Drehrichtung kann zweckmäßig mittels eines in der Druckleitung des Hydromotors angeordneten Umsteuerventils erfolgen, das über einen Drucksensor ansteuerbar sein kann, der bei Überschreiten eines vorgegebenen Drucksollwerts in der Druckleitung anspricht.Another preferred embodiment of the invention provides a reversal of the direction of rotation of the hydraulic motor as soon as the agitator is blocked, e.g. through a larger stone jammed between the shovels and the mixing bowl wall. The direction of rotation can be reversed expediently by means of a reversing valve arranged in the pressure line of the hydraulic motor, which can be controlled by a pressure sensor which responds when a predetermined pressure setpoint in the pressure line is exceeded.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann das gesamte Drucköl zum Tank geleitet werden, sobald ein an der Einfüllöffnung des Mischkessels angeordneter Schutzgrill geöffnet wird. Eine derartige Maßnahme dient insbesondere der Unfallverhütung, indem sie ein Hineingreifen in den Mischkessel bei laufendem Rührwerk verhindert. Zweckmäßig erfolgt die Ableitung des Drucköls zum Tank mit Hilfe eines federgespannten Wegeventils, dessen Feder sich beim Öffnen des Schutzgrills durch Umschalten des Wegeventils entspannt.According to a further advantageous embodiment of the invention, the entire pressure oil can be directed to the tank as soon as a protective grill arranged at the fill opening of the mixing kettle is opened. A such measure serves in particular to prevent accidents by preventing reaching into the mixing bowl while the agitator is running. The pressure oil is expediently discharged to the tank with the aid of a spring-loaded directional valve, the spring of which relaxes when the protective grill is opened by switching over the directional valve.

Im folgenden wird die Erfindung anhand eines in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing.

Die einzige Figur zeigt ein Schaltschema einer hydraulischen Kraftübertragung für ein Misch- und Druckluftfördergerät.The single figure shows a circuit diagram of a hydraulic power transmission for a mixing and compressed air conveyor.

Das in der Zeichnung dargestellte Misch- und Fördergerät besteht im wesentlichen aus einem mit Mischgut beschickbaren, an eine Förderleitung 31 angeschlossenen, ein Rührwerk 25 enthaltenden und mit Druckluft beaufschlagbaren Mischkessel 24, einem als Dieselmotor ausgebildeten Antriebsmotor 20, einem durch den Antriebsmotor antreibbaren Kompressor 21 für die Erzeugung der Druckluft, sowie zwei gemeinsam durch den Antriebsmotor 20 angetriebenen Hydropumpen 10,15, die über Druckleitungen 11,12,13 den Hydromotor 30 für den Antrieb des Rührwerks 25 mit Drucköl beaufschlagen. Zwischen Hydromotor 30 und Rührwerk 25 ist ein Untersetzungsgetriebe 37 angeordnet.The mixing and conveying device shown in the drawing essentially consists of a mixing vessel 24 that can be loaded with mixed material, connected to a conveying line 31, contains an agitator 25 and can be pressurized with compressed air, a drive motor 20 designed as a diesel engine, and a compressor 21 that can be driven by the drive motor the generation of the compressed air, and two hydraulic pumps 10, 15 driven jointly by the drive motor 20, which pressurize the hydraulic motor 30 for driving the agitator 25 with pressure oil via pressure lines 11, 12, 13. A reduction gear 37 is arranged between the hydraulic motor 30 and the agitator 25.

Die Beschickung des Mischkessels 24 mit Mischgut erfolgt über die mit einem Schutzgrill 26 versehene Einfüllöffnung 22. Für die Beaufschlagung des Mischkessels 24 mit Druckluft ist ausgehend vom Kompressor 21 eine im oberen Bereich des Mischkessels 24, sowie in der Austrittsöffnung 28 mündende Druckluftzuleitung 29 vorgesehen. Während des Fördervorgangs wird der Dickstoff in Pfropfenform, abschnittsweise von Druckluftpolstern unterbrochen, durch die Förderleitung 31 zur Baustelle gefördert.Mixing kettle 24 is fed with mixed material via the filling opening 22 provided with a protective grill 26. Compressed air is supplied from the compressor 21 to a compressed air supply line 29 which opens into the upper region of the mixing kettle 24 and into the outlet opening 28 to supply the mixing kettle 24. During the conveying process, the thick material in plug form, interrupted in sections by compressed air cushions, is conveyed through the conveying line 31 to the construction site.

Um bei Beginn des Fördervorgangs die Drehzahl des Rührwerks 25 verringern zu können, ist in der Druckleitung 13 der Hydropumpe 15 ein einstellbares Wegeventil 27 angeordnet, das bei Erreichen eines vorgegebenen Luftdrucks im Mischkessel 24 über eine Leitung 46 pneumatisch umschaltbar ist. Nach Umschalten des Wegeventils 27 fördert die Hydropumpe 15 den Ölstrom direkt über die Leitung 33 zum Tank 34.In order to be able to reduce the speed of the agitator 25 at the start of the conveying process, an adjustable directional valve 27 is arranged in the pressure line 13 of the hydraulic pump 15 and can be pneumatically switched over a line 46 when a predetermined air pressure in the mixing vessel 24 is reached. After switching the directional control valve 27, the hydraulic pump 15 conveys the oil flow directly via line 33 to the tank 34.

Steigt das auf das Rührwerk 25 wirkende Lastmoment, so steigt auch die Belastung des Hydromotors 30 und damit bei gleichbleibender Förderung der Hydropumpen 10,15 der Öldruck in den Druckleitungen 11,12,13 sowie in der zum Druckabschaltventil 40 führenden Steuerleitung 35. Erreicht der Druck einen zuvor am Druckabschaltventil 40 eingestellten Wert, so schaltet das Druckabschaltventil 40 um. Die von der Hydropumpe 15 geförderte Ölmenge fließt über die Rücklaufleitung 33 direkt zum Tank 34 zurück. Das Rückschlagventil 45 verhindert dabei, daß die von der Hydropumpe 10 geförderte Ölmenge ebenfalls über das Druckabschaltventil 40 zum Tank 34 gefördert wird.If the load moment acting on the agitator 25 increases, the load on the hydraulic motor 30 also increases and thus, with the constant delivery of the hydraulic pumps 10, 15, the oil pressure in the pressure lines 11, 12, 13 and in the control line 35 leading to the pressure cut-off valve 40. The pressure reaches a value previously set on the pressure cut-off valve 40, the pressure cut-off valve 40 switches over. The amount of oil delivered by the hydraulic pump 15 flows back to the tank 34 via the return line 33. The check valve 45 prevents the amount of oil delivered by the hydraulic pump 10 is also delivered to the tank 34 via the pressure cut-off valve 40.

Beim Öffnen eines an der Eintrittsöffnung 22 des Mischkessels 24 vorgesehenen Schutzgrills 26 wird die Feder des im weiteren Verlauf der Druckleitung 12 angeordneten federfixierten Wegeventils 32 durch Umschalten des Ventils 32 entlastet. Bei entlasteter Feder sind beide Hydropumpen 10,15 auf drucklosen Umlauf geschaltet.When a protective grill 26 provided at the inlet opening 22 of the mixing vessel 24 is opened, the spring of the spring-fixed directional valve 32 arranged in the further course of the pressure line 12 is relieved by switching over the valve 32. When the spring is released, both hydraulic pumps 10, 15 are switched to unpressurized circulation.

Im weiteren Verlauf der Druckleitung 12 ist ein Umsteuerventil 17 angeordnet, mit dem sich die Drehrichtung des Hydromotors 30 umkehren läßt. Das Umsteuerventil 17 wird über einen, auf den Druck in der Druckleitung 12 ansprechenden Drucksensor 19 angesteuert. Beim Blockieren des Rührwerks 25 steigt das Lastmoment am Rührwerk und damit der Druck in der Druckleitung 12 schnell an. Bei Erreichen eines am Druckabschaltventil 40 eingestellten Drucksollwerts wird zuerst die Hydropumpe 15 über das Druckabschaltventil 40 auf drucklosen Umlauf geschaltet. Da hierdurch jedoch die Ursache der Blockierung nicht beseitigt wird, erhöht sich der Druck in der Druckleitung 12 so lange weiter, bis über den Drucksensor 19 das Umsteuerventil 17 angesteuert wird. Das Umsteuerventil 17 schaltet um und der Hydromotor 30 und damit das Rührwerk 25 laufen rückwärts, bis nach Ablauf einer gewissen Zeitdauer das Umsteuerventil 17 erneut angesteuert wird, so daß der Hydromotor 30 wieder vorwärts läuft. Durch das kurzzeitige Rückwärtslaufen wird die Blockierung in aller Regel beseitigt.In the further course of the pressure line 12, a reversing valve 17 is arranged, with which the direction of rotation of the hydraulic motor 30 can be reversed. The reversing valve 17 is controlled by a pressure sensor 19 which responds to the pressure in the pressure line 12. When the agitator 25 is blocked, the load moment at the agitator and thus the pressure in the pressure line 12 increases rapidly. When a pressure setpoint set on the pressure cut-off valve 40 is reached, the hydraulic pump 15 is first switched to pressureless circulation via the pressure cut-off valve 40. However, since this does not eliminate the cause of the blockage, the pressure in the pressure line 12 continues to increase until the reversing valve 17 is actuated via the pressure sensor 19. The reversing valve 17 switches over and the hydraulic motor 30 and thus the agitator 25 run backwards until after a certain period of time the reversing valve 17 is activated again, so that the hydraulic motor 30 runs forward again. Blocking is usually removed by running backwards for a short time.

Claims (8)

  1. A mixer and compressed-air conveyer unit, in particular for mortar or concrete, comprising a mixing vessel (24), which is loaded with mixing material, connected to a conveyer pipe (31) and includes a motor driven stirring device (25) and is loaded by compressed air, a drive motor (20̸), a motor-driven (20̸) compressor (21) for producing compressed air and an overload protection for the drive motor (20̸), characterised in that the mixing device (25) is driven by a hydromotor (30̸) which is charged with hydraulic oil via pressure pipes (11, 12) by at least two jointly driven hydropumps (10̸, 15), and that the oil flows of the hydropumps (10̸, 15) are switched in parallel in the event of low pressures in the pressure pipes (11, 12) and/or in the mixing vessel (24), and partially to pressure-free rotation in the event that at least one adjustable nominal pressure value is exceeded in the pressure pipes (11, 12) and/or in the mixing vessel (24).
  2. A mixer and compressed-air conveyer unit according to claim 1, characterised in that the direction of rotation of the hydromotor (30̸) is reversible on exceeding a specified nominal pressure value in the pressure pipe (12).
  3. A unit according to one of claims 1 or 2, characterized in that the hydraulic oil supply to the hydromotor (30̸) is shut off when a specified nominal pressure value is exceeded in the pressure pipe (11, 12) and/or when opening a protective grill (26), which is arranged in the area of the filler opening of the mixing vessel (24).
  4. A unit according to one of claims 1 to 3, characterized in that the drive motor (20̸) is a combustion engine, preferably a diesel engine.
  5. A unit according to one of claims 1 to 4, characterized in that in the consumer hydraulic pipe (13) of at least one of the hydropumps (10̸, 15) is arranged an adjustable pressure shut-off valve (40̸), which is controlled via a pressure in the pressure pipe (11, 12), and a non-return valve (45), which opens towards the pressure pipe (11, 12).
  6. A unit according to claims 1 to 5, characterised in that in the consumer hydraulic pipe (13) of at least one of the hydropumps (10̸, 15) is arranged a re-direction control valve (27), which is adjustable to a specified nominal pressure value and which is preferably pneumatically or hydraulically controlled by the air pressure in the mixing vessel (24).
  7. A unit according to one of claims 2 to 6, characterized by a re-direction valve (17), which is arranged in the pressure pipe (12) of the hydromotor (30̸) and which, preferably alternatingly, reverses the direction of rotation of the hydromotor (30̸).
  8. A unit according to claim 7, characterized in that the re-direction valve (17) is controlled via a pressure sensor (19) which responds to a pressure in the pressure pipe (12) of the hydromotor (30̸).
EP89114335A 1988-10-29 1989-08-03 Mixing and feeding device using compressed air Expired - Lifetime EP0367912B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836930 1988-10-29
DE3836930A DE3836930A1 (en) 1988-10-29 1988-10-29 MIXED AND COMPRESSED AIR CONVEYOR

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EP0367912A1 EP0367912A1 (en) 1990-05-16
EP0367912B1 true EP0367912B1 (en) 1993-07-28

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EP89114335A Expired - Lifetime EP0367912B1 (en) 1988-10-29 1989-08-03 Mixing and feeding device using compressed air

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EP (1) EP0367912B1 (en)
DE (2) DE3836930A1 (en)
ES (1) ES2043983T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004014326A1 (en) * 2004-03-22 2005-10-06 Bms Bau-Maschinen-Service Ag Mixing machine for mixing mortar, flooring material or concrete comprises a securing unit to secure the filling opening of a mixing vessel

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211139A1 (en) * 1992-04-03 1993-10-07 Putzmeister Maschf Mixing and compressed air conveyor
DE4301474A1 (en) * 1992-10-02 1994-04-07 Putzmeister Maschf Mixing and conveying device
EP0662875B1 (en) * 1992-10-02 1997-12-10 PUTZMEISTER Aktiengesellschaft Mixer-conveyor
AU681040B2 (en) * 1994-06-30 1997-08-14 Max George Hood Apparatus for cement blending
AUPM657894A0 (en) * 1994-06-30 1994-07-21 Hood, Max George Method and apparatus for cement blending
DE50109837D1 (en) * 2000-01-27 2006-06-29 Kaeser Kompressoren Gmbh Method and device for mixing and conveying concrete
DE102008052150B4 (en) * 2008-10-20 2013-08-01 Heinz-Gerd Köhler Vorteiganlage
CN105298955A (en) * 2015-11-13 2016-02-03 湖南三一路面机械有限公司 Stirring and washing system and concrete machine

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1051692A (en) *
GB839025A (en) * 1957-08-29 1960-06-29 Ready Mixed Concrete Ltd Improvements relating to the driving of mixing drums on vehicles
GB966695A (en) * 1960-08-22 1964-08-12 Winget Ltd Improvements in machines for mixing concrete, mortar or other materials
GB936493A (en) * 1960-08-24 1963-09-11 Stothert & Pitt Ltd Concrete mixing and like apparatus
DE1500400B1 (en) * 1965-07-20 1970-12-03 Linde Ag Hydrostatic gear for driving the mixing drum of a transport mixer
FR1541098A (en) * 1967-08-23 1968-10-04 Improvements in the control of equipment such as mixers and the like
DE2101439B2 (en) * 1971-01-13 1974-05-02 Schlosser & Co Gmbh, 6209 Aarbergen Method for accelerating the emptying process in compulsory mixers for building materials
DE2312550A1 (en) * 1973-03-14 1974-09-26 Irion & Vosseler SAFETY DEVICE FOR HYDRAULIC SYSTEMS
AT324996B (en) * 1973-04-27 1975-09-25 Vogelbusch Gmbh PROCEDURE FOR DRIVING ROTATING GASOLING AND / OR STIRRING DEVICES FROM FERMENTERN, AND DRIVE DEVICE FOR PERFORMING THE PROCESS
DE2946813C2 (en) * 1979-11-20 1982-07-08 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Mixing and conveying device
DE3013373C2 (en) * 1980-04-05 1986-09-11 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Mixing and conveying device
DE3103942A1 (en) * 1981-02-05 1982-10-28 Stetter Gmbh, 8940 Memmingen Blockage indicator and device for the automatic release of a blockage especially in concrete pumps
DE3131330A1 (en) * 1981-08-07 1983-02-24 FBM-Fertigputz GmbH, 8000 München Apparatus for producing wet screed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004014326A1 (en) * 2004-03-22 2005-10-06 Bms Bau-Maschinen-Service Ag Mixing machine for mixing mortar, flooring material or concrete comprises a securing unit to secure the filling opening of a mixing vessel

Also Published As

Publication number Publication date
ES2043983T3 (en) 1994-01-01
EP0367912A1 (en) 1990-05-16
DE3836930A1 (en) 1990-05-03
DE58905038D1 (en) 1993-09-02

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