WO1993019914A1 - Pneumatic mixer and conveyor - Google Patents

Pneumatic mixer and conveyor Download PDF

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Publication number
WO1993019914A1
WO1993019914A1 PCT/EP1993/000764 EP9300764W WO9319914A1 WO 1993019914 A1 WO1993019914 A1 WO 1993019914A1 EP 9300764 W EP9300764 W EP 9300764W WO 9319914 A1 WO9319914 A1 WO 9319914A1
Authority
WO
WIPO (PCT)
Prior art keywords
oil
mixing
air
compressed air
hydraulic
Prior art date
Application number
PCT/EP1993/000764
Other languages
German (de)
French (fr)
Inventor
Manfred Kempf
Karl Schlecht
Original Assignee
Putzmeister-Werk Maschinenfabrik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Putzmeister-Werk Maschinenfabrik Gmbh filed Critical Putzmeister-Werk Maschinenfabrik Gmbh
Priority to DE59303765T priority Critical patent/DE59303765D1/en
Priority to EP93907853A priority patent/EP0633831B1/en
Publication of WO1993019914A1 publication Critical patent/WO1993019914A1/en

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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
    • B28C5/08—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

Definitions

  • the invention relates to a mixing and compressed air conveying device, in particular for mortar or concrete as mixed and conveyed material, with a mixing tank, which can be loaded with the mixed and conveyed material, connected to a conveying line, contains a motor-driven agitator and can be acted upon with compressed air - Drive motor and a screw compressor which can be driven by the drive motor for generating the compressed air, the agitator being drivable by means of a hydraulic motor which can be pressurized with pressure oil via at least one hydraulic pump driven by the drive motor and together with this is arranged in a hydraulic circuit containing an oil cooler and an oil filter, and wherein the screw compressor is arranged in an oil / air tank with air separator and oil sump, an oil cooler and an oil filter containing lubricating and cooling oil circuit.
  • Mixing and compressed air conveyors of this type are used in the construction industry for mixing and conveying thick matter such as mortar, screed, concrete or the like.
  • the mixture for example consisting of sand and a binder, is fed to the mixing kettle through the addition of water through a filling opening. There, the mix is thoroughly mixed while the agitator is running.
  • the lid of the mixing kettle is closed and compressed air is fed to the mixing kettle via the screw compressor. leads. Under the influence of the compressed air, the mixed and conveyed material is conveyed through the delivery line in the form of plugs separated from one another by compressed air cushions.
  • the hydraulic power transmission between the drive motor and agitator has considerable advantages in terms of its freedom from wear, both in terms of service life and in the feasibility of a hydraulically controlled overload protection for motors and mixers (EP 367 912 AI).
  • a hydraulic circuit with relatively complex components such as an oil tank, oil filter and oil cooler, is required for this.
  • the known mixed and compressed air conveyors usually contain a screw compressor with oil injection cooling and lubrication.
  • the screw compressor is arranged in a lubricating and cooling oil circuit which contains, inter alia, an oil / air container with an air separator and oil sump, an oil filter and an oil cooler.
  • the invention is based on the object of improving the known mixing and compressed air conveying device of the type specified at the outset in such a way that a lighter design, less assembly and piping effort and less maintenance effort can be achieved.
  • the solution according to the invention is based on the idea that the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor can be combined to form a uniform hydraulic system despite the fundamentally different tasks.
  • the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor have a common oil tank, which is preferably formed by the oil sump of the oil / air container.
  • a further simplification in this respect is achieved in that the hydraulic circuit and the lubricating and cooling oil circuit also have a common oil filter and / or oil cooler.
  • a preferred embodiment of the invention provides that the hydraulic pump of the agitator drive can be acted upon directly on the suction side or with oil from the oil sump of the oil / air container of the screw compressor via a pre-compressor pump. If a pre-compressor pump is used, any air that is still contained in the sucked-in oil is separated before the oil is fed to the hydraulic pump. With the pre-compressor pump, the hydraulic oil is pre-compressed to 30 bar, for example, and the air contained in it is separated off. The separated air can be returned to the oil / air tank via a compressed air line. To improve the air separation, at least one air separation stage can additionally be provided in the oil / air container. can be seen, which can consist of perforated plates, of which several can be arranged one behind the other in the oil / air tank.
  • the screw block of the screw compressor can be either an integrated or a separate component of the oil / air container.
  • the hydraulic motor of the agitator drive is connected on the return side via the oil cooler and oil filter in the manner of a series connection to the lubricant and oil inlet of the screw compressor.
  • the hydraulic motor of the agitator drive can open directly or indirectly via the oil filter and / or oil cooler into the oil / air container, while the screw compressor directly or indirectly via a further oil cooler and / or oil filter from the oil sump of the oil / air container with lubricant. and cooling oil can be applied.
  • the hydraulic motor of the agitator drive it is also possible for the hydraulic motor of the agitator drive to open directly into the oil / air container on the return side, during the Screw compressor from the oil sump of the oil / air container with the interposition of the oil filter and / or oil cooler can be acted upon with lubricating and cooling oil.
  • Figure 1 is a hydraulic circuit diagram of a mixing and compressed air conveyor.
  • FIG. 2 shows a hydraulic circuit diagram of a mixing and compressed-air conveying device modified compared to FIG. 1;
  • FIG. 3 shows a hydraulic circuit diagram of a further mixing and compressed air conveying device modified compared to FIG. 1.
  • the mixing and conveying devices shown schematically in the drawing essentially consist of a mixing vessel 18, which can be fed with mixed material via the closable filling opening 10, is connected to a conveying line 12, contains an agitator 14 and can be pressurized with compressed air via the openings 16 preferably designed as a diesel engine drive motor 20, a screw compressor 22 which can be driven by the drive motor for generating the compressed air, and two hydraulic pumps 24, 26 which are driven jointly by the drive motor 20 and which are driven by a hydraulic motor. Hydraulic control block 28 act on a hydraulic motor 30 for driving the agitator 14 with pressure oil.
  • the screw compressor 22 comprises a screw compressor 32 and an oil / air container 34 with compressed air separator 36 and oil sump 38.
  • the screw compressor 32 is on the suction side via an air filter 40 and a shut-off throttle valve 42 with atmospheric air and via an injection line 44, 44 '. can be loaded with lubricating and cooling oil.
  • the oil / air mixture emerging from the screw compressor under a pressure of 5 to 7 bar reaches the oil / air container 34 via a channel or a line 46.
  • compressed air reaches the air inlet openings 36 via the air separator 36 and the compressed air line 46 16 and conveys the mixed and conveyed material located in the mixing container 18 in drops through the conveying line 12 to the outside.
  • the hydraulic circuit leading to the hydraulic pump 30 and the lubricating and cooling oil circuit of the screw compressor are jointly supplied with oil from the oil sump 38 of the oil / air container. Likewise, only one oil cooler 50 and one oil filter 52 are provided for both oil circuits.
  • the low-pressure side of the hydraulic pumps 24, 26 is connected directly to the oil sump 38 via the supply line 54, while in the embodiment according to FIG. 2 a pre-compressor pump 56 is arranged in the supply line 54, in which the Pre-compressed oil from the oil sump 38 to a pressure of approx. 30 bar and thereby from the air contained therein is freed.
  • the compressed air separated in the pre-compressor 36 is returned to the oil / air tank via line 58.
  • a cooler 50 'and an oil filter 52' are additionally arranged in the oil injection line 44 'branched off from the oil sump 38'.
  • the oil sump is divided by an air separator 64 or a bulkhead into an entrance zone 60 and an exit zone 62. Thereby it is achieved that the air-laden oil coming into the oil / air container via the lines 46 and 48 is degassed at the air separating screen 64 or the bulkhead so that the exit zone 62 to which the lines 44, 44 'and 54 are connected are largely gas-free oil.
  • the invention relates to a mixing and compressed air conveying device, in particular for mortar or concrete as mixed and conveyed material, with a material which can be mixed with the mixed and conveyed material and is connected to a conveying line 12
  • Motor-driven agitator 14 containing and can be pressurized with compressed air mixing vessel 18, a drive motor 20 and a screw compressor 32 which can be driven by the drive motor for generating the compressed air.
  • the agitator can be driven by means of a hydraulic motor 30 which can be pressurized with pressure oil via at least one hydraulic pump 24, 26 driven by the drive motor 20.
  • the screw compressor 32 is arranged in a lubricating and cooling oil circuit containing an oil / air container 34 with an air separator 36 and an oil sump 38.
  • the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor 32 have a common oil tank formed by the oil sump 38 of the oil / air container and a common oil cooler 50 and oil filter 52 on.

Abstract

A pneumatic mixer and conveyor, in particular for mixing and conveying mortar or concrete, comprises a mixing tank (18) which can be filled with the material to be mixed and conveyed, is connected to a conveyor pipe (12), contains a motor-driven agitator (14) and to which compressed air may be applied. It also comprises a driving motor (20) and a screw-type compressor (32) that can be driven by the driving motor for generating compressed air. The agitaor may be driven by means of a hydraulic motor (30) to which pressure oil may be supplied by at least one hydraulic pump (24, 26) driven by the driving motor (20). The screw-type compressor (32) is arranged in a lubricating and cooling oil circuit that contains an oil/air reservoir (34) with an air separator (36) and oil sump (38). In order to obtain a light-weight design which is easy to mount and to service, the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw-type conveyor (32) have a common oil tank, formed by the oil sump (38) of the oil/air reservoir, as well as a common oil cooler (50) and oil filter (52).

Description

Misch- und DruckluftfördergerätMixing and compressed air conveyor
Beschreibungdescription
Die Erfindung betrifft ein Misch- und Druckluftförder¬ gerät, insbesondere für Mörtel oder Beton als Misch- und Fördergut, mit einem mit dem Misch- und Fördergut beschickbaren, an eine Förderleituπg angeschlossenen, ein motorisch angetriebenes Rührwerk enthaltenden und mit Druckluft beaufschlagbaren Mischkessel, einem Aπ- triebs otor und einem durch den Antriebsmotor antreib¬ baren Schraubenverdichter für die Erzeugung der Druck¬ luft, wobei das Rührwerk mittels eines Hydromotors an¬ treibbar ist, der über mindestens eine durch den An¬ triebsmotor angetriebene Hydropumpe mit Drucköl beauf¬ schlagbar und zusammen mit diesem in einem einen Ölküh¬ ler und einen Ölfilter enthaltenden Hydraulikkreis an¬ geordnet ist, und wobei der Schraubenverdichter in ei¬ nem einen Öl/Luftbehälter mit Luftabscheider und Öl¬ sumpf, einen Ölkühler und einen Ölfilter enthaltenden Schmier- und Kühlölkreis angeordnet ist.The invention relates to a mixing and compressed air conveying device, in particular for mortar or concrete as mixed and conveyed material, with a mixing tank, which can be loaded with the mixed and conveyed material, connected to a conveying line, contains a motor-driven agitator and can be acted upon with compressed air - Drive motor and a screw compressor which can be driven by the drive motor for generating the compressed air, the agitator being drivable by means of a hydraulic motor which can be pressurized with pressure oil via at least one hydraulic pump driven by the drive motor and together with this is arranged in a hydraulic circuit containing an oil cooler and an oil filter, and wherein the screw compressor is arranged in an oil / air tank with air separator and oil sump, an oil cooler and an oil filter containing lubricating and cooling oil circuit.
Misch- und Druckluftfördergeräte dieser Art dienen in der Bauindustrie zur Mischung und Förderung von Dick¬ stoffen, wie Mörtel, Estrich, Beton oder dergleichen. Das beispielsweise aus Sand und einem Bindemittel be¬ stehende Mischgut wird unter Wasserzugabe über eine Einfüllöffnung dem Mischkessel zugeführt. Dort wird bei laufendem Rührwerk das Mischgut gründlich durchgemischt Zur Förderung wird nach Fertigstellung der Mischung der Deckel des Mischkessels geschlossen und komprimierte Luft über den Schraubenverdichter dem Mischkessel zuge- führt. Unter der Einwirkung der Druckluft wird das Misch- und Fördergut in Form von durch Druckluftpolster voneinander getrennten Pfropfen durch die Förderleitung gefördert. Die hydraulische Kraftübertragung zwischen Antriebsmotor und Rührwerk bringt wegen der Verschlei߬ freiheit erhebliche Vorteile sowohl in der Standzeit als auch bei der Realisierbarkeit eines hydraulisch ge¬ regelten Überlastschutzes für Motoren und Mischer mit sich (EP 367 912 AI) . Andererseits ist hierfür ein Hy¬ draulikkreis mit relativ aufwendigen Bauteilen, wie Öl¬ tank, Ölfilter und Ölkühler erforderlich. Weiter ent¬ halten die bekannten Misch- und Druckluftförderer übli¬ cherweise einen Schraubenverdichter mit Öleinspritzküh- lung und -Schmierung. Der Schraubenverdichter ist zu diesem Zweck in einem Schmier- und Kühlölkreislauf an¬ geordnet, der u.a. einen Öl/Luftbehälter mit Luftab¬ scheider und Ölsumpf, einen Ölfilter und einen Ölkühler enthält.Mixing and compressed air conveyors of this type are used in the construction industry for mixing and conveying thick matter such as mortar, screed, concrete or the like. The mixture, for example consisting of sand and a binder, is fed to the mixing kettle through 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 kettle is closed and compressed air is fed to the mixing kettle via the screw compressor. leads. Under the influence of the compressed air, the mixed and conveyed material is conveyed through the delivery line in the form of plugs separated from one another by compressed air cushions. The hydraulic power transmission between the drive motor and agitator has considerable advantages in terms of its freedom from wear, both in terms of service life and in the feasibility of a hydraulically controlled overload protection for motors and mixers (EP 367 912 AI). On the other hand, a hydraulic circuit with relatively complex components, such as an oil tank, oil filter and oil cooler, is required for this. Furthermore, the known mixed and compressed air conveyors usually contain a screw compressor with oil injection cooling and lubrication. For this purpose, the screw compressor is arranged in a lubricating and cooling oil circuit which contains, inter alia, an oil / air container with an air separator and oil sump, an oil filter and an oil cooler.
Ausgehend hiervon liegt der Erfindung die Aufgabe zu¬ grunde, das bekannte Misch- und Druckluftfördergerät der eingangs angegebenen Art dahingehend zu verbessern, daß eine leichtere Bauweise, ein geringerer Montage- und Verrohrungsaufwand und ein geringerer Wartungsauf¬ wand erzielt werden kann.Proceeding from this, the invention is based on the object of improving the known mixing and compressed air conveying device of the type specified at the outset in such a way that a lighter design, less assembly and piping effort and less maintenance effort can be achieved.
Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 angegebene Merkmalskombination vorgeschlagen. Vorteil¬ hafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen. Die erfindungsgemäße Lösung geht von dem Gedanken aus, daß der Hydraulikkreis des Rührwerkantriebs und der Schmier- und Kühlölkreis des Schraubenverdichters trotz der grundsätzlich verschiedenen Aufgaben zu einem ein¬ heitlichen Hydrauliksystem zusammengefaßt werden kön¬ nen. Um dies zu erreichen, wird gemäß der Erfindung vorgeschlagen, daß der Hydraulikkreis des Rührwerkan¬ triebs und der Schmier- und Kühlölkreis des Schrauben¬ verdichters einen gemeinsamen Öltank aufweisen, der vorzugsweise durch den Ölsumpf des Öl/Luftbehälters ge¬ bildet ist. Eine weitere Vereinfachung in dieser Hin¬ sicht wird dadurch erzielt, daß der Hydraulikkreis und der Schmier- und Kühlölkreis auch einen gemeinsamen Ölfilter und/oder Ölkühler aufweisen.To achieve this object, the combination of features specified in claim 1 is proposed. Advantageous refinements and developments of the invention result from the subclaims. The solution according to the invention is based on the idea that the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor can be combined to form a uniform hydraulic system despite the fundamentally different tasks. In order to achieve this, it is proposed according to the invention that the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor have a common oil tank, which is preferably formed by the oil sump of the oil / air container. A further simplification in this respect is achieved in that the hydraulic circuit and the lubricating and cooling oil circuit also have a common oil filter and / or oil cooler.
Eine bevorzugte Ausgestaltung der Erfindung sieht vor, daß die Hydropumpe des Rührwerkantriebs saugseitig un¬ mittelbar oder über eine Vorverdichterpumpe mit Öl aus dem Ölsumpf des Öl/Luftbehälters des Schraubenverdich¬ ters beaufschlagbar ist. Bei Verwendung einer Vorver¬ dichterpumpe wird etwaige Luft, die im angesaugten Öl noch enthalten ist, abgeschieden, bevor das Öl der Hy¬ draulikpumpe zugeführt wird. Mit der Vorverdichterpumpe wird das Hydrauliköl auf beispielsweise 30 bar vorver¬ dichtet und dabei die in ihm enthaltende Luft abgeschie¬ den. Die abgeschiedene Luft kann über eine Druckluftlei¬ tung in den Öl/Luftbehälter zurückgeführt werden. Zur Verbesserung der Luftabscheidung kann im Öl/Luftbehäl¬ ter zusätzlich mindestens eine Luftabscheidestufe vor- gesehen werden, die aus Lochblechen bestehen kann, von denen auch mehrere hintereinander im Öl/Luftbehälter angeordnet werden können. Der Schraubenblock des Schrau¬ benverdichters kann entweder integrierter oder separa¬ ter Bestandteil des Öl/Luftbehälters sein.A preferred embodiment of the invention provides that the hydraulic pump of the agitator drive can be acted upon directly on the suction side or with oil from the oil sump of the oil / air container of the screw compressor via a pre-compressor pump. If a pre-compressor pump is used, any air that is still contained in the sucked-in oil is separated before the oil is fed to the hydraulic pump. With the pre-compressor pump, the hydraulic oil is pre-compressed to 30 bar, for example, and the air contained in it is separated off. The separated air can be returned to the oil / air tank via a compressed air line. To improve the air separation, at least one air separation stage can additionally be provided in the oil / air container. can be seen, which can consist of perforated plates, of which several can be arranged one behind the other in the oil / air tank. The screw block of the screw compressor can be either an integrated or a separate component of the oil / air container.
Für den Fall, daß das Hydrauliköl für die Antriebshy¬ draulik noch zu viel Luft enthalten sollte, können dem Hydrauliköl auch an sich bekannte Chemikalien zugesetzt werden, die dafür sorgen, daß die noch vorhandene Luft entfernt oder in geeigneter Weise gebunden wird. Ande¬ rerseits ist es auch denkbar, für den Antriebshydrau¬ likkreis luftresistente Hydraulikaggregate und Armatu¬ ren auszuwählen.In the event that the hydraulic oil for the drive hydraulics should still contain too much air, chemicals known per se can also be added to the hydraulic oil, which ensure that the air still present is removed or bound in a suitable manner. On the other hand, it is also conceivable to select air-resistant hydraulic units and armatures for the drive hydraulic circuit.
Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung ist der Hydromotor des Rührwerkantriebs rück- flußseitig über den Ölkühler und Ölfilter nach Art ei¬ ner Serienschaltung mit dem Schmier- und Oleintritt des Schraubeπverdichters verbunden.According to a further advantageous embodiment of the invention, the hydraulic motor of the agitator drive is connected on the return side via the oil cooler and oil filter in the manner of a series connection to the lubricant and oil inlet of the screw compressor.
Alternativ dazu kann der Hydromotor des Rührwerkantriebs unmittelbar oder mittelbar über den Ölfilter und/oder Ölkühler in den Öl/Luftbehälter münden, während der Schraubenverdichter unmittelbar oder mittelbar über ei¬ nen weiteren Ölkühler und/oder Ölfilter aus dem Ölsumpf des Öl/Luftbehälters mit Schmier- und Kühlöl beauf¬ schlagbar ist. Grundsätzlich ist es auch möglich, daß der Hydromotor des Rührwerkaπtriebs rückflußseitig un¬ mittelbar in den Öl/Luftbehälter mündet, während der Schraubenverdichter aus dem Ölsumpf des Öl/Luftbehäl¬ ters unter Zwischenschaltung des Ölfilters und/oder Ölkühlers mit Schmier- und Kühlöl beaufschlagbar ist.As an alternative, the hydraulic motor of the agitator drive can open directly or indirectly via the oil filter and / or oil cooler into the oil / air container, while the screw compressor directly or indirectly via a further oil cooler and / or oil filter from the oil sump of the oil / air container with lubricant. and cooling oil can be applied. In principle, it is also possible for the hydraulic motor of the agitator drive to open directly into the oil / air container on the return side, during the Screw compressor from the oil sump of the oil / air container with the interposition of the oil filter and / or oil cooler can be acted upon with lubricating and cooling oil.
Im folgenden wird die Erfindung anhand der in der Zeichnung in schematischer Weise dargestellten Ausfüh¬ rungsbeispiele näher erläutert. Es zeigenThe invention is explained in more detail below with reference to the exemplary embodiments shown schematically in the drawing. Show it
Fig. 1 ein hydraulisches Schaltschema eines Misch- und Druckluftfördergeräts;Figure 1 is a hydraulic circuit diagram of a mixing and compressed air conveyor.
Fig. 2 ein hydraulisches Schaltschema eines gegenüber Fig. 1 abgewandelten Misch- und Druckluftför¬ dergeräts ;FIG. 2 shows a hydraulic circuit diagram of a mixing and compressed-air conveying device modified compared to FIG. 1;
Fig. 3 ein hydraulisches Schaltschema eines weiteren, gegenüber Fig. 1 abgewandelten Misch- und Druck¬ luftfördergeräts.FIG. 3 shows a hydraulic circuit diagram of a further mixing and compressed air conveying device modified compared to FIG. 1.
Die in der Zeichnung schematisch dargestellten Misch- und Fördergeräte bestehen im wesentlichen aus einem über die verschließbare Eiπfüllöffπung 10 mit Mischgut beschickbaren, an eine Förderleitung 12 angeschlosse¬ nen, ein Rührwerk 14 enthaltenden und über die Öffnun¬ gen 16 mit Druckluft beaufschlagbaren Mischkessel 18, einem vorzugsweise als Dieselmotor ausgebildeten An¬ triebsmotor 20, einem durch den Antriebsmotor antreib¬ baren Schraubenkompressor 22 für die Erzeugung der Druckluft sowie zwei gemeinsam durch den Antriebsmotor 20 angetriebenen Hydropumpen 24,26, die über einen Hy- draulik-Steuerblock 28 einen Hydromotor 30 für den An¬ trieb des Rührwerks 14 mit Drucköl beaufschlagen. Der Schraubenkompressor 22 umfaßt einen Schraubenverdichter 32 und einen Öl/Luftbehälter 34 mit Druckluftabscheider 36 und Ölsumpf 38. Der Schraubenverdichter 32 ist saug- seitig über ein Luftfilter 40 und eine absperrbare Dros¬ selklappe 42 mit Atmosphärenluft und über eine Einspritz¬ leitung 44,44' mit Schmier- und Kühlöl beaufschlagbar. Das aus dem Schraubenverdichter unter einem Druck von 5 bis 7 bar austretende Öl/Luftgemisch gelangt über einen Kanal oder eine Leitung 46 in den Öl/Luftbehälter 34. Beim Fördervorgang gelangt Druckluft über den Luftab¬ scheider 36 und die Druckluftleitung 46 zu den Luftein- trittsöffnungeπ 16 und fördert das im Mischbehälter 18 befindliche Misch- und Fördergut propfenweise durch die Förderleitung 12 nach außen.The mixing and conveying devices shown schematically in the drawing essentially consist of a mixing vessel 18, which can be fed with mixed material via the closable filling opening 10, is connected to a conveying line 12, contains an agitator 14 and can be pressurized with compressed air via the openings 16 preferably designed as a diesel engine drive motor 20, a screw compressor 22 which can be driven by the drive motor for generating the compressed air, and two hydraulic pumps 24, 26 which are driven jointly by the drive motor 20 and which are driven by a hydraulic motor. Hydraulic control block 28 act on a hydraulic motor 30 for driving the agitator 14 with pressure oil. The screw compressor 22 comprises a screw compressor 32 and an oil / air container 34 with compressed air separator 36 and oil sump 38. The screw compressor 32 is on the suction side via an air filter 40 and a shut-off throttle valve 42 with atmospheric air and via an injection line 44, 44 '. can be loaded with lubricating and cooling oil. The oil / air mixture emerging from the screw compressor under a pressure of 5 to 7 bar reaches the oil / air container 34 via a channel or a line 46. During the conveying process, compressed air reaches the air inlet openings 36 via the air separator 36 and the compressed air line 46 16 and conveys the mixed and conveyed material located in the mixing container 18 in drops through the conveying line 12 to the outside.
Der zur Hydropumpe 30 führende Hydraulikkreis und der Schmier- und Kühlölkreis des Schraubenkompressors wer¬ den gemeinsam aus dem Ölsumpf 38 des Öl/Luftbehälters mit Öl versorgt. Ebenso ist nur ein Ölkühler 50 und ein Ölfilter 52 für beide Ölkreise vorgesehen.The hydraulic circuit leading to the hydraulic pump 30 and the lubricating and cooling oil circuit of the screw compressor are jointly supplied with oil from the oil sump 38 of the oil / air container. Likewise, only one oil cooler 50 and one oil filter 52 are provided for both oil circuits.
Bei dem in Fig. 1 gezeigten Ausführungsbeispiel ist die Niederdruckseite der Hydropumpen 24,26 unmittelbar über die Versorgungsleitung 54 mit dem Ölsumpf 38 verbunden, während bei dem Ausführungsbeispiel nach Fig. 2 in der Versorgungsleitung 54 eine Vorverdichterpumpe 56 ange¬ ordnet ist, in der das Öl aus dem Ölsumpf 38 auf einen Druck von ca. 30 bar vorverdichtet und dabei von der darin noch enthaltenen Luft befreit wird. Die im Vor¬ verdichter 36 abgeschiedene Druckluft wird über die Leitung 58 in den Öl/Luftbehälter zurückgeführt.In the embodiment shown in FIG. 1, the low-pressure side of the hydraulic pumps 24, 26 is connected directly to the oil sump 38 via the supply line 54, while in the embodiment according to FIG. 2 a pre-compressor pump 56 is arranged in the supply line 54, in which the Pre-compressed oil from the oil sump 38 to a pressure of approx. 30 bar and thereby from the air contained therein is freed. The compressed air separated in the pre-compressor 36 is returned to the oil / air tank via line 58.
Ein weiterer Unterschied zwischen den beiden Ausfüh¬ rungsbeispielen besteht darin, daß das über die Rück¬ laufleitung 48, den Kühler 50 und den Filter 52 ankom¬ mende Öl im Falle der Fig. 1 über die Leitung 44 zur Öleinspritzstelle des Schraubenverdichters 32 und im Falle der Fig. 2 in den Ölsumpf 38 des Öl/Luftbehälters geleitet wird. Im letzteren Falle ist die zum Schrau¬ benverdichter führende Öleinspritzleitung 44' unmittel¬ bar vom Ölsumpf 38 des Öl/Luftbehälters 34 abgezweigt. 'Another difference between the two exemplary embodiments is that the oil arriving via the return line 48, the cooler 50 and the filter 52 in the case of FIG. 1 via the line 44 to the oil injection point of the screw compressor 32 and in the case 2 is passed into the oil sump 38 of the oil / air container. In the latter case, the oil injection line 44 'leading to the screw compressor is branched off directly from the oil sump 38 of the oil / air container 34. '
Bei dem in Fig. 3 gezeigten Ausführungsbeispiel ist in der vom Ölsumpf 38 abgezweigten Öleinspritzleitung 44' zusätzlich ein Kühler 50' und ein Ölfilter 52' angeord¬ net .In the exemplary embodiment shown in FIG. 3, a cooler 50 'and an oil filter 52' are additionally arranged in the oil injection line 44 'branched off from the oil sump 38'.
Um zu gewährleisten, daß aus dem Ölsumpf weitgehend gasfreies Öl abgezweigt wird, ist der Ölsumpf durch ei¬ nen Luftabscheider 64 oder eine Schottwand in eine Ein¬ gangszone 60 und eine Ausgangszoπe 62 unterteilt. Da¬ durch wird erreicht, daß das über die Leitungen 46 und 48 in den Öl/Luftbehälter gelangende, luftbeladene Öl am Luftabscheidesieb 64 bzw. der Schottwand entgast wird, so daß die Ausgangszone 62, an die die Leitungen 44,44' und 54 angeschlossen sind, weitgehend gasfreies Öl enthält. Zusammenfassend ist folgendes festzustellen: Die Erfin¬ dung bezieht sich auf ein Misch- und Druckluftförderge¬ rät, insbesondere für Mörtel oder Beton als Misch- und Fördergut, mit einem mit dem Misch- und Fördergut be¬ schickbaren, an eine Förderleitung 12 angeschlossenen, ein motorisch angetriebenes Rührwerk 14 enthaltenden und mit Druckluft beaufschlagbaren Mischkessel 18, ei¬ nem Antriebsmotor 20 und einem durch den Antriebsmotor antreibbaren Schraubenverdichter 32 für die Erzeugung der Druckluft. Das Rührwerk ist mittels eines Hydromo¬ tors 30 antreibbar, der über mindestens eine durch den Antriebsmotor 20 angetriebene Hydropumpe 24,26 mit Drucköl beaufschlagbar ist. Der Schraubenverdichter 32 ist in einem einen Öl/Luftbehälter 34 mit Luftabschei¬ der 36 und Ölsumpf 38 enthaltenden Schmier- und Kühlöl¬ kreis angeordnet. Um eine leichte Bauweise und eine einfache Montage und Wartung zu gewährleisten, weisen der Hydraulikkreis des Rührwerkaπtriebs und der Schmier- und Kühlölkreis des Schraubenverdichters 32 einen ge¬ meinsamen, durch den Ölsumpf 38 des Öl/Luftbehälters gebildeten Öltank sowie einen gemeinsamen Ölkühler 50 und Ölfilter 52 auf. In order to ensure that largely gas-free oil is branched off from the oil sump, the oil sump is divided by an air separator 64 or a bulkhead into an entrance zone 60 and an exit zone 62. Thereby it is achieved that the air-laden oil coming into the oil / air container via the lines 46 and 48 is degassed at the air separating screen 64 or the bulkhead so that the exit zone 62 to which the lines 44, 44 'and 54 are connected are largely gas-free oil. In summary, the following can be stated: The invention relates to a mixing and compressed air conveying device, in particular for mortar or concrete as mixed and conveyed material, with a material which can be mixed with the mixed and conveyed material and is connected to a conveying line 12 Motor-driven agitator 14 containing and can be pressurized with compressed air mixing vessel 18, a drive motor 20 and a screw compressor 32 which can be driven by the drive motor for generating the compressed air. The agitator can be driven by means of a hydraulic motor 30 which can be pressurized with pressure oil via at least one hydraulic pump 24, 26 driven by the drive motor 20. The screw compressor 32 is arranged in a lubricating and cooling oil circuit containing an oil / air container 34 with an air separator 36 and an oil sump 38. In order to ensure a lightweight construction and simple assembly and maintenance, the hydraulic circuit of the agitator drive and the lubricating and cooling oil circuit of the screw compressor 32 have a common oil tank formed by the oil sump 38 of the oil / air container and a common oil cooler 50 and oil filter 52 on.

Claims

Patentansprüche Claims
1. Misch- und Druckluftfördergerät, insbesondere für Mörtel oder Beton als Misch- und Fördergut mit ei¬ nem mit dem Misch- und Fördergut beschickbaren, an eine Förderleitung (12) angeschlossenen, ein moto¬ risch angetriebenes Rührwerk (14) enthaltenden und mit Druckluft (16,46) beaufschlagbaren Mischkessel, einem Antriebsmotor (20) und einem durch den An¬ triebsmotor antreibbaren Schraubenverdichter (32) für die Erzeugung der Druckluft, wobei das Rührwerk (14) mittels eines Hydromotors (30) antreibbar ist, der über mindestens eine durch den Antriebsmotor (20) angetriebene Hydropumpe mit Drucköl beauf¬ schlagbar und zusammen mit diesem in einem einen Öltank (38) , einen Ölkühler (50) und einen Ölfilter (52) enthaltenden Hydraulikkreis angeordnet ist, und wobei der Schraubenverdichter (32) in einem ei¬ nen Öl/Luftbehälter (34) mit Luftabscheider (36) und Ölsumpf (38) , einen Ölkühler (50) und einen Öl¬ filter (52) enthaltenden Schmier- und Kühlölkreis angeordnet ist, dadurch gekennzeichnet, daß der Hy¬ draulikkreis (24,26,28,30) des Rührwerkantriebs und der Schmier- und Kühlölkreis des Schraubenverdich¬ ters (32) einen gemeinsamen, durch den Ölsumpf (38) des Öl/Luftbehälters (34) gebildeten Öltank aufwei¬ sen .1. Mixing and compressed air conveying device, in particular for mortar or concrete as mixing and conveying material with a feedable with the mixing and conveying material, connected to a conveying line (12), containing a motor-driven agitator (14) and containing compressed air (16,46) acted upon mixing vessel, a drive motor (20) and a screw compressor (32) which can be driven by the drive motor for generating the compressed air, the agitator (14) being drivable by means of a hydraulic motor (30) which is driven by at least one hydraulic pump driven by the drive motor (20) can be pressurized with pressurized oil and is arranged together with the latter in a hydraulic circuit containing an oil tank (38), an oil cooler (50) and an oil filter (52), and the screw compressor (32) in one ei¬ nen oil / air tank (34) with air separator (36) and oil sump (38), an oil cooler (50) and an oil filter (52) containing lubricating and cooling oil circuit dnet, characterized in that the hydraulic circuit (24, 26, 28, 30) of the agitator drive and the lubricating and cooling oil circuit of the screw compressor (32) have a common one, through the oil sump (38) of the oil / air container (34 ) formed oil tank.
2. Misch- und Druckluftfördergerät nach Anspruch 1, dadurch gekennzeichnet, daß der Hydraulikkreis (24, 26,28,30) des Rührwerkantriebs und der Schmier- und Kühlölkreis des Schraubenverdichters (32) einen ge¬ meinsamen Ölkühler (50) und/oder Ölfilter (52) auf¬ weisen.2. Mixing and compressed air delivery device according to claim 1, characterized in that the hydraulic circuit (24, 26, 28, 30) of the agitator drive and the lubricating and cooling oil circuit of the screw compressor (32) have a common oil cooler (50) and / or oil filter (52).
3. Misch- und Druckluftfördergerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Hydropumpe (24,26) des Rührwerkantriebs saugseitig unmittelbar oder über eine Vorverdichterpumpe (56) mit Öl aus dem Ölsumpf (38) des Öl/Luftbehälters des Schrau¬ benverdichters (32) beaufschlagbar ist.3. Mixing and compressed air delivery device according to claim 1 or 2, characterized in that the hydraulic pump (24, 26) of the agitator drive on the suction side or directly via a pre-compressor pump (56) with oil from the oil sump (38) of the oil / air tank of the screw compressor (32) can be acted upon.
4. Misch- und Druckluftfördergerät nach Anspruch 3, dadurch gekennzeichnet, daß die Vorverdichterpumpe (56) einen Luftabscheider mit einer in den Öl/Luft¬ behälter (34) zurückgeführten Druckluftleitung (58) aufweist.4. Mixing and compressed air delivery device according to claim 3, characterized in that the pre-compressor pump (56) has an air separator with an in the oil / Luft¬ container (34) returned compressed air line (58).
5. Misch- und Druckluftfördergerät nach einem der An¬ sprüche 1 bis 4, dadurch gekennzeichnet, daß der Hydromotor (30) des Rührwerkantriebs ruckflußseitig über den Ölkühler (50) und den Ölfilter (52) mit dem Schmier- und Kühlöleintritt des Schraubenver¬ dichters (32) verbunden ist.5. Mixing and compressed air delivery device according to one of claims 1 to 4, characterized in that the hydraulic motor (30) of the agitator drive on the return side via the oil cooler (50) and the oil filter (52) with the lubricating and cooling oil inlet of the screw compressor (32) is connected.
Misch- und Druckluftfördergerät nach einem der An¬ sprüche 1 bis 4, dadurch gekennzeichnet, daß der Hydromotor (30) des Rührwerkantriebs ruckflußseitig unmittelbar oder mittelbar über den Ölkühler (50) und/oder den Ölfilter (52) in den Öl/Luftbehälter (34) mündet und daß der Schraubenverdichter (32) unmittelbar oder mittelbar über einen weiteren Öl¬ kühler und/oder Ölfilter aus dem Ölsumpf (38) des Öl/Luftbehälters (34) mit Schmier- und Kühlöl be¬ aufschlagbar ist.Mixing and compressed air delivery device according to one of claims 1 to 4, characterized in that the hydraulic motor (30) of the agitator drive on the return side directly or indirectly via the oil cooler (50) and / or the oil filter (52) into the oil / air container (34) opens and that the screw compressor (32) can be loaded with lubricating and cooling oil directly or indirectly via a further oil cooler and / or oil filter from the oil sump (38) of the oil / air container (34).
7. Misch- und Fördergerät nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Ölsumpf (38) des Öl/Luftbehälters (34) in eine Eingangszoπe (60) mit gasbeladenem Öl und eine Ausgangszone (62) mit entgastem Öl unterteilt ist.7. Mixing and conveying device according to one of claims 1 to 6, characterized in that the oil sump (38) of the oil / air container (34) is divided into an input gas (60) with gas-laden oil and an output zone (62) with degassed oil .
8. Misch- und Fördergerät nach Anspruch 7, dadurch ge¬ kennzeichnet, daß die Eingangszone (60) und die Ausgangszone (62) durch ein in den Ölsumpf eintau¬ chendes Luftabscheidesieb (64) oder eine entspre¬ chende Schottwand flüssigkeitsdurchlässig vonein¬ ander getrennt sind. 8. Mixing and conveying device according to claim 7, characterized in that the inlet zone (60) and the outlet zone (62) are separated from one another in a liquid-permeable manner by an air separating sieve (64) immersing in the oil sump or a corresponding bulkhead are.
PCT/EP1993/000764 1992-04-03 1993-03-30 Pneumatic mixer and conveyor WO1993019914A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59303765T DE59303765D1 (en) 1992-04-03 1993-03-30 MIXED AND COMPRESSED AIR CONVEYOR
EP93907853A EP0633831B1 (en) 1992-04-03 1993-03-30 Pneumatic mixer and conveyor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4211139A DE4211139A1 (en) 1992-04-03 1992-04-03 Mixing and compressed air conveyor
DEP4211139.0 1992-04-03

Publications (1)

Publication Number Publication Date
WO1993019914A1 true WO1993019914A1 (en) 1993-10-14

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EP (1) EP0633831B1 (en)
AT (1) ATE142553T1 (en)
DE (2) DE4211139A1 (en)
WO (1) WO1993019914A1 (en)

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ES2266028T3 (en) 2000-01-27 2007-03-01 Kaeser Kompressoren Gmbh PROCESS AND APPLIANCE FOR MIXING AND UNLOADING CONCRETE.
JP5649177B2 (en) * 2011-03-24 2015-01-07 カヤバ工業株式会社 Mixer drum drive device
CN103174652B (en) * 2013-03-09 2015-08-12 宁德市优力维特电梯配件有限公司 A kind of screw air compressor and supporting rare-earth permanent-magnet electric machine thereof
CN106738317A (en) * 2016-12-13 2017-05-31 顾广才 A kind of high-efficiency cement agitating device
DE102017104780A1 (en) 2017-03-07 2018-09-13 Putzmeister Engineering Gmbh Pressure-free mixer with conveyor

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EP0367912A1 (en) * 1988-10-29 1990-05-16 Putzmeister-Werk Maschinenfabrik Gmbh Mixing and feeding device using compressed air

Also Published As

Publication number Publication date
EP0633831B1 (en) 1996-09-11
EP0633831A1 (en) 1995-01-18
DE59303765D1 (en) 1996-10-17
ATE142553T1 (en) 1996-09-15
DE4211139A1 (en) 1993-10-07

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