EP0642900B1 - Vehicle mounted mixer for flowable medium such as concrete - Google Patents
Vehicle mounted mixer for flowable medium such as concrete Download PDFInfo
- Publication number
- EP0642900B1 EP0642900B1 EP93107243A EP93107243A EP0642900B1 EP 0642900 B1 EP0642900 B1 EP 0642900B1 EP 93107243 A EP93107243 A EP 93107243A EP 93107243 A EP93107243 A EP 93107243A EP 0642900 B1 EP0642900 B1 EP 0642900B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- bearing
- vehicle
- running ring
- yoke
- 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.)
- Expired - Lifetime
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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
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4234—Charge or discharge systems therefor
- B28C5/4237—Charging, e.g. hoppers
Definitions
- the invention relates to a vehicle mixer for flowable media, such as concrete, with a mixing drum, which has on its outer circumference a tread that is rotatably supported by rollers of a structure of the vehicle frame and which is assigned a tailgate with a hopper attached to it, the tailgate around a stationary pivot bearing is pivotally mounted above the drum and can be pivoted by means of an actuating device between a closed position that closes the drum mouth by means of a ring seal and an open position, and the pivot bearing and the actuating device are arranged on a support frame.
- Such a vehicle mixer is known from EP-A-0374681.
- the support frame is attached to the structure of the vehicle frame.
- the inevitable twisting of the vehicle frame leads to the fact that the frame-fixed support frame causes a displacement of the tailgate, with the result that the ring seal of the tailgate loses its contact with the ring flange of the drum mouth, so that in particular low-viscosity concrete can escape from the drum.
- the negative effect in road traffic accidents is even greater if the vehicle collides with another or the entire vehicle tips over. Due to the deformation of the frame, the tailgate, which is in its closed position, is lifted off the drum mouth, so that the drum contents can leak out.
- US-A-2,572,058 also shows a vehicle mixer, which, however, has no tailgate for the drum mouth and also no pivot bearing for the tailgate.
- An input trough connects flush with the drum mouth.
- the trough is attached to a bearing plate, which is rotatably supported by 4 rollers on a race of the drum.
- a ring seal is provided between the mounting plate and the drum mouth.
- the trough In the loading position, the trough is open at the top.
- Anti-rotation protection ensures that the trough rotates when the drum is turned. To empty the drum, the anti-rotation protection is released so that the trough can be rotated through 180 ° into an emptying position in which the anti-rotation protection is reactivated.
- the object of the invention is to improve a vehicle mixer of the type mentioned in such a way that deformations of the vehicle frame have as little effect as possible on the seal between the tailgate and the drum mouth of the mixing drum.
- the new vehicle mixer differs from the prior art in that the support frame is non-rotatably mounted on the mixing drum. Thanks to the invention, the seal between the tailgate and the drum mouth is independent of twisting of the vehicle frame. The ring seal on the tailgate maintains its defined position to the drum mouth even if the vehicle frame warps in the event of an accident. The tailgate therefore closes the drum mouth under all normal operating conditions of the vehicle mixer and even in exceptional cases.
- the embodiment of the invention consists in that the support frame has a bearing yoke suspended on the running ring of the drum or an auxiliary running ring arranged between it and the drum mouth.
- the bearing yoke can be U-shaped or horseshoe-shaped, house-shaped, that is, be formed with two parallel vertical legs and two inclined roof legs, just as a rhombic shape is possible.
- the bearing yoke can, but need not, be designed as a closed ring.
- An embodiment is preferred in which the bearing yoke encompasses the running or auxiliary running ring at least along its half circumference, preferably over 2/3 of the circumference.
- a further embodiment of the invention consists in that the bearing yoke is curved in a circular arc at least along part of its circumference in accordance with the curvature of the bearing or auxiliary race supporting the bearing yoke.
- the bearing yoke of the support frame has at least two circumferentially spaced bearing points, each of which is equipped with rollers for axial and radial guidance.
- the anti-rotation protection of the support frame can, in the simplest case, consist of the support frame having a low center of gravity, that is to say which is far below the axis of rotation of the drum, so that it is prevented from rotating when the drum rotates without further aids.
- a mechanical connection of the support frame or its bearing yoke to the structure of the vehicle frame is preferred.
- This mechanical connection can consist of two-sided stops on the structure of the vehicle frame, so that the support frame or its bearing yoke each hits one of the stops according to the direction of rotation of the drum.
- An alternative solution consists in a handlebar arrangement which articulates the support frame or its bearing yoke with the structure of the vehicle frame. This handlebar arrangement only needs to be provided on one side of the drum and, like the stop version described above, ensures that it is prevented from rotating, without mechanical deformations of the frame structure being transmitted to the supporting frame.
- the bearing yoke is designed as an annular ring open at the bottom, the two ends of which are arranged at least approximately at the same level in the lower half of the drum, the bearing yoke at or near the ends each has lower bearing point on the running or auxiliary running ring and at least one further upper bearing point in the maximum area of the running ring.
- Two of the three bearing points then preferably have a circumferential distance of 120 °.
- the invention proposes two alternative solutions for reducing or compensating of the torque acting on the bearing yoke.
- one embodiment of the invention consists in that an adjustment device is assigned to this pivot bearing. With this adjustment device, in particular the axial distance of the tailgate from the drum mouth can be adjusted.
- a mixing drum 10 is rotatably supported at the rear on a structure 12 of a vehicle frame (not shown) by means of a running ring 14 and support rollers 16.
- the mixing drum 10 has a rear drum mouth 18, which can be closed by a tailgate 20.
- An annular seal 22 is adjustably fastened to the tailgate 20 and, in the closed position of the tailgate 20, bears against an annular flange 24 of the drum 10 in the plane of the drum mouth 18.
- a feed hopper 26 is attached, which passes through the tailgate 20 and projects into the interior of the drum 10.
- the bearing yoke 32 is circular in cross section and extends over a drum circumference angle of slightly more than 240 °.
- the two lower ends of the bearing yoke 32 are at the same level in the lower half of the drum.
- the bearing yoke 32 has three bearing points, namely two lower bearing points 34 near the lower ends of the bearing yoke 32 and a central upper bearing point 36. With these three bearings 34, 34, 36, the bearing yoke 32 is relatively rotatably mounted on the auxiliary race 28.
- an anti-rotation protection 38 in the form of a link is articulated to one end of the bearing yoke 32, the other end of which is connected in an articulated manner to a strut of the vehicle frame structure 12 carrying the outlet chute of the vehicle mixer.
- the design and position of a handlebar as anti-rotation protection is only shown for example. This handlebar can advantageously also be inclined. It is important that any deformations of the vehicle frame are not transmitted to the bearing yoke 32 via the mechanical connection 38.
- the support frame 30 has two arms 40 fastened to the bearing yoke 32, which are connected to one another by a crosshead 42 and which are stiffened to the bearing yoke 32 via struts 44.
- the support frame 30 further comprises a pivot bearing 46 for the tailgate 20, two straps 48 extending rearward from the top of the bearing yoke 32, which are pivotally connected to sliding straps 50 which in turn are attached to the tailgate 20 by means of an elongated hole connection. Due to this slot connection 52, the axial distance of the tailgate 20 from the pivot bearing 46 can be adjusted.
- an actuating device 54 in the form of a hydraulic cylinder which acts on the feed hopper 26 in order to pivot it together with the tailgate 20 about the pivot bearing 46 into the dash-dotted line.
- the embodiment according to FIGS. 3 and 4 differs from the previously described embodiment mainly only in that the auxiliary race 28 is omitted and the main race 14 for the rear-side drum mounting carries the bearing yoke 32 of the support frame 30. Since the tread 14 has a greater distance from the drum mouth 18 than the auxiliary tread 32 According to FIGS. 1 and 2, a greater moment load acts on the bearing yoke 32, which in the embodiment according to FIGS. 3 and 4 is at least largely compensated for by counterweights 56 attached to the bearing yoke 32 on both sides. These counterweights 56 are preferably attached to extension arms of the bearing yoke 32 which extend towards the bow side in order to increase the compensating torque.
- the bearing points 34, 36 for both of the above-described embodiments have, according to FIG. 5 each have two guide rollers 58 with axes radial to the mixing drum 10. These two rollers 58 run on the side surfaces of the race 14 or auxiliary race 28 and are responsible for the axial position of the bearing yoke 32.
- Another roller 60 with an axis parallel to the drum axis runs on the outer circumferential surface of the race 14 and 28 and effects the radial mounting of the bearing yoke 32.
- FIGURE 6 illustrates an alternative embodiment of the bearing points 34, 36 of the bearing yoke 32, which have a double flange roller 62 instead of the three rollers 58, 58, 60 according to FIG. 5 used.
- the tread 28 is then roof-shaped in cross section with two flanks arranged at an angle to one another.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
Die Erfindung betrifft einen Fahrzeugmischer für fließfähige Medien, wie Beton, mit einer Mischtrommel, die an ihrem Außenumfang einen Laufkranz aufweist, der von Rollen eines Aufbaus des Fahrzeugrahmens drehbar abgestützt ist und der eine Heckklappe mit an dieser befestigtem Aufgabetrichter zugeordnet ist, wobei die Heckklappe um ein stationäres Schwenklager oberhalb der Trommel schwenkbar gelagert und mittels einer Stelleinrichtung zwischen einer, den Trommelmund mittels einer Ringdichtung abschließenden Schließstellung und einer Offenstellung verschwenkbar ist, und wobei das Schwenklager und die Stelleinrichtung an einem Traggestell angeordnet sind.The invention relates to a vehicle mixer for flowable media, such as concrete, with a mixing drum, which has on its outer circumference a tread that is rotatably supported by rollers of a structure of the vehicle frame and which is assigned a tailgate with a hopper attached to it, the tailgate around a stationary pivot bearing is pivotally mounted above the drum and can be pivoted by means of an actuating device between a closed position that closes the drum mouth by means of a ring seal and an open position, and the pivot bearing and the actuating device are arranged on a support frame.
Ein derartiger Fahrzeugmischer ist aus der EP-A-0374681 bekannt. Bei diesem bekannten Fahrzeugmischer ist das Traggestell am Aufbau des Fahrzeugrahmens befestigt. Die unvermeidlichen Verwindungen des Fahrzeugrahmens führen dazu, daß das rahmenfeste Traggestell eine Verlagerung der Heckklappe bewirkt, mit der Folge, daß die Ringdichtung der Heckklappe ihre Anlage am Ringflansch des Trommelmundes verliert, sodaß insbesondere dünnflüssiger Beton aus der Trommel austreten kann. Noch größer ist der negative Effekt bei Unfällen im Straßenverkehr, wenn das Fahrzeug mit einem anderen zusammenstößt oder das gesamte Fahrzeug gar umkippt. Aufgrund der Rahmenverformung wird die in ihrer Schließstellung befindliche Heckklappe vom Trommelmund abgehoben, sodaß der Trommelinhalt auslaufen kann.Such a vehicle mixer is known from EP-A-0374681. In this known vehicle mixer, the support frame is attached to the structure of the vehicle frame. The inevitable twisting of the vehicle frame leads to the fact that the frame-fixed support frame causes a displacement of the tailgate, with the result that the ring seal of the tailgate loses its contact with the ring flange of the drum mouth, so that in particular low-viscosity concrete can escape from the drum. The negative effect in road traffic accidents is even greater if the vehicle collides with another or the entire vehicle tips over. Due to the deformation of the frame, the tailgate, which is in its closed position, is lifted off the drum mouth, so that the drum contents can leak out.
Die US-A-2,572,058 zeigt ebenfalls einen Fahrzeugmischer, der jedoch keine Heckklappe für den Trommelmund und auch kein Schwenklager für die Heckklappe aufweist. Eine Eingabemulde schließt umfangsbündig an den Trommelmund an. Die Mulde ist an einer Lagerplatte befestigt, die mittels 4 Rollen auf einem Laufring der Trommel koaxial drehbar gelagert ist. Zwischen der Montageplatte und dem Trommelmund ist eine Ringdichtung vorgesehen. In der Beladestellung ist die Mulde nach oben geöffnet. Ein Drehverhinderungsschutz sorgt dafür, daß bei Drehen der Trommel die Mulde mitdreht. Zum Entleeren der Trommel wird der Drehverhinderungsschutz gelöst, sodaß die Mulde um 180° in eine Entleerungsstellung gedreht werden kann, in der der Drehverhinderungsschutz erneut aktiviert wird.US-A-2,572,058 also shows a vehicle mixer, which, however, has no tailgate for the drum mouth and also no pivot bearing for the tailgate. An input trough connects flush with the drum mouth. The trough is attached to a bearing plate, which is rotatably supported by 4 rollers on a race of the drum. A ring seal is provided between the mounting plate and the drum mouth. In the loading position, the trough is open at the top. Anti-rotation protection ensures that the trough rotates when the drum is turned. To empty the drum, the anti-rotation protection is released so that the trough can be rotated through 180 ° into an emptying position in which the anti-rotation protection is reactivated.
Zwar zeigt dieser weitere Stand der Technik die relativ drehbare Lagerung der Aufgabemulde an der Trommel, jedoch dient diese Lagerung erkennbar nur dem Zweck, die Aufgabemulde auch als Entleerungsmulde in einer um 180° gedrehten Stellung zu verwenden. Hinsichtlich Abdichtungsproblemen aufgrund von Rahmenverwindungen des Fahrzeuges sagt dieses Dokument nichts aus.Although this further state of the art shows the relatively rotatable mounting of the feed trough on the drum, this mounting is recognizable only for the purpose of also using the feed trough as an emptying trough in a position rotated by 180 °. This document says nothing about sealing problems due to twisting of the frame of the vehicle.
Aufgabe der Erfindung ist es, einen Fahrzeugmischer der eingangs genannten Art dahingehend zu verbessern, daß Verformungen des Fahrzeugrahmens sich möglichst wenig auf die Abdichtung zwischen Heckklappe und Trommelmund der Mischtrommel auswirken.The object of the invention is to improve a vehicle mixer of the type mentioned in such a way that deformations of the vehicle frame have as little effect as possible on the seal between the tailgate and the drum mouth of the mixing drum.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.
Der neue Fahrzeugmischer unterscheidet sich also vom Stand der Technik dadurch, daß das Traggestell an der Mischtrommel undrehbar gelagert ist. Dank der Erfindung ist die Abdichtung zwischen Heckklappe und Trommelmund von Verwindungen des Fahrzeugrahmens unabhängig. Die Ringdichtung an der Heckklappe behält ihre definierte Lage zum Trommelmund sogar dann bei, wenn sich der Fahrzeugrahmen bei einem Unfall verzieht. Die Heckklappe verschließt also den Trommelmund unter allen gewöhnlichen Betriebsbedingungen des Fahrzeugmischers und sogar in außergewöhnlichen Fällen.The new vehicle mixer differs from the prior art in that the support frame is non-rotatably mounted on the mixing drum. Thanks to the invention, the seal between the tailgate and the drum mouth is independent of twisting of the vehicle frame. The ring seal on the tailgate maintains its defined position to the drum mouth even if the vehicle frame warps in the event of an accident. The tailgate therefore closes the drum mouth under all normal operating conditions of the vehicle mixer and even in exceptional cases.
Die Ausgestaltung der Erfindung besteht darin, daß das Traggestell ein, auf dem Laufkranz der Trommel oder einem zwischen diesem und dem Trommelmund angeordneten Hilfslaufkranz aufgehängtes Lagerjoch aufweist. Verschiedene Formen des Lagerjoches liegen im Rahmen der Erfindung. Das Lagerjoch kann zum Beispiel U-oder hufeisenförmig, hausförmig, d.h. mit zwei parallelen Vertikalschenkeln und zwei geneigten Dachschenkeln ausgebildet sein, genauso, wie eine rhombische Gestalt in Frage kommt. Das Lagerjoch kann, muß aber nicht, als geschlossener Ring ausgebildet sein. Bevorzugt wird eine Ausbildung, bei der das Lagerjoch den Lauf- bzw. Hilfslaufkranz mindestens längs dessen halben Umfanges, vorzugsweise über 2/3 des Umfanges umgreift. Dabei besteht eine weitere Ausgestaltung der Erfindung darin, daß das Lagerjoch wenigstens längs eines Teils seines Umfanges kreisbogenförmig entsprechend der Krümmung des das Lagerjoch abstützenden Lauf- bzw. Hilfslaufringes gekrümmt ist.The embodiment of the invention consists in that the support frame has a bearing yoke suspended on the running ring of the drum or an auxiliary running ring arranged between it and the drum mouth. Various forms of the bearing yoke are within the scope of the invention. The bearing yoke can be U-shaped or horseshoe-shaped, house-shaped, that is, be formed with two parallel vertical legs and two inclined roof legs, just as a rhombic shape is possible. The bearing yoke can, but need not, be designed as a closed ring. An embodiment is preferred in which the bearing yoke encompasses the running or auxiliary running ring at least along its half circumference, preferably over 2/3 of the circumference. A further embodiment of the invention consists in that the bearing yoke is curved in a circular arc at least along part of its circumference in accordance with the curvature of the bearing or auxiliary race supporting the bearing yoke.
Das Lagerjoch des Traggestells weist mindestens zwei umfangsmäßig beabstandete Lagerstellen auf, welche je mit Rollen zur Axial- und Radialführung ausgestattet sind.The bearing yoke of the support frame has at least two circumferentially spaced bearing points, each of which is equipped with rollers for axial and radial guidance.
Der Drehverhinderungsschutz des Traggestells kann im einfachsten Fall darin bestehen, daß das Traggestell einen tiefliegenden, d.h. weit unter der Trommeldrehachse liegenden Massenschwerpunkt aufweist, sodaß es ohne weitere Hilfsmittel bei Drehung der Trommel an einem Mitdrehen gehindert ist. Zur Gewichtseinsparung wird jedoch eine mechanische Verbindung des Traggestells bzw. dessen Lagerjochs am Aufbau des Fahrzeugrahmens vorgezogen. Diese mechanische Verbindung kann aus beidseitigen Anschlägen am Aufbau des Fahrzeugrahmens bestehen, sodaß das Traggestell bzw. sein Lagerjoch je nach Drehrichtung der Trommel an einem der Anschläge anstößt. Eine alternative Lösung besteht in einer Lenkeranordnung, die das Traggestell bzw. dessen Lagerjoch mit dem Aufbau des Fahrzeugrahmens gelenkig verbindet. Diese Lenkeranordnung braucht nur an einer Seite der Trommel vorgesehen zu werden und gewährleistet - genauso wie die vorbeschriebene Anschlagversion - eine Mitdrehverhinderung, ohne daß mechanische Verformungen des Rahmenaufbaus auf das Traggestell übertragen werden.The anti-rotation protection of the support frame can, in the simplest case, consist of the support frame having a low center of gravity, that is to say which is far below the axis of rotation of the drum, so that it is prevented from rotating when the drum rotates without further aids. To save weight, however, a mechanical connection of the support frame or its bearing yoke to the structure of the vehicle frame is preferred. This mechanical connection can consist of two-sided stops on the structure of the vehicle frame, so that the support frame or its bearing yoke each hits one of the stops according to the direction of rotation of the drum. An alternative solution consists in a handlebar arrangement which articulates the support frame or its bearing yoke with the structure of the vehicle frame. This handlebar arrangement only needs to be provided on one side of the drum and, like the stop version described above, ensures that it is prevented from rotating, without mechanical deformations of the frame structure being transmitted to the supporting frame.
Für die Praxis als besonders geeignet hat sich eine Weiterbildung der Erfindung herausgestellt, bei der das Lagerjoch als unten offener Kreisring ausgebildet ist, dessen beide Enden wenigstens angenähert auf gleichem Niveau in der unteren Trommelhälfte angeordnet sind, wobei das Lagerjoch an oder nahe der Enden je eine untere Lagerstelle am Lauf- bzw. Hilfslaufkranz und mindestens eine weitere obere Lagerstelle im Höchstbereich des Laufkranzes aufweist. Jeweils zwei der drei Lagerstellen haben dann vorzugsweise einen Umfangsabstand von 120°.A further development of the invention has been found to be particularly suitable in practice, in which the bearing yoke is designed as an annular ring open at the bottom, the two ends of which are arranged at least approximately at the same level in the lower half of the drum, the bearing yoke at or near the ends each has lower bearing point on the running or auxiliary running ring and at least one further upper bearing point in the maximum area of the running ring. Two of the three bearing points then preferably have a circumferential distance of 120 °.
Da das Traggestell sich vom Lagerjoch ausschließlich nach hinten erstreckt und durch die Heckklappe mit Trichter zusätzlich belastet ist, wirkt auf das Lagerjoch ein erhebliches Drehmoment, insbesondere, wenn der Laufkranz der Trommel vom Trommelmund einen erheblichen Abstand hat. Die Erfindung schlägt zwei alternative Lösungen zur Verringerung bzw. Kompensierung des, auf das Lagerjoch wirkenden Drehmomentes, vor. Entweder wird zusätzlich zu dem vorhandenen Trommellaufring ein Hilfslaufring mit geringem axialen Abstand vom Trommelmund angeordnet oder am Traggestell wird ein von der Lagerstelle zur Bugseite hin vorstehendes Gegengewicht befestigt. Mit diesem Gegengewicht kann erreicht werden, daß die Drehmomentbelastung des Lagerjoches sehr klein wird. Es versteht sich, daß ein derartiges, nach vorn auskragendes Gegengewicht des Traggestells auch bei Verwendung eines Hilfslaufringes an der Trommel eingesetzt werden kann. Eine einwandfreie Abdichtung der Heckklappe am Trommelmund setzt eine genaue Position des Schwenklagers voraus. Um hier Justierungen vornehmen zu können, besteht eine Ausgestaltung der Erfindung darin, daß diesem Schwenklager eine Verstelleinrichtung zugeordnet ist. Mit dieser Verstelleinrichtung kann insbesondere der axiale Abstand der Heckklappe vom Trommelmund einjustiert werden.Since the support frame extends from the bearing yoke only to the rear and is additionally loaded by the tailgate with a funnel, a considerable torque acts on the bearing yoke, in particular if the rim of the drum has a considerable distance from the drum mouth. The invention proposes two alternative solutions for reducing or compensating of the torque acting on the bearing yoke. Either an auxiliary race with a small axial distance from the drum mouth is arranged in addition to the existing drum race, or a counterweight protruding from the bearing point to the bow side is attached to the support frame. With this counterweight it can be achieved that the torque load on the bearing yoke becomes very small. It goes without saying that such a forwardly projecting counterweight of the supporting frame can also be used on the drum when an auxiliary race is used. A perfect sealing of the tailgate on the drum mouth requires an exact position of the pivot bearing. In order to be able to make adjustments here, one embodiment of the invention consists in that an adjustment device is assigned to this pivot bearing. With this adjustment device, in particular the axial distance of the tailgate from the drum mouth can be adjusted.
Anhand der Zeichnung, in der Ausführungsbeispiele der Erfindung dargestellt sind, wird diese näher beschrieben.The drawing, in which exemplary embodiments of the invention are shown, will be described in more detail.
Es zeigt:
- FIG. 1
- eine teilweise geschnittene Seitenansicht einer Mischtrommel eines Fahrzeugmischers,
- FIG. 2
- eine Stirnansicht auf den Trommelmund in Richtung A-A der FIGUR 1,
- FIG. 3
- eine teilweise geschnittene Seitenansicht einer Mischtrommel mit einer alternativen Lagerung der Heckklappe,
- FIG. 4
- eine Querschnittansicht längs der Linie B-B gemäß FIGUR 3,
- FIG. 5
- eine vergrößerte Schnittdarstellung einer Lagerstelle des in den FIGUREN 1-4 dargestellten Lagerjoches an einem Trommellaufkranz und
- FIG. 6
- eine Schnittansicht einer abgewandelten Lagerstelle für das Lagerjoch.
- FIG. 1
- 2 shows a partially sectioned side view of a mixing drum of a vehicle mixer,
- FIG. 2nd
- 3 shows an end view of the drum mouth in the direction AA of FIG. 1,
- FIG. 3rd
- a partially sectioned side view of a mixing drum with an alternative storage of the tailgate,
- FIG. 4th
- 3 shows a cross-sectional view along the line BB according to FIG. 3,
- FIG. 5
- an enlarged sectional view of a bearing of the bearing yoke shown in Figures 1-4 on a drum tread and
- FIG. 6
- a sectional view of a modified bearing for the bearing yoke.
Eine Mischtrommel 10 ist heckseitig an einem Aufbau 12 eines Fahrzeugrahmens (nicht dargestellt) mittels eines Laufkranzes 14 und Stützrollen 16 drehbar abgestützt. Die Mischtrommel 10 hat einen heckseitigen Trommelmund 18, der von einer Heckklappe 20 verschließbar ist. An der Heckklappe 20 ist eine Ringdichtung 22 verstellbar befestigt, die in der Schließstellung der Heckklappe 20 an einem Ringflansch 24 der Trommel 10 in der Ebene des Trommelmundes 18 anliegt. An der Heckklappe 20 ist außenseitig ein Aufgabetrichter 26 befestigt, der die Heckklappe 20 durchsetzt und in das Innere der Trommel 10 hineinragt.A mixing
Zur Bugseite hin befindet sich in geringem Abstand von der Ebene des Trommelmundes 18 am Außenumfang der Trommel 10 ein Hilfslaufkranz 28, an dem ein Traggestell 30 mittels eines Lagerjoches 32 relativ drehbar aufgehängt ist. Das Lagerjoch 32 ist im Querschnitt kreisringförmig ausgebildet und erstreckt sich über einen Trommelumfangswinkel von etwas mehr als 240°. Die beiden unteren Enden des Lagerjoches 32 liegen auf gleichem Höhenniveau in der unteren Trommelhälfte. Das Lagerjoch 32 weist drei Lagerstellen, nämlich zwei untere Lagerstellen 34 nahe den unteren Enden des Lagerjoches 32 und eine mittige obere Lagerstelle 36 auf. Mit diesem drei Lagerstellen 34, 34, 36 ist das Lagerjoch 32 am Hilfslaufkranz 28 relativ drehbar gelagert. Um ein Mitdrehen des Lagerjoches 32 mit der Trommel 10 zu verhindern, ist ein Drehverhinderungsschutz 38 in Form eines Lenkers an einem Ende des Lagerjoches 32 angelenkt, dessen anderes Ende mit einer, die Auslaufschurre des Fahrzeugmischers tragenden Strebe des Fahrzeugrahmenaufbaus 12 gelenkig verbunden ist. Die Ausbildung und Position einer Lenkerstange als Drehverhinderungsschutz ist nur beispielsweise dargestellt. Diese Lenkerstange kann vorteilhafterweise auch schräg gestellt sein. Wichtig ist, daß etwaige Verformungen des Fahrzeugrahmens über die mechanische Verbindung 38 nicht auf das Lagerjoch 32 übertragen werden.Towards the bow there is a small distance from the plane of the
Das Traggestell 30 weist zwei am Lagerjoch 32 befestigte Arme 40 auf, die durch ein Querhaupt 42 miteinander verbunden sind und die über Streben 44 mit dem Lagerjoch 32 versteift sind. Das Traggestell 30 umfaßt weiterhin ein Schwenklager 46 für die Heckklappe 20, wobei sich im Höchstbereich des Lagerjoches 32 von diesem zwei Laschen 48 nach hinten erstrecken, die mit Schiebelaschen 50 schwenkbar verbunden sind, welche ihrerseits mittels Langlochverbindung an Ansätzen der Heckklappe 20 befestigt sind. Aufgrund dieser Langlochverbindung 52 läßt sich der axiale Abstand der Heckklappe 20 vom Schwenklager 46 einjustieren.The
Am Querhaupt 42 des Traggestells 30 befindet sich eine Stelleinrichtung 54 in Form eines Hydraulikzylinders, der am Aufgabetrichter 26 angreift, um diesen zusammen mit der Heckklappe 20 um das Schwenklager 46 in die strichpunktierte Darstellung zu verschwenken.On the
Aus der vorstehenden Beschreibung wird deutlich, daß das Traggestell 30 für die Heckklappe 20 mit Aufgabetrichter 26 über das Lagerjoch 32 mit dem Hilfslaufkranz 28 der Mischtrommel 10 verbunden ist und daß mit Ausnahme eines Drehverhinderungsschutzes 38 keinerlei mechanische Verbindung mit dem Aufbau 12 des Fahrzeugrahmens besteht.From the above description it is clear that the
Die Ausführung gemäß der FIGUREN 3 und 4 unterscheidet sich von der vorbeschriebenen Ausführung hauptsächlich nur dadurch, daß der Hilfslaufkranz 28 entfällt und der Hauptlaufkranz 14 für die heckseitige Trommellagerung das Lagerjoch 32 des Traggestells 30 trägt. Da der Laufkranz 14 einen größeren Abstand vom Trommelmund 18 aufweist als der Hilfslaufkranz 32 gemäß FIGUREN 1 und 2 wirkt auf das Lagerjoch 32 eine größere Momentbelastung, die bei der Ausführung gemäß FIGUREN 3 und 4 durch beidseitig angebrachte Gegengewichte 56 am Lagerjoch 32 wenigstens zum größten Teil ausgeglichen wird. Diese Gegengewichte 56 sind vorzugsweise an sich zur Bugseite hin erstreckenden Verlängerungsarmen des Lagerjoches 32 angebracht, um das Ausgleichsmoment zu erhöhen.The embodiment according to FIGS. 3 and 4 differs from the previously described embodiment mainly only in that the
Die Lagerstellen 34, 36 für beide vorbeschriebenen Ausführungsformen weisen gemäß FIG. 5 jeweils zwei Führungsrollen 58 mit zur Mischtrommel 10 radialen Achsen auf. Diese beiden Rollen 58 laufen an den Seitenflächen des Laufkranzes 14 bzw. Hilfslaufkranzes 28 und sind für die axiale Position des Lagerjoches 32 verantwortlich. Eine weitere Laufrolle 60 mit einer zur Trommelachse parallelen Achse läuft an der äußeren Umfangsfläche des Laufkranzes 14 bzw. 28 und bewirkt die radiale Lagerung des Lagerjoches 32.The bearing points 34, 36 for both of the above-described embodiments have, according to FIG. 5 each have two
FIGUR 6 veranschaulicht eine Alternativausbildung der Lagerstellen 34, 36 des Lagerjoches 32, die eine Doppelflanschrolle 62 anstelle der drei Rollen 58, 58, 60 gemäß FIG. 5 verwendet. Der Laufkranz 28 ist dann im Querschnitt dachförmig mit zwei winklig zueinander angeordneten Flanken ausgestattet.FIGURE 6 illustrates an alternative embodiment of the bearing points 34, 36 of the bearing
Claims (5)
- Vehicle-mounted mixer for flowable media such as concrete having a mixing drum (10) which has on its outer periphery a running ring (14) which is rotatably supported by rollers (16) of a structure (12) of the vehicle frame and to which is allocated a rear flap (20) with a charging hopper (26) fixed thereto, wherein the rear flap (20) is mounted pivotably about a stationary pivoting bearing (46) above the drum (10) and is pivotable, by means of a setting device (54), between a closed position sealing the drum mouth (18) by means of a rind seal (22) and an open position and wherein the pivoting bearing (46) and the setting device (54) are arranged on a supporting mount (30), characterised in that the supporting mount (30) is mounted on the drum (10) rotatably relative to the axis of the drum (10) and has a protective device to prevent simultaneous rotation, that a bearing yoke (32) is provided which is mounted, extending axially and radially, by means of at least two peripherally spaced bearings (34, 36) having rollers (58-62), on the running ring (14) of the drum (10) or an auxiliary running ring (28) arranged between the running ring (14) and the drum mouth (18), and engages around the running ring (14) or auxiliary running ring (28) along at least half of its circumference and that, in its topmost region, the bearing yoke (32) supports the pivoting bearing (46) of the rear flap (20) and that two arms (40) which are connected to one another by means of a cross-head (42) are fixed to the bearing yoke (32), the setting device (54) for pivoting the rear flap (20) being supported on the two arms (40).
- Vehicle-mounted mixer according to claim 1, characterised in that the bearing yoke (32) is designed as an annular ring open at the bottom, the two ends of which are arranged at least approximately at the same level in the lower half of the drum and that the bearing yoke (32) has, at or near each end, a lower bearing (34) on the running ring (14) or auxiliary running ring (28) and at least one further upper bearing (36) in the topmost region of the running or auxiliary running ring (14; 28).
- Vehicle-mounted mixer according to claim 1 or 2, characterised in that compensating weights are attached to the bearing yoke (32) facing towards the closed side.
- Vehicle-mounted mixer according to claims 1 to 3, characterised in that the protective device to prevent simultaneous rotation (38) has a steering arrangement which connects the bearing yoke (32) to the structure (12) of the vehicle frame in an articulated manner.
- Vehicle-mounted mixer according to one of claims 1 - 4, characterised in that the pivoting bearing (46) of the rear flap (20) has an adjusting device (52) on the mouth of the drum (18) for adjusting the rear flap (20).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT93107243T ATE140420T1 (en) | 1993-05-05 | 1993-05-05 | VEHICLE MIXER FOR FLOWING MEDIA, SUCH AS CONCRETE |
EP93107243A EP0642900B1 (en) | 1993-05-05 | 1993-05-05 | Vehicle mounted mixer for flowable medium such as concrete |
DE59303269T DE59303269D1 (en) | 1993-05-05 | 1993-05-05 | Vehicle mixers for flowable media, such as concrete |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93107243A EP0642900B1 (en) | 1993-05-05 | 1993-05-05 | Vehicle mounted mixer for flowable medium such as concrete |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0642900A1 EP0642900A1 (en) | 1995-03-15 |
EP0642900B1 true EP0642900B1 (en) | 1996-07-17 |
Family
ID=8212874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93107243A Expired - Lifetime EP0642900B1 (en) | 1993-05-05 | 1993-05-05 | Vehicle mounted mixer for flowable medium such as concrete |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0642900B1 (en) |
AT (1) | ATE140420T1 (en) |
DE (1) | DE59303269D1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4431501B4 (en) * | 1994-09-03 | 2004-09-16 | Stetter Gmbh | Vehicle mixers for flowable media, such as concrete |
DE9416517U1 (en) * | 1994-10-13 | 1995-01-12 | Liebherr-Mischtechnik Gmbh, 88427 Bad Schussenried | Truck mixer |
CN105313225B (en) * | 2015-08-03 | 2017-10-03 | 湖北江山专用汽车有限公司 | Adjustable oblique pull support meanss and apply its trucd mixer |
CN109986698B (en) * | 2019-05-08 | 2024-04-19 | 盛镝 | Self-sealing spiral rotary sealing device for rotary barrel |
CN110202695B (en) * | 2019-07-01 | 2023-12-29 | 盛镝 | Portable rotary sealing mechanism |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2350285A (en) * | 1942-08-17 | 1944-05-30 | T L Smith Co | Concrete mixer |
US2572058A (en) * | 1948-09-18 | 1951-10-23 | Blaw Knox Co | Charging and discharging mechanism for mixers |
DE58900325D1 (en) * | 1988-12-17 | 1991-10-31 | Stetter Gmbh | VEHICLE CONCRETE MIXER. |
-
1993
- 1993-05-05 DE DE59303269T patent/DE59303269D1/en not_active Expired - Fee Related
- 1993-05-05 EP EP93107243A patent/EP0642900B1/en not_active Expired - Lifetime
- 1993-05-05 AT AT93107243T patent/ATE140420T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0642900A1 (en) | 1995-03-15 |
ATE140420T1 (en) | 1996-08-15 |
DE59303269D1 (en) | 1996-08-22 |
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