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EP0022851B1 - Twin-cylinder pump, in particular for pumping thick liquids - Google Patents

Twin-cylinder pump, in particular for pumping thick liquids Download PDF

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Publication number
EP0022851B1
EP0022851B1 EP80900342A EP80900342A EP0022851B1 EP 0022851 B1 EP0022851 B1 EP 0022851B1 EP 80900342 A EP80900342 A EP 80900342A EP 80900342 A EP80900342 A EP 80900342A EP 0022851 B1 EP0022851 B1 EP 0022851B1
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EP
European Patent Office
Prior art keywords
conveying
tube
pump according
rear wall
swivel
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
Application number
EP80900342A
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German (de)
French (fr)
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EP0022851A1 (en
Inventor
Karl Schlecht
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Individual
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Individual
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Publication of EP0022851B1 publication Critical patent/EP0022851B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0084—Component parts or details specially adapted therefor
    • F04B7/0088—Sealing arrangements between the distribution members and the housing
    • F04B7/0096—Sealing arrangements between the distribution members and the housing for pipe-type distribution members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/90—Slurry pumps, e.g. concrete

Definitions

  • the invention relates to a pump with two cylinders arranged parallel to one another, opening into a filling container, in particular for conveying thick materials, such as, for. B.
  • a filling container in particular for conveying thick materials, such as, for. B.
  • Concrete with an S-shaped curve, arranged within the filling container, pivotally mounted at its end on the delivery line side in the wall of the filling container, with its end on the delivery cylinder side alternately in front of the delivery cylinder, which can be pivoted against the tube via a wear ring sealed against the tube wall of the filling cylinder on the delivery cylinder side and abuts against the end face of the delivery line via a sealing ring.
  • the conveyed material is sucked from the filling container into this cylinder during the backward stroke of the piston of the one conveying cylinder, while during the simultaneous forward stroke of the piston of the other conveying cylinder, the conveyed material previously sucked into this conveying cylinder through the swivel pipe into the conveying line connected to the swivel pipe is pressed.
  • a reliable seal is to be achieved according to a further proposal (DEA2632816) in that the wear ring is movably and advantageously pivotably mounted on an additional tensioning device relative to the end of the swivel tube, in order in this way to counteract uneven wear of the wear ring, which is caused by the fact that the Regions of the wear ring which are closer to the pivot axis of the pivot tube are subject to less wear than the more distant regions which sweep over a larger area of the container rear wall or its pressure plate during a pivoting movement.
  • the invention is therefore based on the object of ensuring reliable sealing of the swivel tube both at its end on the delivery cylinder side and at its end on the bearing side using structurally simpler means, to achieve uniform wear of the wearing parts and to facilitate their interchangeability, and advantageously to design the swivel tube so that it can optionally be installed pivoted by 180 ° about a transverse axis.
  • the outer diameter of the end face of the axially displaceable swivel tube which is acted upon by the pressure of the conveyed material is greater than the effective effective diameter of the annular contact surface with which the wear ring is directly or indirectly against the wall on the delivery cylinder side - in the following » Rear wall «- of the filling container.
  • the end face of the swivel tube on the delivery line side is advantageously acted hydrostatically via an elastic element, which advantageously simultaneously performs a sealing function.
  • the swivel bearing on the delivery line side advantageously has an axial abutment, which is formed by the pressure flange of a connecting tube, which is used to adjust a certain preload of the elastic element or for its adjustment is advantageously connected by means of tie rods to the filling container, preferably to the rear wall thereof.
  • the conveying material pressure acting on the parts of the pivot bearing is converted into an axial thrust force acting on the end face of the pivot tube and thus an increased pressure of the wear ring against the rear wall of the filling container or against one against the Pressed back wall of the filling container, made of wear-resistant material, causes two recesses corresponding to the inner diameter of the delivery cylinder.
  • the swivel device consists of the shift lever 12, the shift shaft 11 mounted in the rear wall 44 of the filling container 1 and the swivel lever 10 partially encompassing the end of the swivel tube 5.
  • the shift lever 12 is actuated by means of two hydraulic cylinders 40, which are formed by extensions 43 of the rear wall 44 Joint sockets 42 are mounted and their piston rods engage in ball joints of the shift lever 12.
  • the hydraulic cylinders 40 as can be seen from Fig., Form an acute angle with the rear wall 44, an axial force is exerted on the selector shaft 11, which the axial pressure of the pivot tube 5 or the wear ring 20 arranged on it against the pressure plate 22 - hereinafter referred to as "glasses plate" - supports.
  • the bearing 18 is designed in such a way that the cardan shaft 11 can move gently.
  • the selector lever 12 and the pivot lever 10 are fastened by means of clamping screws 13 and 15, respectively.
  • the hydraulic pressure driving the pistons 3 of the delivery cylinders 2 advantageously acts, so that with increasing pressure the force component of the hydraulic cylinders 40 acting in the axial direction of the selector shaft 11 exerts an increasing, sealing contact pressure on the swivel tube 5.
  • the bearing 18 is sealed by means of sealing rings 17.
  • the eyeglass plate 22 To hold the eyeglass plate 22 in a pressure-resistant manner, it has an inclined surface 7 in its region adjacent to the housing of the bearing 18 and in the edge region adjacent to the bottom of the filling container 1, which is provided by inclined counter surfaces such as those on the circumference 8 of the bearing housing and on terminal strips 9 are intended to be encroached upon.
  • This type of attachment of the eyeglass plate 22 makes it possible to manufacture it from wear-resistant, hard material which makes drilling difficult, and it is easy to replace.
  • the wear ring 20 is sealed off from the swivel tube 5 by means of a sealing ring 21 bearing against an annular shoulder. This leaves the wear ring a certain freedom of movement, so that it fits tightly in the event of misalignment or elastic deformations over the entire circumference of the circular recesses provided in the eyeglass plate 22 and matching the cylinder openings 25.
  • the wear ring 20 is under pressure against the pivot lever 10, which in turn rests against an annular shoulder 38 of the pivot tube, thereby preventing the sealing ring 21 from being crushed if the axial pressing force is too great.
  • a spherical contact surface is provided between the pivot lever 10 or the pivot tube 5 and the wear ring 20.
  • a bearing bush 32 is inserted into a cylindrical recess, the outer diameter 28 (B) of which is larger than the effective effective diameter 26 (A) of the end face of the wear ring 20 resting against the spectacle plate 22.
  • This bearing bush 32 is in the Bearing shell 31 mounted, the conical end face of which is overlapped by the collar of a pot-shaped part 30, which is fastened to the wall of the filling container 1 with screws.
  • the elastic element 33 acting as a sealing ring is arranged, which is enclosed by a pressure sleeve 34.
  • Tie rods 36 the other end of which is screwed into the rear wall 44, engage on lateral approaches of the connecting tube 4.
  • Self-locking nuts 37 are screwed onto these tie rods, which limit the preload of the bearing shell 31 and the sealing ring 33 and facilitate installation and removal while avoiding incorrect settings.
  • This design of the pivot bearing in connection with the tensioning screws 15 enables the pivot tube 5 to be easily removed in the event of wear. After removing the connecting tube 4 and dismantling the pot 30, the pivot tube 5 can also be removed upwards. An expansion of the swivel tube 5 is also possible after removing the connecting tube 4 with the bearing shell 31 still installed in the axial direction towards the pressure side.
  • the pressure exerted on the bearing shell 31 by the pressure sleeve 34 brings about radial pressure and readjustment of the bearing shell 31, as a result of which bearing wear is compensated for and the penetration of conveyed goods into the bearing is prevented.
  • the annular recesses at the two ends of the swivel tube 5 have the same dimensions, so that with the same outer diameters 27 and 29, the swivel tube 5 can be installed pivoted about 180 ° around the transverse axis with one-sided wear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

PCT No. PCT/DE80/00011 Sec. 371 Date Oct. 1, 1980 Sec. 102(e) Date Sep. 25, 1980 PCT Filed Jan. 31, 1980 PCT Pub. No. WO80/01594 PCT Pub. Date Aug. 7, 1980.In pumps for viscous substances, particularly pumps for concrete, with two feed cylinders (2) opening out into a hopper (1), which cylinders (2) alternately draw the material to be forwarded from the hopper (1) and press it via a swingable S-shaped tube (5), arranged within the hopper (1), into a delivery pipe, the swivel bearing is constructed in such a way that the pressure of the material to be forwarded is changed into an axial thrust force on the axially movably arranged swivel tube (5) whereby the contact pressure of a wear ring (20) is increased, to ensure a sealing abutment of the wear ring attached to the end of the swivel tube with the rear wall (44) of the hopper (1) including the outlets of the feed cylinders, which wall (44) may if necessary, be reinforced with a spacer (22), and to ensure uniform wear over the whole face of the wear ring (20). Uniform wear of the wear ring (20) over the whole of its face is additionally effected in that the wear ring (20) is rotatably mounted on the end of the swivel tube (5).

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Pumpe mit zwei parallel zueinander angeordneten, in einen Füllbehälter mündenden Zylindern, insbesondere zur Förderung von Dickstoffen, wie z. B. Beton, mit einem S-förmig gekrümmten, innerhalb des Füllbehälters angeordneten, an seinem förderleitungsseitigen Ende in der Wand des Füllbehälters schwenkbar gelagerten, mit seinem förderzylinderseitigen Ende im Wechsel vor die Förderzylinder schwenkbaren Rohr, das über einen gegenüber dem Rohr abgedichteten Verschleißring gegen die förderzylinderseitige Wand des Füllbehälters und über einen Dichtring gegen die Stirnfläche der Förderleitung anliegt.The invention relates to a pump with two cylinders arranged parallel to one another, opening into a filling container, in particular for conveying thick materials, such as, for. B. Concrete, with an S-shaped curve, arranged within the filling container, pivotally mounted at its end on the delivery line side in the wall of the filling container, with its end on the delivery cylinder side alternately in front of the delivery cylinder, which can be pivoted against the tube via a wear ring sealed against the tube wall of the filling cylinder on the delivery cylinder side and abuts against the end face of the delivery line via a sealing ring.

Bei Pumpen dieser Art wird das Fördergut während des Rückwärtshubs des Kolbens des einen Förderzylinders aus dem Füllbehälter in diesen Zylinder eingesaugt, während bei dem gleichzeitigen Vorwärtshub des Kolbens des anderen Förderzylinders das zuvor in diesen Förderzylinder eingesaugte Fördergut durch das Schwenkrohr in die an das Schwenkrohr angeschlossene förderleitung gepreßt wird.In pumps of this type, the conveyed material is sucked from the filling container into this cylinder during the backward stroke of the piston of the one conveying cylinder, while during the simultaneous forward stroke of the piston of the other conveying cylinder, the conveyed material previously sucked into this conveying cylinder through the swivel pipe into the conveying line connected to the swivel pipe is pressed.

Bei der Konstruktion dieser Pumpen muß darauf geachtet werden, daß der Verschleißring bei dem jeweiligen Druckhub eines Förderzylinders vollkommen dicht gegen die Rückwand des Füllbehälters bzw. gegen eine die Rückwand abdeckende, aus verschleißfestem Werkstoff bestehende Druckplatte anliegt, um zu verhindern, daß Flüssigkeit oder auch feinkörnige Bestandteile des Fördergutes an dieser Stelle aus dem Fördergut austreten, was zu einem erhöhten Verschleiß der sich gegeneinander bewegenden Teile und im Falle von Beton dazu führt, daß dieser verarmt. Es wurde nämlich festgestellt, daß unter der Wirkung des sehr hohen Druckes, mit welchem beispielsweise Beton durch das Schwenkrohr gepreßt wird, dieser sich von der Rückwand des Füllbehälters bzw. von einer mit dieser Rückwand verbundenen Druckplatte abhebt und auch elastischen Verformungen unterworfen ist.When designing these pumps, care must be taken to ensure that the wear ring lies perfectly tight against the rear wall of the filling container or against a pressure plate covering the rear wall and made of wear-resistant material during the respective pressure stroke of a delivery cylinder, in order to prevent liquid or fine-grained material Components of the material to be conveyed emerge from the material to be conveyed at this point, which leads to increased wear of the parts moving against one another and, in the case of concrete, to the fact that it becomes impoverished. It has been found that under the effect of the very high pressure with which, for example, concrete is pressed through the swivel tube, it lifts off from the rear wall of the filling container or from a pressure plate connected to this rear wall and is also subjected to elastic deformations.

Stand der TechnikState of the art

Zur Vermeidung dieser Nachteile ist schon vorgeschlagen worden (DE-A-2 444 464) den Schwenkrohrantrieb durch entsprechende Dimensionierung der Schaltwelle und des am Schwenkrohrende angreifenden Schwenkhebels zu versteifen oder den Schwenkrohrantrieb so auszubilden, daß dessen Organe nicht nur am förderzylinderseitigen Ende, sondern auch am lagerseitigen Ende des Schwenkrohrs angreifen, wodurch gleichzeitig einer elastischen Verformung des Schwenkrohrs entgegengewirkt wird. Um die Ausbildung eines trotz dieser Maßnahmen nicht zu verhindernden Spaltes am zylinderseitigen Ende des Schwenkrohrs zu vermeiden, wird darüber hinaus vorgeschlagen, die vor der Rückwand des Füllbehälters angeordnete Druckplatte gegenüber der Rückwand verstellbar auszubilden.To avoid these disadvantages, it has already been proposed (DE-A-2 444 464) to stiffen the swivel tube drive by appropriately dimensioning the selector shaft and the swivel lever acting on the swivel tube end, or to design the swivel tube drive so that its organs not only at the end on the delivery cylinder side, but also on attack the end of the swivel tube on the bearing side, which simultaneously counteracts elastic deformation of the swivel tube. In order to avoid the formation of a gap at the cylinder end of the swivel tube, which gap cannot be prevented despite these measures, it is also proposed to design the pressure plate arranged in front of the rear wall of the filling container so as to be adjustable relative to the rear wall.

Eine zuverlässige Abdichtung soll nach einem weiteren Vorschlag (DEA2632816 dadurch erzielt werden, daß der Verschleißring an einer zusätzlichen Spannvorrichtung gegenüber dem Schwenkrohrende beweglich und vorteilhafterweise schwenkbar gelagert ist, um auf diese Weise einem ungleichmäßigen Verschleiß des Verschleißrings entgegenzuwirken, der dadurch hervorgerufen wird, daß die der Schwenkachse des Schwenkrohrs näher gelegenen Bereiche des Verschfeißrings einem geringeren Verschleiß unterworfen sind als die entfernteren Bereiche, die bei einer Schwenkbewegung eine größere Fläche der Behälterrückwand bzw. deren Druckplatte überstreichen.A reliable seal is to be achieved according to a further proposal (DEA2632816) in that the wear ring is movably and advantageously pivotably mounted on an additional tensioning device relative to the end of the swivel tube, in order in this way to counteract uneven wear of the wear ring, which is caused by the fact that the Regions of the wear ring which are closer to the pivot axis of the pivot tube are subject to less wear than the more distant regions which sweep over a larger area of the container rear wall or its pressure plate during a pivoting movement.

Diese Vorrichtungen machen jedoch verhältnismäßig aufwendige Konstruktionen erforderlich, die den Nachteil aufweisen, daß ein Auswechseln der dem Verschleiß unterworfenen Teile mit Schwierigkeiten verbunden ist und daß der angestrebte Zweck insbesondere bei sehr hohen, im Schwenkrohr auftretenden Drücken nicht zufriedenstellend erzielt wird.However, these devices require relatively complex designs, which have the disadvantage that replacement of the parts subject to wear is difficult and that the intended purpose is not achieved satisfactorily, in particular at very high pressures occurring in the swivel tube.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, eine zuverlässige Abdichtung des Schwenkrohrs sowohl an dessen förderzylinderseitigem Ende als auch an dessen lagerseitigem Ende mit konstruktiv einfacheren Mitteln zu gewährleisten, einen gleichmäßigen Verschleiß der Verschleißteile zu erzielen und deren Austauschbarkeit zu erleichtern sowie das Schwenkrohr vorteilhafterweise so auszubilden, daß es wahlweise um 180° um eine Querachse geschwenkt eingebaut werden kann.The invention is therefore based on the object of ensuring reliable sealing of the swivel tube both at its end on the delivery cylinder side and at its end on the bearing side using structurally simpler means, to achieve uniform wear of the wearing parts and to facilitate their interchangeability, and advantageously to design the swivel tube so that it can optionally be installed pivoted by 180 ° about a transverse axis.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Außendurchmesser der vom Druck des Fördergutes beaufschlagten förderleitungsseitigen Stirnfläche des axial verschiebbaren Schwenkrohrs größer ist als der Dicht-Wirkdurchmesser der ringförmigen Berührungsfläche, mit der der Verschleißring mittelbar oder unmittelbar gegen die förderzylinderseitige Wand - im folgenden »Rückwand« genannt - des Füllbehälters anliegt. Die Beaufschlagung der förderleitungsseitigen Stirnfläche des Schwenkrohres erfolgt vorteilhafterweise hydrostatisch über ein elastisches Element, das vorteilhafterweise gleichzeitig eine Dichtfunktion ausübt.This object is achieved according to the invention in that the outer diameter of the end face of the axially displaceable swivel tube which is acted upon by the pressure of the conveyed material is greater than the effective effective diameter of the annular contact surface with which the wear ring is directly or indirectly against the wall on the delivery cylinder side - in the following » Rear wall «- of the filling container. The end face of the swivel tube on the delivery line side is advantageously acted hydrostatically via an elastic element, which advantageously simultaneously performs a sealing function.

Das förderleitungsseitige Schwenklager weist vorteilhafterweise ein axiales Widerlager auf, das durch den Druckflansch eines Verbindungsrohres gebildet wird, das zur Einstellung einer bestimmten Vorspannung des elastischen Elements bzw. auch zu dessen Nachstellung vorteilhafterweise mittels Zuganker mit dem Füllbehälter, vorzugsweise mit dessen Rückwand verbunden ist.The swivel bearing on the delivery line side advantageously has an axial abutment, which is formed by the pressure flange of a connecting tube, which is used to adjust a certain preload of the elastic element or for its adjustment is advantageously connected by means of tie rods to the filling container, preferably to the rear wall thereof.

Durch die erfindungsgemäße Ausbildung des Schwenklagers und die Bemessung des Dicht-Wirkdurchmessers wird der auf die Teile des Schwenklagers wirkende Fördergutdruck in eine auf die Stirnfläche des Schwenkrohrs wirkende Axialschubkraft umgesetzt und damit eine erhöhte Anpressung des Verschleißrings gegen die Rückwand des Füllbehälters bzw. gegen eine gegen die Rückwand des Füllbehälters angepreßte, aus verschleißfestem Werkstoff bestehende Druckplatte bewirkt, die zwei dem Innendurchmesser der Förderzylinder entsprechende Aussparungen aufweist.Due to the inventive design of the pivot bearing and the dimensioning of the effective sealing diameter, the conveying material pressure acting on the parts of the pivot bearing is converted into an axial thrust force acting on the end face of the pivot tube and thus an increased pressure of the wear ring against the rear wall of the filling container or against one against the Pressed back wall of the filling container, made of wear-resistant material, causes two recesses corresponding to the inner diameter of the delivery cylinder.

Weitere Vorteile der erfindungsgemäßen Konstruktion ergeben sich aus den Unteransprüchen und der Zeichnung, die in schematischer Weise ein Ausführungsbeispiel des Erfindungsgegenstandes darstellt und im folgenden beschrieben ist:Further advantages of the construction according to the invention result from the subclaims and the drawing, which schematically represents an embodiment of the subject matter of the invention and is described below:

Beschreibung der ZeichnungDescription of the drawing in der Zeichnung zeigtshows in the drawing

  • Fig. 1 einen Längsschnitt durch das vordere Ende des einen der beiden Förderzylinder, die Schwenkvorrichtung, das Schwenkrohr und dessen Lager,1 shows a longitudinal section through the front end of one of the two delivery cylinders, the pivoting device, the pivoting tube and its bearing,
  • Fig. 2 eine Draufsicht auf den in Fig. 1 dargestellten Teil der Pumpe, teilweise im Schnitt,2 is a plan view of the part of the pump shown in FIG. 1, partly in section,
  • Fig. 3 einen senkrechten, in zueinander parallelen Ebenen durch den Füllbehälter, das Schwenkrohr und die Schwenkvorrichtung gelegten Schnitt.Fig. 3 is a vertical section in parallel planes through the filling container, the swivel tube and the swivel device.

Die Schwenkvorrichtung besteht aus dem Schalthebel 12, der in der Rückwand 44 des Füllbehälters 1 gelagerten Schaltwelle 11 und dem das Ende des Schwenkrohrs 5 teilweise umfassenden Schwenkhebel 10. Der Schalthebel 12 wird mittels zweier Hydraulikzylinder 40 betätigt, die in durch Ansätze 43 der Rückwand 44 gebildeten Gelenkpfannen 42 gelagert sind und deren Kolbenstangen in Kugelgelenken des Schalthebels 12 angreifen. Dadurch, daß die Hydraulikzylinder 40, wie aus Fig. ersichtlich ist, mit der Rückwand 44 einen spitzen Winkel bilden, wird auf die Schaltwelle 11 eine Axialkraft ausgeübt, die die axiale Anpressung des Schwenkrohres 5 bzw. des auf ihr angeordneten Verschleißringes 20 gegen die Druckplatte 22 - im folgenden »Brillenplatte« genannt - unterstützt. Um etwaige Verspannungen des Lagers der Schaltwelle 11 zu vermeiden, die durch elastische Verformungen des Füllbehälters und seiner Rückwand hervorgerufen werden können, ist das Lager 18 so ausgebildet, daß eine leicht kardanische Beweglichkeit der Schaltwelle 11 möglich ist. Auf den ein Sechskantprofil aufweisenden Enden der Schaltwelle 11 ist der Schalthebel 12 und der Schwenkhebel 10 mittels Spannschrauben 13 bzw. 15 befestigt. In den Hydraulikzylindern 40 wirkt vorteilhafterweise der die Kolben 3 der Förderzylinder 2 antreibende Hydraulikdruck, so daß bei zunehmendem Druck die in Achsrichtung der Schaltwelle 11 wirkende Kraftkomponente der Hydraulikzylinder 40 eine zunehmende, dichtende Anpreßkraft auf das Schwenkrohr 5 ausübt. Das Lager 18 ist mittels Dichtringen 17 abgedichtet. Zur druckfesten Halterung der Brillenplatte 22 weist diese in ihrem an das Gehäuse des Lagers 18 angrenzenden Bereich sowie in dem an dem Boden des Füllbehälters 1 angrenzenden Randbereich eine Schrägfläche 7 auf, die von schrägen Gegenflächen, wie sie am Umfang 8 des Lagergehäuses und an Klemmleisten 9 vorgesehen sind, übergriffen werden. Die mit Schrauben gegen die Rückwand 44 angezogenen Klemmleisten 9 drücken die Brillenplatte 22 gegen die Gegenschrägtläche am Umfang 8 des Lagergehäuses und damit gegen die Rückwand 44, in die eine Dichtung 23 eingelegt ist. Diese Art der Befestigung der Brillenplatte 22 ermöglicht deren Herstellung aus verschleißfestem hartem und das Anbringen von Bohrungen erschwerendem Werkstoff sowie eine leichte Austauschbarkeit.The swivel device consists of the shift lever 12, the shift shaft 11 mounted in the rear wall 44 of the filling container 1 and the swivel lever 10 partially encompassing the end of the swivel tube 5. The shift lever 12 is actuated by means of two hydraulic cylinders 40, which are formed by extensions 43 of the rear wall 44 Joint sockets 42 are mounted and their piston rods engage in ball joints of the shift lever 12. Characterized in that the hydraulic cylinders 40, as can be seen from Fig., Form an acute angle with the rear wall 44, an axial force is exerted on the selector shaft 11, which the axial pressure of the pivot tube 5 or the wear ring 20 arranged on it against the pressure plate 22 - hereinafter referred to as "glasses plate" - supports. In order to avoid any tensioning of the bearing of the selector shaft 11, which can be caused by elastic deformations of the filling container and its rear wall, the bearing 18 is designed in such a way that the cardan shaft 11 can move gently. On the ends of the selector shaft 11 which have a hexagonal profile, the selector lever 12 and the pivot lever 10 are fastened by means of clamping screws 13 and 15, respectively. In the hydraulic cylinders 40, the hydraulic pressure driving the pistons 3 of the delivery cylinders 2 advantageously acts, so that with increasing pressure the force component of the hydraulic cylinders 40 acting in the axial direction of the selector shaft 11 exerts an increasing, sealing contact pressure on the swivel tube 5. The bearing 18 is sealed by means of sealing rings 17. To hold the eyeglass plate 22 in a pressure-resistant manner, it has an inclined surface 7 in its region adjacent to the housing of the bearing 18 and in the edge region adjacent to the bottom of the filling container 1, which is provided by inclined counter surfaces such as those on the circumference 8 of the bearing housing and on terminal strips 9 are intended to be encroached upon. The clamping strips 9, which are tightened with screws against the rear wall 44, press the spectacle plate 22 against the counter-inclined surface on the circumference 8 of the bearing housing and thus against the rear wall 44, into which a seal 23 is inserted. This type of attachment of the eyeglass plate 22 makes it possible to manufacture it from wear-resistant, hard material which makes drilling difficult, and it is easy to replace.

Der Verschleißring 20 ist gegenüber dem Schwenkrohr 5 mittels eines gegen eine Ringschulter anliegenden Dichtringes 21 abgedichtet. Dieser läßt dem Verschleißring einen gewissen Bewegungsspielraum, so daß er auch bei Fluchtungsfehlern oder elastischen Verformungen am gesamten Umfang der in der Brillenplatte 22 vorgesehenen, mit den Zylinderöffnungen 25 übereinstimmenden kreisförmigen Aussparungen dichtend anliegt. Der Verschleißring 20 liegt unter Druck gegen den Schwenkhebel 10 an, der seinerseits gegen eine Ringschulter 38 des Schwenkrohres anliegt, wodurch verhindert wird, daß bei allzu großer axialer Anpreßkraft der Dichtring 21 zerquetscht wird. Um auch bei einem ungleichmäßigen Verschleiß der Oberfläche der Brillenplatte 22 ein gleichmäßiges Anliegen des Verschleißringes 20 zu gewährleisten, ist zwischen dem Schwenkhebel 10 bzw. dem Schwenkrohr 5 und dem Verschleißring 20 eine ballige Berührungsfläche vorgesehen.The wear ring 20 is sealed off from the swivel tube 5 by means of a sealing ring 21 bearing against an annular shoulder. This leaves the wear ring a certain freedom of movement, so that it fits tightly in the event of misalignment or elastic deformations over the entire circumference of the circular recesses provided in the eyeglass plate 22 and matching the cylinder openings 25. The wear ring 20 is under pressure against the pivot lever 10, which in turn rests against an annular shoulder 38 of the pivot tube, thereby preventing the sealing ring 21 from being crushed if the axial pressing force is too great. In order to ensure even wear of the wear ring 20 even when the surface of the eyeglass plate 22 is worn unevenly, a spherical contact surface is provided between the pivot lever 10 or the pivot tube 5 and the wear ring 20.

Am lagerseitigen Ende des Schwenkrohres 5 ist in eine zylindrische Aussparung eine Lagerbuchse 32 eingesetzt, deren Außendurchmesser 28 (B) größer ist als der Dicht-Wirkdurchmesser 26 (A) der gegen die Brillenplatte 22 anliegenden Stirnfläche des Verschleißringes 20. Diese Lagerbuchse 32 ist in der Lagerschale 31 gelagert, deren konusförmige Stirnfläche von dem Kragen eines topfförmigen Teils 30 übergriffen wird, der mit Schrauben an der Wand des Füllbehälters 1 befestigt ist. Zwischen der Stirnfläche des Schwenkrohres 5 und der Lagerbuchse 32 einerseits und dem Flansch des Verbindungsrohres 4 ist das als Dichtring wirkende elastische Element 33 angeordnet, das von einer Druckhülse 34 umschlossen ist. An seitlichen Ansätzen des Verbindungsrohres 4 greifen Zuganker 36 an, deren anderes Ende in die Rückwand 44 eingeschraubt ist. Auf diese Zuganker sind selbstsichernde Muttern 37 aufgeschraubt, die die Vorspannung der Lagerschale 31 und des Dichtringes 33 begrenzen sowie den Ein- und Ausbau bei Vermeidung von Fehleinstellungen erleichtern. Diese Ausbildung des Schwenklagers ermöglicht im Zusammenhang mit den Spannschrauben 15 einen leichten Ausbau des Schwenkrohres 5 im Verschleißfall. Nach Entfernung des Verbindungsrohres 4 und Demontage des Topfes 30 kann das Schwenkrohr 5 auch nach oben ausgebaut werden. Ein Ausbau des Schwenkrohres 5 ist aber auch nach Entfernung des Verbindungsrohres 4 bei noch eingebauter Lagerschale 31 in Axialrichtung nach der Druckseite hin möglich.At the end of the swivel tube 5 on the bearing side, a bearing bush 32 is inserted into a cylindrical recess, the outer diameter 28 (B) of which is larger than the effective effective diameter 26 (A) of the end face of the wear ring 20 resting against the spectacle plate 22. This bearing bush 32 is in the Bearing shell 31 mounted, the conical end face of which is overlapped by the collar of a pot-shaped part 30, which is fastened to the wall of the filling container 1 with screws. Between the end face of the swivel tube 5 and the bearing bush 32 on the one hand and the flange of the connecting tube 4, the elastic element 33 acting as a sealing ring is arranged, which is enclosed by a pressure sleeve 34. Tie rods 36, the other end of which is screwed into the rear wall 44, engage on lateral approaches of the connecting tube 4. Self-locking nuts 37 are screwed onto these tie rods, which limit the preload of the bearing shell 31 and the sealing ring 33 and facilitate installation and removal while avoiding incorrect settings. This design of the pivot bearing in connection with the tensioning screws 15 enables the pivot tube 5 to be easily removed in the event of wear. After removing the connecting tube 4 and dismantling the pot 30, the pivot tube 5 can also be removed upwards. An expansion of the swivel tube 5 is also possible after removing the connecting tube 4 with the bearing shell 31 still installed in the axial direction towards the pressure side.

Der auf die Lagerschale 31 von der Druckhülse 34 ausgeübte Druck bewirkt eine radiale Anpressung und Nachstellung der Lagerschale 31, wodurch ein Lagerverschleiß ausgeglichen bzw. das Eindringen von Fördergut in das Lager verhindert wird.The pressure exerted on the bearing shell 31 by the pressure sleeve 34 brings about radial pressure and readjustment of the bearing shell 31, as a result of which bearing wear is compensated for and the penetration of conveyed goods into the bearing is prevented.

Die ringförmigen Aussparungen an den beiden Enden des Schwenkrohres 5 weisen dieselben Abmessungen auf, so daß bei gleich großen Außendurchmessern 27 und 29 das Schwenkrohr 5 bei einseitigem Verschleiß um 180° um die Querachse geschwenkt eingebaut werden kann.The annular recesses at the two ends of the swivel tube 5 have the same dimensions, so that with the same outer diameters 27 and 29, the swivel tube 5 can be installed pivoted about 180 ° around the transverse axis with one-sided wear.

Ein gleichmäßiger Verschleiß des Verschleißringes 20 an seinen Stirnflächen wird dadurch gewährleistet, daß dieser sich auf dem Schwenkrohrende um seine Achse drehen kann, wodurch die Lebensdauer dieses Verschleißringes erhöht wird. Infolge der selbsttätigen Nachstellung der Verschleißteile und des auf das Schwenkrohr 5 ausgeübten Axialschubs sowie durch den gleichmäßigen Verschleiß der Verschleißteile an der ganzen dem Verschleiß ausgesetzten Oberfläche wird eine gegenüber bekannten Pumpen erhöhte Betriebssicherheit erzielt.Uniform wear of the wear ring 20 on its end faces is ensured by the fact that it can rotate about its axis on the end of the swivel tube, which increases the service life of this wear ring. As a result of the automatic readjustment of the wearing parts and the axial thrust exerted on the swivel tube 5 and the uniform wear of the wearing parts on the entire surface exposed to wear, increased operational reliability is achieved compared to known pumps.

Claims (13)

1. A pump with two mutually parallel cylinders, opening into a charging container, in particular for conveying thick materials, such as concrete for example, and with an S-shaped tube which is arranged within the charging container, is swivellably mounted at its conveying-pipe-side end in the wall of the charging container and can be swivelled to bring its conveying-cylinder-side end in front of each of the conveying cylinders in turn, which tube bears, by way of wearresisting rings, against the conveying-cylinder-side wall of the charging container and, by way of a sealing ring, against the end-face of the conveying pipe, characterized in that the outside diameter of the conveying-pipe-side end face of the axially displaceable swivel tube (5), that is acted upon by the pressure of the conveyed material, is greater than the effective sealing diameter (26) of the annular contact face whereby the wear-resisting ring (20) bears indirectly or directly against the conveying-cylinder-side wall (44) of the charging container (1), this wall being hereinafter referred to as »the rear wall«.
2. A pump according to claim 1, characterized in that the conveying-pipe-side end face of the swivel tube (5) is acted upon hydrostatically by the conveyed material by way of the sealing ring (33) constituted by a resilient element.
3. A pump according to claims 1 and 2, characterized in that the conveying-pipe-side swivel bearing has an axial backing element (4), which is constituted by a connecting pipe having a pressure flange.
4. A pump according to claim 3, characterized in that the connecting tube (4) is connected to the charging container (1) in an axially adjustable and readily releasable manner by means of tie-rods (36).
5. A pump according to claim 4, characterized in that the connecting tube (4) is connected to the rear wall (44) of the charging container (1) by means of tie-rods (36).
6. A pump according to any one of claims 1 to 5, characterized in that the wear-resisting ring (20) embraces the conveying-cylinder-side end of the swivel tube (5) and bears against a pressure plate (22) which is pressed against the conveying-cylinder-side wall (44) of the charging container (1), is made of a wear-resisting material and has two recesses corresponding to the inside diameter of the conveying cylinders (2).
7. A pump according to claim 6, characterized in that the pressure plate (22) is designed to be removable and is pressed against the rear wall (44) by means of clamping strips (9), which overlap it at its edge and are screwed to the rear wall (44) of the charging container (1).
8. A pump according to claim 7, characterized in that a sealirg ring (23) is arranged between the pressure plate (22) and the rear wall (44) of the charging container (1).
9. A pump according to any one of claims 1 to 8, characterized in that the wear-resisting ring (20), which overlaps, and is sealed off from, the swivel tube (5) has a sealing ring (21) lying in an annular groove.
10. A pump according to any one of claims 1 to 9, characterized in that the ends of the swivel tube (5), which is of the same inside diameter along its entire length, have, at their periphery, cylindrical recesses all of the same shape, in which is inserted a bearing bush (32) which bears, on the one hand, against the annular shoulder of the swivel tube (5), that is formed by the recess, and, on the other hand, against the resilient element (13) constituting the sealing ring and in which recesses engage the ciaws of a rocking lever (10) mounted on the rear wall (44) of the charging container (1).
11. A pump according to any one of claims 1 to 5 and 10, characterized in that a pressure sleeve (34), bearing against the periphery of the resilient element (33), is arranged between a bearing box (31) of the swivel bearing and the pressure flange of the connecting tube (4).
12. A pump according to claim 1, characterized in that the wear-resisting ring (20), sealed off from the swivel tube (5) by means of the sealing ring (21), is arranged to rotate on the end of the swivel tube.
13. A pump according to claims 1 and 10, characterized in that the rocking lever (10) is arranged on a control shaft (11), which is mounted in the rear wall (44) of the charging container (1), and on the rear end of which is keyed a control lever (12), which is actuated by two hydraulic cylinders (40), which extend along planes forming an acute angle with the rear wall (44) and which are mounted in hinge seats (42), formed by lugs on the rear wall (44), the piston rods of said cylinders engaging ball-and-socket joints (41) associated with the control lever (12).
EP80900342A 1979-02-01 1980-08-15 Twin-cylinder pump, in particular for pumping thick liquids Expired EP0022851B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2903749A DE2903749C2 (en) 1979-02-01 1979-02-01 Piston pump with an S-shaped swivel tube
DE2903749 1979-02-01

Publications (2)

Publication Number Publication Date
EP0022851A1 EP0022851A1 (en) 1981-01-28
EP0022851B1 true EP0022851B1 (en) 1983-02-09

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ID=6061868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80900342A Expired EP0022851B1 (en) 1979-02-01 1980-08-15 Twin-cylinder pump, in particular for pumping thick liquids

Country Status (8)

Country Link
US (1) US4382752A (en)
EP (1) EP0022851B1 (en)
JP (1) JPS55501189A (en)
AT (1) ATE2457T1 (en)
DE (2) DE2903749C2 (en)
ES (1) ES488121A1 (en)
IT (1) IT1129587B (en)
WO (1) WO1980001594A1 (en)

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Also Published As

Publication number Publication date
EP0022851A1 (en) 1981-01-28
DE2903749A1 (en) 1980-08-14
IT1129587B (en) 1986-06-11
JPS55501189A (en) 1980-12-25
IT8019603A0 (en) 1980-01-31
US4382752A (en) 1983-05-10
ES488121A1 (en) 1980-09-16
DE3061836D1 (en) 1983-03-17
DE2903749C2 (en) 1983-11-10
WO1980001594A1 (en) 1980-08-07
ATE2457T1 (en) 1983-03-15

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