EP0446206B1 - Procede et dispositif pour la commande d'une pompe a liquides epais a deux cylindres - Google Patents
Procede et dispositif pour la commande d'une pompe a liquides epais a deux cylindres Download PDFInfo
- Publication number
- EP0446206B1 EP0446206B1 EP89908162A EP89908162A EP0446206B1 EP 0446206 B1 EP0446206 B1 EP 0446206B1 EP 89908162 A EP89908162 A EP 89908162A EP 89908162 A EP89908162 A EP 89908162A EP 0446206 B1 EP0446206 B1 EP 0446206B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reversing
- delivery
- pump
- switch
- hydraulic
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract 4
- 238000007906 compression Methods 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000000717 retained effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000001960 triggered effect Effects 0.000 description 7
- 230000002441 reversible effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
- F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
- F04B7/0258—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an orbital movement, e.g. elbow-pipe type members
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
- F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
Definitions
- the invention relates to a method and a device for controlling a thick matter pump with two delivery cylinders opening into the material feed container via front openings, which can be actuated in push-pull mode by means of at least one hydraulic reversing pump and controlled by this hydraulic drive cylinder, with a feed cylinder arranged inside the material feed container and alternately on the inlet side the delivery cylinder can be connected and the other opening can be opened and the outlet side can be connected to a delivery line, hydraulically actuated pipe switch, whereby a reversal process of the pipe switch is triggered at the end of the pressure stroke in the delivery cylinders and the thick matter feed is interrupted during the changeover process.
- a method for controlling a two-cylinder slurry pump of this type is known (DE-OS 32 53 576), in which both the drive cylinder of the delivery cylinder and the hydraulic actuators of the pipe switch are acted upon directly by the pressure oil delivered by the hydraulic reversing pump.
- 2/2-way seat valves are installed in the lines of the main delivery circuit leading to the drive cylinders, which in turn can be controlled via a delay valve.
- the reversing pump is switched by an electrical end position signal at the end of each pressure stroke triggered. In order to avoid that the thick material previously sucked into the feed cylinder is not conveyed back into the material feed container.
- the delay valve is reversed so that the 2/2 directional seated valves are brought into their closed position, so that the pressure medium cannot flow from the reversing pump into the lines leading to the drive cylinders.
- a sufficient pressure builds up in the respective high-pressure line leading to the actuating members in order to connect the hydraulic actuating members of the pipe switch via a reversing valve.
- the object of the invention is to develop a method and a device for controlling a thick matter pump of the type specified at the beginning, with which hydraulic sequence control of the drive cylinders and the pipe switch is possible without fittings in the main oil circuit.
- a hydraulic or electrical end position signal to trigger the reversing process is tapped off on the pipe switch or on its hydraulic actuating members after each switchover process.
- the pressure oil supply to the actuators of the pipe switch is interrupted or reversed with compensation for the oil flow reversal in the main circuit.
- the hydraulic actuators of the pipe switch are expediently held under the action of the pressure generated by the reversing pump until a reversal process is triggered when the pressure stroke is ended while maintaining the conveying direction of the reversing pump.
- the delivery volume and / or the delivery pressure of the reversing pump is changed while maintaining the delivery direction when the reversing process of the pipe switch is triggered.
- the reversing pump can be briefly controlled to the maximum delivery volume and then readjusted in accordance with a predetermined delivery volume or delivery pressure
- the free-flow circuit according to the invention makes it possible for at least one additional reversing pump to be connected in parallel in the main circuit in the event of higher demands on the delivery rate, without additional measures, in particular without exchanging other fittings.
- a device for carrying out the method according to the invention advantageously has an adjusting and regulating mechanism for setting the delivery direction and, if appropriate, the delivery rate of the reversing pump, which can be acted upon with hydraulic or electrical end position signals which can be tapped at the pipe switch or at its hydraulic actuating members.
- the hydraulic actuators of the pipe switch can be acted upon with pressure oil branched from the valve-free main circuit leading from the reversing pump to the drive cylinders.
- an inversion element that responds to a return signal and reverses the delivery direction of the reversing pump is arranged in the circuit arrangement that transmits the hydraulic and electrical end position signals.
- a directional control valve which reverses the direction of the pressure oil supply is expediently arranged in the hydraulic line branching off from the main circuit and leading to the hydraulic actuators of the pipe switch, which directional control valve can be actuated via a pilot signal which responds to the conveying direction of the reversing pump.
- a further directional control valve which can be actuated by end position signals from the feed cylinder or from its drive cylinders, can be arranged, which can be switched over when a pressure stroke is ended and which triggers the reversing process of the pipe switch.
- the single figure shows the circuit of a control arrangement for a free-flow sequence control of drive cylinders and tubular switch cylinders in a single circuit arrangement.
- the thick matter pump essentially consists of two delivery cylinders 1, 1 ', the end openings 2, 2' of which open into a material feed container (not shown) and can be connected alternately to a delivery line 4 via a pipe switch 3 during the pressure stroke.
- the delivery cylinders 1, 1 ' are driven in a push-pull manner via hydraulic drive cylinders 5, 5' and the reversing hydraulic pump 6, which is designed as a swash plate axial piston pump in the exemplary embodiment shown.
- the delivery pistons 7,7 ' are connected to the pistons 8,8' of the drive cylinders 5,5 'via a common piston rod 9,9'.
- the drive cylinders 5, 5 ' are pressurized with pressure oil on the bottom side via the pressure lines 11, 11' of the main circuit with the aid of the reversing pump 6 and are hydraulically connected to one another at their rod-side end via a cross line 12.
- a pressure compensation line 14 which contains a check valve 13 and bridges the relevant drive piston 8 'in its end positions, is arranged at the two ends of the drive cylinder 5'.
- the direction of movement of the drive piston 8,8 'and thus the delivery piston 7,7' is reversed in that the swash plate 15 of the reversing pump 6 is triggered by a reversal signal is pivoted through the zero position and thus the direction of delivery of the pressure oil in the lines 11, 11 'of the main circuit changes in the free flow.
- the delivery rate of the reversing pump 6 is determined by the swivel angle of the swash plate 15 at a predetermined drive speed.
- the swash plate angle and thus the delivery rate is adjustable in proportion to a control pressure p s , which actuates the actuating cylinder 18 via the lines 16, 17 and 17 'and the reversing valve 20 located in the relevant line path.
- the control pressure p s can be varied in accordance with the switching states of the thick matter pump with hydraulic or electrical means, not shown.
- pressure regulators 70 and 71 are provided, the control inputs of which can be connected via a shuttle valve 72 or a directional valve 73 to the line 11, 11 'of the main circuit which carries high pressure or low pressure, respectively.
- the switchover of the pipe switch 3 takes place via the hydraulic cylinders 21, 21 ', which are preferably designed as plunger cylinders and which act directly on the pressure oil delivered by the reversing pump 6 via the lines 22, 22' branched off from the main circuit, the reversing valve 30 and the pressure lines 23, 23 ' will.
- the pilot control of the reversing valve 30 takes place hydraulically via the lines 24, 24 ′, which via the directional valves 31 and 40 with the control pressure of one together with the reversing pump 6 driven auxiliary pump 25 can be acted upon.
- the directional control valve 31 can be actuated via the electrically or optionally also hydraulically tapped end position signals x or xx of the drive cylinder 5, while the directional control valve 40 according to the pressure prevailing in the control lines 17, 17 'leading to the actuating cylinder 18 via the lines 28, 28' is reversible.
- the main control valve 20, which determines the delivery direction of the reversing pump 6, is actuated via end position signals of the pipe switch cylinders 21, 21 ', which can be tapped via the hydraulic lines 26, 26' and / or via electrical signal transmitters y.
- the auxiliary pump 25 also charges the closed main circuit via the check valves 75, 75 'and is protected by the pressure relief valve 74.
- the circuit arrangement shown leads to a sequential control of the drive cylinders 5.5 'and the tubular switch cylinders 21.21', which functions as follows:
- a reversal of the directional control valve 31 is triggered via the electrically tapped end position signal x.
- the reversing valve 30 is reversed while triggering a reversing process on the pipe switch cylinders 21, 21 ', the direction of delivery of the reversing pump 6 initially being retained and the drive piston 8, 8' over the Pressure oil in line 11 are kept in their respective end positions.
- the valve 20 is reversed via the corresponding end position signal.
- the pilot control on the actuating cylinder 18 changes, so that the swash plate 15 of the reversing pump 6 swivels with reversal of the conveying direction.
- the reversal signal is tapped in parallel between the valve 20 and the actuating cylinder 18 and switched to the pilot control of the valve 40 via the lines 28, 28 '.
- the valve 40 thus changes its position and thus ensures that the tube switch cylinders 21, 21 'maintain the previously assumed end position despite the reversal of the direction of delivery of the reversing pump 6.
- pilot valve 40 Since the pilot valve 40 responds to the reversal signal faster than the reversing pump 6, adjustable throttles 29, 29 'are arranged in the pilot lines 28, 28', which are adapted to the time behavior in order to avoid an undesired downshift of the pipe switch cylinders 21, 21 'in the course of the reversal of the conveying direction the reversing pump 6 cause the pilot valve 40 and thus the directional control valve 30 to slowly switch through.
- the return valve 32 upstream of the reversing valve 20 in the control lines 26, 26 ', the drive cylinders 5, 5' can be acted upon in the opposite manner if necessary, so that material is conveyed back from the delivery line into the storage container.
- the single-circuit arrangement described is above all: suitable for smaller or slow-running systems at who need the smallest possible number of hydraulic assemblies.
- a two-circuit sequential circuit is suitable, in which the diverter switch valve 30 is not connected to the main circuit via lines 22, 22 ', but to a separate hydraulic circuit. In the latter case, the directional control valve 40 can be omitted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Reciprocating Pumps (AREA)
Abstract
Claims (15)
- Procédé destiné à commander une pompe à liquides épais, ou matières visqueuses, avec deux vérins transporteurs débouchant par l'intermédiaire d'ouvertures frontales dans un récipient d'alimentation en matière et pouvant être actionnés en va-et-vient au moyen d'au moins une pompe hydraulique réversible et de vérins d'entraînement hydrauliques pilotés par l'intermédiaire de cette dernière, et un aiguillage tubulaire manoeuvrable hydrauliquement qui, disposé à l'intérieur du récipicent d'alimentation en matière, peut être raccordé, côté entrée, alternativement à l'une des ouvertures des vérins transporteurs en libérant chaque fois l'autre ouverture, et être mis en communication, côté sortie, avec un conduit transporteur, de telle sorte que chaque fois au terme d'une course de refoulement dans les cylindres transporteurs se déclenche un processus de changement de position de l'aiguillage tubulaire et qu'au cours de ce changement le transport du liquide épais est interrompu, alors que le sens de transport de la pompe réversible est conservé avec maintien d'une amenée d'huile hydraulique libre aux vérins d'entraînement et que les pistons des vérins d'entraînement sont maintenus contre leur, butée terminale sous l'action de la pression produite dans le circuit principal par la pompe réversible, le sens de transport de la pompe réversible n'étant inversé qu'au terme du processus de changement de position de l'aiguillage tubulaire, caractérisé en ce que pour le changement de position de l'aiguillage tubulaire de l'huile sous pression est amenée directement en dérivation à partir d'un circuit principal qui, dépourvu de pièces de robinetterie, s'étend de la pompe réversible aux vérins d'entraînement.
- Procédé selon la revendication 1, caractérisé en ce qu'au moment du déclenchement du processus de changement de position de l'aiguillage tubulaire le débit en volume et/ou la pression de refoulement de la pompe réversible sont amenés à varier tout en conservant le sens de transport.
- Procédé selon la revendication 1 ou 2, caractérisé en ce qu'au niveau de l'aiguillage tubulaire ou d'organes d'actionnement hydrauliques de ce dernier est recueilli, après chaque processus de changement, un signal de position terminale de préférence hydraulique ou électrique destiné à déclencher un processus d'inversion de la pompe réversible.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en cas de déclenchement du processus d'inversion l'amenée d'huile hydraulique aux organes d'actionnement de l'aiguillage tubulaire est, soit interrompue, soit inversée avec compensation de l'inversion du courant d'huile dans le circuit principal.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que lors du déclenchement du processus d'inversion la pompe réversible est amenée durant un court laps de temps à débiter un volume maximal et est ensuite réajustée conformément à un débit en volume ou une pression de refoulement préétabli.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au besoin au moins une autre pompe réversible est montée en parallèle avec la première pompe réversible.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les organes d'actionnement hydrauliques de l'aiguillage tubulaire sont maintenus en contact avec une butée terminale durant le transport du liquide épais, ou matière visqueuse, sous l'action de la pression produite par la pompe réversible et ce, jusqu'à ce qu'au terme de la course de compression un processus de changement de position soit déclenché avec maintien du sens de refoulement de la pompe réversible.
- Dispositif pour commander une pompe à liquides épais avec deux vérins transporteurs débouchant par l'intermédiaire d'ouvertures frontales dans un récipient d'alimentation en matière et pouvant être actionnés en va-et -vient au moyen d'au moins une pompe hydraulique réversible et de vérins d'entraînement hydrauliques pilotés par l'intermédiaire de cette dernière, et un aiguillage tubulaire manoeuvrable hydrauliquement qui, monté à l'intérieur du récipient d'alimentation en matière, peut être raccordé, côté entrée, alternativement à l'une des ouvertures des vérins transporteurs en libérant chaque fois l'autre ouverture et être mis en communication, côté sortie, avec un conduit transporteur, de telle sorte que chaque fois à l'issue d'une course de compression dans les vérins transporteurs est déclenché un processus de changement de position de l'aiguillage tubulaire, le transport de liquide épais pouvant être interrompu lors du processus de changement de position et l'amenée d'huile hydraulique libre aux vérins d'entraînement pouvant être maintenue avec conservation du sens de refoulement actuel de la pompe réversible et ce, de telle manière qu'au niveau de l'aiguillage tubulaire ou des organes d'actionnement hydrauliques de ce dernier puisse être recueilli, à l'issue de chaque processus de changement de position, un signal de position terminale destiné au déclenchement d'un processus d'inversion de la pompe réversible, caractérisé en ce que les organes d'actionnement hydrauliques (21, 21') de l'aiguillage tubulaire (3) peuvent être soumis à l'action d'huile hydraulique amenée en dérivation à partir du circuit principal (11, 11') qui, exempt de pièces de robinetterie, conduit de la pompe réversible (6) aux vérins d'entraînement (5, 5').
- Dispositif selon la revendication 8, caractérisé en ce que le débit en volume et/ou la pression de refoulement de la pompe réversible (6) peuvent, au cours du transport de liquides épais, d'une part et au cours du processus de changement de position de l'aiguillage, d'autre part, être réglés à des valeurs préétablies différentes.
- Dispositif selon la revendication 8 ou 9 comportant un mécanisme de manoeuvre et/ou de réglage (18) pour la pompe réversible (6), lequel mécanisme présente de préférence un distributeur pilotable (20) pour régler le sens de transport, caractérisé en ce que le mécanisme de manoeuvre et/ou de réglage (18), de préférence l'organe de pilotage du distributeur (20) de ce mécanisme, peut être soumis à des signaux de position terminale hydrauliques ou électriques (y) susceptibles d'être recueillis au niveau de l'aiguillage tubulaire (3) ou d'organes d'actionnement hydrauliques (21, 21') de ce dernier.
- Dispositif selon la revendication 10, caractérisé en ce que dans le montage (26, 26') transmettant les signaux de position terminale hydrauliques ou électriques est monté un organe inverseur (32) qui, réagissant à un signal de transport en retour, inverse le sens de transport de la pompe réversible (6).
- Dispositif selon l'une quelconque des revendications 8 à 11, caractérisé en ce que dans les conduits hydrauliques (22, 22') s'étendant en dérivation à partir du circuit principal (11, 11') et menant aux organes d'actionnement hydrauliques (21, 21') de l'aiguillage tubulaire (3) est monté un distributeur (30) qui inverse le sens de l'amenée d'huile hydraulique et peut être actionné par l'intermédiaire d'un distributeur pilote (40) réagissant au sens de refoulement de la pompe réversible (6).
- Dispositif selon la revendication 12, caractérisé en ce que le distributeur pilote (40) peut être actionné par l'intermédiaire d'un circuit d'étranglement ou de retardement (29, 29') adaptable au déroulement de l'inversion de la pompe réversible dans le temps.
- Dispositif selon la revendication 12 ou 13, caractérisé en ce que dans les conduits de pilotes (24, 24') menant au distributeur (30) est monté un autre distributeur (31) susceptible d'être manoeuvré par des signaux de position terminale (x, xx) des vérins transporteurs (1, 1') ou par les vérins d'entraînement (5, 5') de ces derniers.
- Dispositif selon l'une quelconque des revendications 8 à 14, caractérisé par un montage (16, ps) qui, destiné à faire varier le débit en volume et/ou la pression de refoulement de la pompe réversible (6), réagit à des signaux de position terminale (x, xx ; y) des vérins transporteurs (1, 1') et de l'aiguillage tubulaire (3) et est relié au mécanisme de manoeuvre et/ou de réglage (18) de la pompe réversible.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3840892A DE3840892A1 (de) | 1988-12-05 | 1988-12-05 | Verfahren und vorrichtung zur steuerung einer zweizylinder-dickstoffpumpe |
| DE3840892 | 1988-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0446206A1 EP0446206A1 (fr) | 1991-09-18 |
| EP0446206B1 true EP0446206B1 (fr) | 1993-06-16 |
Family
ID=6368470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89908162A Expired - Lifetime EP0446206B1 (fr) | 1988-12-05 | 1989-07-11 | Procede et dispositif pour la commande d'une pompe a liquides epais a deux cylindres |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5344290A (fr) |
| EP (1) | EP0446206B1 (fr) |
| JP (1) | JPH04501897A (fr) |
| DE (2) | DE3840892A1 (fr) |
| WO (1) | WO1990006444A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997018395A1 (fr) * | 1995-11-13 | 1997-05-22 | Putzmeister Aktiengesellschaft | Procede et dispositif pour commander une pompe a liquides epais a deux cylindres |
| WO2002008605A1 (fr) | 2000-07-24 | 2002-01-31 | Putzmeister Aktiengesellschaft | Pompe a liquides epais |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4141108A1 (de) * | 1991-12-13 | 1993-06-17 | Putzmeister Maschf | Einrichtung zur regelung des ausgangsdruckes einer verstellpumpe |
| DE10150467A1 (de) * | 2001-10-16 | 2003-04-17 | Putzmeister Ag | Dickstoffpumpe mit Fördermengenregelung |
| US7175394B2 (en) * | 2001-12-21 | 2007-02-13 | Weatherford/Lamb, Inc. | Hydraulic multiphase pump |
| US6592334B1 (en) * | 2001-12-21 | 2003-07-15 | Weatherford/Lamb, Inc. | Hydraulic multiphase pump |
| US6736376B1 (en) * | 2002-03-19 | 2004-05-18 | Delisle Gilles L. | Anti-detonation fuel delivery system |
| DE102004015419A1 (de) * | 2004-03-26 | 2005-10-13 | Putzmeister Ag | Vorrichtung und Verfahren zur Steuerung einer Dickstoffpumpe |
| WO2005121555A1 (fr) * | 2004-06-07 | 2005-12-22 | Hunter Hitech Pty Ltd | Ensemble pompe |
| DE102005008217A1 (de) * | 2005-02-22 | 2006-08-31 | Putzmeister Ag | Hydraulikantrieb, insbesondere für Zweizylinder-Dickstoffpumpen |
| IT1393038B1 (it) * | 2009-02-09 | 2012-04-11 | Imer Int Spa | Pompa per clacestruzzo |
| DE102011083874A1 (de) * | 2011-09-30 | 2013-04-04 | Putzmeister Engineering Gmbh | Hydrauliksystem mit Saug-Rücklauffilter |
| CN102979692B (zh) * | 2012-05-22 | 2014-08-06 | 北汽福田汽车股份有限公司 | 串联油缸装置及其控制方法和泵送装置 |
| CN103114983B (zh) * | 2012-06-27 | 2014-01-01 | 中联重科股份有限公司 | 粘稠物料双缸泵的泵送行程控制方法及粘稠物料泵送设备 |
| CN108146877A (zh) * | 2017-12-15 | 2018-06-12 | 太仓佳锐精密模具有限公司 | 一种可限位的料筒下转进控制装置 |
| DE102018130480A1 (de) * | 2018-11-30 | 2020-06-04 | Liebherr-Betonpumpen Gmbh | Zweizylinder-Dickstoffpumpe |
| EP4395977A1 (fr) | 2021-09-03 | 2024-07-10 | Readily3D SA | Procédé de correction analytique numérique d'une réactivité de matériau photosensible dans la fabrication additive |
| WO2025223658A1 (fr) | 2024-04-25 | 2025-10-30 | Ecole Polytechnique Federale De Lausanne (Epfl) | Système et procédé de fabrication additive volumétrique à haut débit et à haute résolution utilisant des hologrammes générés par ordinateur à multiplexage dans le temps |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3327641A (en) * | 1965-03-08 | 1967-06-27 | Air Placement Equipment Co Inc | Concrete pump |
| FR2040855A5 (fr) * | 1969-04-23 | 1971-01-22 | Richier Sa | |
| US4036564A (en) * | 1971-08-02 | 1977-07-19 | Richards John A | Concrete pumping apparatus |
| GB1452561A (en) * | 1973-11-16 | 1976-10-13 | Fogt Indmasch | Apparatus for pumping wet concrete |
| IT1014858B (it) * | 1974-06-07 | 1977-04-30 | Ripamonti E | Valvola distributrice a tre vie per pompe a due cilindri per cal cestruzzo |
| DE3243576A1 (de) * | 1982-11-25 | 1984-05-30 | Karl Dipl.-Ing. 7000 Stuttgart Schlecht | Zweizylinder-kolbenpumpe, insbesondere fuer dickstoffe |
| JPS59206683A (ja) * | 1983-05-09 | 1984-11-22 | Mitsubishi Heavy Ind Ltd | コンクリ−トポンプ |
| DE3346820A1 (de) * | 1983-12-23 | 1985-07-04 | Linde Ag, 6200 Wiesbaden | Hydrostatischer antrieb fuer eine betonkolbenpumpe |
-
1988
- 1988-12-05 DE DE3840892A patent/DE3840892A1/de not_active Ceased
-
1989
- 1989-07-11 JP JP1507739A patent/JPH04501897A/ja active Pending
- 1989-07-11 EP EP89908162A patent/EP0446206B1/fr not_active Expired - Lifetime
- 1989-07-11 WO PCT/EP1989/000805 patent/WO1990006444A1/fr not_active Ceased
- 1989-07-11 DE DE8989908162T patent/DE58904753D1/de not_active Expired - Fee Related
- 1989-07-11 US US07/690,915 patent/US5344290A/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997018395A1 (fr) * | 1995-11-13 | 1997-05-22 | Putzmeister Aktiengesellschaft | Procede et dispositif pour commander une pompe a liquides epais a deux cylindres |
| WO2002008605A1 (fr) | 2000-07-24 | 2002-01-31 | Putzmeister Aktiengesellschaft | Pompe a liquides epais |
| KR100803842B1 (ko) * | 2000-07-24 | 2008-02-14 | 푸츠마이스터 아크티엔게젤샤프트 | 고밀도재료펌프 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0446206A1 (fr) | 1991-09-18 |
| US5344290A (en) | 1994-09-06 |
| JPH04501897A (ja) | 1992-04-02 |
| DE3840892A1 (de) | 1990-06-07 |
| WO1990006444A1 (fr) | 1990-06-14 |
| DE58904753D1 (de) | 1993-07-22 |
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