EP2333335B1 - Portable hydraulic pump group for operating tools - Google Patents

Portable hydraulic pump group for operating tools Download PDF

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Publication number
EP2333335B1
EP2333335B1 EP10014964A EP10014964A EP2333335B1 EP 2333335 B1 EP2333335 B1 EP 2333335B1 EP 10014964 A EP10014964 A EP 10014964A EP 10014964 A EP10014964 A EP 10014964A EP 2333335 B1 EP2333335 B1 EP 2333335B1
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EP
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Prior art keywords
valve
cylinder
oil
return flow
tool
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EP10014964A
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German (de)
French (fr)
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EP2333335A1 (en
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Arnold Reichegger
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Intercable SRL
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    • 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
    • F04B3/00—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
    • F04B3/003—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage with two or more pistons reciprocating one within another, e.g. one piston forning cylinder of the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • 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
    • F04B25/00—Multi-stage pumps
    • 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
    • F04B5/00—Machines or pumps with differential-surface pistons

Definitions

  • the invention relates to a hydraulic pump group of the compact portable type which is operated by a rechargeable and replaceable battery to drive different, connected via a hose to the pump, hydraulic tools;
  • the control of the pump is done by means of rotary and / or push buttons which are provided on the pump itself or by remote control with push button panel and electrical connection cable.
  • These pumps are usually equipped with a built-in battery charger, with a tank for the oil and a display to indicate the parameters entered for operating the pump, for displaying the operating values and / or operating diagrams, reporting malfunctions or work irregularities and displaying various set or user-entered work programs.
  • the pump groups of this type feed the cylinder of the tool for power stroke with oil under low pressure but high throughput to achieve rapid movement of the tool, for the movement which takes place after contact of the tool with the material to be compressed, deformed or cut, the supply is under high pressure.
  • a valve for the return of the oil from the cylinder of the tool is provided in the tank, which has a relatively small flow area for which there is no change, which has relatively long opening times brings. This negatively affects working hours, especially when a relatively large stroke tool is used to make cuts or deformations on workpieces which will have a relatively small cross-section.
  • the known pump groups have the disadvantage that they do not allow the stepless change in the pressure in the tool cylinder during the working phase, which would be advantageous, for example, for the consideration of cold flow, or the Walkens, the material to be processed.
  • a hydraulic supply unit is known in which, between the pump and the pressure output, a pressure booster is arranged which is mechanically fixedly connected to the pump.
  • the pressure booster consists of a stepped piston which is operated by a part of the amount of liquid moved by the pump to provide a smaller amount of liquid under an increased pressure.
  • the low pressure is achieved by a pressure reducing valve provided between the outlet of the pressure generator and a low pressure port.
  • the invention has as its object to create a pump group of the type described above which makes it possible to achieve short working times and to adapt the working phase to the properties dictated by cold flow, or by walking, of the material to be processed.
  • the invention proposes the use of a reflux valve which, be it manually or by means of an electric motor, is actuated, the flow cross-section of the valve, in the open position is relatively large to a rapid outflow of the oil from the tool cylinder and thus very short opening times to reach for the tool.
  • said flow cross-section is variable such that the same valve can also be used as a valve for adjusting the pressure and working times during the supply of the tool cylinder, which can be operated at low pressure and also at high pressure. This can be advantageous in order, in particular in the case of machining which take place by plastic deformation of certain materials, to be able to adapt the times, or the speed, of the deformation to the specific cold flow or rolling properties of the material.
  • the reflux valve according to the invention is provided with a closure body which is movable in the seat of the valve housing, the closure body is connected to a small piston which ends with a coaxial plunger on whose end an eccentric disc driven by a motor acts or which can be actuated manually.
  • the said small piston slides within a cylinder which is coaxially fixed to the valve body.
  • This cylinder is, in the area which corresponds to that end of the small piston which the valve closure body opposite, provided with a chamber which is hydraulically connected to the supply line of the tool cylinder. This causes the pressure acting on the closure body of the valve from the side of the incoming oil flowing through the inlet opening to be compensated by the same pressure of the oil which is directed into the chamber of the cylinder containing the small piston.
  • At least one tared safety valve, a pressure gauge and any, connected to the electronic control of the pump group, pressure and / or flow probes are provided in the circuit of the pump group of the invention.
  • the Fig. 1 shows a simplified functional diagram of the pump group according to the invention which is connected to the hydraulic cylinder of a tool, while the pump supplies the tool cylinder with oil under low pressure to achieve the rapid ejection of the tool piston.
  • the Fig. 2 shows the same in Fig. 1 illustrated functional diagram wherein the pump supplies the tool cylinder with oil under high pressure to reach the output of the tool piston.
  • Fig. 3 shows the same in Fig. 1 illustrated functional diagram wherein the reflux valve according to the invention is manually operated to achieve by the action of a spring, the return flow of the oil from the tool cylinder in the direction of the tank.
  • Fig. 4 shows the same in Fig. 1 illustrated functional diagram wherein the reflux valve according to the invention is actuated by a stepper motor operated eccentric disc to achieve a more or less rapid reflux of the oil from the tool cylinder in the direction of the tank.
  • the Fig. 5 shows the reflux valve according to the invention in a sectional view according to a vertical sectional plane which includes the vertical axis of the valve body and the horizontal axis of the eccentric disc for the actuation of the valve; the valve is shown in a position in which the flow is completely interrupted.
  • the Fig. 6 shows the same in Fig. 5 illustrated reflux valve, however, in partial sectional view according to the in Fig. 5 shown section plane VI-VL.
  • the pump group essentially consists of a pump P, an oil tank 1, intake valves V1, V2, an exhaust valve V3, a switching valve U, a return valve A and a tared safety valve S.
  • the pump group feeds the hydraulic cylinder 7 with piston 7a Tools which are connected by hydraulic hose to the pump group.
  • the pump P is a pump with stepped piston 3p, 6p and corresponding step cylinder 4p, 7p; the piston is moved in the direction C by a driven by an electric motor 2r eccentric 2 to generate pressure while being moved in the opposite direction to suck by cylindrical compression springs 5p, 8p.
  • the intake valves V1, V2 and also the exhaust valve V3 are of known type and ensure the required flow direction of the oil during the alternating suction and ejection movements C of the piston.
  • the switching valve U is of the type which is actuated by the oil pressure acting on a small piston U1, which is connected to the closure body of the valve U.
  • the pump P feeds the cylinder 7 of the tool which is filled by the oil which is moved by the stepped piston 3p with a larger piston diameter.
  • a quick ejection 7c of the piston 7a of the tool is achieved, so that the time of free movement of the tool until its stop on the workpiece to be machined ( Fig.1 ) To shorten.
  • the invention proposes in front of the small cylinder 3a in which the small piston 2 a runs, to connect with the inlet / outlet line of the cylinder 7 of the tool c, it is achieved that the pressure acting on the closure body 1 x of the valve 1 a pressure is canceled by the pressure in the small cylinder 3 a on the small Piston 2a acts.
  • the manual operation of the return valve A is mainly in cases when, under special circumstances or for reasons of unforeseen circumstances or for safety reasons, an immediate opening of the tool must be made.
  • the reflux valve A is opened by electronic control by actuation 5r of an eccentric disk 5a which is driven by an electric motor B (FIG. Fig. 4 . 5 ), even in this case, in order to displace 2s of the small piston 2a inside the small cylinder 3a, a force which is slightly larger than the pressure of the spring acting on the closure body 1 x of the valve 1a and the friction is required between the small piston 2a and the corresponding cylinder 3a, this is because the acting on the closure body 1x of the valve 1a pressure is compensated by the pressure of the oil which flows into the small cylinder 3a a.
  • the reflux valve A according to the invention because of the above-mentioned pressure compensation, have a remarkable cross section for the flow of oil so that short times for the opening of the tools W, or high speeds for the retrieval 7r of the piston 7a can be achieved without high forces 1x are required for the operation of the closure body.
  • the displacement 2s of the plunger 4a together with small piston 2a and closure body 1x of the valve by progressive rotation 5r of the eccentric disk 5a can be carried out stepwise, whereby an extremely rapid emptying but also an optional change in the emptying speeds and thus the opening speed of the tools W is possible.
  • the invention allows the gradual opening of the reflux valve, including the possibility of continuous change in the flow cross section for the oil, also a change in pressure, or the times during the phase of supply under high pressure and low pressure.
  • the stepless manual operation 6b or the continuous operation by rotation 5r of the eccentric 5a of the plunger 4a together with a small cylinder 2a and closure body 1x of the valve in the opening direction 2s achievable by the holder of the motor unit B together with eccentric 5a which carries a bearing 5k, together with mounted in a holder 2h bearings 2k, parallel to the axis of said plunger 4a parallel to the axis of said plunger 4a is displaceable.
  • the said support member 2h is displaceably guided on the outside of a pipe member 2m of the valve A mounted on the body of the pump P and the heads of the bolt 1g projecting in parallel from the body of the pump P in a position of maximum axial distance from the shutter body 1x of the valve which is determined by the pressure of, on the outside of said pin 1 g attached, cylindrical compression springs 1 f, retained.
  • manual actuation 6b for example by means of push button or lever 6a
  • the axial displacement of the support member 2h takes place together with the motor B together with the eccentric disc 5a by compressing the springs 1f, this results in the displacement of the plunger 2s 4a together Lock body 1x of the valve causing the opening of the same.
  • the invention does not exclude a fixed mounting of the motor B including eccentric disc, without sliding support member 2h and springs 1f and the manual operation 2s of the plunger 4a or the small piston 2a.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Surgical Instruments (AREA)

Description

Die Erfindung bezieht sich auf eine hydraulische Pumpengruppe von der kompakten tragbaren Art welche von einer aufladbaren und austauschbaren Batterie betrieben wird um unterschiedliche, über einen Schlauch mit der Pumpe verbundene, Hydraulikwerkzeuge anzutreiben; die Steuerung der Pumpe erfolgt mittels Dreh- und/oder Druckknöpfe welche an der Pumpe selbst vorgesehen sind oder mittels Fernbedienung mit Druckknopftafel und elektrischem Verbindungskabel. Diese Pumpen sind üblicherweise mit einem eingebauten Ladegerät für die Batterie, mit einem Tank für das Öl und einem Display zwecks Anzeige der eingegebenen Parameter für den Betrieb der Pumpe, zwecks Anzeige der Betriebswerte und/oder Betriebsdiagramme, Meldung von Störungen oder von Arbeitsunregelmäßigkeiten und Anzeige verschiedener eingestellter oder vom Anwender eingegebener Arbeitsprogramme, ausgestattet.The invention relates to a hydraulic pump group of the compact portable type which is operated by a rechargeable and replaceable battery to drive different, connected via a hose to the pump, hydraulic tools; The control of the pump is done by means of rotary and / or push buttons which are provided on the pump itself or by remote control with push button panel and electrical connection cable. These pumps are usually equipped with a built-in battery charger, with a tank for the oil and a display to indicate the parameters entered for operating the pump, for displaying the operating values and / or operating diagrams, reporting malfunctions or work irregularities and displaying various set or user-entered work programs.

Die Pumpengruppen dieser Art speisen den Zylinder des Werkzeuges zwecks Arbeitshub mit Öl unter Niederdruck aber mit hohem Durchsatz um eine schnelle Bewegung des Werkzeuges zu erreichen, für die Bewegung welche nach dem Kontakt des Werkzeuges mit dem zu komprimierenden, zu verformenden oder zu schneidenden Werkstoff stattfindet, erfolgt die Speisung unter Hochdruck. Für das erneute Öffnen des Werkzeuges infolge Durchführung eines Schnittes oder einer Druckverformung, ist ein Ventil für den Rückfluss des Öls vom Zylinder des Werkzeuges in den Tank vorgesehen, welches über einen relativ kleinen Durchflussquerschnitt verfügt für welchen keinerlei Veränderung vorgesehen ist, was relativ lange Öffnungszeiten mit sich bringt. Dies wirkt sich negativ auf die Arbeitszeiten aus, insbesondere wenn ein Werkzeug mit relativ großem Hub für die Durchführung von Schnitten oder Verformungen an Werkstücken verwendet wird welche relativ kleinen Querschnitt haben. Weiters weisen die bekannten Pumpengruppen den Nachteil auf dass sie nicht die stufenlose Veränderung des Druckes im Werkzeugzylinder während der Arbeitsphase ermöglichen was, z.B. für die Berücksichtigung des Kaltfließens, bzw. des Walkens, des zu bearbeitenden Werkstoffes vorteilhaft wäre.The pump groups of this type feed the cylinder of the tool for power stroke with oil under low pressure but high throughput to achieve rapid movement of the tool, for the movement which takes place after contact of the tool with the material to be compressed, deformed or cut, the supply is under high pressure. For the reopening of the tool due to making a cut or a compression deformation, a valve for the return of the oil from the cylinder of the tool is provided in the tank, which has a relatively small flow area for which there is no change, which has relatively long opening times brings. This negatively affects working hours, especially when a relatively large stroke tool is used to make cuts or deformations on workpieces which will have a relatively small cross-section. Furthermore, the known pump groups have the disadvantage that they do not allow the stepless change in the pressure in the tool cylinder during the working phase, which would be advantageous, for example, for the consideration of cold flow, or the Walkens, the material to be processed.

Aus der US 2005/265859 A1 ist eine hydraulische Versorgungseinheit bekannt bei welcher, zwischen der Pumpe und dem Druckausgang ein Druckverstärker angeordnet ist der mit der Pumpe mechanisch fest verbunden ist. Der Druckverstärker besteht aus einem Stufenkolben welcher durch einen Teil der von der Pumpe bewegten Flüssigkeitsmenge betrieben wird um eine kleinere Flüssigkeitsmenge unter einem erhöhten Druck bereit zu stellen. Der Niederdruck wird durch ein, zwischen dem Ausgang des Druckerzeugers und einem Niederdruckanschluss vorgesehenen Druckminderungsventil erreicht. Diese Anordnung ermöglicht es nicht den Druck, bzw. die Durchflussmenge, für ein hydraulisch betriebenes Werkzeug, den jeweils vorgegebenen Eigenschaften des zu bearbeitenden Werkstoffes, bzw. den unterschiedlichen Arbeitsphasen, anzupassen um dadurch eine effiziente und zeitsparende Bearbeitung zu erzielen.From the US 2005/265859 A1 is a hydraulic supply unit is known in which, between the pump and the pressure output, a pressure booster is arranged which is mechanically fixedly connected to the pump. The pressure booster consists of a stepped piston which is operated by a part of the amount of liquid moved by the pump to provide a smaller amount of liquid under an increased pressure. The low pressure is achieved by a pressure reducing valve provided between the outlet of the pressure generator and a low pressure port. This arrangement does not allow the pressure, or the flow rate, for a hydraulically operated tool, the respective predetermined properties of the material to be machined, or to adapt the different phases of work, thereby achieving an efficient and time-saving processing.

Die Erfindung stellt sich die Aufgabe eine Pumpengruppe der vorher beschriebenen Art zu schaffen welche es ermöglicht kurze Arbeitszeiten zu erreichen und die Arbeitsphase an die vom Kaltfließens, bzw. vom Walken, des zu bearbeitenden Werkstoffs vorgegebenen Eigenschaften anzupassen.The invention has as its object to create a pump group of the type described above which makes it possible to achieve short working times and to adapt the working phase to the properties dictated by cold flow, or by walking, of the material to be processed.

Zur Lösung dieser Aufgabe schlägt die Erfindung den Einsatz eines Rückflussventils vor welches, sei es händisch als auch mittels Elektromotor, betätigt wird, wobei der Durchflussquerschnitt des Ventils, in Offenstellung relativ groß ist um einen schnellen Abfluss des Öls aus dem Werkzeugzylinder und somit sehr kurze Öffnungszeiten für das Werkzeug zu erreichen. Der besagte Durchflussquerschnitt ist jedoch erfindungsgemäß derart veränderbar dass das selbe Ventil auch als Ventil für die Einstellung des Drucks und der Arbeitszeiten während der Speisung des Werkzeugzylinders nutzbar ist, wobei dieser mit Niederdruck und auch mit Hochdruck betrieben werden kann. Dies kann vorteilhaft sein um, insbesondere im Fall von Bearbeitungen welche durch plastische Verformung an bestimmten Werkstoffen stattfinden, die Zeiten, bzw. die Geschwindigkeit, der Verformung an die spezifischen Kaltfluss-, bzw. Walkeigenschaften des Werkstoffes anpassen zu können.To solve this problem, the invention proposes the use of a reflux valve which, be it manually or by means of an electric motor, is actuated, the flow cross-section of the valve, in the open position is relatively large to a rapid outflow of the oil from the tool cylinder and thus very short opening times to reach for the tool. However, according to the invention, said flow cross-section is variable such that the same valve can also be used as a valve for adjusting the pressure and working times during the supply of the tool cylinder, which can be operated at low pressure and also at high pressure. This can be advantageous in order, in particular in the case of machining which take place by plastic deformation of certain materials, to be able to adapt the times, or the speed, of the deformation to the specific cold flow or rolling properties of the material.

Das erfindungsgemäße Rückflussventil ist mit einem im Sitz des Ventilgehäuse beweglichen Verschlusskörper versehen, der Verschlusskörper ist mit einem kleinen Kolben verbunden welcher mit einem koaxialen Stößel endet auf dessen Ende eine von einem Motor angetriebene Exzenterscheibe wirkt, bzw. welcher händisch betätigt werden kann. Der besagte kleine Kolben gleitet innerhalb eines Zylinders welcher koaxial am Ventilkörper befestigt ist. Dieser Zylinder ist, im Bereich welcher jenem Ende des kleinen Kolbens entspricht welcher dem VentilVerschlusskörper gegenüberliegt, mit einer Kammer versehen welche hydraulisch mit der Versorgungsleitung des Werkzeugzylinders verbunden ist. Dies bewirkt dass der Druck welcher auf den Verschlusskörper des Ventils von der Seite des einlaufenden durch die Einlauföffnung fließenden Öls wirkt, vom selben Druck des Öls ausgeglichen wird welches in die Kammer des Zylinders welche den kleinen Kolben enthält, geleitet wird. Auf diese Weise ist für die Betätigung des Verschlusskörpers, z.B. um ihn vom Sitz anzuheben, eine minimale Kraft erforderlich welche nur vom Druck der Feder welche auf den Verschlusskörper wirkt und von der Reibung zwischen Zylinder und kleinem Kolben bestimmt wird. Dies bringt den Vorteil mit sich, dass einerseits ein beachtlicher Querschnitt für den Durchfluss des abfließenden Öls vorgesehen werden kann und anderseits dass der Verschlusskörper mit relativ großem Querschnitt unter Anwendung einer minimalen Kraft betätigt werden kann weil die Kraft des Öldrucks welche auf den Verschlusskörper wirkt, durch den Öldruck welcher auf den kleinen, mit dem Verschlusskörper verbundenen Kolben wirkt, ausgeglichen wird.The reflux valve according to the invention is provided with a closure body which is movable in the seat of the valve housing, the closure body is connected to a small piston which ends with a coaxial plunger on whose end an eccentric disc driven by a motor acts or which can be actuated manually. The said small piston slides within a cylinder which is coaxially fixed to the valve body. This cylinder is, in the area which corresponds to that end of the small piston which the valve closure body opposite, provided with a chamber which is hydraulically connected to the supply line of the tool cylinder. This causes the pressure acting on the closure body of the valve from the side of the incoming oil flowing through the inlet opening to be compensated by the same pressure of the oil which is directed into the chamber of the cylinder containing the small piston. In this way, for the operation of the closure body, for example, to lift it from the seat, a minimal force is required which only by the pressure of the spring which acts on the closure body and is determined by the friction between the cylinder and small piston. This has the advantage that on the one hand a considerable cross section for the flow of the outflowing oil can be provided and on the other hand that the closure body with a relatively large cross section can be actuated using a minimal force because of the force of the oil pressure which acts on the closure body, through the oil pressure which acts on the small, connected to the closure body piston is compensated.

Natürlich sind im Kreislauf der erfindungsgemäßen Pumpengruppe mindestens ein tariertes Sicherheitsventil, ein Manometer und eventuelle, mit der elektronischen Steuerung der Pumpengruppe verbundene, Druck- und/oder Durchflusssonden vorgesehen.Of course, at least one tared safety valve, a pressure gauge and any, connected to the electronic control of the pump group, pressure and / or flow probes are provided in the circuit of the pump group of the invention.

Die Erfindung wird anschließend anhand eines, in den beigelegten Zeichnungen schematisch dargestellten, vorzuziehenden Ausführungsbeispieles einer erfindungsgemäßen hydraulischen Pumpengruppe für die Betätigung von Werkzeugen näher erklärt, dabei erfüllen die Zeichnungen rein erklärenden, nicht begrenzenden, Zweck.The invention will be explained in more detail with reference to a, in the attached drawings schematically illustrated, preferable embodiment of a hydraulic pump assembly according to the invention for the operation of tools, the drawings meet purely explanatory, non-limiting, purpose.

Die Fig. 1 zeigt ein vereinfachtes Funktionsschema der erfindungsgemäßen Pumpengruppe welche an den Hydraulikzylinder eines Werkzeuges angeschlossen ist, dabei versorgt die Pumpe den Werkzeugzylinder mit Öl unter Niederdruck um den schnellen Ausstoß des Werkzeugkolbens zu erreichen.The Fig. 1 shows a simplified functional diagram of the pump group according to the invention which is connected to the hydraulic cylinder of a tool, while the pump supplies the tool cylinder with oil under low pressure to achieve the rapid ejection of the tool piston.

Die Fig. 2 zeigt das selbe in Fig. 1 dargestellte Funktionsschema wobei die Pumpe den Werkzeugzylinder mit Öl unter Hochdruck versorgt um den Ausstoß des Werkzeugkolbens zu erreichen.The Fig. 2 shows the same in Fig. 1 illustrated functional diagram wherein the pump supplies the tool cylinder with oil under high pressure to reach the output of the tool piston.

Die Fig. 3 zeigt das selbe in Fig. 1 dargestellte Funktionsschema wobei das erfindungsgemäße Rückflussventil händisch betätigt wird um durch die Wirkung einer Feder den Rückfluss des Öls aus dem Werkzeugzylinder in Richtung Tank zu erreichen.The Fig. 3 shows the same in Fig. 1 illustrated functional diagram wherein the reflux valve according to the invention is manually operated to achieve by the action of a spring, the return flow of the oil from the tool cylinder in the direction of the tank.

Die Fig. 4 zeigt das selbe in Fig. 1 dargestellte Funktionsschema wobei das erfindungsgemäße Rückflussventil durch eine über Schrittmotor betriebene Exzenterscheibe betätigt wird um einen mehr oder weniger schnellen Rückfluss des Öls aus dem Werkzeugzylinder in Richtung Tank zu erreichen.The Fig. 4 shows the same in Fig. 1 illustrated functional diagram wherein the reflux valve according to the invention is actuated by a stepper motor operated eccentric disc to achieve a more or less rapid reflux of the oil from the tool cylinder in the direction of the tank.

Die Fig. 5 zeigt das erfindungsgemäße Rückflussventil in Schnittdarstellung gemäß einer vertikalen Schnittebene welche die vertikale Achse des Ventilkörpers und die horizontale Achse der Exzenterscheibe für die Betätigung des Ventils beinhaltet; das Ventil ist in einer Position dargestellt in welcher der Durchfluss vollkommen unterbrochen ist.The Fig. 5 shows the reflux valve according to the invention in a sectional view according to a vertical sectional plane which includes the vertical axis of the valve body and the horizontal axis of the eccentric disc for the actuation of the valve; the valve is shown in a position in which the flow is completely interrupted.

Die Fig. 6 zeigt das selbe in Fig. 5 dargestellte Rückflussventil jedoch in teilweiser Schnittdarstellung gemäß der in Fig. 5 gezeigten Schnittebene VI-VL.The Fig. 6 shows the same in Fig. 5 illustrated reflux valve, however, in partial sectional view according to the in Fig. 5 shown section plane VI-VL.

Die Pumpengruppe besteht wesentlich aus einer Pumpe P, einem Öltank 1, aus Ansaugventilen V1, V2, aus einem Auslassventil V3, aus einem Umschaltventil U, aus einem Rückflussventil A und aus einem tarierten Sicherheitsventil S. Die Pumpengruppe speist den Hydraulikzylinder 7 mit Kolben 7a von Werkzeugen welche mittels Hydraulikschlauch mit der Pumpengruppe verbunden sind.The pump group essentially consists of a pump P, an oil tank 1, intake valves V1, V2, an exhaust valve V3, a switching valve U, a return valve A and a tared safety valve S. The pump group feeds the hydraulic cylinder 7 with piston 7a Tools which are connected by hydraulic hose to the pump group.

Die Pumpe P ist eine Pumpe mit Stufenkolben 3p, 6p und entsprechendem Stufenzylinder 4p, 7p; der Kolben wird in Richtung C durch eine von einem Elektromotor angetriebene 2r Exzenterscheibe 2 bewegt um Druck zu erzeugen während er in Gegenrichtung um anzusaugen durch zylindrische Druckfedern 5p, 8p bewegt wird. Die Ansaugventile V1, V2 und auch das Auslassventil V3 sind von bekannter Art und sichern die erforderliche Flussrichtung des Öls während der abwechselnden Ansaug- und Ausstoßbewegungen C des Kolbens.The pump P is a pump with stepped piston 3p, 6p and corresponding step cylinder 4p, 7p; the piston is moved in the direction C by a driven by an electric motor 2r eccentric 2 to generate pressure while being moved in the opposite direction to suck by cylindrical compression springs 5p, 8p. The intake valves V1, V2 and also the exhaust valve V3 are of known type and ensure the required flow direction of the oil during the alternating suction and ejection movements C of the piston.

Das Umschaltventil U ist von der Art welche vom Öldruck betätigt wird der auf einen kleinen Kolben U1 wirkt, wobei dieser mit dem Verschlusskörper des Ventils U verbunden ist. Bei geschlossenem Ventil U, speist die Pumpe P den Zylinder 7 des Werkzeugs welcher vom Öl gefüllt wird das vom Stufenkolben 3p mit größerem Kolbendurchmesser bewegt wird. Durch die Speisung unter Niederdruck aber mit beachtenswerter Fördermenge wird ein schneller Ausstoß 7c des Kolbens 7a des Werkzeugs erreicht um so die Zeit der freien Bewegung des Werkzeuges bis zu dessen Anschlag am zu bearbeitenden Werkstück (Fig.1) zu verkürzen.The switching valve U is of the type which is actuated by the oil pressure acting on a small piston U1, which is connected to the closure body of the valve U. When the valve U is closed, the pump P feeds the cylinder 7 of the tool which is filled by the oil which is moved by the stepped piston 3p with a larger piston diameter. By feeding under low pressure but with noteworthy flow rate, a quick ejection 7c of the piston 7a of the tool is achieved, so that the time of free movement of the tool until its stop on the workpiece to be machined ( Fig.1 ) To shorten.

Sobald das Werkzeug dem mechanischen Widerstand des zu bearbeitenden Werkstückes begegnet, erfolgt im Zylinder 7 des Werkzeugs und in den entsprechenden Verbindungsleitungen ein Druckanstieg wodurch das Umschaltventil U geöffnet wird, dabei wirkt das Öl auf den kleinen Kolben U1 des Ventils U indem die entgegenwirkende Kraft der Ventilfeder übertroffen wird. Die Öffnung des Umschaltventils U bewirkt den Durchfluss des Öls welches vom Stufenkolben 6p mit kleinerem Durchmesser der Pumpe P angesaugt wird und somit die Speisung des Zylinders 7 des Werkzeugs W mit Öl unter hohem Druck welcher somit den Ausstoß 7c des Kolbens 7a mit kleinerer Geschwindigkeit aber mit größerer auf das Werkstück wirkender Kraft bewirkt (Fig. 2).As soon as the tool meets the mechanical resistance of the workpiece to be machined, a pressure increase takes place in the cylinder 7 of the tool and in the corresponding connecting lines, whereby the switching valve U is opened, the oil acts on the small piston U1 of the valve U by the counteracting force of the valve spring is exceeded. The opening of the switching valve U causes the flow of the oil which is sucked by the smaller diameter step piston 6p of the pump P, and thus the supply of the cylinder 7 of the tool W with oil under high pressure which thus the ejection 7c of the piston 7a at a lower speed greater force acting on the workpiece ( Fig. 2 ).

Nach Beendigung der Bearbeitung am Werkstück, infolge einer eventuellen Beibehaltung des Druckes über eine bestimmte Zeit, je nach den Kaltflusseigenschaften des bearbeiteten Werkstoffes, ist es möglich das Werkzeug durch Rückholen 7r des Kolbens 7a des Werkzeugs W über eine Rückholfeder 7b und Abfluss des Öls aus dem Zylinder 7 erneut zu öffnen indem der Betätigungsmechanismus 6a des Rückflussventils A händisch betätigt 6a wird wodurch der Stößel 2a des Verschlusskörpers 1x des Ventils verschoben 2s wird (Fig.3). Bei Verschlusskörper 1x in Offenstellung dringt c das Öl welches vom Zylinder 7 austritt, unter Wirkung der Feder 7b, in das Ventil 1 a ein um im oberen Bereich bezogen auf den Verschlusskörper 1x des Ventils, auszutreten b. Um den Verschlusskörper 1x des Ventils durch Anwendung einer Kraft 6b betätigen zu können welche kaum höher als die auf den Verschlusskörper 1 x wirkende Federkraft und die Reibung welche auf den kleinen Kolben 2a mit Stößel 4a wirkt, ist, schlägt die Erfindung vor den kleinen Zylinder 3a in welchem der kleine Kolben 2a läuft, mit der Zulauf/Ablauf-Leitung des Zylinders 7 des Werkzeugs zu verbinden c, dabei wird erreicht dass der auf den Verschlusskörper 1x des Ventils 1a wirkende Druck vom Druck annulliert wird welcher im kleinen Zylinder 3a auf den kleinen Kolben 2a wirkt. Der händische Betrieb des Rückflussventils A erfolgt hauptsächlich in Fällen wenn, unter besonderen Umständen oder aus Gründen unvorhergesehener Umstände oder aus Sicherheitsgründen ein sofortiges Öffnen des Werkzeuges erfolgen muss.After completion of the machining on the workpiece, due to a possible maintenance of the pressure over a certain time, depending on the cold flow properties of the machined material, it is possible the tool by retrieving 7r of the piston 7a of the tool W via a return spring 7b and drainage of the oil from the Reopen cylinder 7 by the operating mechanism 6a of the return valve A is operated manually 6a whereby the plunger 2a of the closure body is displaced 1x of the valve 2s ( Figure 3 ). When the closure body 1x in the open position c penetrates the oil which exits the cylinder 7, under the action of the spring 7b, in the valve 1 a in order to emerge in the upper area relative to the closure body 1x of the valve, b. In order to operate the closure body 1x of the valve by applying a force 6b which is barely higher than the force acting on the closure body 1 x spring force and the friction which acts on the small piston 2a with plunger 4a, the invention proposes in front of the small cylinder 3a in which the small piston 2 a runs, to connect with the inlet / outlet line of the cylinder 7 of the tool c, it is achieved that the pressure acting on the closure body 1 x of the valve 1 a pressure is canceled by the pressure in the small cylinder 3 a on the small Piston 2a acts. The manual operation of the return valve A is mainly in cases when, under special circumstances or for reasons of unforeseen circumstances or for safety reasons, an immediate opening of the tool must be made.

Das Öffnen des Rückflussventiles A durch elektronische Steuerung erfolgt durch Betätigung 5r einer Exzenterscheibe 5a welche von einem Elektromotor B (Fig. 4, 5) angetrieben wird, auch in diesem Fall ist, zwecks Verschieben 2s des kleinen Kolbens 2a im Inneren des kleinen Zylinders 3a, eine Kraft erforderlich welche etwas größer ist als der Druck der Feder welche auf den Verschlusskörper 1 x des Ventils 1a wirkt und als die Reibung zwischen dem kleinen Kolben 2a und dem entsprechenden Zylinder 3a beträgt, dies weil der auf den Verschlusskörper 1x des Ventils 1a wirkende Druck vom Druck des Öls ausgeglichen wird welches in den kleinen Zylinder 3a einfließt a. Das erfindungsgemäße Rückflussventil A kann, wegen des obgenannten Druckausgleiches, einen beachtenswerten Querschnitt für den Durchfluss des Öls aufweisen so dass kurze Zeiten für die Öffnung der Werkzeuge W, bzw. hohe Geschwindigkeiten für die Rückholung 7r des Kolbens 7a erreicht werden können, ohne dass hohe Kräfte für die Betätigung des Verschlusskörpers 1x erforderlich sind.The reflux valve A is opened by electronic control by actuation 5r of an eccentric disk 5a which is driven by an electric motor B (FIG. Fig. 4 . 5 ), even in this case, in order to displace 2s of the small piston 2a inside the small cylinder 3a, a force which is slightly larger than the pressure of the spring acting on the closure body 1 x of the valve 1a and the friction is required between the small piston 2a and the corresponding cylinder 3a, this is because the acting on the closure body 1x of the valve 1a pressure is compensated by the pressure of the oil which flows into the small cylinder 3a a. The reflux valve A according to the invention, because of the above-mentioned pressure compensation, have a remarkable cross section for the flow of oil so that short times for the opening of the tools W, or high speeds for the retrieval 7r of the piston 7a can be achieved without high forces 1x are required for the operation of the closure body.

Die Verschiebung 2s des Stößels 4a samt kleinem Kolben 2a und Verschlusskörper 1x des Ventils durch fortschreitende Rotation 5r der Exzenterscheibe 5a, kann stufenweise erfolgen, wodurch eine extrem schnelle Entleerung aber auch eine wahlweise Veränderung der Entleerungsgeschwindigkeiten und somit der Öffnungsgeschwindigkeit der Werkzeuge W ermöglicht wird.
Erfindungsgemäß ermöglicht die stufenweise Öffnung des Rückflussventils, samt der Möglichkeit der kontinuierlichen Veränderung des Durchflussquerschnitts für das Öl, auch eine Veränderung des Drucks, bzw. der Zeiten, während der Phase der Speisung unter Hochdruck sowie auch unter Niederdruck. Durch Abfluss einer Teilmenge des Öls während der Phase der Speisung des Zylinders 7 des Werkzeugs W (Fig. 1, 2) durch das Rückflußventil in Richtung Tank 1, ist es möglich den, während der Arbeitsphase des Werkzeuges und/oder während der folgenden Phase des Kaltflusses des verformten Werkstoffes, wirkenden Hochdruck zu regulieren.The displacement 2s of the plunger 4a together with small piston 2a and closure body 1x of the valve by progressive rotation 5r of the eccentric disk 5a, can be carried out stepwise, whereby an extremely rapid emptying but also an optional change in the emptying speeds and thus the opening speed of the tools W is possible.
According to the invention allows the gradual opening of the reflux valve, including the possibility of continuous change in the flow cross section for the oil, also a change in pressure, or the times during the phase of supply under high pressure and low pressure. By outflow of a subset of the oil during the phase of feeding the cylinder 7 of the tool W ( Fig. 1 . 2 ) through the reflux valve in the direction of the tank 1, it is possible to regulate the high pressure acting during the working phase of the tool and / or during the following phase of the cold flow of the deformed material.

Vorteilhafterweise ist die stufenlose händische Betätigung 6b oder die stufenlose Betätigung durch Rotation 5r der Exzenterscheibe 5a des Stößels 4a samt kleinem Zylinder 2a und Verschlusskörper 1x des Ventils in Öffnungsrichtung 2s erreichbar indem die Halterung der Motoreinheit B samt Exzenterscheibe 5a welche ein Lager 5k trägt, zusammen mit den, in eine Halterung 2h eingebauten Lagern 2k, parallel zur Achse des besagten Stößels 4a parallel zur Achse des besagten Stößels 4a verschiebbar ist. Das besagte Halterungselement 2h ist verschiebbar außen an einem Rohrelement 2m des, auf dem Körper der Pumpe P montierten Ventils A geführt und von den Köpfen der, vom Körper der Pumpe P parallel abragenden Bolzen 1g, in einer Position maximaler axialer Entfernung vom Verschlusskörper 1x des Ventils welche durch den Druck von, außen an den besagten Bolzen 1g angebrachten, zylindrischen Druckfedern 1f bestimmt wird, zurückgehalten. Im Falle händischer Betätigung 6b, z.B. mittels Druckknopf oder Hebel 6a, erfolgt die axiale Verschiebung des Halterungselementes 2h zusammen mit dem Motor B samt Exzenterscheibe 5a indem die Federn 1f komprimiert werden, dadurch erfolgt die Verschiebung 2s des Stößels 4a samt Verschlusskörper 1x des Ventils was die Öffnung des selben bewirkt. Im Falle einer Öffnung mittels Motor B durch Rotation 5r der Exzenterscheibe 5a, wird das Verschieben 2s des Stößels 4a samt Verschlusskörper 1 x des Ventils erreicht, ohne dass die Halterung 2h verschoben und die Federn 1f komprimiert werden. In diesem letzten Fall ist es möglich eine präzise Veränderung des freien Durchflussquerschnittes und die Beibehaltung eines bestimmten Durchflussquerschnittes zu erreichen.Advantageously, the stepless manual operation 6b or the continuous operation by rotation 5r of the eccentric 5a of the plunger 4a together with a small cylinder 2a and closure body 1x of the valve in the opening direction 2s achievable by the holder of the motor unit B together with eccentric 5a which carries a bearing 5k, together with mounted in a holder 2h bearings 2k, parallel to the axis of said plunger 4a parallel to the axis of said plunger 4a is displaceable. The said support member 2h is displaceably guided on the outside of a pipe member 2m of the valve A mounted on the body of the pump P and the heads of the bolt 1g projecting in parallel from the body of the pump P in a position of maximum axial distance from the shutter body 1x of the valve which is determined by the pressure of, on the outside of said pin 1 g attached, cylindrical compression springs 1 f, retained. In the case of manual actuation 6b, for example by means of push button or lever 6a, the axial displacement of the support member 2h takes place together with the motor B together with the eccentric disc 5a by compressing the springs 1f, this results in the displacement of the plunger 2s 4a together Lock body 1x of the valve causing the opening of the same. In the case of an opening by means of motor B by rotation 5r of the eccentric disk 5a, the displacement 2s of the plunger 4a together with the closure body 1 x of the valve is achieved without the holder 2h being displaced and the springs 1f being compressed. In this last case, it is possible to achieve a precise change of the free flow cross section and the maintenance of a certain flow cross section.

Die Erfindung schließt eine feststehende Halterung des Motors B samt Exzenterscheibe, ohne gleitendem Halterungselement 2h und Federn 1f und die händische Betätigung 2s des Stößels 4a oder des kleinen Kolbens 2a nicht aus.The invention does not exclude a fixed mounting of the motor B including eccentric disc, without sliding support member 2h and springs 1f and the manual operation 2s of the plunger 4a or the small piston 2a.

Claims (4)

  1. Portable hydraulic pump assembly for operating tools (W), which portable hydraulic pump assembly comprises a pump with a stopped piston (3p, 6p) for the delivery of oil at two different pressures and at two different flow rates, a tank (1), a chargeable battery, suction valves (V1, V2) and outlet valves (V3) for providing a feed to a hydraulic cylinder (7) of tools (W) connected to the pump assembly, a switchover valve (U) for switching from operation at low pressure to operation at high pressure and vice versa, an automatic or controlled return flow valve (A) for the return flow of oil from the tool cylinder (7) into the tank (1), a tared safety valve (S), pressure and/or throughflow sensors, and an electronic device for controlling, monitoring and displaying the operating functions, characterized in that the return flow valve (A), which is provided between the connecting line for providing a feed to the cylinder (7) of the tool (W) and the tank (1), has a valve body (1a) which comprises a closure body (1x) which is connected coaxially to a small piston (2a) provided with a plunger (4a), wherein the end (4e) of the plunger is acted on by an eccentric disc (5a) which is operated by a motor (B), in that the small piston (2a) seals with a cylinder (3a) arranged coaxially with respect to the valve body (1a), in that the cylinder (3a) is hydraulically connected to the line for providing a feed to the cylinder (7) of the tool (W), and in that, in relation to the angle of rotation (5r) of the eccentric disc (5a), the plunger (4a) together with closure body (1x) is displaced (2s) axially, as a result of which the continuous variation of the throughflow cross section for the oil passing from the cylinder (7) is realized, which oil enters (c) into the return flow valve (A) and emerges (b) from said return flow valve in order to reach the Lank (1).
  2. Pump assembly according to Claim 1, characterized in Lhat, during the feeding of oil at low pressure to the cylinder (7) of the tool (W) and/or during the feeding of oil at high pressure, the return flow valve (A) functions, as required, as a pressure regulating valve by virtue of a regulable partial quantity of oil being discharged from the supply line of the cylinder (7) into the tank (1).
  3. Pump assembly according to Claim 1, characterized in that the motor (B) together with the eccentric disc (5a) is mounted so as to be displaceable along the axis of the return flow valve (A) by means of an element (2h) which is retained by the heads of two bolts which project (1g) parallel to one another from the body of the hydraulic pump (P), wherein said element is pressed against said heads by cylindrical pressure springs (1f), and in that the return flow valve can be opened, for the throughflow of oil, by direct or indirect actuation (6b) of the bearing element (2h) by means of a lever or pushbutton (6a) and through compression of the springs (If).
  4. Pump assembly according to Claims 1 and 2, characterized in that the return flow valve (A) is actuated by the manual exertion of force on the plunger (4a) or on the piston (2a), without the bearing element (2h) for the motor (B) together with the eccentric disc (5a) being displaced in the process, said bearing element in this case being constructed in a positionally fixed manner on the valve body or on the housing of the pump (P).
EP10014964A 2009-12-02 2010-11-25 Portable hydraulic pump group for operating tools Active EP2333335B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBZ2009A000052A IT1397324B1 (en) 2009-12-02 2009-12-02 PORTABLE HYDRAULIC PUMP ASSEMBLY FOR DRIVING TOOLS.

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EP2333335A1 EP2333335A1 (en) 2011-06-15
EP2333335B1 true EP2333335B1 (en) 2012-10-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252361A1 (en) 2016-06-03 2017-12-06 Intercable GmbH Return assembly with a floating return valve and electromagnetic control

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3053705B1 (en) * 2013-09-30 2019-02-06 Izumi Products Company Power unit and electric tool
DE102017200212B4 (en) * 2017-01-09 2021-12-16 Hawe Hydraulik Se Two-stage pump with switching valve
DE102017012400B3 (en) 2017-01-09 2022-06-09 Hawe Hydraulik Se Two-stage pump with changeover valve
CN113027870B (en) * 2021-03-17 2022-10-18 四川百纳科技有限责任公司 Independent heat dissipation system of all-terrain armored vehicle and control method thereof

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE19801188B4 (en) * 1998-01-15 2007-08-30 Intercable S.R.L., Brunico Foot pump for operating hydraulic tools, cylinders o. The like.
DE10249524B4 (en) * 2002-10-23 2005-12-29 Minibooster Hydraulics A/S Fluid supply unit, in particular hydraulic supply unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252361A1 (en) 2016-06-03 2017-12-06 Intercable GmbH Return assembly with a floating return valve and electromagnetic control
DE102016110324A1 (en) 2016-06-03 2017-12-07 Intercable Gmbh Return assembly with a floating return valve and electro-magnetic control

Also Published As

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EP2333335A1 (en) 2011-06-15
IT1397324B1 (en) 2013-01-10

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