EP2333335B1 - Groupe de pompes hydrauliques portatif pour le fonctionnement d'outils - Google Patents

Groupe de pompes hydrauliques portatif pour le fonctionnement d'outils 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
European Patent Office
Prior art keywords
valve
cylinder
oil
return flow
tool
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Application number
EP10014964A
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German (de)
English (en)
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EP2333335A1 (fr
Inventor
Arnold Reichegger
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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)

Claims (4)

  1. Groupe de pompes hydrauliques portable pour le fonctionnement d'outils (W), comprenant une pompe munie d'un piston à gradin (3p, 6p) pour le transport de l'huile avec deux valeurs de pression différentes et deux volumes de transport différents, un réservoir (1), une batterie rechargeable, des soupapes d'aspiration (V1, V2) et des soupapes d'échappement (V3) pour l'alimentation d'un cylindre hydraulique (7) d'outils (W) raccordés au groupe de pompes, une soupape de commutation (U) pour passer d'un mode sous basse pression à un mode sous haute pression et inversement, une soupape de reflux (A) autonome ou commandée pour le reflux de l'huile provenant du cylindre d'outils (7) dans le réservoir (1), une soupape de sécurité tarée (S), des sondes de pression et/ou de débit et un dispositif électronique pour la commande, la surveillance et l'affichage des fonctions de service, caractérisé en ce que la soupape de reflux (A) prévue entre la conduite de raccordement menant à l'alimentation du cylindre (7) de l'outil (W) et du réservoir (1) présente un corps de soupape (1a) qui comporte un corps de fermeture (1x) relié coaxialement à un petit piston (2a) doté d'un poussoir (4a), où agit à l'extrémité (4e) du poussoir un disque excentré (5a) entrainé par un moteur (B), en ce que le petit piston (2a) est comprimé avec un cylindre (3a) disposé coaxialement au corps de soupape (1a), en ce que le cylindre (3a) est relié hydrauliquement avec la conduite pour l'alimentation du cylindre (7) de l'outil (W) et en ce que le poussoir (4a), conjointement avec le corps de fermeture (1x), est décalé (2s) axialement par rapport à l'angle de rotation (5r) du disque excentré (5a), moyennant quoi la modification non progressive de la section de débit pour l'huile qui vient du cylindre (7) s'effectue, laquelle pénètre (c) dans la soupape de reflux (A) et sort (b) de nouveau de celle-ci pour atteindre le réservoir (1).
  2. Groupe de pompes selon la revendication 1, caractérisé en ce que la soupape de reflux (A) fonctionne, si besoin est, en tant que soupape de régulation de la pression lors de l'alimentation du cylindre (7) de l'outil (W) avec de l'huile sous basse pression et/ou lors de l'alimentation avec de l'huile sous haute pression en déviant une quantité partielle d'huile pouvant être régulée depuis la conduite d'alimentation du cylindre (7) jusque dans le réservoir (1).
  3. Groupe de pompes selon la revendication 1, caractérisé en ce que le moteur (B) est supporté de manière à pouvoir coulisser conjointement avec le disque excentré (5a) en fonction de l'axe de la soupape de reflux (A) au moyen d'un élément (2h) qui est retenu par les têtes de deux boulons saillant (1g) du corps de la pompe hydraulique (P) parallèlement l'une à l'autre, cet élément étant comprimé contre lesdites têtes grâce à des ressorts de pression (1f) cylindriques et en ce que la soupape de reflux peut être ouverte grâce à l'actionnement direct ou indirect (6b) de l'élément support (2h) au moyen d'un levier ou d'un bouton à presser (6a) par compression des ressorts (1f), pour le débit de l'huile.
  4. Groupe de pompes selon la revendication 1 et 2, caractérisé en ce que la soupape de reflux (A) est actionnée par action manuelle sur le poussoir (4a) ou le piston (2a) sans que le coulissage de l'élément support (2h) pour le moteur (B), conjointement avec le disque excentré (5a), ne s'effectue, lequel élément est dans ce cas monté de manière à être fixe sur le corps de la soupape ou sur le boîtier de la pompe (P).
EP10014964A 2009-12-02 2010-11-25 Groupe de pompes hydrauliques portatif pour le fonctionnement d'outils Active EP2333335B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBZ2009A000052A IT1397324B1 (it) 2009-12-02 2009-12-02 Gruppo pompa idraulica portatile per l'azionamento di attrezzi.

Publications (2)

Publication Number Publication Date
EP2333335A1 EP2333335A1 (fr) 2011-06-15
EP2333335B1 true EP2333335B1 (fr) 2012-10-31

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IT (1) IT1397324B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252361A1 (fr) 2016-06-03 2017-12-06 Intercable GmbH Module retour comprenant un clapet anti-retour à flotteur et commande électromagnétique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6040319B2 (ja) * 2013-09-30 2016-12-07 株式会社泉精器製作所 パワーユニットおよび電動工具
DE102017012400B3 (de) 2017-01-09 2022-06-09 Hawe Hydraulik Se Zweistufenpumpe mit Umschaltventil
DE102017200212B4 (de) * 2017-01-09 2021-12-16 Hawe Hydraulik Se Zweistufenpumpe mit Umschaltventil
CN113027870B (zh) * 2021-03-17 2022-10-18 四川百纳科技有限责任公司 一种全地形装甲车独立散热系统及其控制方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801188B4 (de) * 1998-01-15 2007-08-30 Intercable S.R.L., Brunico Fußpumpe zum Betrieb hydraulischer Werkzeuge, Zylinder o. dgl.
DE10249524B4 (de) * 2002-10-23 2005-12-29 Minibooster Hydraulics A/S Fluid-Versorgungseinheit, insbesondere hydraulische Versorgungseinheit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252361A1 (fr) 2016-06-03 2017-12-06 Intercable GmbH Module retour comprenant un clapet anti-retour à flotteur et commande électromagnétique
DE102016110324A1 (de) 2016-06-03 2017-12-07 Intercable Gmbh Rücklaufbaugruppe mit einem schwimmenden Rücklaufventil und elektro-magnetischer Ansteuerung

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Publication number Publication date
IT1397324B1 (it) 2013-01-10
EP2333335A1 (fr) 2011-06-15
ITBZ20090052A1 (it) 2011-06-03

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