EP1797336B2 - Ejecteur - Google Patents

Ejecteur Download PDF

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Publication number
EP1797336B2
EP1797336B2 EP05774326.2A EP05774326A EP1797336B2 EP 1797336 B2 EP1797336 B2 EP 1797336B2 EP 05774326 A EP05774326 A EP 05774326A EP 1797336 B2 EP1797336 B2 EP 1797336B2
Authority
EP
European Patent Office
Prior art keywords
negative pressure
ejector
valve
energy
voltage
Prior art date
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Active
Application number
EP05774326.2A
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German (de)
English (en)
Other versions
EP1797336B1 (fr
EP1797336A1 (fr
Inventor
Kurt Schmalz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
J Schmalz GmbH
Original Assignee
J Schmalz GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority claimed from DE200410050042 external-priority patent/DE102004050042B3/de
Application filed by J Schmalz GmbH filed Critical J Schmalz GmbH
Publication of EP1797336A1 publication Critical patent/EP1797336A1/fr
Publication of EP1797336B1 publication Critical patent/EP1797336B1/fr
Application granted granted Critical
Publication of EP1797336B2 publication Critical patent/EP1797336B2/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • F04F5/52—Control of evacuating pumps

Definitions

  • the invention relates to an ejector for generating a negative pressure, having the features of the preamble of claim 1.
  • Ejectors are typically used to create a negative pressure by means of compressed air on site, whereby vacuum lines can be saved. These ejectors need only be supplied with compressed air and electrical energy.
  • the ejectors are usually controlled by a machine control, which specifies the time of the suction start or the suction end and possibly a blow-off. After an object has been grasped with a gripper unit, those ejectors which are required for the vacuum supply of the suction grippers resting on the workpiece are controlled via the machine program, so that a negative pressure is generated in these suction grippers.
  • Intelligent ejectors have a negative pressure sensor which determines whether and when the required negative pressure is reached or has been achieved.
  • the ejector automatically disables the vacuum generation, although it still receives the instruction to generate negative pressure via the machine program. This saves energy, since only compressed air is consumed when actually negative pressure is generated. If the suction pad sits on an object and sucks it, then with an intact seal almost no negative pressure is consumed and the ejector can be switched off. Only with defective seals, possibly on uneven surfaces or porous workpieces, the negative pressure can only be maintained if permanent or in time intervals negative pressure is generated. In this case the ejector does not switch off the vacuum generation or again and again.
  • ejectors are equipped with bistable solenoid valves which maintain their instantaneous position in the event of a voltage drop. This ensures that the aspirated and possibly lifted object from the suction pad does not fall off, since the bistable check valve maintains its position. If the valve is open, negative pressure is generated in the ejector and the negative pressure is applied to the object even if there is a voltage drop. When the shut-off valve is closed, it will remain closed, even if the voltage drops.
  • the invention has for its object to provide an ejector, in which it is ensured even at a voltage drop that the negative pressure is maintained.
  • This energy storage has the task to provide the energy that is required to operate the control and / or the check valve in the event of a voltage drop. In this way, the signal provided by the vacuum sensor can be processed in the controller and the check valve can be opened.
  • the stored energy in the energy storage only has to be so large that it supplies the vacuum sensor and the controller until it is ensured that the check valve is open. When the shut-off valve is open, negative pressure is generated and this ensures that the sucked object remains attached to the suction pad even in the event of leakage.
  • the energy store is arranged in the ejector. This has the significant advantage that e.g. even then the check valve can still be changed when the electrical supply to the ejector is disconnected.
  • the energy store is a capacitor.
  • Capacitors are mass-produced relatively inexpensive and can store relatively much energy, the space required by a capacitor is relatively low.
  • a capacitor as an electrical energy storage has the significant advantage that it can be relatively easily charged, in contrast to hydraulic, pneumatic or mechanical energy storage (springs or the like), which usually require mechanical energy for clamping.
  • batteries, accumulators, solenoids and the like can be used.
  • the check valve is designed as a bistable solenoid valve solenoid valves can be electrically controlled and require relatively little energy for their conversion. If the energy required to change the solenoid valve is also stored in the energy store, this only slightly increases its dimensions.
  • the energy store opens the shut-off valve via the controller, thereby ensuring that sufficient negative pressure is present on the suction pad via the ejector, so that the object is held securely with certainty. This can be done immediately or only when the vacuum drops below a threshold, which is monitored by means of a vacuum sensor, which is also powered by the energy storage.
  • a voltage monitor detecting a voltage drop is provided.
  • This voltage monitor gives e.g. a signal when the voltage drops below a threshold, so that the vacuum sensor, the controller and the solenoid valve are powered by the energy storage. Once the voltage returns to normal, the energy storage is recharged.
  • the voltage monitor according to the invention is connected to the controller and arranged in particular in the ejector.
  • the controller is integrated in the ejector. In this way, even with a rupture of the electrical supply line, the controller can be easily supplied with voltage, so that the check valve, for example. Not only open but the function of the check valve can still be controlled by this is opened at negative pressure drop and closed again when the desired negative pressure.
  • an ejector 10 is shown schematically, which has a housing 12 to which a muffler 14 is flanged.
  • a control box 16 in which machanische and electronic components are housed and which is provided with two connection terminals 18, to which electrical connection lines can be connected.
  • a solenoid valve 20 In the control box 16 is a solenoid valve 20 with a solenoid 22 which is bistable, i. which maintains its two end positions even when de-energized.
  • the solenoid valve 20 serves as a check valve for a compressed air channel 28 in order to separate it from a suction air channel 26 and an exhaust air channel 30.
  • a negative pressure sensor 32 Connected to the suction air channel 26 is a negative pressure sensor 32, which operates in an analog manner.
  • This negative pressure sensor 32 detects the negative pressure prevailing in the suction air channel 26, which can be e.g. through Lekkagen can change. These leaks may e.g. caused by worn seals on a suction pad 34 or by a porous object to be sucked 36.
  • a controller 38 to which the vacuum sensor 32 is connected, and an energy storage 40th
  • This energy store 40 is formed by a storage capacitor 42, which is usually charged. During a voltage drop or power failure, which is detected by a voltage monitor 44, the solenoid coil 22, the vacuum sensor 32 and the controller 38 are supplied by the storage capacitor 42 with voltage, so as to ensure that the control loop is functional and can be ensured that in Suction air duct 26 Negative pressure prevails.
  • the solenoid valve 20 bypassing the vacuum sensor 32, the solenoid valve 20 immediately, that is immediately opened at voltage drop, so that the suction air 26 is supplied with negative pressure, or the compressed air channel 28 is only opened when the vacuum sensor 32 indicates that the negative pressure in the suction air channel 26th falls below a threshold.
  • the Magnetventll 20 can be switched back to its closed position and close the compressed air channel 28.
  • the ejector 10 is at least temporarily independent of an external power supply and it is ensured that the negative pressure in the suction air channel 26 does not collapse and the article 36 does not fall off the suction pad 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Manipulator (AREA)

Claims (1)

  1. Ejecteur (10) permettant de générer une pression négative, possédant une conduite de vide (26), une conduite sous pression (28), un capteur de vide (32) raccordé à la conduite de vide (26), une soupape qui obture la conduite sous pression (28), une unité de commande (38) qui commande la soupape et une alimentation en énergie extérieure pour l'unité de commande,
    caractérisé en ce que la soupape est un clapet d'arrêt bistable, et en ce que l'unité de commande (38) et la soupape sont munis d'un dispositif de stockage d'énergie (40) qui les alimente en énergie électrique, et dans lequel un relais à seuil de tension (44) est fourni, qui détecte une chute de tension, dans lequel, dans le cas d'une chute de tension, l'unité de stockage d'énergie (40) ouvre le clapet d'arrêt par l'intermédiaire de l'unité de commande (38).
EP05774326.2A 2004-10-08 2005-08-10 Ejecteur Active EP1797336B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200410050042 DE102004050042B3 (de) 2004-10-08 2004-10-08 Ejektor
DE200520001880 DE202005001880U1 (de) 2004-10-08 2005-02-01 Ejektor
PCT/EP2005/008672 WO2006039959A1 (fr) 2004-10-08 2005-08-10 Ejecteur

Publications (3)

Publication Number Publication Date
EP1797336A1 EP1797336A1 (fr) 2007-06-20
EP1797336B1 EP1797336B1 (fr) 2008-09-24
EP1797336B2 true EP1797336B2 (fr) 2017-06-21

Family

ID=35107050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05774326.2A Active EP1797336B2 (fr) 2004-10-08 2005-08-10 Ejecteur

Country Status (2)

Country Link
EP (1) EP1797336B2 (fr)
WO (1) WO2006039959A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531940C2 (sv) * 2007-01-10 2009-09-15 Xerex Ab Ejektoranordning
EP3255283B1 (fr) * 2016-06-10 2019-01-23 Piab Ab Dispositif éjecteur pour des ventouses
KR102225162B1 (ko) * 2020-06-19 2021-03-09 (주)브이텍 진공 시스템용 에어-밸브 유닛

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07327375A (ja) † 1994-05-31 1995-12-12 Ebara Corp 真空ポンプにおける瞬停・瞬時電圧低下補償装置
US5795001A (en) † 1996-12-18 1998-08-18 Burke; Stephen H. Vacuum device for handling articles
JP2004084547A (ja) † 2002-08-27 2004-03-18 Boc Edwards Technologies Ltd 真空ポンプ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9013528U1 (fr) * 1990-09-26 1991-04-11 Bartholomy & Co, 516O Dueren, De
US6527518B2 (en) * 2000-09-21 2003-03-04 Michael H. Ostrowski Water-powered sump pump
US6397885B1 (en) * 2001-02-06 2002-06-04 Norgren Automotive, Inc. Vacuum control apparatus for maintaining the operating condition of a vacuum responsive device during loss and resumption of power
DE10118885C1 (de) * 2001-04-18 2002-11-07 Schmalz J Gmbh Vakuumerzeuger
US6786228B2 (en) * 2001-12-20 2004-09-07 Parker-Hannifin Corporation Air circuit with air economizing and memory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07327375A (ja) † 1994-05-31 1995-12-12 Ebara Corp 真空ポンプにおける瞬停・瞬時電圧低下補償装置
US5795001A (en) † 1996-12-18 1998-08-18 Burke; Stephen H. Vacuum device for handling articles
JP2004084547A (ja) † 2002-08-27 2004-03-18 Boc Edwards Technologies Ltd 真空ポンプ

Also Published As

Publication number Publication date
WO2006039959A1 (fr) 2006-04-20
EP1797336B1 (fr) 2008-09-24
EP1797336A1 (fr) 2007-06-20

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