EP0450518A1 - Vérin à air comprimé - Google Patents

Vérin à air comprimé Download PDF

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Publication number
EP0450518A1
EP0450518A1 EP91105013A EP91105013A EP0450518A1 EP 0450518 A1 EP0450518 A1 EP 0450518A1 EP 91105013 A EP91105013 A EP 91105013A EP 91105013 A EP91105013 A EP 91105013A EP 0450518 A1 EP0450518 A1 EP 0450518A1
Authority
EP
European Patent Office
Prior art keywords
valve
cylinder
cover
cylinder cover
inlet opening
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.)
Ceased
Application number
EP91105013A
Other languages
German (de)
English (en)
Inventor
Wolfgang Nüssler
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.)
Knorr Bremse AG
Original Assignee
Knorr Bremse AG
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
Application filed by Knorr Bremse AG filed Critical Knorr Bremse AG
Publication of EP0450518A1 publication Critical patent/EP0450518A1/fr
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type

Definitions

  • the invention relates to an actuating cylinder which can be pressurized with compressed air, in particular a rodless slot cylinder, with a cylinder body which is closed off at least at one end by a pressure-tightly attached cylinder cover, the cylinder cover delimiting an actuating space in the cylinder body and projecting with a throttle tube extension into the actuating space and an inlet opening for a compressed air supply and on one of its outer surfaces has an outlet opening to the atmosphere, which can be connected alternately to the pressurization chamber via a piston-operated shuttle valve integrated in the cylinder cover and through the throttle tube extension, the outlet opening being connected upstream of a throttle point adjustable by a first throttle screw, the axial directions of the cylinder body and the Change valve cross each other at least approximately at right angles and one of the actuating pistons for the change valve comes into contact
  • the control chamber is located in a control cover, which is flanged by means of a flange surface on the outer surface of the cylinder cover opposite the inlet opening and penetrated by
  • a commercially available actuating cylinder of this type which is designed as a slit cylinder, suffers from the defect that, in the event of a pressure drop at the inlet opening, the pressurizing chamber is also vented; If this pressure chamber was previously pressurized with air, this can result in an unwanted and possibly dangerous adjustment of the actuating cylinder.
  • a separate check valve must be arranged in the connecting line from a compressed air source to the inlet opening, but this increases the construction effort.
  • dismantling the pressure retained in the actuating cylinder or its cylinder cover by the check valve despite disconnecting the compressed air source can endanger the dismantling personnel.
  • the cylinder cover of the known actuating cylinder is also relatively expensive, since it is provided with complicated air duct guides and slide valve arrangements in its interior.
  • the control cover can only be flange-mounted on the cylinder cover in such a way that the pilot valve extends next to the cylinder body and hinders the attachment of any switches that are required, depending on the piston stroke position.
  • actuating cylinder of the type mentioned in the introduction such that no sudden, unforeseen and risk-causing piston movement can occur without additional devices when the pressure drops at the inlet opening, but that a safe disassembly of the actuating cylinder is possible.
  • the actuating cylinder to be created should be compact, simple and inexpensive to design, in particular offer the option of arranging air guide channels in a simple and inexpensive manner in such a way that the control cover can be flanged to the cylinder cover in different rotational positions, such that the pilot valve can be swung out of its parallel position next to the cylinder body and the arrangement of stroke-dependent switches is possible without hindrance from the pilot valve.
  • the actuating cylinder has a cylinder body 1, in which a piston (not shown) is movable, which delimits an admission space 2 located in the cylinder body 1.
  • the cylinder cover 3 has an annular shoulder 4, with which it engages in the cylinder body 1 in a sealed manner by a sealing ring 5.
  • the cylinder cover 3 Coaxial to the axis of the cylinder body 1, the cylinder cover 3 carries a throttle tube extension 6 projecting beyond the ring extension 4 and having an interior space 7 which opens away into the pressurizing chamber 2 facing away from the cylinder cover.
  • the pressurizing chamber 2 forms an annular space 8. If the piston approaches the cylinder cover 3 by pressurizing the compressed air from the other side with at least approximately ventilated pressurizing chamber 2, it moves onto the throttle pipe hub 6 shortly before reaching its end position and separates the interior 7 from the annular space 8 on the loading space side; Since one of these spaces can only be vented in a throttled manner by means of a throttle device in the cylinder cover 3 to be described later, this results in end position damping for the movement of the piston.
  • the cylinder cover 3 is held in the position shown on the cylinder body 1 by screw connections or other brackets (not shown). In this respect, the actuating cylinder corresponds to the usual state of the art.
  • An inlet opening 10 of a bore 11 running perpendicular to the outer surface 9 opens into a lateral outer surface 9 of the cylinder cover 3; the inlet opening 10 is to be connected to a compressed air source via a line connection, not shown, so it serves to supply compressed air to the actuating cylinder.
  • an essentially L-shaped air duct 12 branches off from the bore 11, one leg of which extends essentially laterally offset parallel to the bore 11 and on the outer surface 13 of the cylinder cover 3 opposite the outer surface 9 into an annular space to be described later 14 opens.
  • valve cage 16 Following the branching of the air duct 12, the bore 11 is widened in stages, on the inner shoulder 26 thus formed there is a flange 15 of a valve cage 16 which extends further away from the inlet opening 10.
  • the Valve cage 16 has an inner valve seat 17 in the region of its flange 15, against which a valve ball 19 is pressed by means of a spring 18 supported on the other hand against the valve cage 16.
  • the inner valve seat 17 forms, together with the valve ball 19, a check valve 17, 19 opening in the flow direction away from the inlet opening 10.
  • a cylindrical body section of the valve cage 16 facing away from the inner valve seat 17 has a plurality of openings and is surrounded by a cylinder extension 21, which is sealed and displaceably mounted in the enlarged section of the bore 11 by means of a sealing ring 20 and which is part of a double valve sealing ring 22.
  • the double valve sealing ring 22 has on its side facing away from the inlet opening 10 two radially offset valve sealing ring surfaces, the outer of which cooperates with a valve seat 23 fixed to the cylinder cover and the inner of which cooperates with a movable valve seat 24.
  • a spring 25 is sung, which on the one hand presses the flange 15 against the inner shoulder 26 of the bore 11 and thus holds the valve cage 16 and which on the other hand closes the double valve sealing ring 22 in the direction of displacement the valve seats 23 and 24 loaded.
  • an air duct 27 opens into the bore 11, which extends in the direction of the outer surface 28 of the cylinder cover 3 facing away from the cylinder body 1; the flow cross section of the air duct 27 is adjustable by a throttle point with a throttle screw 29 which is adjustably screwed to the cylinder cover 3 and which projects with a conical throttle tip 30 into a section of the air duct 27 running parallel to the bore 11.
  • the air duct 27 opens, protected by an air filter, with an outlet opening 31 in the outer surface 28.
  • the throttle screw 29 is adjustable from the outer surface 9.
  • a tubular insert body 34 is held sealed by means of two sealing rings 32 and 33.
  • the insert body 34 carries at its end facing the double valve sealing ring 22 the valve cover 23 fixed to the cylinder cover, in the region of the outer surface 13 it is provided with a radially outer flange 35, by means of which it projects into an annular groove surrounding the mouth of the bore 11 in the outer surface 13 and through one is clamped to the outer surface 13 flanged control cover 36 in a manner to be described later.
  • the insert body 34 has radial openings 37; in this area it is surrounded by an annular groove into which an air duct 38 running in the cylinder cover 3 opens, which on the other hand is connected to the interior 7 of the throttle tube extension 6.
  • the radially inner valve seat 24 is movable, it is located at the closed end of a plunger 39 which is movable within the insert body 34.
  • the tappet 39 In the area from the valve seat 24 to beyond the openings 37, the tappet 39 has radial play within the insert body 34, for example in the area of the flange 35, the tappet 39 is guided in the insert body 34 in a sealed manner by means of a sealing ring 40.
  • the tappet 39 is coupled to an actuating piston 41, which, in the control cover 36, is displaceably mounted in a sealing manner in the engaging end of the insert body 34, sealed by means of a sealing ring 42.
  • the space 43 located in the control cover 36 between the actuating piston 41 and the end of the insert body 34 is vented into the atmosphere by means of a vent hole 44.
  • the double valve sealing ring 22 with the valve seats 23 and 24 forms a shuttle valve 22, 23, 24 designed as a double seat lifting valve, which alternately acts on the pressurizing chamber 2 through the interior 7 and the air duct 38 either with the inlet opening 10 or through the Air duct 27 connects to the atmosphere; the shuttle valve is mediated of the actuating piston 41 switchable.
  • the axial directions of the cylinder body 1 and the shuttle valve 22, 23, 24 cross or intersect at least approximately at right angles, the axis direction of the shuttle valve 22, 23, 24 penetrating the outer surface 13.
  • the annular space 14 is sealed in the axial direction of the bore 11 by means of the sealing rings 33 and 42 and radially outwards by a sealing ring 45 clamped between the outer surface 13 of the cylinder cover 3 and the flange surface of the control cover 36 resting thereon.
  • a sealing ring 45 clamped between the outer surface 13 of the cylinder cover 3 and the flange surface of the control cover 36 resting thereon.
  • the control cover 36 there is an air duct 46 which, on the one hand, opens into the annular space 14, then runs at an angle and, on the other hand, ends in a side surface 47 of the control cover 36, which adjoins the flange surface of the control cover 36 facing the outer surface 13; In the illustrated embodiment, this side surface 47 faces the direction of extent of the cylinder body 1.
  • a conventional pilot valve 48 is flanged to the side surface 47, which can preferably be designed as a solenoid valve, but which can also be pneumatically switched or operated manually by means of a remote control.
  • the pilot valve 48 there is an air duct 49, which can be connected to the atmosphere by means of a valve 50 with a continuation 51 of the air duct 46 located in the pilot valve 48 or, via a valve (not shown) of the pilot valve 48, with the continuation 51 shut off.
  • the air duct 49 like the air duct 46, seals the side surface 47 and opens into a control chamber 52 within the control cover 36, which is delimited in the direction of the cylinder cover 3 by the actuating piston 41 and thus acts on it.
  • the control cover 36 is flanged to the cylinder cover 3 in a manner not shown by means of screws arranged in the same angular pitch on a pitch circle, for example four can be arranged at the corners of a square Screws may be provided.
  • This flange arrangement in connection with the annular space 14 and the pneumatic connection of the air duct 12 with the air duct 46 mediated thereby provides the possibility of flanging the control cover 36 to the cylinder cover 3 in different rotational positions around the longitudinal direction of the bore 11, the different rotational positions are determined by the angular pitch of the flange screws.
  • control cover 36 can be flanged to the cylinder cover 3 rotated by the angular division, as a result of which the pilot valve 48 comes into a position which enables access to the outer surface of the cylinder body 1, it can run at right angles or at a different angle to the plane of the drawing or can also be located in the plane of the drawing to the right of the control cover 36 and thus protrude beyond the outer surface 28.
  • a connecting channel 53 which runs from the interior 7 of the throttle tube extension 6 to the annular space 8, that is, bridges the wall of the throttle tube extension 6.
  • the flow cross-section of this connecting channel 53 is adjustable by means of the conical throttle tip 54 of a second throttle screw 55, which is screwed to the cylinder cover 3 so as to be adjustably screwed so that it is accessible from its outer surface 9.
  • the connecting channel 53 belongs together with the throttle screw 55 and the throttle tube extension 6 to the so-called. End position damping for the piston of the actuating cylinder, as is common.
  • Vent channel 56 connected, which runs in a plane offset from the sectional plane of the drawing, only shown in a section.
  • the venting duct 56 opens at a right angle into the outer surface 9 by means of a threaded bore 57.
  • a tubular extension 58 having an external thread and a locking screw 59 arranged parallel to the throttle screw 55 is screwed into the threaded bore 57.
  • the tube extension 58 has radial openings 61.
  • a sealing ring 62 surrounding the tube extension 58 is clamped between the head 60 and the outer surface 9.
  • the inlet opening 10 is supplied with compressed air which, when the check valve 17, 19 is opened, at least enters the interior of the double valve sealing ring 22 up to the end face of the tappet 39. Furthermore, this compressed air passes through the air duct 12, the annular space 14 and the air duct 46 to the pilot valve 48, where it is either shut off or reaches the air duct 49 and thus into the control chamber 52.
  • the shuttle valve 22, 23, 24 connects the pressurizing chamber 2 through the air duct 27 with the atmosphere, so that the piston of the actuating cylinder can move in the direction of the cylinder cover 3.
  • the shuttle valve 22, 23 , 24 keeps his Switch position shown, since the control chamber 52 remains in any case vented via the air guide channel 12 which is unpressurized with the inlet opening 10; it can therefore not cause unwanted ventilation of the pressurized space 2 through the air duct 27.
  • the actuating cylinder thus maintains its switch position despite the loss of compressed air at its inlet opening 10; there is no unforeseen, possibly dangerous, lifting movement on the actuating cylinder.
  • the inlet opening 10 is in any case depressurized by dismantling its connection to the compressed air source, so that the above-mentioned conditions also result.
  • the locking screw 59 must be loosened beforehand, as a result of which the compressed air from the pressurization chamber 2 and the rooms connected to it through the connecting duct 53 and the ventilation duct 56 and the pipe extension 58 on the sealing ring which has no sealing effect 62 can escape to the atmosphere.
  • the pressure chamber 2 is thus depressurized, the disassembly of the actuating cylinder or its cylinder cover 3 can be done safely.
  • make sure that the screw plug 59 is tightened again so that the sealing ring 62 can again fulfill its sealing function and block the venting of the pressurization chamber 2 through the venting channel 56.
  • the check valve 17, 19 in particular can also be designed differently, for example with a flat, movable valve plate instead of the valve ball 19.
  • the accessibility of the throttle screws 29 and 55 and locking screw 59 from the same outer surface 9 can be advantageous, but these components can also be arranged accessible from different sides: It is clearly evident that the positions of the outlet opening 31 and throttle screw 29 are easily interchangeable are, the locking screw 59 could be rotated by 90 ° at right angles to the plane of the drawing or arranged in parallel accessible from the side of the cylinder body 1.
  • the actuating cylinder which is preferably in the form of a slit cylinder, is provided with at least one cylinder cover 3, in which are integrated a shuttle valve 22, 23, 24, an adjustable vent throttling device and an adjustable end position throttling device.
  • the compressed air supply to the inlet opening 10 is immediately followed by a check valve 17, 19 in the cylinder cover 3, which prevents unforeseen and dangerous movements of the actuating cylinder in the event of a compressed air failure.
  • the control cover 36 can be flanged to the cylinder cover 3 in different rotational positions, as a result of which the pilot valve 48 can be rotated into a favorable position that corresponds to the respective circumstances.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP91105013A 1990-04-05 1991-03-28 Vérin à air comprimé Ceased EP0450518A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904011050 DE4011050A1 (de) 1990-04-05 1990-04-05 Druckluftbeaufschlagbarer betaetiguzngszylinder
DE4011050 1990-04-05

Publications (1)

Publication Number Publication Date
EP0450518A1 true EP0450518A1 (fr) 1991-10-09

Family

ID=6403844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105013A Ceased EP0450518A1 (fr) 1990-04-05 1991-03-28 Vérin à air comprimé

Country Status (2)

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EP (1) EP0450518A1 (fr)
DE (1) DE4011050A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0837248A3 (fr) * 1996-10-15 1998-10-28 Ab Rexroth Mecman Verin à fluide sous pression.
WO2013120380A1 (fr) * 2012-02-14 2013-08-22 宁波亚德客自动化工业有限公司 Structure intégrée d'étranglement et d'amortissement d'un cylindre pneumatique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19511524A1 (de) * 1995-03-29 1996-10-02 Rexroth Mannesmann Gmbh Arbeitszylinder mit Rohrbruchsicherungsventil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR73004E (fr) * 1954-07-30 1960-09-22 Dispositif de purge rapide pour vérin hydraulique
US3528339A (en) * 1968-05-27 1970-09-15 Donald E Darnell Air motor
EP0039976A2 (fr) * 1980-05-13 1981-11-18 Nedschroef Octrooi Maatschappij N.V. Dispositif pour transporter des pièces à usiner sur une machine-outil, d'un premier poste vers un poste suivant
EP0080579A1 (fr) * 1981-11-26 1983-06-08 WABCO Westinghouse Steuerungstechnik GmbH & Co. Dispositif de freinage en fin de course d'un piston de cylindre à double effet
FR2612573A1 (fr) * 1987-03-20 1988-09-23 Knorr Bremse Ag Cylindre a milieu sous pression et a double action

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE758207A (fr) * 1969-11-25 1971-04-01 Weyman Henry W Ensembles de cylindre pneumatique
DE2402567A1 (de) * 1974-01-19 1975-07-24 Kuhnke Gmbh Kg H Endlagendaempfung fuer hydraulische und pneumatische motore
DE2943255A1 (de) * 1979-10-26 1981-05-07 Erwin Hengstler Hydraulik GmbH, 7613 Hausach Laengenveraenderbarer hubzylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR73004E (fr) * 1954-07-30 1960-09-22 Dispositif de purge rapide pour vérin hydraulique
US3528339A (en) * 1968-05-27 1970-09-15 Donald E Darnell Air motor
EP0039976A2 (fr) * 1980-05-13 1981-11-18 Nedschroef Octrooi Maatschappij N.V. Dispositif pour transporter des pièces à usiner sur une machine-outil, d'un premier poste vers un poste suivant
EP0080579A1 (fr) * 1981-11-26 1983-06-08 WABCO Westinghouse Steuerungstechnik GmbH & Co. Dispositif de freinage en fin de course d'un piston de cylindre à double effet
FR2612573A1 (fr) * 1987-03-20 1988-09-23 Knorr Bremse Ag Cylindre a milieu sous pression et a double action

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0837248A3 (fr) * 1996-10-15 1998-10-28 Ab Rexroth Mecman Verin à fluide sous pression.
WO2013120380A1 (fr) * 2012-02-14 2013-08-22 宁波亚德客自动化工业有限公司 Structure intégrée d'étranglement et d'amortissement d'un cylindre pneumatique

Also Published As

Publication number Publication date
DE4011050A1 (de) 1991-10-10

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