EP0744553A2 - Actionneur linéaire sans tige - Google Patents

Actionneur linéaire sans tige Download PDF

Info

Publication number
EP0744553A2
EP0744553A2 EP96105940A EP96105940A EP0744553A2 EP 0744553 A2 EP0744553 A2 EP 0744553A2 EP 96105940 A EP96105940 A EP 96105940A EP 96105940 A EP96105940 A EP 96105940A EP 0744553 A2 EP0744553 A2 EP 0744553A2
Authority
EP
European Patent Office
Prior art keywords
linear drive
slot
housing
resistance
longitudinal
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.)
Granted
Application number
EP96105940A
Other languages
German (de)
English (en)
Other versions
EP0744553B1 (fr
EP0744553A3 (fr
Inventor
Kurt Dr. Stoll
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP0744553A2 publication Critical patent/EP0744553A2/fr
Publication of EP0744553A3 publication Critical patent/EP0744553A3/fr
Application granted granted Critical
Publication of EP0744553B1 publication Critical patent/EP0744553B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • 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
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2853—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using potentiometers

Definitions

  • the invention relates to a rodless linear drive, with a housing having a longitudinal slot, with a drive part arranged longitudinally in the housing, and with a transmission element connected to the drive part and projecting outward through the longitudinal slot.
  • a linear drive of this type in the form of a so-called slot cylinder is shown in DE 41 37 789 C2.
  • This comprises a drive part formed by a piston, which performs a linear movement when exposed to fluid, which can be tapped outside of the housing on the transmission member.
  • a load to be transported can be connected to the transmission link.
  • a housing-fixed resistance strip extending in the longitudinal direction of the slot is arranged in each case, that a sliding contact arrangement is provided on the transmission element, which is in contact with both resistance strips simultaneously and during the longitudinal movement of the transmission element slides along the resistance strip, and that connection means for connecting the two resistance strips with a position detection evaluation device are present.
  • the position of the drive part and all parts connected to it can be reliably detected according to the potentiometer principle.
  • the current longitudinal position there are different lengths of current pathways that affect the electrical resistance, by means of which the current relative position between the transmission element and the housing can be determined via the evaluation device.
  • the resistance strips are preferably arranged in longitudinal grooves which are formed in the slot flanks of the longitudinal slot. As a result, the slot width can be maintained and thus also the overall width of the transmission member which is relatively heavily loaded during operation.
  • the sliding contact arrangement expediently comprises two sliding contacts, each of which is resiliently biased against one of the resistance strips and is in electrical connection with one another. During the linear movement of the transmission element, the sliding contacts slide along the respectively assigned resistance strip, with the resilient bias always ensuring a safe electrical contact.
  • connection means can be connected directly to one or more cables which serve as further connection means for connecting the electrical evaluation device.
  • connection means are arranged on an axial end region of the housing, on the one hand they are connected to the resistance strips and on the other hand they enable the detachable electrical connection of the evaluation device as required.
  • connection means are preferably designed as plug-in connection means which enable the evaluation device to be connected via simple plug-in connections.
  • connection means are expediently arranged on the end face of the linear drive.
  • the connections for the supply and discharge of the pressurizing medium are also expediently located on this.
  • the linear drive according to the example is a fluid-actuated rodless working cylinder. Apart from the measures for position detection still to be explained, its structure can correspond to the linear drive described in DE 41 37 789 C2. Reference is made to the content of this publication, so that it is sufficient here to briefly summarize the basic structure.
  • the linear drive has an elongated housing 1, which is composed of a central part formed by a tubular body 2 and two end caps 3, 4 attached to the front ends of the tubular body 2.
  • the drive part 7 is a piston which axially divides the running chamber 5 into two working spaces 8, 8 '.
  • Each working space 8, 8 ' is connected to a channel, the two channels opening together at the end face 12 of one end cover 3.
  • the mouths form connection openings 13 for the supply and discharge of an actuating fluid, via which the drive part 7 can be driven to a linear movement in the longitudinal direction 6 of the housing.
  • the tubular body 2 has, at one point on its circumference, an elongated slot 14 extending over the entire length of the tube. This passes through the housing wall delimiting the running chamber 5 on the circumferential side in the radial direction, opening out radially inside to the running chamber 5 and radially outside to the surroundings of the housing 1.
  • An elongate-narrow transmission member 15 arranged on the drive part 7 passes through the longitudinal slot 14 and projects outwards, where it is in fixed connection with a schematically indicated driver 16.
  • the driver 16 in turn is suitable for connection to an object to be moved, for example a component of a handling device. Corresponding mounting holes are indicated at 17.
  • the drive part 7, the transmission member 15 and the driver 16 form a movement unit.
  • the driver 16 and thus the object attached to it are moved synchronously.
  • a flexible sealing tape 18 is assigned radially on the inside. It normally seals the longitudinal slot 14 from the inside. It is only in the area of the drive part 7 that it is lifted inward from the longitudinal slot 14 in order to allow the transmission member 15 to pass through.
  • the sealing tape 18 is passed through a recess 22 of the drive part 7 or the transmission member 15.
  • the linear drive is equipped with a position detection device, generally designated 22. In operation, it enables the current position of the movement unit 7, 15, 16 mentioned to be determined relative to the housing 1.
  • the position detection device 22 initially includes two resistance strips 23, 23 'made of electrically conductive material. One of these resistance strips 23, 23 'is fixed in the area of one of the slot flanks 24, 24' of the longitudinal slot 14. A respective resistance strip 23, 23 'runs in the longitudinal direction of the slot, wherein it extends at least essentially over the entire length of the slot.
  • each resistance strip 23, 23 ' is at least partially and preferably completely received in a longitudinal groove 25 which is formed in the relevant slot flank 24, 24' laterally delimiting the longitudinal slot 14.
  • a respective longitudinal groove 25 also contributes to the exactly parallel alignment of the associated resistance strip 23, 23 '; it can be directly molded in during the manufacture of the tubular body 2 as part of an extrusion process.
  • the housing 1 regularly consists of metal, for example of aluminum material.
  • An insulation layer 26 made of electrically insulating material is therefore expediently arranged between a respective resistance strip 23, 23 'and the housing material. It can be an integral part of the resistance strip 23, 23 '.
  • the end regions 27 of the resistance strips 23, 23 'assigned to the one end cover 3 are connected to electrical connection means 28 arranged fixed to the housing. These enable the connection of a position detection evaluation device 31, which is indicated schematically in FIG. 1.
  • the end regions of the resistance strips 23, 23 ′ assigned to the other end cover 4 run out in a freely ending manner.
  • a sliding contact arrangement 32 is provided on the transmission member 15 within the longitudinal slot 14. It is in contact with both resistance strips 23, 23 'at the same time. During the longitudinal movement of the transmission member 15, the sliding contact arrangement 32 slides along the two resistance strips 23, 23 '.
  • the sliding contact arrangement 32 thus represents an electrical connection between the two resistance strips 23, 23 'in the area of the transmission element 15.
  • the longitudinal slot 14 is practically bridged.
  • the location of the electrical connection varies depending on the longitudinal position of the transmission element 15, that is, it depends directly on the current relative position between the transmission element 15 and the housing 1.
  • the exemplary position detection evaluation device has a voltage source, not shown, via which a voltage is applied to the two resistance strips 23, 23 'using the electrical connection means 28. This creates a current flow.
  • the current flows from the voltage source via the one electrical connection means 28 into the one resistance strip 23, from there via the sliding contact arrangement 32 to the other resistance strip 23 'and via the assigned connection means 28 back to the evaluation device 31 electrical resistance generated by the resistance strips 23, 23 '.
  • This is determined by the axial length of the current-carrying length sections of the resistance strips 23, 23 ', which in turn depends on the current axial position of the sliding contact arrangement 32.
  • the strip sections through which current flows are longer, the further the transmission member 15 and the sliding contact arrangement 32 arranged thereon are from the connecting means 28.
  • the linear drive itself or other devices can then be controlled as required.
  • the sliding contact arrangement 32 preferably has two mutually independent sliding contacts 33, 33 ′, which are arranged in the region of the opposite longitudinal sides of the web-like transmission element 15.
  • the configuration is such that each sliding contact 33, 33 'is fixed on the one hand to the transmission member 15 and on the other hand works spring-loaded against the associated resistance strips 23, 23'. In this way, there is an elastic resilience in the transverse direction of the longitudinal slot 14, which ensures that the sliding contacts 33, 33 'always keep safe contact with the resistance strips 23, 23'.
  • the sliding contacts 33, 33 'could for example, be formed by leaf spring-like contact elements.
  • each sliding contact 33, 33 ' is designed as a sliding shoe, with the two sliding contacts 33, 33' being slidably mounted in the transverse slot direction in a guide bore 34 which extends transversely through the transmission member 15.
  • a spring device 35 formed by a compression spring, extends between the sliding contacts 33, 33 'and presses both sliding contacts 33, 33' outward against the associated resistance strips 23, 23 '.
  • the two sliding contacts 33, 33 ' are electrically connected to one another, which in the present case takes place via a flexible electrical conductor 42 which is fixed to the two sliding contacts 33, 33'. It would also be conceivable to use the spring device 35 as an electrical connecting conductor.
  • the guide bore 34 is expediently lined with electrically insulating material 49.
  • connection means 28 already mentioned are preferably designed as plug-in connection means and, as shown, are arranged on the same end face 12 of the end cover 4 as are the connection openings 13 for the pressure medium supply.
  • the position detection evaluation device 41 is connected via cable 43 to complementary counter-connecting means 44, which are formed, for example, by a plug and can be detachably connected to the plug-connecting means 28 in the context of a plug connection.
  • a more installation-friendly solution is provided.
  • a connector 45 which has complementary first and second connectors 46, 47.
  • the first plug connectors 46 are in the region of the end face of the tubular body 2 at the ends of the resistance strips 23, 23 'attached.
  • the second plug connectors 47 are located opposite one another on the end cover 3 and are connected to the connection means 28 via internal electrical conductors 48.
  • the linear drive is very connection-friendly. It is preferably a pneumatically operated linear drive.
  • the arrangement according to the invention of a position detection device can also be implemented on other linear drives which have a transmission element which penetrates a longitudinal slot in the housing.
  • electric linear drives in which the drive part 7 is driven by an electric motor are considered here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission Devices (AREA)
  • Adjustable Resistors (AREA)
  • Fluid-Damping Devices (AREA)
  • Vehicle Body Suspensions (AREA)
EP96105940A 1995-05-23 1996-04-16 Actionneur linéaire sans tige Expired - Lifetime EP0744553B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29508517U DE29508517U1 (de) 1995-05-23 1995-05-23 Kolbenstangenloser Linearantrieb
DE29508517U 1995-05-23

Publications (3)

Publication Number Publication Date
EP0744553A2 true EP0744553A2 (fr) 1996-11-27
EP0744553A3 EP0744553A3 (fr) 1999-08-11
EP0744553B1 EP0744553B1 (fr) 2003-03-12

Family

ID=8008437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105940A Expired - Lifetime EP0744553B1 (fr) 1995-05-23 1996-04-16 Actionneur linéaire sans tige

Country Status (4)

Country Link
US (1) US5662022A (fr)
EP (1) EP0744553B1 (fr)
KR (1) KR100193328B1 (fr)
DE (2) DE29508517U1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813371C2 (de) * 1998-03-26 2001-12-20 Festo Ag & Co Kolbenstangenloser Linearantrieb
DE20014353U1 (de) 2000-08-19 2000-12-07 Festo AG & Co, 73734 Esslingen Linearantrieb
DE20100672U1 (de) 2001-01-16 2001-03-22 Festo AG & Co, 73734 Esslingen Linearantrieb mit Positionserfassungseinrichtung
DE20106298U1 (de) * 2001-04-10 2001-06-21 FESTO AG & Co., 73734 Esslingen Linearantrieb
DE20300571U1 (de) 2003-01-15 2003-03-13 FESTO AG & Co., 73734 Esslingen Linearantrieb mit Positionserfassungsmitteln
US6917515B2 (en) * 2003-04-28 2005-07-12 Kita Sensor Tech. Co., Ltd. Electrical component having a housing retained in a receiving groove in a support through a retaining device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244616C2 (de) * 1982-12-02 1986-06-19 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Vorrichtung zur Messung von Vorschubbewegungen
DE3520199A1 (de) * 1984-10-05 1986-04-10 Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover Potentiometer
DE9101734U1 (de) * 1991-02-15 1991-05-23 Hygrama Ag, Rotkreuz Druckmittelzylinder
DE4241189A1 (de) * 1992-12-03 1994-06-09 Mannesmann Ag Einrichtung zur Positionsermittlung bei einem druckmittelbetriebenen Arbeitszylinder

Also Published As

Publication number Publication date
KR960041770A (ko) 1996-12-19
DE59610210D1 (de) 2003-04-17
US5662022A (en) 1997-09-02
EP0744553B1 (fr) 2003-03-12
EP0744553A3 (fr) 1999-08-11
DE29508517U1 (de) 1995-08-10
KR100193328B1 (ko) 1999-06-15

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