SI25555A - Device for detecting the position of the piston in the fluid pressure cylinder - Google Patents

Device for detecting the position of the piston in the fluid pressure cylinder Download PDF

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Publication number
SI25555A
SI25555A SI201700294A SI201700294A SI25555A SI 25555 A SI25555 A SI 25555A SI 201700294 A SI201700294 A SI 201700294A SI 201700294 A SI201700294 A SI 201700294A SI 25555 A SI25555 A SI 25555A
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SI
Slovenia
Prior art keywords
fluid pressure
pressure cylinder
permanent magnet
piston
magnetic
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Application number
SI201700294A
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Slovenian (sl)
Inventor
Vinko JurÄŤiÄŤ
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INES d.o.o.
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Application filed by INES d.o.o. filed Critical INES d.o.o.
Priority to SI201700294A priority Critical patent/SI25555A/en
Priority to EP18000841.9A priority patent/EP3483456A1/en
Publication of SI25555A publication Critical patent/SI25555A/en

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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
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
    • 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
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Izum se nanaša na napravo za zaznavanje položaja bata v fluidnem tlačnem valju z magnetnim senzorjem. Tehnični problem je, kako zasnovati napravo, pri kateri ne bo omejitev glede izbora materiala fluidnega tlačnega valja na nemagnetne materiale ter izboljšati njeno zanesljivost. Tehnični problem je rešen z napravo (1) za zaznavanje položaja bata v fluidnem tlačnem valju, še zlasti hidravličnem valju, ki obsega fluidni tlačni valj (2), bat (3), ki lahko drsi sem ter tja vzdolž notranje obodne ploskve fluidnega tlačnega valja (2), batni drog (4), ki je s prvim koncem povezan z batom (3), in z drugim koncem prehaja skozi čelno stran fluidnega tlačnega valja (2), trajni magnet (5), katerega gibanje je skladno z gibanjem bata (3), in vsaj eno magnetno stikalo (6), ki je razmeščeno na zunanji strani fluidnega tlačnega valja (2), in ki ga je moč aktivirati z omenjenim trajnim magnetom (5), pri čemer je trajni magnet (5) razmeščen na zunanji strani fluidnega tlačnega valja (2).The invention relates to a device for detecting the position of the piston in the fluid pressure cylinder with a magnetic sensor. The technical problem is how to design a device where there will be no restrictions on selecting the material of the fluid pressure cylinder on non-magnetic materials and improving its reliability. The technical problem is solved by means of a device for detecting the position of the piston in the fluid pressure cylinder, in particular a hydraulic cylinder comprising a fluid pressure roller (2), a piston (3) which can slide there and there along the inner peripheral surface of the fluid pressure cylinder (2), a piston rod (4) which is connected to the first end by a piston (3), and with the other end passes through the front of the fluid pressure cylinder (2), a permanent magnet (5) whose movement is in accordance with the movement of the piston (3), and at least one magnetic switch (6) disposed on the outside of the fluid pressure cylinder (2) and which can be activated with said permanent magnet (5), wherein the permanent magnet (5) is disposed on outside of the fluid pressure cylinder (2).

Description

Naprava za zaznavanje položaja bata v fluidnem tlačnem valjuDevice for detecting the position of the piston in the fluid pressure cylinder

Tehnično področjeTechnical field

Izum se nanaša na napravo za zaznavanje položaja bata v fluidnem tlačnem valju z magnetnim senzorjem, še zlasti hidravličnem valju.The invention relates to a device for detecting the position of the piston in the fluid pressure cylinder with a magnetic sensor, in particular a hydraulic cylinder.

Stanje tehnikeState of the art

Patentna prijava US 4793241 Al razkriva detektor položaja bata za fluidni tlačni valj, ki deluje s pomočjo tlaka fluida. Naprava obsega nemagnetni valj, bat, ki je drsno razmeščen v valju, obročast trajni magnet, ki je razmeščen okrog oboda bata, in pa element za zaznavo magnetnega polja, kije razmeščen na plašču valja, in se odziva na magnetno polje trajnega magneta, ko se le-ta giblje znotraj valja, in generira električne signale. Valj je tvorjen iz nemagnetnega materiala, kot je aluminij ali nemagnetno jeklo.Patent Application US 4793241 A1 discloses a plunger position detector for a fluid pressure cylinder operating through a fluid pressure. The device comprises a non-magnetic cylinder, a piston slidably disposed in the cylinder, an annular permanent magnet disposed around the pocket of the piston, and an element for detecting a magnetic field disposed on the cylinder jacket and reacting to the magnetic field of the permanent magnet when it moves inside the cylinder, and generates electrical signals. The cylinder is made of non-magnetic material, such as aluminum or non-magnetic steel.

Tehnični problemTechnical problem

Tehnični problem je, kako zasnovati napravo za zaznavanje položaja bata v fluidnem tlačnem valju, še zlasti hidravličnem valju, pri kateri ne bo omejitev glede izbora materiala fluidnega tlačnega valja na nemagnetne materiale, kot je na primer aluminij ali avstenitno jeklo, da bo torej za material fluidnega tlačnega valja moč izbrati tudi cenejši material, kot je na primer navadno konstrukcijsko magnetno jeklo. Nadaljnji cilj izuma je zasnovati napravo, katere zanesljivost delovanja bo večja.The technical problem is how to design a device for detecting the position of the piston in the fluid pressure cylinder, in particular a hydraulic cylinder, in which there will be no restrictions on the selection of the material of the fluid pressure cylinder to non-magnetic materials, such as, for example, aluminum or austenitic steel, It is also possible to select a cheaper material, such as a conventional magnetic steel, for example, a fluid pressure cylinder. Another object of the invention is to design a device whose reliability will be greater.

Rešitev tehničnega problemaSolving the technical problem

Tehnični problem je rešen z napravo za zaznavanje položaja bata v fluidnem tlačnem valju, še zlasti hidravličnem valju, ki obsega: - fluidni tlačni valj, - bat, ki lahko drsi sem ter tja vzdolž notranje obodne ploskve fluidnega tlačnega valja, - batni drog, ki je z prvim koncem povezan z batom, in z drugim koncem prehaja skozi čelno stran fluidnega tlačnega valja, - trajni magnet, ki je razmeščen na zunanji strani fluidnega tlačnega valja tako, daje njegovo gibanje skladno z gibanjem bata, in - vsaj eno magnetno stikalo, ki je razmeščeno na zunanji strani fluidnega tlačnega valja, in ki gaje moč aktivirati z omenjenim trajnim magnetom.The technical problem is solved by means of a device for detecting the position of the piston in the fluid pressure cylinder, in particular a hydraulic cylinder, comprising: a fluid pressure cylinder, a piston that can slide here and there along the inner peripheral surface of the fluid pressure cylinder, a piston rod with the first end being connected to the piston and with the other end passing through the front of the fluid pressure cylinder, a permanent magnet arranged on the outside of the fluid pressure cylinder in such a way that its movement is consistent with the movement of the piston, and at least one magnetic switch, which is disposed on the outside of the fluid pressure cylinder and which can be activated by said permanent magnet.

Ker sta tako trajni magnet kot tudi magnetno stikalo razmeščena izven fluidnega tlačnega valja, izbor materiala ni več omejen na nemagnetne materiale, kot je npr. aluminij ali avstenitno jeklo. Za material fluidnega tlačnega valja je mogoče izbrati tudi magnetne materiale, kot so martenzitna ali feritna jekla. Nabor možnih materialov je tako širši in je tako mogoče izbrati cenejši material, kot je npr. navadno konstrukcijsko jeklo.Since both the permanent magnet and the magnetic switch are located outside the fluid pressure cylinder, the material selection is no longer limited to non-magnetic materials, such as, for example, aluminum or austenitic steel. Magnetic materials such as martensitic or ferrite steels can be selected for the material of the fluid pressure cylinder. The range of possible materials is so wider and so it is possible to choose a cheaper material, such as, for example, usually structural steel.

Naprava po izumu pa ima še mnoge druge prednosti pred znanim stanjem tehnike. Ena teh prednosti je večja zanesljivost in natančnost zaznavanja magnetnih silnic trajnega magneta. Kadar je trajni magnet razmeščen znotraj fluidnega tlačnega valja namreč pride do distorzije magnetnih silnic zaradi vpliva stene fluidnega tlačnega valja, zaradi nabiranja drobnih kovinskih delcev na trajnem magnetu, in pa zaradi povišane temperature znotraj fluidnega tlačnega valja. Fluid v fluidnem tlačnem valju se med delovanjem zaradi povišanega tlaka fluida segreva. Trajni magnet, ki je izpostavljen povišani temperaturi, pa ima namreč šibkejše magnetno polje. Z napravo po izumu so te slabosti odpravljene in zanesljivost delovanja naprave povečana, hkrati pa se podaljša tudi življenjska doba naprave. Nadaljnja prednost naprave po izumu se izkaže v primeru potrebe po servisnem posegu, pri katerem je treba trajni magnet zamenjati, saj ni potrebno posegati v notranjost fluidnega tlačnega valja.The device according to the invention still has many other advantages over the known state of the art. One of these advantages is greater reliability and accuracy of the detection of permanent magnet magnetic silences. When a permanent magnet is located inside the fluid pressure cylinder, magnetic forces are distorted due to the impact of the wall of the fluid pressure cylinder, due to the accumulation of fine metal particles on a permanent magnet, and due to the increased temperature inside the fluid pressure cylinder. Fluid in the fluid pressure cylinder is heated during operation due to the elevated pressure of the fluid. A permanent magnet, which is exposed to an elevated temperature, has a weaker magnetic field. With the device according to the invention, these weaknesses have been eliminated and the reliability of the operation of the device is increased, while the lifetime of the device is also prolonged. A further advantage of the device according to the invention is shown in the case of need for a service operation in which the permanent magnet needs to be replaced, as it is not necessary to encroach on the interior of the fluid pressure cylinder.

Slika 1: Naprava za zaznavanje položaja bata v fluidnem tlačnem valju V nadaljevanju je izum opisan podrobneje.Figure 1: Piston Position Sensing Device in a Fluid Pressure Roller The invention is described in greater detail below.

Tehnični problem je rešen z napravo 1 za zaznavanje položaja bata v fluidnem tlačnem valju, še zlasti hidravličnem valju, ki obsega: - fluidni tlačni valj 2, - bat 3, ki lahko drsi sem ter tja vzdolž notranje obodne ploskve fluidnega tlačnega valja, - batni drog 4, ki je z prvim koncem povezan z batom, in z drugim koncem prehaja skozi čelno stran fluidnega tlačnega valja, - trajni magnet 5, ki je razmeščen na zunanji strani fluidnega tlačnega valja tako, daje njegovo gibanje skladno z gibanjem bata 3, in - vsaj eno magnetno stikalo 6, ki je razmeščeno na zunanji strani fluidnega tlačnega valja, in ki ga je moč aktivirati z omenjenim trajnim magnetom 5.The technical problem is solved with the device 1 for detecting the position of the piston in the fluid pressure cylinder, in particular the hydraulic cylinder, which comprises: - a fluid pressure cylinder 2, - a piston 3 which can slide there and there along the inner peripheral surface of the fluid pressure cylinder, - piston a rod 4 which is connected to the first end with a piston and passes through the end of the fluid pressure cylinder to the end of the fluid end; a permanent magnet 5 disposed on the outside of the fluid pressure cylinder in such a way that its movement is consistent with the movement of the piston 3; - at least one magnetic switch 6 disposed on the outside of the fluid pressure cylinder and which can be activated with said permanent magnet 5.

Na drugem koncu batnega droga je izven fluidnega tlačnega valja 2 predvidena fiksirana ročica 7, ki nosi nosilec 8 trajnega magneta, ki je razmeščen v bistvu vzporedno z osjo fluidnega tlačnega valja 2. Trajni magnet 5 je fiksiran na nosilcu 8 trajnega magneta. Nosilec 8 trajnega magneta je lahko tvorjen v obliki cevke iz nemagnetnega materiala, v kateri je sprejet trajen magnet 5.On the other end of the piston rod, a fixed lever 7 is provided outside the fluid pressure cylinder 2 carrying the permanent magnet holder 8 which is arranged substantially parallel to the axis of the fluid pressure cylinder 2. The permanent magnet 5 is fixed on the permanent magnet holder 8. The permanent magnet holder 8 may be formed in the form of a non-magnetic material tube in which a permanent magnet 5 is adopted.

Material fluidnega tlačnega valja 2 je mogoče izbrati tudi med magnetnimi materiali, kot so npr. martenzitna ali feritna jekla.The material of the fluid pressure cylinder 2 can also be selected from magnetic materials such as, for example, martensite or ferrite steel.

Magnetno stikalo 6 je lahko razmeščeno na zunanji strani fluidnega tlačnega valja fiksno ali pomično nastavljivo na nosilcu 9 magnetnega stikala.The magnetic switch 6 can be arranged on the outer side of the fluid pressure cylinder fixed or movable on the magnet switch holder 9.

Magnetno stikalo 6 je lahko stikalo Reed ali drugo stikalo, tvorjeno s pomočjo katerega koli znanega magnetnega senzorja, kot npr. Hall, AMR, GMR ipd.The magnetic switch 6 may be a Reed switch or a second switch formed by any known magnetic sensor, such as, for example, Hall, AMR, GMR etc.

Za boljše vodenje nosilca 8 trajnega magneta je fluidni tlačni valj 2 lahko opremljen z vodilom 10, kije lahko izvedeno kot skoznja luknja v prirobnici 11 fluidnega tlačnega valja, tvoijena v njegovi aksialni smeri.For better control of the permanent magnet holder 8, the fluid pressure cylinder 2 may be provided with a guide 10, which can be made as a through hole in the flange 11 of the fluid pressure cylinder, twisted in its axial direction.

Pri delovanju naprave se bat giblje znotraj fluidnega tlačnega valja. Gibanje bata se preko batnega droga 4, ročice 7 in nosilca 8 trajnega magneta prenaša na trajni magnet 5. Ko pride trajni magnet 5 v področje magnetnega stikala 6, le-to zazna magnetno polje trajnega magneta in generira signal za krmiljenje bata 3.When operating the device, the piston moves within the fluid pressure cylinder. The piston movement is transmitted to the permanent magnet 5 via the piston rod 4, the lever 7, and the permanent magnet holder 8. When the permanent magnet 5 enters the magnetic switch region 6, it detects the magnetic field of the permanent magnet and generates a signal for the control of the piston 3.

Claims (10)

Patentni zahtevkiPatent claims 1. Naprava (1) za zaznavanje položaja bata v fluidnem tlačnem valju, še zlasti hidravličnem valju, ki obsega: - fluidni tlačni valj (2), - bat (3), ki lahko drsi sem ter tja vzdolž notranje obodne ploskve fluidnega tlačnega valja (2), - batni drog (4), ki je z prvim koncem povezan z batom (3), in z drugim koncem prehaja skozi čelno stran fluidnega tlačnega valja (2), - trajni magnet (5), katerega gibanje je skladno z gibanjem bata (3), in - vsaj eno magnetno stikalo (6), ki je razmeščeno na zunanji strani fluidnega tlačnega valja (2), in ki ga je moč aktivirati z omenjenim trajnim magnetom (5), značilna po tem, da je trajni magnet (5) razmeščen na zunanji strani fluidnega tlačnega valja (2).A piston positioning device (1) in a fluid pressure cylinder, in particular a hydraulic cylinder, comprising: - a fluid pressure cylinder (2), - a piston (3) which can slide there and there along the inner peripheral surface of the fluid pressure cylinder (2), - a piston rod (4) which is connected to the first end by a piston (3), and with the other end passes through the front of the fluid pressure cylinder (2), - a permanent magnet (5) whose movement is in accordance with with the movement of the piston (3), and - at least one magnetic switch (6) disposed on the outside of the fluid pressure cylinder (2) and which can be activated with said permanent magnet (5), characterized in that the permanent The magnet (5) is disposed on the outside of the fluid pressure cylinder (2). 2. Naprava (1) po zahtevku 1, značilna po tem, daje na drugem koncu batnega droga izven fluidnega tlačnega valja (2) predvidena fiksirana ročica (7), ki nosi nosilec (8) trajnega magneta, ki je razmeščen v bistvu vzporedno z osjo fluidnega tlačnega valja (2).A device (1) according to claim 1, characterized in that a fixed lever (7) carrying a permanent magnet holder (8) is arranged outside the fluid pressure cylinder (2) at the other end of the piston rod, which is arranged substantially parallel to axis of the fluid pressure cylinder (2). 3. Naprava (1) po zahtevku 2, značilna po tem, da je trajni magnet (5) fiksiran na nosilcu (8) trajnega magneta.Device (1) according to claim 2, characterized in that the permanent magnet (5) is fixed on the permanent magnet holder (8). 4. Naprava (1) po zahtevku 2 ali 3, značilna po tem, daje trajni magnet (5) fiksiran na nosilcu (8) trajnega magneta.Apparatus (1) according to claim 2 or 3, characterized in that the permanent magnet (5) is fixed on the permanent magnet holder (8). 5. Naprava (1) po katerem koli od zahtevkov od 2 do 4, značilna po tem, daje nosilec (8) trajnega magneta tvorjen v obliki cevke iz nemagnetnega materiala, v kateri je sprejet trajen magnet (5).Device (1) according to any one of claims 2 to 4, characterized in that the permanent magnet holder (8) is formed in the form of a non-magnetic material tube in which a permanent magnet (5) is received. 6. Naprava (1) po katerem koli od predhodnih zahtevkov, značilna po tem, da je material fluidnega tlačnega valja (2) izbran med martenzitnimi ali feritnimi jekli.Device (1) according to any one of the preceding claims, characterized in that the material of the fluid pressure cylinder (2) is selected from martensite or ferrite steel. 7. Naprava (1) po katerem koli od predhodnih zahtevkov, značilna po tem, da obsega nosilec (9) magnetnega stikala, na katerem magnetno stikalo (6) razmeščeno pomično nastavljivo.Device (1) according to any one of the preceding claims, characterized in that it comprises a magnetic switch holder (9) on which the magnetic switch (6) is arranged in a movable manner. 8. Naprava (1) po katerem koli od predhodnih zahtevkov, značilna po tem, da je magnetno stikalo (6) stikalo Reed.Device (1) according to any one of the preceding claims, characterized in that the magnetic switch (6) is a Reed switch. 9. Naprava (1) po katerem koli od zahtevkov od 1 do 7, značilna po tem, da je magnetno stikalo (6) stikalo tvorjeno z magnetnim senzorjem, izbranim med senzorjem Hall, AMR ali GMR.Device (1) according to any one of claims 1 to 7, characterized in that the magnetic switch (6) of the switch is formed by a magnetic sensor selected between the Hall, AMR or GMR sensors. 10. Naprava (1) po katerem koli od zahtevkov od 2 do 9, značilna po tem, daje fluidni tlačni valj (2) opremljen z vodilom (10), kije izvedeno kot skoznja luknja v prirobnici (11) fluidnega tlačnega valja, tvorjena v njegovi aksialni smeri.Device (1) according to one of claims 2 to 9, characterized in that the fluid pressure cylinder (2) is provided with a guide (10) made as a through hole in the flange (11) of the fluid pressure cylinder formed in its axial direction.
SI201700294A 2017-11-08 2017-11-08 Device for detecting the position of the piston in the fluid pressure cylinder SI25555A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201700294A SI25555A (en) 2017-11-08 2017-11-08 Device for detecting the position of the piston in the fluid pressure cylinder
EP18000841.9A EP3483456A1 (en) 2017-11-08 2018-10-29 Device for detecting position of a piston in a fluid pressure cylinder

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SI201700294A SI25555A (en) 2017-11-08 2017-11-08 Device for detecting the position of the piston in the fluid pressure cylinder

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444493A (en) * 1966-08-29 1969-05-13 Ca Atomic Energy Ltd Magnetically operated reed switch assembly
US4176264A (en) * 1976-08-04 1979-11-27 Electro-Mechanical Products Linear programmer for an actuator
JPS63122902A (en) 1986-11-13 1988-05-26 Ckd Controls Ltd Apparatus for confirming position of moving body
JP4525155B2 (en) * 2004-04-26 2010-08-18 Ｓｍｃ株式会社 Linear actuator
FR2925673B1 (en) * 2007-12-21 2009-12-18 Bosch Gmbh Robert LINEAR SENSOR WITH ANGLE DISPLACEMENT AND CABLE DISPLACEMENT
JP6240983B2 (en) * 2014-04-01 2017-12-06 Smc株式会社 Fluid pressure cylinder
JP6501657B2 (en) * 2015-07-08 2019-04-17 株式会社堀内機械 Hydraulic cylinder device

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Effective date: 20190604