ES8306520A1 - Hydraulic ram with stroke indication - Google Patents

Hydraulic ram with stroke indication

Info

Publication number
ES8306520A1
ES8306520A1 ES515918A ES515918A ES8306520A1 ES 8306520 A1 ES8306520 A1 ES 8306520A1 ES 515918 A ES515918 A ES 515918A ES 515918 A ES515918 A ES 515918A ES 8306520 A1 ES8306520 A1 ES 8306520A1
Authority
ES
Spain
Prior art keywords
magnets
piston rod
hydraulic ram
cylinder
poles
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.)
Expired
Application number
ES515918A
Other languages
Spanish (es)
Other versions
ES515918A0 (en
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.)
Gewerkschaft Eisenhutte Westfalia GmbH
Original Assignee
Gewerkschaft Eisenhutte Westfalia 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
Application filed by Gewerkschaft Eisenhutte Westfalia GmbH filed Critical Gewerkschaft Eisenhutte Westfalia GmbH
Publication of ES8306520A1 publication Critical patent/ES8306520A1/en
Publication of ES515918A0 publication Critical patent/ES515918A0/en
Granted legal-status Critical Current

Links

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
    • F15B15/2815—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

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)
  • Actuator (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

A hydraulic ram 11 has a piston rod 22 reciprocable relative to a cylinder. The piston rod 22 is provided with a plurality of longitudinally- spaced permanent magnets embedded therein. Two sensors 25 and 26 are provided for sensing movement of the magnets, and hence relative movement between the piston rod 22 and the cylinder. The arrangement is such that any pair of adjacent magnets are sensed by different sensors 25 and 26. The magnets may be in single or double rows. In a single row, the outermost pole of each in the rod alternates. In a double row, one may have south poles the other north poles, or both rows may have the same poles. Magnets 30, 31 denoting end positions are provided.
ES515918A 1981-09-24 1982-09-23 IMPROVEMENTS IN A HYDRAULIC ALTERNATIVE PLUNGER MECHANISM FOR UNDERGROUND OPERATIONS. Granted ES515918A0 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3137951A DE3137951C2 (en) 1981-09-24 1981-09-24 Hydraulic push-piston gear, in particular for use as a back and forth cylinder in underground mining operations, with permanent magnets arranged on the piston rod

Publications (2)

Publication Number Publication Date
ES8306520A1 true ES8306520A1 (en) 1983-06-01
ES515918A0 ES515918A0 (en) 1983-06-01

Family

ID=6142459

Family Applications (1)

Application Number Title Priority Date Filing Date
ES515918A Granted ES515918A0 (en) 1981-09-24 1982-09-23 IMPROVEMENTS IN A HYDRAULIC ALTERNATIVE PLUNGER MECHANISM FOR UNDERGROUND OPERATIONS.

Country Status (9)

Country Link
JP (1) JPS5869997A (en)
AU (1) AU8856582A (en)
BE (1) BE894469A (en)
DE (1) DE3137951C2 (en)
ES (1) ES515918A0 (en)
FR (1) FR2513370A1 (en)
GB (1) GB2106984B (en)
PL (1) PL135861B1 (en)
ZA (1) ZA826989B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241237C2 (en) * 1982-11-09 1985-10-24 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Thrust piston gear, in particular for use as a return cylinder in mining operations, with a permanent magnet system arranged on the piston rod
DE3507937C2 (en) * 1985-03-06 1987-01-02 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Device for direction-related recording and transmission of path lengths in hydraulic striding
DE3508479A1 (en) * 1985-03-09 1986-09-11 Ruhrkohle Ag, 4300 Essen Device for displacement measurement, for example measuring of the return travel during mining operations in coal mining
DE3518162C1 (en) * 1985-05-21 1986-04-24 Bochumer Eisenhütte Heintzmann GmbH & Co KG, 4630 Bochum Device for monitoring the synchronism of a back cylinder and a cap sliding cylinder
DK195886A (en) * 1986-04-29 1987-10-30 Niels Hvilsted WORKING CYLINDER WITH STAMP AND WITH A MAGNETIC DEVICE FOR DETERMINING A STAMP POSITION
CH674058A5 (en) * 1986-10-22 1990-04-30 Festo Kg
JPH02186102A (en) * 1989-01-10 1990-07-20 Nakamura Koki Kk Piston position detecting device for piston type accumulator
DE9412435U1 (en) * 1994-08-02 1994-09-29 Festo Kg, 73734 Esslingen Working cylinder
DE19724388A1 (en) * 1997-06-10 1998-12-17 Bosch Gmbh Robert Displacement sensor
DE10219950C1 (en) * 2002-05-03 2003-10-30 Hilti Ag Pneumatic hammer mechanism with magnetic field sensitive sensor
EP2009404A3 (en) 2007-06-29 2014-12-24 Melexis Technologies NV Magnetic structure for detecting a relative motion between the magnetic structure and a magnetic field sensor
US8857530B2 (en) 2011-03-07 2014-10-14 Cnh Industrial Canada, Ltd. Automatic depth control system for an agricultural implement
WO2018064671A1 (en) 2016-09-30 2018-04-05 Milwaukee Electric Tool Corporation Power tool
DE102018002053A1 (en) * 2018-03-14 2019-09-19 Festo Ag & Co. Kg Piston for a drive device, drive device and method for producing a piston

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2917609C2 (en) * 1979-05-02 1985-12-19 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Device for controlling the pre-pledging caps of a walking support depending on the progress of the dismantling
DE2933557C2 (en) * 1979-08-18 1982-11-04 Robert Bosch Gmbh, 7000 Stuttgart Transmitter for non-contact distance or speed measurement
DE2945895C2 (en) * 1979-11-14 1986-06-05 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Magnetic position transmitter for hydraulic or pneumatic working cylinders

Also Published As

Publication number Publication date
GB2106984A (en) 1983-04-20
JPS5869997A (en) 1983-04-26
DE3137951C2 (en) 1985-10-17
ES515918A0 (en) 1983-06-01
PL238318A1 (en) 1983-05-23
DE3137951A1 (en) 1983-04-07
BE894469A (en) 1983-01-17
GB2106984B (en) 1985-01-23
ZA826989B (en) 1983-07-27
FR2513370A1 (en) 1983-03-25
PL135861B1 (en) 1985-12-31
AU8856582A (en) 1983-03-31

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