EP3702628A1 - Dispositif de détection de la hauteur de levage d'une tige de piston dans un cylindre - Google Patents

Dispositif de détection de la hauteur de levage d'une tige de piston dans un cylindre Download PDF

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Publication number
EP3702628A1
EP3702628A1 EP20401010.2A EP20401010A EP3702628A1 EP 3702628 A1 EP3702628 A1 EP 3702628A1 EP 20401010 A EP20401010 A EP 20401010A EP 3702628 A1 EP3702628 A1 EP 3702628A1
Authority
EP
European Patent Office
Prior art keywords
piston rod
cylinder
sensor
movement
guide member
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.)
Withdrawn
Application number
EP20401010.2A
Other languages
German (de)
English (en)
Inventor
Karl-Peter Hoffmann
Geert Hermann Schmidt
Marcus Oldenburger
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.)
Amazonen Werke H Dreyer SE and Co KG
Original Assignee
Amazonen Werke H Dreyer 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 Amazonen Werke H Dreyer SE and Co KG filed Critical Amazonen Werke H Dreyer SE and Co KG
Publication of EP3702628A1 publication Critical patent/EP3702628A1/fr
Withdrawn legal-status Critical Current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
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • 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

Definitions

  • the invention relates to a device for detecting the stroke height of a piston rod within a cylinder according to the preamble of patent claim 1.
  • the measuring device has previously had to be taken into account in the design of the cylinder components within the pressure range. It must therefore be decided in the planning from the outset whether a designed cylinder should enable position detection. This in turn has a negative impact on the price of the entire series of a cylinder type.
  • FIG EP 1 070 856 B1 Such a device for detecting the stroke height of a piston rod within a cylinder, in particular a hydraulic cylinder, is shown in FIG EP 1 070 856 B1 described. It is known to use rotation angle sensors to detect the stroke height of a piston rod within a cylinder.
  • a motion converter in the form of a measuring rod designed as a rod with a twist in the longitudinal direction, which protrudes through a bore, for example into a piston rod and is forcibly guided by this, converts the translational movement of the piston rod into a rotational movement about a rotational axis detected by the rotation angle sensor.
  • This rotation angle sensor in turn generates an electrical signal from the rotation movement generated in this way, depending on the rotation angle detected, which correlates with the stroke height of the piston rod via the movement converter.
  • the object on which the invention is based is thus to design a device for detecting the lifting height in such a way that it can be used in a simple and versatile manner.
  • the stroke height of the piston rod can be recorded without having to implement variable-component measures on the cylinder or taking these into account when designing the cylinder.
  • No additional openings are required in addition to the existing fluid connection openings and the piston rod leadthrough in the cylinder head, which significantly reduces the risk of later leakage through defective seals.
  • This also makes it possible to use angle sensors with different dimensions that are at least approximately independent of the geometry of the cylinder. Furthermore, if a repair and / or replacement is necessary, the Sensor device the dismantling of the cylinder is not absolutely necessary, so that the assembly effort is considerably reduced.
  • the motion converter is designed as a transmission which, driven by the translational movements of the piston rod, leads to a rotary movement about the detected axis of rotation of the angle of rotation sensor.
  • the transmission can consist of two components, at least one of which is detachably connected to the piston rod.
  • the motion converter protrudes at least partially into the guide track of the guide member and is positively guided by this. This enables a particularly reliable change in the position of the motion converter and thus leads to the measurement method being less prone to errors.
  • the guideway can be designed depending on the required measurement resolution.
  • the movement converter is designed as a lever and is mounted rotatably about the axis of rotation of the angle of rotation sensor. This means that the position of the angle of rotation sensor can be removed as far as desired from the piston rod. As a result, a more flexible positioning of the sensor device is achieved.
  • the direct coupling of the lever to the axis of rotation of the angle of rotation sensor achieves a very high level of accuracy, which manages with almost no transmission losses between the piston rod and the angle of rotation sensor. Furthermore, the almost free choice of the lever length can influence the transmission accuracy or measurement accuracy of the sensor device.
  • the guide track does not run at least partially parallel to the linear axis of the piston rod.
  • the The contour of the guideway is designed in such a way that in each case, while the motion converter traverses the non-parallel area of the guideway to the linear axis of the piston rod, a contact surface with a protruding part of the motion converter is created. In this way it is achieved that through the stroke movement of the piston rod, the protruding part of the movement converter, through the limiting inner contour of the guide track, an at least approximately play-free displacement transversely to the linear axis of the piston rod is imposed.
  • the guide track is designed in such a way that it has at least one linear section, so that the linear section encloses an angle greater than zero degrees to the linear axis of the piston rod.
  • sections of the guideway are preferably designed with a more obtuse angle to the linear axis of the piston rod in order to obtain a larger signal deflection of the angle of rotation sensor during the traverse for the detection of critical stroke areas.
  • Critical stroke areas such as shortly before the end position of the piston rod, can be viewed more precisely.
  • a device for detecting the lifting height is preferred, in which the guide track has at least one end region which runs at least approximately parallel to the linear axis of the piston rod. Due to the parallel running end areas, among other things, a buffer zone can be used for a gentle entry and / or exit of the motion converter into or out of the guideway. Sudden jolts of the piston rod, which mainly occur in the end positions, are at least approximately not passed on to the sensor device and the upstream mechanism. In addition, this makes it possible to detect only certain intermediate areas of stroke movements and to exclude or mask out the end areas thereof in order to ensure a longer service life of the sensor. Furthermore, these areas can represent irrelevant rest positions of the piston rod.
  • the movement converter is designed concentrically to the axis of rotation of the rotation angle sensor and is coupled to the guide member.
  • the motion transducer can thus be used as a powered sensor element, e.g. function of the sensor shaft of the angle of rotation sensor. This has the advantage that installation space can also be saved in the local area around the cylinder. The mass of the sensor device accelerated by the piston rod is also minimized in this embodiment and thus increases the efficiency of the measuring principle.
  • the sensor device and / or the guide member are arranged to be displaceable in the direction of the linear axis of the piston rod. Due to the displaceability, different stroke areas can be measured with one and the same components of the sensor device. If, for example, only a section in the upper position of the piston rod is of interest, the entire device can be moved into the upper area of the piston rod or the cylinder.
  • the sensor device can be flexibly adapted to varying locations of a cylinder.
  • a device according to the invention is preferred in which the guide member is detachably attached to the piston rod and the sensor device is detachably attached to the cylinder.
  • the guide member has a degree of freedom along the linear axis of the piston rod and thus forms the displaceable element of the device.
  • the angle of rotation sensor and the motion converter are fixedly connected to the cylinder, whereby, for example, vibration influences on the sensor measured values are reduced.
  • the reversible connection between the guide member and the piston rod and the sensor device and the cylinder also makes it easy to replace the measuring device. This is particularly advantageous in the event of a defect in the cylinder and / or the sensor device.
  • the guide member is on the cylinder and the sensor device is on the piston rod releasably attached.
  • the angle of rotation sensor forms the movable part of the device, linear to the piston rod.
  • the guide member is fixedly attached to the cylinder. The reversible connection between the guide member and the cylinder and the sensor device and the piston rod also enables the measuring device to be easily exchanged. This is particularly advantageous in the event of a defect in the cylinder and / or the sensor device.
  • a device according to the invention is preferred in which the motion converter is designed as a toothed wheel and the guide member is designed as a toothed rack. This allows the measurement resolution or accuracy of the measurement device to be adapted by simply varying the translation. This is done, for example, using different gear wheel diameters. In addition, by selecting the number of teeth, further influence can be exerted on the accuracy of the transmission or measurement. In addition, a particularly space-saving measuring device can be implemented through this configuration.
  • a device attached to a pressure cylinder for detecting the stroke height H of a piston rod 2 is shown in Fig. 1 shown.
  • the device comprises a sensor device 3, consisting of a rotation angle sensor 4, a movement converter which is designed as a lever 5, and a guide member 6 with a guide track 7 embedded therein which has at least one end region X1.
  • the sensor device 3 is shown in FIG Fig. 1
  • the preferred embodiment shown is releasably fastened to the cylinder with clamps 9, while the guide member 6 is releasably fastened to the piston rod 2 with a clamping element 8.
  • the arrangement of the sensor device 3 and the guide member 6 can be interchanged so that the sensor device 3 is movably connected to the piston rod 2 and the guide member 6 is fixed in place on the cylinder 1.
  • the preferred detachable forms of attachment serve, on the one hand, to shift the entire device along the cylinder 1 in order to be able to detect a variable stroke range using the device if necessary. On the other hand, this ensures that individual components of the device can be exchanged.
  • the connection between the guide member 6 and the piston rod 2 causes the translational movement F of the piston rod 2 to be transmitted to the guide member 6, so that the piston rod 2 and the guide member 6 are displaced together, the clamping element 8 as a driver for the guide member 6 serves.
  • the angle of rotation sensor 4 detects rotational movements R about its axis of rotation R '.
  • the lever 5 is inserted between the guide member 6 and the rotation angle sensor 4.
  • the lever 5 is mounted rotatably about the axis of rotation R ′ of the angle of rotation sensor 4.
  • the opposite end of the lever 5 is positively enclosed by the guide track 7 and positively guided by it.
  • the conversion of the translational movement F into a rotational movement R can be performed with an alternative Transmission done.
  • the illustrated end area X1 can serve to relieve the lever in an end position of the piston rod 2 and to protect it from sudden accelerations. This increases the durability of the sensor device 3.
  • the lever 5 is designed in such a way that it protrudes into the guide track 7 and is positively guided by the contour of the guide track 7.
  • the contour of the guide track 7 encloses the lever 5, so that the most reliable transmission of the movement is guaranteed.
  • the movement converter can be configured concentrically to the detected axis of rotation R 'of the angle of rotation sensor 4 and thus serve as a sensor shaft, as shown. In this case, a rotational movement R impressed on the movement converter by the guide member 6 would be directly detectable.
  • the motion converter can be designed as a toothed wheel which corresponds to a guide element 6 designed as a toothed rack.
  • a section of the guide track 7 has a non-parallel course to the linear axis F ′ of the piston rod 2.
  • the angle ⁇ enclosed by the relevant section X2 and the linear axis F 'of the piston rod is greater than zero.
  • the size of the included angle ⁇ gives the sensor device 3 a specific transmission ratio with which the deflection of the lever 5 or the signal of the rotation angle sensor 4 can be influenced as a function of the translational movement F of the piston rod 2.
  • the guide track 7 can have several sections at different angles ⁇ to the linear axis F 'of the piston rod 2 in order to resolve individual stroke areas with different levels of precision.
  • Fig. 4 is the forced rotational movement R of the lever 5 about the axis of rotation R 'of the rotation angle sensor 4 with an angle ⁇ 1- ⁇ 3 in the such positions shown.
  • the cylinder 1 with the device is shown in three different positions of the piston rod 2. The amount of the angle ⁇ 1- ⁇ 3 depends on the respective stroke height H of the piston rod and the associated translational movement F in the direction of the linear axis F 'of the piston rod 2.
  • the piston rod 2 With the angle ⁇ 1 according to position 1, the piston rod 2 is in a retracted position, the lever 5 being in the upper position. With the angle a2 according to position 2, the piston rod 2 is in a central position, the lever 5 being moved into the central position by the guide track 7. With the angle ⁇ 3 according to position 3, the piston rod 2 is in an extended position, the lever 5 now being in a lower position.
  • the stroke height H is consequently above the device, i.e. the rotational movement R impressed on the lever 5 from the linear movement F of the guide member 6 with the piston rod 2, in direct connection with the rotational movement R detected by the rotational angle sensor 4.
  • the resulting signal from the rotational angle sensor 4 can therefore be evaluated to determine the lifting height H.

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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)
EP20401010.2A 2019-02-26 2020-02-12 Dispositif de détection de la hauteur de levage d'une tige de piston dans un cylindre Withdrawn EP3702628A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019104768.4A DE102019104768A1 (de) 2019-02-26 2019-02-26 Vorrichtung zur Erfassung der Hubhöhe einer Kolbenstange innerhalb eines Zylinders

Publications (1)

Publication Number Publication Date
EP3702628A1 true EP3702628A1 (fr) 2020-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20401010.2A Withdrawn EP3702628A1 (fr) 2019-02-26 2020-02-12 Dispositif de détection de la hauteur de levage d'une tige de piston dans un cylindre

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EP (1) EP3702628A1 (fr)
DE (1) DE102019104768A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001132709A (ja) * 1999-11-02 2001-05-18 Ckd Corp ポジショナ付き流体圧シリンダ
EP1128074A2 (fr) * 2000-01-21 2001-08-29 Hoerbiger Hydraulik GmbH Actionneur entraíné par un fluide
JP2001263309A (ja) * 2000-03-21 2001-09-26 Ckd Corp ポジショナ付き流体圧シリンダ
EP1070856B1 (fr) 1999-07-19 2005-06-01 CLAAS Industrietechnik GmbH Dispositive de détection de la position d'un piston
DE69929508T2 (de) * 1998-03-23 2006-08-24 Bosch Systèmes de Freinage Partieller Hubsensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69929508T2 (de) * 1998-03-23 2006-08-24 Bosch Systèmes de Freinage Partieller Hubsensor
EP1070856B1 (fr) 1999-07-19 2005-06-01 CLAAS Industrietechnik GmbH Dispositive de détection de la position d'un piston
JP2001132709A (ja) * 1999-11-02 2001-05-18 Ckd Corp ポジショナ付き流体圧シリンダ
EP1128074A2 (fr) * 2000-01-21 2001-08-29 Hoerbiger Hydraulik GmbH Actionneur entraíné par un fluide
JP2001263309A (ja) * 2000-03-21 2001-09-26 Ckd Corp ポジショナ付き流体圧シリンダ

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Publication number Publication date
DE102019104768A1 (de) 2020-08-27

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