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EP1070856B1 - Dispositive de détection de la position d'un piston - Google Patents

Dispositive de détection de la position d'un piston Download PDF

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Publication number
EP1070856B1
EP1070856B1 EP00114195A EP00114195A EP1070856B1 EP 1070856 B1 EP1070856 B1 EP 1070856B1 EP 00114195 A EP00114195 A EP 00114195A EP 00114195 A EP00114195 A EP 00114195A EP 1070856 B1 EP1070856 B1 EP 1070856B1
Authority
EP
European Patent Office
Prior art keywords
measuring bar
sensor
measuring rod
sensor element
cylinder
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 - Lifetime
Application number
EP00114195A
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German (de)
English (en)
Other versions
EP1070856A1 (fr
Inventor
Herbert Kleine
Stephan Berkemann
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.)
Claas Industrietechnik GmbH
Original Assignee
Claas Industrietechnik 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 Claas Industrietechnik GmbH filed Critical Claas Industrietechnik GmbH
Priority to DK00114195T priority Critical patent/DK1070856T3/da
Publication of EP1070856A1 publication Critical patent/EP1070856A1/fr
Application granted granted Critical
Publication of EP1070856B1 publication Critical patent/EP1070856B1/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
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2823—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT by a screw mechanism attached to the piston

Definitions

  • the invention relates to a device for detecting the position of a piston in a cylinder, in particular a pressure medium cylinder, with a bore having a piston rod, in which a measuring rod is arranged, wherein in dependence on the longitudinal movement the piston rod, the measuring rod forced by a rotation angle and the Rotation angle converted by means of a sensor device into an electrical sensor signal becomes.
  • a sensor device for detecting the position of a piston in a cylinder under pressure known to attach a sensor device to an outer circumferential surface of the cylinder tube.
  • This sensor device acts with a within the cylinder on a peripheral surface the piston mounted permanent magnet together.
  • the thus obtained switching signal can in one Downstream electronic evaluation unit for detecting the position of the piston in evaluated the cylinder.
  • a disadvantage of the known device is that of Cylinder due to the attachment of the sensor element on the outside of the cylinder tube Has unwanted projections, the cylinder to an asymmetric Surface contour gives and on the other hand requires a larger radial space.
  • the electrical leads connected to the sensor device must be in the environment be led to a central evaluation unit.
  • a sensor device with magnetic field sensitive Sensors in axial extension to a its location to be detected cylindrical part to arrange.
  • the known part to be detected is However, it is a steering shaft of a steering wheel for motor vehicles, in which the Rotation angle of the same should be detected.
  • this known sensor device is only suitable for detecting the rotation of an elongate member. The capture the axial position of a particular piston is known from this known device not removable.
  • Object of the present invention is therefore to provide a device for detecting the position of a piston in a cylinder in such a way that the position of the piston to simple Way and can be reliably detected, where possible, the known deficiencies resolved should be.
  • the invention in conjunction with the preamble of the claim 1 characterized in that the sensor device at least one fixed Sensor element outside the pressure medium range and a movable, of the Measuring rod driven, sensor element has within the pressure medium range and the movement of the driven sensor element contactless from the fixed Sensor element is detected.
  • the particular advantage of the invention is that a simple measuring system is formed by the formation of the sensor device, which determines the relative position of the piston rod to the cylinder housing. Particularly advantageous is the non-contact determination of the rotational movement of the measuring rod. This eliminates complex rotary feedthroughs, which lead to a reduction of costs and at the same time to new fields of application for the measuring system according to the invention.
  • the stationary sensor element outside the pressure medium range, this can be made particularly simple by no special requirements related to the pressure medium and the pressure in the pressure medium must be made to the execution. Only the environmental conditions, such as moisture and dust protection outside of the lifting cylinder must be taken into account in the design of the sensor element.
  • the sensor device in an edge region of a pressurized space, has the advantage that the required space of the lifting cylinder is not increased. Furthermore, a sensor device can easily be introduced into the lifting cylinder bottom. There is usually, for holding the cylinder, structurally unnecessary housing material into which the sensor device can be easily integrated without changing the function or the size of the lift cylinder. Also, this installation position prevents damage to the sensor device from the outside. Due to this mounting position on the cylinder bottom side, the accessibility to the sensor device is also made easy by not having to dismantle the lifting cylinder for mounting or checking the device. For the non-contact transmission of the rotational movement of the measuring rod to the stationary sensor element, known as operating, for example, according to the magnetic, inductive or capacitive measuring principle sensor devices are available.
  • the movable sensor element can be designed according to the measuring principle used and the movement of the measuring rod can be converted depending on the measuring principle used in a correspondingly recognizable signal. This may be a change in distance between the two sensor elements, a rotation of the elements to each other or even by constructive configurations of the elements with a corresponding movement thereof.
  • a removable sensor housing located in the cylinder bottom a removable sensor housing, which is circumferentially equipped with a seal and on the one hand the fixed sensor element separates from the pressure medium and on the other hand has a recess on the side in communication with the pressure medium side, which for receiving a connected to the front end of the measuring rod connecting element, wherein the connecting element is rotatably mounted about the longitudinal axis of the measuring rod in the recess.
  • the sensor housing is a simple rotary part with a circumferential groove for receiving a seal and provided at both end faces, each with a recess.
  • the sensor element In the recess, on the pressure medium remote side of the sensor housing, can easily attach the fixed sensor element.
  • the sensor element itself can in turn be directly connected to an evaluation electronics and be secured in the recess of the sensor housing directly by means of a potting compound, clamping, pressing or screwing.
  • the sensor housing itself is fixed in a central bore to the measuring rod assembly in the cylinder bottom bore and closes the cylinder bottom against the pressure medium range.
  • On the pressure medium side of the sensor housing a further stepped recess is attached. This serves to fix or support a connecting element, which has a congruent to the recess shape, and is in communication with the measuring rod.
  • the connecting element according to the invention can be further configured by the connecting element is designed for fixing and storage with a ring element, which on the one hand on a shoulder of the cylinder bottom and on the other hand in the recess supported.
  • the connection element is achieved a simple storage and disassembly of the sensor device.
  • Front side becomes the cylinder bottom with a through hole that extends into the pressure medium range, Mistake.
  • Central to this is provided with a larger diameter hole in introduced the cylinder bottom, but not reaching into the pressure medium range.
  • the ring element thereby limits the movement of the connecting element in the direction of the pressure medium range.
  • a movement in the opposite Direction is effected by the adjoining sensor housing.
  • the connecting element has a central bore for receiving the front end of the measuring rod and the measuring rod is connected by means of a transversely to the longitudinal axis of the same extending bolt releasably and hingedly in the bore with the connecting element.
  • This embodiment has the advantage that the measuring rod is decoupled in the axial direction of the connecting element at least in a certain area.
  • the connection element can advantageously be made of a metallic material and the measuring rod made of a non-metal and connect.
  • the standardized sensor elements are adapted to a use case of the pressure medium cylinder adapted Meßstangemother or twisting embodiment.
  • the sensor housing is in a particular embodiment of the invention, on one of Measuring rod remote from the back by means of a holding element releasably connected to the cylinder bottom attached.
  • a holding element releasably connected to the cylinder bottom attached.
  • the sensor element securely fixed in the cylinder bottom but also be removed from there easily.
  • the introduction into the cylinder bottom also allows a reduction in the manufacturing cost of the Hubzylindem used, optionally at the same location, for example, a pressure measuring system or a closure element can be used and fixed by means of the retaining element.
  • the retaining element is advantageously a Seeger ring, which engages in a groove located in the bore of the cylinder base.
  • the movable sensor element as a permanent magnet and the stationary sensor element as magnetic field sensitive Sensor element formed.
  • the movable sensor element is fixed in the with the Measuring rod connected connection element bordered. In cooperation with the established Sensor element of the sensor device, this can be a non-contact measurement achieve the way of the piston rod.
  • a movement of the piston rod is in a rotation of the measuring rod and a corresponding rotational movement of the connecting element transferred. Depending on the arrangement of the permanent magnet in the connection element, this leads Rotational movement at least to a changed orientation of the magnetic field to the fixed Sensor element or at a different distance of the sensor elements to each other.
  • the sensor housing and / or the connecting element made of a non-magnetizable material, such as brass, whereby an improved effect of the measuring principle is achieved.
  • various sensors such as magnetoresistive sensors, Hall sensors and so-called field plates known. Particularly cost-effective prove for the mass use the Hall sensors. These can be easily on a small space requirement integrate an electronic circuit and then with additional evaluation circuits and equip interfaces.
  • the sensor device is at least one permanent magnet aligned in the end portion such that the magnetic axis of the permanent magnet is perpendicular to the longitudinal axis of the measuring rod, and that at least one sensor element in Radial distance is arranged to the permanent magnet within the sensor housing.
  • the connecting element becomes a permanent magnet with the magnetic axis arranged perpendicular to the axis of rotation of the connecting element.
  • At least one magnetic field sensitive Sensor is on the circumference of the connecting element facing side the recess arranged in the sensor housing and is, at least in the position with the smallest distance to one of the pole faces, approximately perpendicular to the magnetic field flows through.
  • two or more magnetic field-sensitive sensors arranged distributed around the circumference of the recess, resulting in a more accurate evaluation the position of the connecting element in the recess is made possible.
  • the decrease of Strength of the magnetic field by a sensor element is simultaneously by an increase in the Strength of the magnetic field detected in the other sensor element.
  • An evaluation electronics evaluates the measured values of the magnetic field-sensitive sensors according to direction and strength of the magnetic field and determines the angle of rotation of the connecting element in the recess.
  • the evaluation electronics may be provided with a microprocessor and memory means and also have an interface that communicates with, for example, a CAN bus system.
  • At least one permanent magnet is so on the Oriented end portion is that the magnetic axis of the permanent magnet radially offset in Direction to the longitudinal axis of the measuring rod, and that at least one sensor element approximately arranged centrally to the longitudinal axis of the measuring rod within the sensor housing are.
  • the permanent magnet can be designed as a bar magnet and directly in a frontal bore on the connection element be arranged. Due to the decentralized arrangement, the direction of the Magnetic field through the centrally arranged, fixed sensor element in a rotation of the connection element in the recess on the sensor housing.
  • the magnetic field can also be generated by a plurality of permanent magnets.
  • the magnetic field sensitive Sensor element is centrally located in the sensor housing and so executed that it can detect the magnetic field direction. This is special cost-effective, as the magnetic field-sensitive sensor easily executed and directly in one Electronic module integrated and so easily connected to other evaluation circuits can be.
  • the design of the measuring rod determines the rotational movement of the connecting element in the recess of the sensor housing. Alone by this design of the measuring rod, the measuring range or the Meßaufains can be specified.
  • the object causing the rotation such as a piston in a cylinder, merely needs to have a bore with an opening cross-section which corresponds to the contour of the measuring rod in cross-section.
  • Particularly advantageous is the execution of the measuring rod with a pitch-large twist of at least 70 °. As a result, long strokes of a piston with a simple and provided with a few twisting measuring rod can be seen. In addition, the friction between the elements is kept low due to the large pitch.
  • the twisting of the measuring rod extends evenly over the entire length of the measuring rod.
  • the twist extends helically essentially along a circumferential angle of 360 °. This makes it easy on Make a clear dependence of the angle of rotation of the measuring rod of the longitudinal movement achieve the piston rod, since the connecting element over the entire stroke the piston experiences only a maximum of one full turn. On a special evaluation and determination of the executed number of revolutions of the measuring rod can according to the invention be waived.
  • the measuring rod can only partially identify a twist.
  • the distance measuring system according to the invention can be limited to the Kolbenhub Colour in which a special evaluation or only there a distance measurement is necessary.
  • the measuring rod is provided for example only in the middle with a twist and designed in the other Meßstangen Suite so that no change in pitch occurs and thus in these Hub Schlen the piston, no rotation of the measuring rod is caused.
  • This embodiment is particularly suitable for executable by the lifting cylinder movements that have a different position from the end stops of the piston, in which the position of the piston must be particularly controlled or regulated or detected. Especially for from a transport in a working position pivoting implements, this embodiment is suitable.
  • the measuring rod has a twist only in the stroke position corresponding to the working position in order, for example, to enable detection there and optionally also a control of the working position.
  • this is provided at least two points with a twist.
  • the measuring rod has areas with different Gradients of twisting.
  • the Meßstange twisting can be to the respective Requirement adapted, be designed differently.
  • the twisting of the measuring rod results in special fields of application and forms, in which otherwise resorted to outside of the cylinder position detection means had to become.
  • These can be relocated according to the invention in the lifting cylinder and thus require no additional space and are also available then Damage protected arranged.
  • Have different slopes of twist the advantage that the measuring rod to the specific requirements along the piston stroke can be adapted.
  • the measuring rod In a further embodiment of the invention, have only the opposite ends the measuring rod on a twist.
  • the measuring rod is designed so that the measuring rod only at the ends have a twist of the rod and in the intervening No distortion of the measuring rod is located.
  • the length of the measuring rod does not extend over the entire stroke of the piston rod. This simplifies the sensor device considerably, since then the bore in the piston rod does not have to be performed over the entire piston stroke. Such embodiments are particularly appropriate when only in the lower, retracted piston position, the position of the piston must be detected. When the measuring rod length exceeds piston stroke, this is then no longer guided by the guide member in the piston head and then stands freely in the cylinder.
  • the Meßstangenende is then provided with a taper in order to ensure the recovery and safe insertion of the measuring rod in the piston bore, the renewed immersion of the piston in the measuring range. It is particularly advantageous if the measuring rod corresponds at least to the full stroke length of the piston rod. A secure guidance of the measuring rod is guaranteed at any time.
  • the guide element at a free end on a radially inwardly oriented resilient nose, which abuts at least partially on the peripheral surface of the measuring rod.
  • This embodiment of the guide element enables a particularly precise guidance of the measuring rod in the bore of the piston rod.
  • the nose is slightly springy on the measuring rod and thus ensures a play-free guidance of the measuring rod. Also wear on the measuring rod or on the guide element are compensated by the guide element itself in a certain range.
  • the nose of the guide element is hook-shaped and equipped with a in the direction of the measuring rod to the peripheral surface thereof the same sealing lip.
  • This hook-shaped embodiment provides a special leadership property of the measuring rod in the bore of the piston rod by also compensating by the snug sealing lip and small distortion of the peripheral surfaces of the measuring rod. Also, it is achieved by the light acting in the axial direction of the measuring rod surface guidance of the hook-shaped nose, a good leadership property at the passages between different slopes of the torsion of the measuring rod.
  • the measuring rod according to the invention can also be further developed by the measuring rod has at least one hook-shaped support member, which the measuring rod partially against the central bore on the peripheral surface of the same fitting supports.
  • This embodiment is suitable according to the invention especially for longer Measuring rod to this in the retracted areas and positions of the piston rod before to protect radial movements.
  • opposite to the connecting element Side of the measuring rod annularly attached a hook-shaped support element.
  • the Measuring rod is carried out a little longer than necessary for the maximum piston stroke, Thus, the guide element and the support member in the extended position of Piston rod does not interfere with each other.
  • the measuring rod is generally of the connecting element held in axiler direction and by the guide element respectively guided in the radial direction of the support element, wherein the support element is designed so that that it has no guide properties based on the measuring rod.
  • This is the support element on the one hand to the outer contour of the measuring rod and the other to the contour designed adapted to the bore in the piston rod.
  • An agricultural tractor 1 shown schematically in FIG. 1 has a front bucket 2 for lifting, transporting and loading goods which can be actuated by means of paired first lifting cylinders 3 and second lifting cylinders 4.
  • the first lifting cylinder 3 serve to raise and lower the Frondladerwing 5 and in conjunction with the blade 2.
  • the second lifting cylinder 4 are used for pivoting the front blade 2 relative to the front loader swing 5.
  • the lifting cylinder 3, 4 are designed as a hydraulic cylinder and substantially similar. For example, the operation of the second lifting cylinder 4 in connection with Figures 2 and 3 will be described in more detail below.
  • the second lifting cylinder 4 are used to adjust the hinged on a front loader swing 5 front bucket 2. At this front loader swing 5 joins to the body of the tractor 1 toward a console 6 for receiving the front loader rocker 5.
  • FIG 1 are each in the upper and lower positions of the front loader rocker fifth different positions of the front blade 2 relative to the front loader rocker 5 shown.
  • the position of the front loader rocker 5 itself to the console 6 and the position of the front bucket 2 relative to the Frondladerschwinge 5, can be in a simpler, inventive Way by a determination of the relative piston positions to the respective cylinder tube. 7 determine.
  • the front blade 2 In a retraction position of the lifting cylinder 4 according to FIG. 2, the front blade 2 is located in a transport position while in a deployed position of the lift cylinder 4 is located in a Auskippositon according to FIG. Own the controls of front loaders usually also an automatic parallel guidance of the front bucket 2 to the footprint of the Agricultural tractors 1. This is done by a controller, depending on the position of the lifting cylinder 3, electrohydraulic automatic one piston position on the two two stroke cylinders 4 set so that the bottom of the front bucket 2 over the entire pivoting the front loader swing 5, from the lower to the upper position, parallel to the base the Acherschleppers 1 is held.
  • the position of the piston in at least one of Lifting cylinder 3 is determined by means of the measuring system according to the invention and to a controller to hand over. This then accesses a stored table on the basis of the measured value and this takes a necessary Hubzylinderwin for the lifting cylinder 4, which a Parallel position of the bottom of the front bucket 2 according to the position of the front loader swing 5 and the stand areas of the tractor 1 corresponds.
  • a subsequent one Control or a control command then causes, based on the determined length signal for the lifting cylinder 4, a corresponding adjustment of the Hubzylinderand the Lifting cylinder 4.
  • the length of at least one lifting cylinder 4 is in turn with an inventive Detected measuring system and reported back to the controller.
  • the lifting cylinder 3 or 4 itself has a cylinder tube 7, in which a piston 8 is longitudinally displaceable is stored.
  • the piston 8 is fixedly connected to a piston rod 9.
  • the piston rod 9 has at a first end face on a hinge eye 10, for example hingedly connected to a blade joint part 11 on the front loader rocker 5.
  • the piston rod 9 has a central bore 12 and on a hinge eye 10 facing away from End of a guide member 45, so that a measuring rod 13 as a measuring element is longitudinally movably guided relative to the piston rod 9.
  • the piston rod 9 is hollow drilled formed and lies with the guide member 45 at least partially peripherally the measuring rod 13 at.
  • the measuring rod 13 has in the illustrated example over the entire length of a slope-sized Torsion 14, which extends along a circumferential angle of 360 ° over the entire length of the measuring rod extends.
  • the measuring rod 13 in cross section rectangular shaped, wherein the edges of the rectangle of each one of the Piston rod 9 facing away from end face 15 to one of the piston rod 9 facing end side 16 continuous and helical (helical) a circumferential angle of Sweep 360 °.
  • FIG. 4 19 Towards the end face 15 of the measuring rod 13, a permanent magnet is shown schematically in FIG. 4 19 in a fixedly connected to the measuring rod 13 connecting element 20 bordered.
  • This connecting element 20 is rotatably in a radial recess 21 of a rotationally fixed stored in the cylinder bottom 18 mounted sensor housing 22.
  • the sensor housing 22 has at least one bore for receiving a sensor element 24, which is at a radial distance from the permanent magnet 19 within the sensor housing 22 is arranged. This supplies depending on the magnetic field of the permanent magnet 19, a sensor signal, which is evaluated in an evaluation and as Wegmeßsignal can be transmitted to a central control unit.
  • the evaluation electronics preferably directly associated with the sensor element 24 and with this together in one Assembly arranged within the sensor housing 22.
  • the sensor housing 22 itself can made of a non-magnetizable material in which the sensor elements 24 is enclosed, exist.
  • the sensor element 24 is operating as a Hall-effect Hall sensor element formed.
  • the cylinder bottom 18 has for articulated mounting of the lifting cylinder 3.4 a joint eye 25 on.
  • this has a first hydraulic connection 27 in the cylinder bottom 18 and a second hydraulic connection 28 in a fixed with the cylinder tube 7 connected cylinder head 29. Through these connections 27, 28 is a hydraulic fluid in the cylinder interior or removed.
  • the piston rod 9 When pressurized of the cylinder 4, the piston rod 9 is moved in the longitudinal direction, wherein the Measuring rod 13 according to the orientation of the twist 14 in a predetermined Direction of rotation 32 is rotated.
  • the sensor device can in the sensor housing also a plurality of uniformly arranged in the circumferential direction sensor elements in an outer ring be arranged of the sensor housing 22.
  • the measuring rod 13 by means of a transverse pin 17 with connected to the connection element 20.
  • the bolt 17 is in a transverse bore of the measuring rod 13 stored.
  • the connecting element 20 is plate-shaped and has a ring element 34, which is supported on a shoulder 35 of the cylinder bottom 18.
  • the connection element 20 has on a measuring rod 13 side facing a recess 36, in the front end 15 of the measuring rod 13 can engage.
  • On one of the measuring rod 13 opposite side joins to the ring member 34, an end portion 37 which together is positioned with the ring member 34 in the cylinder bottom 18.
  • at least one movable sensor element is designed as a permanent magnet 19 arranged.
  • a holding element 38 is provided, by means of which the sensor housing 22 is pressed against the shoulder 35 and the ring member 34 of the connecting element 20 is guided correspondingly low backlash.
  • the holding element 38 is preferably designed as a retaining ring and serves for releasable attachment the sensor housing 22 or the connecting element 20 and the measuring rod 13 inside the cylinder tube 7.
  • the sensor housing 22 is in a groove of a seal 39 which seals the pressure area of the lifting cylinder relative to the environment and between the wall 40 of the cylinder bottom 18 and the sensor housing 22 is pressed is.
  • the sensor housing 22 and the connecting element 20 are preferably made of a metallic Material, in particular brass, within which the sensor element 24 or the permanent magnet 19 are enclosed.
  • the damping pin 41 extends in accordance with 2 end position shown in a constriction portion 42 of the cylinder tube. 7 and allows a hydraulic cushioning of the piston 8 in the retracted position thereof.
  • the guide member 45 frictionally or non-positively used and has a resilient nose 43 which radially inwardly against the measuring rod 13 presses.
  • the nose 43 may be made of a rigid plastic material.
  • the Contour of the guide element 45 corresponds at least in regions to the contour of the It can be polygonal, preferably square, be formed.
  • the guide element 45 is also aligned coaxially with the piston rod 9.
  • Figure 5 shows a measuring rod 13 which is provided over the entire Meßstangenin with a twist. It is shown here in a developed form and can at the ends, depending on the design and application of the measuring rod 13, in addition to guide or holding elements, such as a hole, be equipped. Characterized in that the measuring rod 13 is arranged stationary and a corresponding figure 5 formed distortion 14, the measuring rod 13 is rotated at an axial displacement of the piston 8 and the piston rod 9 about the longitudinal axis of the piston rod 9 by a rotational angle ⁇ , so that a corresponding angle-dependent signal is detected by the sensor device.
  • the twist 14 of the measuring rod 13 has a direction to the longitudinal direction of the measuring rod thirteenth forming pitch angle ⁇ of at least 70 °, preferably 76 °.
  • pitch angle ⁇ should not fall below a drag angle ⁇ of 76 °. hereby is a smooth movement in the relative movement between the measuring rod 13 and the Piston rod 9 ensures, the translational movement of the piston rod 9 friction is converted into a rotational movement of the measuring rod 13, without the To hinder movement of the piston 8.
  • a measuring rod 45 is provided, each having a twist 46 in the region of the front ends.
  • the twists 46 each sweep over a circumferential angle of 180 °, so that over the entire length of the measuring rod 45 there is a twist of 360 ° and thus an unambiguous assignment is given.
  • This measuring rod 45 serves to position the piston rod in an end region thereof.
  • the measuring rod 45 can be used for cushioning.
  • the twisting can also be arranged in any area of the measuring rod 13. The arrangement may be dependent on the use of the piston rod 9 and the piston 8, respectively. The measuring range is therefore determined solely by the shape of the measuring rod.
  • the measuring rod 13 and the piston rod 9 carried out a calibration of the transmitter.
  • These hysteresis errors would be negative especially in direction reversal of the piston rod 9 on the Affect measurement result. Therefore, a reference measurement is performed, in which the piston rod 9 over the entire length in one direction and then in the other direction becomes.
  • a rotation angle characteristic is recorded depending on the path and in the Evaluation electronics stored. After recording this characteristic, the hysteresis error can and the measured sensor value as a function of the direction of movement the piston rod 9 corrected according to the determined hysteresis error become.
  • This calibration process becomes unique after assembly of the sensor device or the measuring rod 13 made in the lifting cylinder 3.4.
  • the measuring rod 13 and the piston rod 9 can each be made of a metallic Material or be formed from a plastic.
  • the guide element 45 can also be made in one piece be connected to a damping pin 41 and has an inwardly deflected Sealing lip 44, which conforms as shown on the guide surfaces of the measuring rod 13.

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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)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Eye Examination Apparatus (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Claims (20)

  1. Dispositif pour détecter la position d'un piston dans un cylindre, en particulier dans un cylindre de vérin à commande par fluide sous pression, comprenant une tige de piston (9) pourvue d'un alésage dans lequel est disposée une tige de mesure, la tige de mesure (13) en fonction du déplacement longitudinal de la tige de piston (9) subissant une rotation forcée d'un angle (ϕ) et l'angle de rotation (ϕ) étant transformé par un système de capteur en un signal de capteur électrique, caractérisé par le fait que le système de capteur comporte au moins un élément de capteur (24) fixe à l'extérieur de la zone à fluide sous pression et un élément de capteur (19) mobile, entraíné par la tige de mesure (13), à l'intérieur de la zone à fluide sous pression et que le déplacement de l'élément de capteur (19) entraíné est détecté sans contacts par l'élément de capteur (24) fixe.
  2. Dispositif selon la revendication 1, caractérisé par le fait que dans le fond (18) du cylindre est disposé un boítier de capteur (22) amovible qui est muni sur son pourtour d'un joint (39) et qui d'une part reçoit en l'isolant vis-à-vis du fluide sous pression l'élément de capteur (24) fixe, et d'autre part présente dans sa face côté fluide sous pression un évidement (21) destiné à recevoir un élément de liaison (20) lié à l'extrémité frontale de la tige de mesure, l'élément de liaison (20) étant monté dans le l'évidement (21) avec possibilité de rotation autour de l'axe longitudinal de la tige de mesure (13).
  3. Dispositif selon une des revendications 1 ou 2, caractérisé par le fait que l'élément de liaison (20) présente un élément annulaire (34) de retenue et de guidage qui prend appui d'un côté sur un épaulement (35) du fond de cylindre (18) et de l'autre dans l'évidement (21).
  4. Dispositif selon une des revendications 1 à 3, caractérisé par le fait que l'élément de liaison (20) comporte un alésage (36) central destiné à recevoir l'extrémité frontale (15) de la tige de mesure (13) et que la tige de mesure (13) est liée de manière séparable et articulée à l'élément de liaison. (20) dans l'alésage (36) par un axe (17) disposé transversalement à l'axe longitudinal de la tige de mesure.
  5. Dispositif selon une des revendications 1 à 4, caractérisé par le fait qu'il est prévu sur une face postérieure du boítier de capteur (22) éloignée de la tige de mesure (13), un élément de retenue (38) pour la fixation démontable du boítier de capteur (22) dans le fond de cylindre (18).
  6. Dispositif selon une des revendications 1 à 5, caractérisé par le fait que l'élément de capteur (19) mobile est conformé en aimant permanent (19) et l'élément de capteur fixe (24) en élément de capteur réagissant aux champs magnétiques.
  7. Dispositif selon une des revendications 1 à 6, caractérisé par le fait que l'élément de capteur fixe (24) est conformé en élément de capteur de Hall
  8. Dispositif selon une des revendications 1 ou 2, caractérisé par le fait qu'au moins aimant permanent (19) est disposé dans la partie d'extrémité (37) de telle sorte que l'axe magnétique de l'aimant permanent (19) soit perpendiculaire à l'axe longitudinal de la tige de mesure (13) et par le fait qu'au moins un élément de capteur (24) est disposé à une certaine distance radiale de l'aimant permanent (19) à l'intérieur du boítie de capteur (22).
  9. Dispositif selon une des revendications 1 à 8, caractérisé par le fait qu'au moins aimant permanent (19) est disposé dans la partie d'extrémité (37) de telle sorte que l'axe magnétique de l'aimant permanent (19) soit décalé radialement en direction de l'axe longitudinal de la tige de mesure (13) et par le fait qu'au moins un élément de capteur (24) est disposé approximativement de manière centrée par rapport à l'axe longitudinal de la tige de mesure (13) à l'intérieur du boítier de capteur (22).
  10. Dispositif selon une des revendications 1 à 9, caractérisé par le fait que la tige de mesure (13) présente une hélice (14) à grand pas, avec un angle de pas (α) dans une zone d'au moins 70°.
  11. Dispositif selon une des revendications 1 à 10, caractérisé par le fait que l'angle de pas (α) est supérieur à un angle de coincement (β) de 76°.
  12. Dispositif selon une des revendications 1 à 11, caractérisé par le fait que l'hélice (14) à grand pas s'étend de manière régulière sur toute la longueur de la tige de mesure (13).
  13. Dispositif selon une des revendications 1 à 12, caractérisé par le fait que l'hélice (14) de la tige de mesure (13) s'étend au maximum sur un angle périphérique de 360°.
  14. Dispositif selon une des revendications 1 à 13, caractérisé par le fait que la tige de mesure (13) présente seulement localement une hélice.
  15. Dispositif selon une des revendications 1 à 14, caractérisé par le fait que la tige de mesure (13) présente des portions avec des pas d'hélice différents.
  16. Dispositif selon une des revendications 1 à 15, caractérisé par le fait que la tige de mesure (13) ne présente une hélice (14) que dans la région d'extrémités (15, 16) en vis-à-vis.
  17. Dispositif selon une des revendications 1 à 16, caractérisé par le fait que la longueur de la tige de mesure (13) ne s'étend pas sur la totalité de la course de la tige de piston (9).
  18. Dispositif selon une, des revendications 1 à 17, caractérisé par le fait que l'élément de guidage (45) à une extrémité libre, présente un doigt (43) élastique orienté radialement vers l'intérieur qui, au moins localement est en contact avec la surface extérieure de la tige de mesure (13).
  19. Dispositif selon une des revendications 1 à 18, caractérisé par le fait que le doigt (43) a une forme de crochet avec une lèvre d'étanchéité (44) qui s'étend en direction de la tige de mesure (13) et s'adapte à la surface extérieure de ladite tige de mesure.
  20. Dispositif selon une des revendications 1 à 19, caractérisé par le fait que la tige de mesure (13) comporte au moins un élément de support en forme de crochet, qui supporte localement en s'adaptant à sa surface périphérique la tige de mesure (13) par rapport à l'alésage central (12).
EP00114195A 1999-07-19 2000-07-14 Dispositive de détection de la position d'un piston Expired - Lifetime EP1070856B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK00114195T DK1070856T3 (da) 1999-07-19 2000-07-14 Indretning til bestemmelse af positionen af et stempel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19933073 1999-07-19
DE19933073A DE19933073A1 (de) 1999-07-19 1999-07-19 Vorrichtung zur Erfassung der Lage eines Kolbens

Publications (2)

Publication Number Publication Date
EP1070856A1 EP1070856A1 (fr) 2001-01-24
EP1070856B1 true EP1070856B1 (fr) 2005-06-01

Family

ID=7914821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00114195A Expired - Lifetime EP1070856B1 (fr) 1999-07-19 2000-07-14 Dispositive de détection de la position d'un piston

Country Status (4)

Country Link
EP (1) EP1070856B1 (fr)
AT (1) ATE296964T1 (fr)
DE (2) DE19933073A1 (fr)
DK (1) DK1070856T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101189559B1 (ko) 2003-10-17 2012-10-11 클라크 이큅먼트 컴파니 유압실린더의 스트로크 위치 센서용 장치 및 설치방법
EP1924746B1 (fr) 2005-09-12 2016-04-27 Wirtgen GmbH Machine de construction automobile avec colonne élévatrice
DE102019104768A1 (de) * 2019-02-26 2020-08-27 Amazonen-Werke H. Dreyer Gmbh & Co. Kg Vorrichtung zur Erfassung der Hubhöhe einer Kolbenstange innerhalb eines Zylinders

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059542A1 (de) * 2000-11-30 2002-06-06 Deere & Co Landwirtschaftliche Maschine oder Gerät mit Positionierungszylinder
DE102006062129B4 (de) 2006-12-22 2010-08-05 Wirtgen Gmbh Straßenbaumaschine sowie Verfahren zur Messung der Frästiefe
AU2011320587B2 (en) * 2010-10-26 2014-12-04 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly
CN114136254B (zh) * 2021-11-01 2024-04-09 庆安集团有限公司 作动器活塞杆可旋转的外置线位移传感器防扭转结构

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DE7201445U (de) * 1972-04-06 Weiste H Langenveranderhcher hydraulischer Stellzylinder
US2936737A (en) * 1955-07-25 1960-05-17 Miller J Carter Rotary actuator
US3403365A (en) * 1964-05-04 1968-09-24 Gen Electric Shielded transducer having means to reduce core movement
NO123671B (fr) * 1968-12-30 1971-12-27 Norsk Hydro Verksteder A S
GB1369673A (en) * 1972-02-07 1974-10-09 Dowty Mining Equipment Ltd Fluid-operated jack with position signalling device
US3956973A (en) * 1972-07-11 1976-05-18 Basic Aluminum Castings Company Die casting machine with piston positioning control
LU66347A1 (fr) * 1972-10-23 1973-01-23
DE2339324A1 (de) * 1973-08-03 1975-02-13 Rexroth Gmbh G L Arbeitszylinder mit stellungsanzeigevorrichtung
FR2216467A1 (fr) * 1973-10-09 1974-08-30 Poclain Sa
GB1526211A (en) * 1976-01-08 1978-09-27 Hydraulics & Pneumatics Ltd Devices for producing signals according to the position of a piston in a cylinder
US4386552A (en) * 1980-06-16 1983-06-07 Foxwell W John Power cylinder with internally mounted position indicator
US4552055A (en) * 1981-02-09 1985-11-12 Prince Manufacturing Company Power cylinder with internally mounted position indicator
DE8516682U1 (de) * 1985-06-07 1987-01-15 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Vorrichtung zur digitalen Wegbestimmung des Kolbenhubes eines Arbeitszylinders von hydraulischem Schreitausbau
US6064197A (en) * 1997-07-26 2000-05-16 U.S. Philips Corporation Angle sensor having lateral magnetic field sensor element and axial magnetic field direction measuring element for determining angular position
DE29820636U1 (de) * 1998-11-18 1999-01-28 Festo AG & Co, 73734 Esslingen Satz aus mehreren Linearantrieben

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101189559B1 (ko) 2003-10-17 2012-10-11 클라크 이큅먼트 컴파니 유압실린더의 스트로크 위치 센서용 장치 및 설치방법
EP1924746B1 (fr) 2005-09-12 2016-04-27 Wirtgen GmbH Machine de construction automobile avec colonne élévatrice
DE102019104768A1 (de) * 2019-02-26 2020-08-27 Amazonen-Werke H. Dreyer Gmbh & Co. Kg Vorrichtung zur Erfassung der Hubhöhe einer Kolbenstange innerhalb eines Zylinders
EP3702628A1 (fr) 2019-02-26 2020-09-02 Amazonen-Werke H. Dreyer GmbH & Co. KG Dispositif de détection de la hauteur de levage d'une tige de piston dans un cylindre

Also Published As

Publication number Publication date
EP1070856A1 (fr) 2001-01-24
DK1070856T3 (da) 2005-10-03
DE50010436D1 (de) 2005-07-07
DE19933073A1 (de) 2001-01-25
ATE296964T1 (de) 2005-06-15

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