EP3919758A1 - Cylindre de travail et capteur de position - Google Patents

Cylindre de travail et capteur de position Download PDF

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Publication number
EP3919758A1
EP3919758A1 EP21000140.0A EP21000140A EP3919758A1 EP 3919758 A1 EP3919758 A1 EP 3919758A1 EP 21000140 A EP21000140 A EP 21000140A EP 3919758 A1 EP3919758 A1 EP 3919758A1
Authority
EP
European Patent Office
Prior art keywords
contact
contact body
base body
spring 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.)
Granted
Application number
EP21000140.0A
Other languages
German (de)
English (en)
Other versions
EP3919758B1 (fr
Inventor
Josef Bueter
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.)
Buemach Engineering International BV
Original Assignee
Buemach Engineering International BV
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 Buemach Engineering International BV filed Critical Buemach Engineering International BV
Publication of EP3919758A1 publication Critical patent/EP3919758A1/fr
Application granted granted Critical
Publication of EP3919758B1 publication Critical patent/EP3919758B1/fr
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Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a particularly hydraulic working cylinder with a position transmitter and a position transmitter.
  • U.S. 5,906,222 A a position detection device for a piston of a hydraulic cylinder.
  • the position detection device has a spring element, an actuating unit with a molded body and a magnetic element, as well as a proximity sensor for detecting the position of the magnetic element.
  • the shaped body is actuated via a cam element which is arranged at one end of the piston and inserted into the closure part in sections.
  • the operating principle is based on a contactless proximity method on an inductive basis.
  • EP 2 878 831 A1 discloses a solution that combines the advantages of a reed switch with a particularly precise mechanical release with at the same time reliable decoupling from the pressure chamber.
  • the piston unit moves a magnet body mechanically in the direction of the reed switch, whereby the switching process occurs.
  • EP 0 620 372 A1 the position detection of a piston in a hydraulic cylinder via a magnetic field sensor. This is activated by a magnet on the piston when the position is reached.
  • EP 0 965 765 A2 a mechanical switch contact. This consists of a first, fixed contact and a second contact that can be moved in relation to this. When the piston reaches a defined position, it moves the movable contact in the direction of the first contact so that the circuit closes and a signal is generated.
  • the object of the invention is to show a working cylinder in which the position of the piston unit can be determined in a structurally simple manner and with high precision and high reliability. Furthermore, it is the object of the invention to provide a structurally simple, precise and at the same time robust position transmitter for determining the piston position of a working cylinder.
  • the working cylinder with position transmitter according to the invention has a cylinder body, a piston unit and a position transmitter as basic components.
  • the cylinder body forms a cylinder interior.
  • the piston unit which has a piston movement space, is arranged therein.
  • the piston unit moves linearly inside the cylinder.
  • the part of the cylinder interior in which the piston unit moves is understood as the piston movement space.
  • the cylinder interior is delimited and closed in a pressure-tight manner at each of its axial ends by a closure part.
  • a pressure medium also referred to below as a medium, is introduced into the cylinder interior.
  • the working cylinder according to the invention formed from these basic components can be in different designs.
  • the working cylinder can be a differential working cylinder, a plunger cylinder, a synchronous cylinder, a telescopic cylinder, a pulling cylinder or also a pneumatic working cylinder.
  • working cylinders are also understood to mean, in particular, storage cylinders, gas spring cylinders and hydraulic shock absorbers.
  • the piston unit can also be in different designs, for example as an assembly of piston and piston rod, but also, for example, as a one-piece plunger.
  • the working cylinder has at least one position transmitter which is arranged on the cylinder body.
  • the position to be detected can in particular be the end positions, but also a certain other position that can be defined by the axial position of the arrangement of the position transmitter. It is also advantageously possible to design a working cylinder according to the invention with several position sensors and thus to detect several positions of the piston unit.
  • the position transmitter has a base body and a contact unit.
  • the inside denotes the direction towards the cylinder interior and the outside denotes the opposite direction facing away from the cylinder interior.
  • the base body has a base body interior which is pressure-connected to the cylinder interior.
  • the interior of the main body is open on one side in the direction of the interior of the cylinder. Open is to be understood as meaning that a Pressure compensation of the pressure medium can take place, so that the cylinder interior and the base body interior form a common pressure chamber.
  • the base body is preferably designed in one piece and as a turned / milled part. This enables efficient production and a particularly robust design.
  • the position transmitter has a contact unit which is electrically isolated from the base body.
  • the contact unit has a contact body which penetrates the base body in a pressure-tight manner.
  • the contact body is preferably designed in a rod-shaped design and arranged in the longitudinal axis of the base body.
  • the contact body has a contact body connection section and a contact body inner section.
  • the contact body connection section is located outside the pressure chamber and is designed in such a way that it serves as a connection point for a signal line to a switching unit.
  • the contact body connection section is preferably designed as a standardized contact pin, so that a standardized plug contact can be plugged in, so that inexpensive and reliable contacting is possible.
  • the contact body inner section forms the end section of the contact body opposite the contact body connection section and is located in the base body interior and thus in the pressure chamber.
  • the contact unit has a molded contact body. This is electrically connected to the contact body and designed to come into physical contact with the piston unit.
  • the touch contact is a mechanical contact and at the same time an electrical contact.
  • the position signal is generated with the electrical contact closure. Based on the known position of the position transmitter, the position of the piston unit at the time the position signal is generated is known.
  • the contact unit also has a spring element.
  • the spring element is designed to apply an inwardly acting force to the molded contact body. The spring element thus resets the position of the shaped contact body, compensates for tolerances in the movement space of the piston unit and provides reliable electrical contact with the piston unit.
  • the working cylinder with position transmitter is designed to assume a starting position and a working position as possible operating states.
  • the spring element In the operating state of the starting position, the spring element is in a relaxed position, the shaped contact body is arranged at least in sections in the piston movement space and the contact body connection section is electrically separated from the piston unit.
  • the piston unit In this operating state, the piston unit is located in the section of the piston movement space that is not detected by the position transmitter. In this state, there is no short to ground or any other electrical short to the piston unit on the contact body connection section.
  • the contact body connection section forms the signal output. In this operating state, no signal can be detected by a control unit.
  • the molded contact body In the operating state of the working position, the molded contact body is in touch contact with the piston unit, the spring element is tensioned and the contact body connection is electrically connected to the piston unit.
  • the piston unit is in the position that is monitored by the position encoder. In this state there is an electrical short between the piston unit and the position unit, which is available as a signal at the signal output.
  • the working cylinder according to the invention with position transmitter has the following advantages in particular.
  • the solution represents a simple and robust possibility of determining the position of the piston unit of a working cylinder.
  • a position signal can be picked up very easily with just one signal line. Additional power supply and signal lines can be omitted. Disturbances due to electromagnetic interference are completely excluded by a short to ground, which means that the correct position signal can be ensured even in difficult environments.
  • the solution has a high level of electromagnetic compatibility and immunity to interference.
  • a switching unit that triggers another event when the position is reached, for example an acoustic signal.
  • Complicated, algorithm-controlled control units are not required, but can optionally be used in addition to complex machines and devices.
  • the particular precision of the position detection is also advantageous, since the signal is immediately available at the moment the piston unit touches the molded contact body. Due to the geometry of the molded contact body and piston unit, the position of the piston unit is precisely defined at the moment of contact.
  • the structurally simple design is particularly advantageous, in particular because of the one-piece base body of the position transmitter.
  • the molded contact body is designed as a sphere. This ensures that the piston unit is frequently passed over the molded contact body with little force and wear. Furthermore, a shaped contour corresponding to the shaped contact body is not required on the piston unit.
  • the base body has a conical end section on the pressure side.
  • the pressure-side end section is the inside end section.
  • the insulating cone-shaped bearing seat is preferably formed from an elastomer. Due to the insulating cone-shaped bearing seat, the ball, as a molded contact body, is electrically reliably separated from the base body by just one component and, at the same time, its range of motion is limited axially in the direction of the inside end section. In the operating state of the starting position, the ball is thus given a fixed positional relationship to the base body and to the movement space of the piston unit.
  • the insulating cone-shaped bearing seat also gives rise to particular structural and manufacturing advantages.
  • the spring element is designed as a metallic spring and connects the contact body and the molded contact body in an electrically conductive manner. It is preferably a spiral spring as a standard component, which is arranged in a force-exerting manner between the contact body inner section of the contact body and the shaped contact body.
  • the spring element thus fulfills a mechanical and an electrical function at the same time.
  • the base body receives an insulating body on its outer end section.
  • the contact body penetrates the insulation body.
  • the spring element braces the insulation body axially against the base body. The spring action of the spring element thus not only defines the position and the space for movement of the molded contact body, but also provides a reliable axial seat for the insulation body.
  • the inner contact body section is designed in the shape of a plate and has an outer support rim.
  • the operating pressure of the working cylinder which is present in the interior of the base body, is additionally used to press the contact body axially outward against the insulation body and thus ensure a secure fit and pressure medium tightness.
  • the invention also relates to a position sensor.
  • the position transmitter according to the invention is designed to be arranged on the cylinder body of a working cylinder, the working cylinder being an axially displaceable piston unit which forms a piston movement space, wherein the piston movement space is arranged in the cylinder interior.
  • the position body has a base body which has a base body interior and is open on one side. This is designed to be pressure-connected to a cylinder interior.
  • the position transmitter has a contact unit which is electrically insulated from the base body.
  • the contact unit has a contact body which penetrates the base body in a pressure-tight manner.
  • the contact unit has a contact body connection section and a contact body inner section.
  • the contact unit has a molded contact body. This is electrically connected to the contact body and designed to come into physical contact with a piston unit.
  • the contact unit also has a spring element. The spring element is preferably arranged between the contact body and the shaped contact body and connects them in an electrically conductive manner.
  • the position transmitter is designed to assume a starting position and a working position as possible operating states.
  • the spring element In the starting position, the spring element is in a relaxed position.
  • the shaped contact body is designed to be arranged at least in sections in the piston movement space.
  • the contact body connection section is designed to be electrically separated from the piston unit in the starting position. In the starting position there is no electrical short.
  • the working position the molded contact body is designed to be in physical contact with the piston unit.
  • the spring element is tensioned and the contact body connection section is electrically connected to the piston unit. An electrical circuit is created to the piston unit. This leads to a position signal so that the position of the piston unit in the piston movement space can be clearly determined at the moment the position signal is generated.
  • the molded contact body is designed as a sphere.
  • the base body has a conical, pressure-side end section.
  • the conical end section receives an insulating conical bearing seat for the contact body.
  • the spring element is designed as a metallic spring and connects the contact body and the shaped contact body in an electrically conductive manner.
  • the base body receives an insulating body on its outer end section.
  • the contact body penetrates the insulation body.
  • the spring element braces the insulation body axially against the base body.
  • the insulation body can be designed in different ways. In particular, the insulation body can also be designed in several parts.
  • the position transmitter has an insulation body made of an elastic material.
  • the insulation body fixes the contact body in a radially and axially form-fitting manner.
  • the insulation body has an axially inwardly directed insulation body ring surface and the base body opposite has an axially outwardly directed base body ring surface on.
  • the elastic insulation body is designed in such a way that it can be inserted into the interior of the base body with elastic radial deformation and, with radial relaxation, the insulation body ring surface is arranged opposite the base body ring surface, so that the insulation body forms a positional relationship axially inwardly in a form-fitting manner through a physical contact between the insulation body ring surface and the base body ring surface the base body is fixed.
  • the Figure 1 shows a sectional view of an embodiment of the working cylinder as a differential working cylinder with position sensor 5.
  • the cylinder body 1 is shown, which is designed as a cylinder tube with two closure parts and forms a cylinder interior 2.
  • the piston unit 3 is axially guided in the cylinder tube and can be linearly displaced to a limited extent by the two closure parts. Due to its linear displaceability, the piston unit 3 forms a piston movement space 4 which is located in the cylinder interior 2.
  • the position transmitter 5, the shaped contact body 12 of which protrudes into the piston movement space 4 is fastened to the cylinder body 1 in the vicinity of the guide closure part.
  • a further position transmitter (without reference number) is arranged in the vicinity of the bottom closure part.
  • the Figure 2 shows in detail the side view of the position indicator 5 as a sectional illustration.
  • the base body 6 forms the central receiving unit for the other components and provides the structural interfaces to the cylinder body 1 and a connector in the form of threaded elements and stop shoulders.
  • the contact unit 7 is fastened in the interior 8 of the base body. There, it is arranged so as to be electrically insulated from the base body. It consists of the contact body 9, designed here as a monolithic rotating body, which enables the connection for a contact plug.
  • the contact body 9 has the contact body connection section 10 at one end and the contact body inner section 11 at the other end.
  • the contact body inner section 11 is designed as a plate-shaped collar attachment.
  • the shaped contact body 12 which also belongs to the contact unit 7, is designed as a ball in the exemplary embodiment and is arranged at the opposite inner end of the base body 6. It is fixed in its position via a spring element 13 and a conical insulating bearing seat 14.
  • the conical insulating bearing seat 14 and the conical end section 15 of the base body 6 ensure that the molded contact body 12 is held in its position.
  • the conical insulating bearing seat 14 is designed as an elastomeric component. It is held in its axial position by the conical end section 15 on the pressure side in an axially form-fitting manner against the spring force of the spring element 13 transmitted by the molded contact body 12.
  • the opening width of the conical insulating bearing seat 14 is slightly smaller than the largest axial cross-sectional area of the shaped contact body 12 in order not to move the shaped contact body 12 out of the desired axial position.
  • the opening width of the conical insulating bearing seat 14 is such Dimensions smaller than the cross-sectional area of the shaped contact body 12, so that it can be axially pressed in when the position transmitter 5 is mounted with elastic deformation of the conical insulating bearing seat 14.
  • the dimensioning of the axially acting force of the spring element 13 and the holding force of the conical insulating bearing seat 14 determined by the material and the geometry are coordinated in such a way that the molded contact body 12 is pressed reliably against the conical insulating bearing seat 14 on the one hand and not through it on the other is pressed out of the base body interior 8.
  • the conical end section 15 and the conical insulating bearing seat 15 are designed in such a way that the materials forming the cone do not expand beyond the elastic limit, so that no irreversible plastic deformation occurs either during assembly or during operation.
  • the spring element is arranged between the contact body 9 and the shaped contact body 12.
  • the spring element 13 is specifically arranged between the contact body inner section 11 and the shaped contact body 12.
  • the spring element 13 fulfills a double function in the exemplary embodiment, on the one hand acting as an electrically conductive connection and on the other hand being a mechanical support element.
  • the spring element 13 which consists of a metallic material, establishes the electrically conductive connection between the molded contact body 12 and the contact body 9.
  • the contact body 9 is fixed in its positional relationship to the base body 6 by the insulating body 16, which is formed from three parts in this exemplary embodiment, and is electrically insulated from the latter and thus from ground. An electrically conductive connection from the molded contact body 12 to the contact body connection section, at the same time insulated from the base body, is thus ensured.
  • the operating pressure in the interior of the working cylinder acts via the plate-shaped contact body inner section 11 on the insulation body 16 and additionally presses it into its seat.
  • the Figure 3 shows an embodiment of the position transmitter, in which the base body 6 and the insulating body 16 are designed to be particularly advantageous.
  • the insulating body 16 which is made of an elastic material in this exemplary embodiment, also fixes the contact body 9 on its plate-shaped inner contact body section 11 in a form-fitting manner both axially outwards and inwards by means of a receiving contour 21.
  • the contact body 9 can thus be inserted into the elastic insulation body 16 in a first work step solely through the elastic deformation of the insulation body 16.
  • the receiving contour 21 has, as from Fig. 3 can be seen, both radial and axial sections which correspond to the shape of the contact body 9.
  • the insulation body 16 has an inwardly directed axial insulation body ring surface 19.
  • the base body 6 has an outwardly directed axial base body ring surface 20.
  • the elastically formed insulation body 16 with pre-assembled contact body 9 can thus be inserted axially into the base body 6 with elastic radial deformation in a further work step until it engages, so that the insulation body ring surface 19 and the base body ring surface 20 are axially opposite one another lie and are in touch. In this way, the insulating body 16 is reliably fixed in a positively locking manner in its positional relationship to the base body 6
  • this advantageous embodiment also makes it possible to use an additional axial locking element, as shown in FIG Fig. 2 is described as shaft circlip 18 to save.
EP21000140.0A 2020-06-02 2021-05-20 Cylindre de travail et capteur de position Active EP3919758B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202020002427.9U DE202020002427U1 (de) 2020-06-02 2020-06-02 Arbeitszylinder und Positionsgeber

Publications (2)

Publication Number Publication Date
EP3919758A1 true EP3919758A1 (fr) 2021-12-08
EP3919758B1 EP3919758B1 (fr) 2024-03-20

Family

ID=76059619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21000140.0A Active EP3919758B1 (fr) 2020-06-02 2021-05-20 Cylindre de travail et capteur de position

Country Status (2)

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EP (1) EP3919758B1 (fr)
DE (2) DE202020002427U1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1410863A (fr) * 1964-10-09 1965-09-10 Maxam Power Ltd Perfectionnements aux moutons et appareils similaires
JPS49123492U (fr) * 1973-02-24 1974-10-23
DE3222688A1 (de) * 1981-06-18 1983-01-05 Parker-Hannifin Corp., 44112 Cleveland, Ohio Druckmittelzylinder mit endpunktschalter
DE3527821A1 (de) * 1985-08-02 1987-02-05 Gammaster Muenchen Produktvere Integrierter endschalter fuer arbeitszylinder
DE4312248C1 (de) * 1993-04-15 1994-06-30 Weber Hydraulik Gmbh Elektrischer Kontaktschalter für Hydraulikzylinder
EP0620372A1 (fr) 1993-04-15 1994-10-19 Hydraulik Techniek Vérin à fluide sous pression
US5906222A (en) 1996-08-07 1999-05-25 General Electric Company Apparatus for detecting position of piston in hydraulic actuator coupled to gate valve
EP0965765A2 (fr) 1998-06-18 1999-12-22 Hoerbiger Hydraulik GmbH Vérin
EP2878831A1 (fr) 2013-11-07 2015-06-03 Bümach Engineering International B.V. Cylindre de travail

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800001899A1 (it) 2018-01-25 2019-07-25 Sprega Matteo Dispositivo per cilindri oleodinamici e simili

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1410863A (fr) * 1964-10-09 1965-09-10 Maxam Power Ltd Perfectionnements aux moutons et appareils similaires
JPS49123492U (fr) * 1973-02-24 1974-10-23
DE3222688A1 (de) * 1981-06-18 1983-01-05 Parker-Hannifin Corp., 44112 Cleveland, Ohio Druckmittelzylinder mit endpunktschalter
DE3527821A1 (de) * 1985-08-02 1987-02-05 Gammaster Muenchen Produktvere Integrierter endschalter fuer arbeitszylinder
DE4312248C1 (de) * 1993-04-15 1994-06-30 Weber Hydraulik Gmbh Elektrischer Kontaktschalter für Hydraulikzylinder
EP0620372A1 (fr) 1993-04-15 1994-10-19 Hydraulik Techniek Vérin à fluide sous pression
US5906222A (en) 1996-08-07 1999-05-25 General Electric Company Apparatus for detecting position of piston in hydraulic actuator coupled to gate valve
EP0965765A2 (fr) 1998-06-18 1999-12-22 Hoerbiger Hydraulik GmbH Vérin
EP2878831A1 (fr) 2013-11-07 2015-06-03 Bümach Engineering International B.V. Cylindre de travail

Also Published As

Publication number Publication date
DE202020002427U1 (de) 2021-09-03
DE102021002734A1 (de) 2021-12-02
EP3919758B1 (fr) 2024-03-20

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