DE1807815A1 - Device for travel measurement in a piston-cylinder unit acted upon by a pressure medium - Google Patents
Device for travel measurement in a piston-cylinder unit acted upon by a pressure mediumInfo
- Publication number
- DE1807815A1 DE1807815A1 DE19681807815 DE1807815A DE1807815A1 DE 1807815 A1 DE1807815 A1 DE 1807815A1 DE 19681807815 DE19681807815 DE 19681807815 DE 1807815 A DE1807815 A DE 1807815A DE 1807815 A1 DE1807815 A1 DE 1807815A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- cylinder
- pressure
- pressure medium
- transmitter
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B7/00—Compensating for the effects of temperature
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General 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)
Description
Vorrichtung zur Stellwegmessung bei einer mit einem Druckmedium beaufschlagten Kolben-Zylinder-Einheit Zusatz zu Patent ................ Device for travel measurement when a pressure medium is applied Piston-cylinder unit addendum to patent ................
(Patentanmeldung P 16 23787.9) Die Erfindung geht aus von jenem im Hauptpatent beschriebenen Verfahren sowie einer Vorrichtung zur Stellwegmessung bei einer mit einem Druckmedium beaufschlagten Kolben-Zylinder-Einheit, insbesondere bei Spritzgußmaschinen, unter Verwendung eines elektrischen und/oder magnetischen Meßumformers zur Umformung der Kolbenbewegung in eine elektrische Größe unter Vereinigung folgender Merkmale: a) der bewegbare Kolben ist als der eine Teil des Meßumformers verwendet, b) der andere Teil des Meßumformers ist im Inneren des Zylinders ortsfest an der Zylinderwandung und koaxial zum Kolben angeordnet und ragt in eine im Kolben vorgesehene Bohrung mindestens teilweise hinein. (Patent application P 16 23787.9) The invention is based on that in Main patent described method and a device for travel measurement at a piston-cylinder unit acted upon by a pressure medium, in particular in injection molding machines, using an electric and / or magnetic Transmitter for converting the piston movement into an electrical quantity with unification The following features: a) The movable piston is as the one part of the transmitter used, b) the other part of the transmitter is stationary inside the cylinder arranged on the cylinder wall and coaxially to the piston and protrudes into one in the piston provided hole at least partially into it.
Bei den im Hauptpatent beschriebenen Vorrichtungen liegen sämtliche Teile des Meßumformers im Druckraum des Zylinders.The devices described in the main patent are all Parts of the transmitter in the pressure chamber of the cylinder.
Sie sind hier dem Druck und der hohen Temperatur des Druckmediums ausgesetzt, was sich auf die Lebensdauer und die Meßgenauigkeit des Meßumformers nachteilig auswirken kann.You are here to the pressure and the high temperature of the pressure medium exposed, which affects the service life and measurement accuracy of the transmitter can have a detrimental effect.
Soll die Verstellung des Kolbens im Arbeitszylinder mittels einer elektronischen Regeleinrichtung geregelt werden, so ist es erforderlich, daß die vom Druckmedium beaufschlagten Flächen des Kolbens gleich groß sind und auf der einen Seite des Kolbens die gleiche Ölmenge pro Zeiteinheit zugeführt wird, wie sie auf der nicht vom Druck beaufschlagten Seite abfließt.Should the adjustment of the piston in the working cylinder by means of a electronic control device are controlled, it is necessary that the areas of the piston acted upon by the pressure medium are of the same size and on the one side of the piston is supplied with the same amount of oil per unit of time as it flows off on the side not acted upon by the pressure.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, bei der die genannten Erfordernisse der gleich großen druckbeaufschlagten Flächen beim Kolben erfüllt sind und bei der glethzeitig sämtliche Teile des Meßumformers vom Druckraum des Zylinders getrennt und somit geschützt untergebracht sind.The invention is based on the object of creating a device in which the mentioned requirements of the same size pressurized surfaces with the piston are fulfilled and with the smooth time all parts of the transmitter from the The pressure chamber of the cylinder is housed separately and therefore protected are.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Kolben mit seinem die Bohrung enthaltenden Teil in einen durch eine Zwischenwand vom Zylinderdruckraum abgetrennten druckfreien Raum hineinragt und die Bohrung zur Aufnahme des an der Zylinderwandung ortsfest angebrachten Teils des Meßumformers zum druckfreien Raum hin geöffnet ist.This object is achieved according to the invention in that the piston with its part containing the bore in a through an intermediate wall from the cylinder pressure chamber separated pressure-free space protrudes and the hole for receiving the on the Cylinder wall fixed part of the transmitter to the pressure-free space is open.
Ein Ausführungsbeispiel des Gegenstandes der Erfindung ist im Axialschnitt in der beigefügten Zeichnung dargestellt.An embodiment of the subject matter of the invention is in axial section shown in the accompanying drawing.
Man erkennt einen Kolben 12, der in einem Arbeitszylinder 11 geführt ist. Das Druckmedium wird in den Druckraum 15 des Zylinders durch Einlaßleitungen 23 und 24 eingelassen bzw. abgeführt. Der Druckraum 15 ist mittels Dichtungen 22 und 104 druckfest abgedichtet.A piston 12 can be seen which is guided in a working cylinder 11 is. The pressure medium is in the pressure chamber 15 of the cylinder through inlet lines 23 and 24 let in or removed. The pressure chamber 15 is closed by means of seals 22 and 104 sealed pressure-tight.
Die dargestellte Kolbenstange 12a hat an der anderen, im Ausführungsbeispiel rechten Seite des Kolbens 12 einen Fortsatz 12e gleichen Querschnitts. Dieser ragt durch eine Zwischenwand 105 des Zylinderraumes hindurch in einen druckfreien Raum 101. Zu dessen EntlUftung ist in der Zylinderwand 11 eine Bohrung 102 vorgesehen. Der Kolbenfortsatz 12e weist eine zentrische Sackbohrung 17 auf, in welche ein an der Stirnseite 11a des Zylinders 11 ortsfest angebrachter Teil eines Meßumformers hineinragt. Dieser Teil des Meßumformers weist einen vorzugsweise aus hochpermeablem Material bestehenden Kern 35 auf, der im Bereich der Bohrung des Endteils 11a des Zylinders 11 von einer Spule 34 umgeben ist und an welche sich in Längsrichtung eine weitere Spule 33 unmittelbar anschließt, die den übrigen Teil des Spulenkerns 35 umgibt. Der Kolben 12 und die Kolbenstange 12a mit dem Fortsatz 12e bestehen aus magnetischem, vorzugsweise ferromagnetischem Material. Stattdessen kann die Sackbohrung 17 mit magnetischem Material ausgekleidet seinO Die Spulen 33 und 34 sind zur Kompensation von Temperatureinflüssen zweckmäßig gegenläufig gewickelt.The piston rod 12a shown has on the other, in the exemplary embodiment right side of the piston 12 an extension 12e of the same cross-section. This one protrudes through an intermediate wall 105 of the cylinder space into a pressure-free space 101. A bore 102 is provided in the cylinder wall 11 for its ventilation. The piston extension 12e has a central blind hole 17 into which a the end face 11a of the cylinder 11 fixedly attached part of a measuring transducer protrudes. This part of the transducer preferably has a highly permeable Material existing core 35, which is in the region of the bore of the end portion 11a of the Cylinder 11 is surrounded by a coil 34 and on which in Longitudinal direction a further coil 33 is immediately connected, which forms the remaining part of the coil core 35 surrounds. The piston 12 and the piston rod 12a with the extension 12e exist made of magnetic, preferably ferromagnetic material. Instead, the Blind hole 17 must be lined with magnetic material O The coils 33 and 34 are expediently wound in opposite directions to compensate for temperature influences.
Die vom Druckmedium beaufschlagten Flächen 12b und 12c des Kolbens 12 sind bei diesem Ausführungsbeispiel gleich groß, wodurch eine exakte Regelung der Positionierung des Arbeitskolbens möglich ist.The surfaces 12b and 12c of the piston acted upon by the pressure medium 12 are of the same size in this exemplary embodiment, which enables precise regulation the positioning of the working piston is possible.
Bei einer Verstellung des Kolbens 12 und der Kolbenstange 12a, 12e im Arbeitszylinder 11 erfolgt eine Induktion in den Spulen 33, 34, wobei jeder axialen Lage des kolbens ein bestimmter, von den Spulen abgenommener elektrischer Wert entspricht. Die elektrischen Meßwerte werden über einen Stecker 28 einem elektrischen Schaltgerät 20 zugeführt.When the piston 12 and the piston rod 12a, 12e are adjusted In the working cylinder 11 there is an induction in the coils 33, 34, each being axial The position of the piston corresponds to a specific electrical value taken from the coils. The electrical measured values are transmitted to an electrical switching device via a plug 28 20 supplied.
Es ist ersichtlich, daß die elektrischen Teile des Meßumformers durch die beschriebene Anordnung geschützt untergebracht sind, da sie sich vollkommen in dem druckfreien Raum 101 befinden, wo sie nicht der Temperatur und dem Druck des Druckmediums ausgesetzt sind.It can be seen that the electrical parts of the transmitter go through the arrangement described are housed protected, as they are perfectly located in the unpressurized space 101, where they do not have the temperature and pressure exposed to the media.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681807815 DE1807815A1 (en) | 1967-12-30 | 1968-11-08 | Device for travel measurement in a piston-cylinder unit acted upon by a pressure medium |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1623787 | 1967-12-30 | ||
| DE19681807815 DE1807815A1 (en) | 1967-12-30 | 1968-11-08 | Device for travel measurement in a piston-cylinder unit acted upon by a pressure medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1807815A1 true DE1807815A1 (en) | 1970-05-27 |
Family
ID=33512140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19681807815 Pending DE1807815A1 (en) | 1967-12-30 | 1968-11-08 | Device for travel measurement in a piston-cylinder unit acted upon by a pressure medium |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1807815A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2830981A1 (en) * | 1978-07-14 | 1980-01-31 | Ags Aufbauten Ges Siegerland M | Rear collision protection for light truck - involves pivoted sprung frame secured to chassis |
| DE3149516A1 (en) * | 1981-12-14 | 1983-07-07 | Wabco Steuerungstechnik GmbH & Co, 3000 Hannover | Device for detecting the piston position of a cylinder |
| EP0166521A1 (en) * | 1984-05-21 | 1986-01-02 | Sacol Powerline Limited | Inductive transducers |
| EP0198323A2 (en) * | 1985-04-19 | 1986-10-22 | SANDRETTO INDUSTRIE S.p.A. | A plastics material injection device |
-
1968
- 1968-11-08 DE DE19681807815 patent/DE1807815A1/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2830981A1 (en) * | 1978-07-14 | 1980-01-31 | Ags Aufbauten Ges Siegerland M | Rear collision protection for light truck - involves pivoted sprung frame secured to chassis |
| DE3149516A1 (en) * | 1981-12-14 | 1983-07-07 | Wabco Steuerungstechnik GmbH & Co, 3000 Hannover | Device for detecting the piston position of a cylinder |
| EP0166521A1 (en) * | 1984-05-21 | 1986-01-02 | Sacol Powerline Limited | Inductive transducers |
| US4855675A (en) * | 1984-05-21 | 1989-08-08 | Sacol Powerline Limited | Inductive transducers for indicating establishment of a preselected spatial relationship between two parts |
| EP0198323A2 (en) * | 1985-04-19 | 1986-10-22 | SANDRETTO INDUSTRIE S.p.A. | A plastics material injection device |
| EP0198323A3 (en) * | 1985-04-19 | 1987-08-19 | SANDRETTO INDUSTRIE S.p.A. | A plastics material injection device |
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