WO1996012167A1 - Device for measuring the force of a pressure spring - Google Patents

Device for measuring the force of a pressure spring Download PDF

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Publication number
WO1996012167A1
WO1996012167A1 PCT/DE1995/001349 DE9501349W WO9612167A1 WO 1996012167 A1 WO1996012167 A1 WO 1996012167A1 DE 9501349 W DE9501349 W DE 9501349W WO 9612167 A1 WO9612167 A1 WO 9612167A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
measuring
mandrel
parallel
measuring mandrel
Prior art date
Application number
PCT/DE1995/001349
Other languages
German (de)
French (fr)
Inventor
Gustav Hamberger
Hans-Joachim Wittmann
Gregor MÜNSTERJOHANN
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP95932634A priority Critical patent/EP0786076A1/en
Priority to JP8512834A priority patent/JPH10507265A/en
Publication of WO1996012167A1 publication Critical patent/WO1996012167A1/en

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/34—Spacer grids
    • G21C3/3424—Fabrication of spacer grids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a device for measuring the Feder ⁇ force of a compression spring, which is arranged laterally in a mesh of a lattice-shaped spacer, with an elongated measuring mandrel and a laterally located on the measuring mandrel contact body for the compression spring, which is transverse to the longitudinal axis of the Measuring mandrel is movable in a plane of movement containing the longitudinal axis of the measuring mandrel and is coupled to a measuring spring, which is associated with a device for registering a change in a local geometric spring dimension.
  • the measuring spring with which the contact body for the compression spring of the spacer is coupled, is a leaf spring which has only a single measuring spring bar.
  • This measuring spring bar is rigidly attached to the measuring mandrel with one bar end.
  • the other end of the bar of the measuring spring bar which carries the contact body for the compression spring, bends accordingly when measuring the spring force of the compression spring in the plane of movement.
  • the investment body not only changes its position, but also its position
  • the object of the invention is to improve the known device by avoiding such measurement inaccuracies.
  • a device of the type mentioned at the outset is characterized in that the measuring spring is a parallel spring with at least two separate spring bars arranged side by side in the plane of movement of the contact body and rigid at both ends of the measuring spring are connected to each other, and that this parallel spring is rigidly held on the measuring mandrel at a first measuring spring end and is rigidly connected to the contact body at the second measuring spring end.
  • Claims 2 to 9 are directed to advantageous further developments of the device according to claim 1.
  • the path can be set that the contact body takes in the plane of movement under the action of a predetermined spring force of the compression spring of the lattice-shaped spacer.
  • FIG. 1 shows in longitudinal section the measuring mandrel of a device according to the invention.
  • FIG. 2 shows a longitudinal section through part of a modified measuring mandrel.
  • FIG. 1 shows an elongated measuring mandrel 2 which has a tubular housing 3.
  • a transition sleeve 4 engages in this tubular housing 3, which is attached to an annular shoulder 4a Sleeve end of this transition sleeve 4 is welded.
  • a plug 5 is screwed into the other end of the sleeve and has a central passage 6 in the longitudinal direction of the plug 5 and thus also of the tubular housing 3.
  • a cylindrical bearing sleeve 7 is firmly inserted between the plug 5 and the tubular housing 3.
  • An elongated parallel spring as measuring spring 8 has two elongated spring bars 9 and 10, which have a semicircular cross section in their central part. These spring bars 9 and 10 are arranged side by side in the plane of the drawing so that the central parts of these spring bars 9 and 10 are spaced apart from one another with flat sides located opposite one another.
  • the two ends of the spring bars 9 and 10 located next to one another merge into a one-piece plug 11, which is located in the tubular housing 3 and is welded to this tubular housing 3.
  • the ends of the two spring bars 9 and 10 are rigidly connected to one another at the upper end of the tubular housing 3 of the measuring mandrel 2.
  • the other two ends of the cantilevers 9 and 10 also merge into a one-piece plug 12, so that these two ends of the cantilevers 9 and 10 are also rigidly connected to one another by this plug 12 at the other end of the measuring spring.
  • the plug 12 is loosely arranged in the tubular housing 3 with play.
  • a flat contact body 13 on the side of the stopper 12, which engages with play through a side window 14 in the tubular housing 3 of the measuring mandrel 2 to the outside.
  • This contact body 13 can be displaced at right angles to the longitudinal axis 15 of the measuring mandrel 2 in the plane of the drawing.
  • the plane of the drawing is therefore the plane of movement of the contact body 13. In this plane of movement there is not only the longitudinal axis 15 of the measuring mandrel 2, but in this plane of movement the two spring bars 9 and 10 of the parallel spring representing the measuring spring 8 are also spaced apart from one another.
  • the stopper 12 which is movable in the drawing and thus in the measuring plane is at the second measuring spring end of this measuring spring 8 with a See auxiliary spring bar 17, which has the shape of a solid cylinder, is arranged coaxially to the tubular housing 3 and is rigidly attached to the plug 12 and thus to the second measuring spring end of the parallel spring representing the measuring spring 8 with a bar end.
  • auxiliary spring bar 17 which has the shape of a solid cylinder, is arranged coaxially to the tubular housing 3 and is rigidly attached to the plug 12 and thus to the second measuring spring end of the parallel spring representing the measuring spring 8 with a bar end.
  • On the other end of the beam of the auxiliary spring beam 17 there is a ball 18 which is penetrated by this end of the beam in a ball diameter.
  • the auxiliary spring bar 17 engages in the bearing sleeve 7 coaxial with the tubular housing 3, on the inside of which the ball 18 lies loosely but without play.
  • the bar end of the auxiliary spring bar 17 with the ball 18 can thus be displaced in the longitudinal direction of the parallel spring representing the measuring spring 8 and can be pivoted back and forth on the tubular housing 3 and thus on the measuring mandrel 2 in the plane of movement specified by the plane of the drawing.
  • the points of engagement of the three support elements 19 at the suspension end of the measuring mandrel 2 each have an angular distance of 120 ° from one another with respect to the longitudinal axis 15 of the measuring mandrel 2.
  • a guide element 20 can be seen, which has a hollow cylindrical shape arranged vertically above the measuring mandrel 2 and to the tubular housing 3 of the measuring mandrel 2 is a coaxial sleeve.
  • the lower end of the sleeve forming the guide element 20 has an inner surface which tapers conically to the upper end of this guide element 20 and which is adapted to the conically narrowing outer surface at the hanging end of the measuring mandrel 2.
  • the suspension end of the measuring mandrel 2 can thus be coupled to the guide element 20 by a relative movement directed towards one another between the suspension end and the guide element 20 in the longitudinal direction of the measuring mandrel 2. After coupling, the measuring mandrel 2 is guided laterally by the guide element 20.
  • FIG. 1 also shows a grid mesh 21 of a grid-shaped spacer for fuel rods of a nuclear reactor fuel element filled with nuclear fuel.
  • This grid mesh 21 has a square cross section, and the four mesh walls of this grid mesh 21 are formed by four webs of the grid-shaped spacer.
  • the measuring mandrel 2 passes through the grid mesh 21 and on one side of this measuring mandrel 2 there is a compression spring 22 on the outside of the contact body 13 of the measuring mandrel 2.
  • This compression spring 22 is a tongue spring parallel to the longitudinal axis of the measuring mandrel 2, which is attached to one of the mesh walls of the mesh 21.
  • the measuring mandrel 2 is coupled by pushing its suspension end into the guide learning 20 consisting of a sleeve until it stops with this guide element 20. This coupling is maintained by a corresponding pull on the support elements 19 consisting of wire ropes, and the measuring mandrel 2 is lowered with the guide element 20 into the grid mesh 21 until the compression spring 22 at the contact point outside on the contact body 13 bears laterally on the arbor 2.
  • the guide element 20 is then, for example, pneumatically decoupled from the hanging end of the measuring mandrel 2 and vertically upward subtracted so that the measuring mandrel 2 only hangs on the support elements 19 in the mesh 21.
  • the ohmic resistance of the strain gauge 24 is evaluated.
  • This strain gauge 24 is attached laterally to the spring bar 10 of the parallel spring 8 and represents a device for registering a change in a geometric spring dimension of this spring bar 10.
  • the ohmic resistance of the strain gauge 24 corresponds very precisely to the spring force with which the compression spring 22 acts on the contact body 13 of the measuring mandrel 2 supported on the rigid knobs.
  • the modified measuring mandrel according to FIG. 2 differs from the measuring mandrel according to FIG. 1 in particular in that one bar end of the auxiliary spring bar 17 is rigidly held on the bearing sleeve 7.
  • the other end of the beam passes through the ball 18 in a ball diameter and engages in the stopper 12.
  • This stopper 12 is designed as a hollow cylinder which is coaxial with the tubular housing 3 of the measuring mandrel 2 and on the inner surface of which is on the auxiliary spring beam. 17 tight ball 18 loose but without play.
  • Each of the three support elements 19, each consisting of a wire rope, is simultaneously guided through a longitudinal passage 26 in the suspension end of the measuring mandrel 2 and a longitudinal passage 27 in the sleeve of the guide element 20.
  • the measuring mandrel 2 is guided in the guide element 20 in a rotationally oriented manner, can easily be taken care of for the impact of the compression spring 22 on the contact body 13 when the measuring mandrel 2 is lowered into the grid mesh 21 of the grid-shaped spacer.

Abstract

A device for measuring the force of a pressure spring (22) laterally in a mesh (11) of a grid-shaped spacer has a parallel spring as a measuring spring (8) with at least two separate spring arms (9, 10) arranged side by side in the plane of movement of a bearing member (13) for the pressure spring (22). Said spring arms (9, 10) are rigidly joined together at both measuring spring ends. One measuring spring end of this parallel spring is ridigly secured to a measuring pin (2) and the other to the bearing member (13).

Description

Beschreibung description
Vorrichtung zum Messen der Federkraft einer DruckfederDevice for measuring the spring force of a compression spring
Die Erfindung betrifft eine Vorrichtung zum Messen der Feder¬ kraft einer Druckfeder, die seitlich in einer Masche eines gitterför igen Abstandhalters angeordnet ist, mit einem lang¬ gestreckten Meßdorn und einem seitlich am Meßdorn befindli¬ chen Anlagekörper für die Druckfeder, der quer zur Längsachse des Meßdorns in einer die Längsachse des Meßdorns enthalten¬ den Bewegungsebene beweglich ist und mit einer Meßfeder ge¬ koppelt ist, welcher eine Einrichtung zum Registrieren einer Änderung einer lokalen geometrischen Federabmessung zugeord¬ net ist.The invention relates to a device for measuring the Feder¬ force of a compression spring, which is arranged laterally in a mesh of a lattice-shaped spacer, with an elongated measuring mandrel and a laterally located on the measuring mandrel contact body for the compression spring, which is transverse to the longitudinal axis of the Measuring mandrel is movable in a plane of movement containing the longitudinal axis of the measuring mandrel and is coupled to a measuring spring, which is associated with a device for registering a change in a local geometric spring dimension.
Eine derartige Vorrichtung ist aus der US-Patentschrift 4 246 783 bekannt. In dieser Vorrichtung ist die Meßfeder, mit der der Anlagekörper für die Druckfeder des Abstandhal¬ ters gekoppelt ist, eine Blattfeder, die nur einen einzigen Meßfederbalken aufweist. Dieser Meßfederbalken ist mit einem Balkenende starr am Meßdorn befestigt. Das andere Balkenende des Meßfederbalkens, das den Anlagekörper für die Druckfeder trägt, krümmt sich beim Messen der Federkraft der Druckfeder dementsprechend in der Bewegungsebene. Dabei verändert der Anlagekörper nicht nur seine Position, sondern auch seineSuch a device is known from US Pat. No. 4,246,783. In this device the measuring spring, with which the contact body for the compression spring of the spacer is coupled, is a leaf spring which has only a single measuring spring bar. This measuring spring bar is rigidly attached to the measuring mandrel with one bar end. The other end of the bar of the measuring spring bar, which carries the contact body for the compression spring, bends accordingly when measuring the spring force of the compression spring in the plane of movement. The investment body not only changes its position, but also its position
Ausrichtung. Dadurch kann es insbesondere beim Messen größe¬ rer Federkräfte der Druckfeder zu Meßungenauigkeiten kommen.Alignment. This can lead to measurement inaccuracies, especially when measuring larger spring forces of the compression spring.
Der Erfindung liegt die Aufgabe zugrunde, die bekannte Vor- richtung zu verbessern, indem solche Meßungenauigkeiten ver¬ mieden werden.The object of the invention is to improve the known device by avoiding such measurement inaccuracies.
Zur Lösung dieser Aufgabe ist eine Vorrichtung der eingangs erwähnten Art erfindungsgemäß dadurch gekennzeichnet, daß die Meßfeder eine Parallelfeder mit mindestens zwei gesonderten, in der Bewegungsebene des Anlagekörpers nebeneinander ange¬ ordneten Federbalken ist, die an beiden Meßfederenden starr miteinander verbunden sind, und daß diese Parallelfeder an einem ersten Meßfederende starr am Meßdorn gehaltert und am zweiten Meßfederende starr mit dem Anlagekörper verbunden is .To achieve this object, a device of the type mentioned at the outset is characterized in that the measuring spring is a parallel spring with at least two separate spring bars arranged side by side in the plane of movement of the contact body and rigid at both ends of the measuring spring are connected to each other, and that this parallel spring is rigidly held on the measuring mandrel at a first measuring spring end and is rigidly connected to the contact body at the second measuring spring end.
Dadurch ist gewährleistet, daß bei einer Bewegung des zweiten Federendes der Parallelfeder in der Bewegungsebene zwar auch die Position des Anlagekörpers, nicht aber seine Ausrichtung verändert wird. Der Anlagekörper behält also seine ursprüng- liehe Ausrichtung quer zur Längsachse des Meßdorns auch dann bei, wenn die zu messende Federkraft der Druckfeder erheblich ist und das zweite Meßfederende der Parallelfeder sich ganz erheblich in der Bewegungsebene verschiebt. Deshalb hängt das Biegemoment der durch die Parallelfeder gebildeten Meßfeder und somit auch die Änderung der lokalen geometrischen Feder¬ abmessungen der Federbalken dieser Meßfeder nur von der zu messenden Federkraft der Druckfeder ab.This ensures that when the second spring end of the parallel spring moves in the plane of movement, the position of the contact body is also changed, but not its orientation. The contact body thus maintains its original orientation transversely to the longitudinal axis of the measuring mandrel even when the spring force of the compression spring to be measured is considerable and the second measuring spring end of the parallel spring moves very considerably in the plane of movement. Therefore, the bending moment of the measuring spring formed by the parallel spring and thus also the change in the local geometric spring dimensions of the spring bars of this measuring spring depend only on the spring force of the compression spring to be measured.
Die Patentansprüche 2 bis 9 sind auf vorteilhafte Weiterbil- düngen der Vorrichtung nach Patentanspruch 1 gerichtet. Ins¬ besondere durch die Weiterbildung nach Patentanspruch 4 kann der Weg eingestellt werden, den der Anlagekörper in der Bewe¬ gungsebene unter der Einwirkung einer vorgegebenen Federkraft der Druckfeder des gittertörmigen Abstandhalters nimmt .Claims 2 to 9 are directed to advantageous further developments of the device according to claim 1. In particular, through the development according to claim 4, the path can be set that the contact body takes in the plane of movement under the action of a predetermined spring force of the compression spring of the lattice-shaped spacer.
Die Erfindung und ihre Vorteile seien anhandder Zeichnung an Ausführungsbeispielen näher erläutert:The invention and its advantages are explained in more detail with reference to the drawing using exemplary embodiments:
FIG 1 zeigt im Längsschnitt den Meßdorn einer erfindungsge- mäßen Vorrichtung.1 shows in longitudinal section the measuring mandrel of a device according to the invention.
FIG 2 zeigt einen Längsschnitt durch einen Teil eines abge¬ wandelten Meßdorns.2 shows a longitudinal section through part of a modified measuring mandrel.
In FIG 1 ist ein langgestreckter Meßdorn 2 erkennbar, der ein rohrförmiges Gehäuse 3 hat. Am Unterende des rohrförmigen Ge¬ häuse 3 greift eine Übergangshülse 4 in dieses rohrförmige Gehäuse 3, das an einer ringförmigen Schulter 4a an einem Hülsenende dieser Übergangshülse 4 angeschweißt ist. Im ande¬ ren Hülsenende ist ein Stopfen 5 eingeschraubt, der eine zen¬ trale Durchführung 6 in Längsrichtung des Stopfens 5 und da¬ mit auch des rohrförmigen Gehäuses 3 hat.1 shows an elongated measuring mandrel 2 which has a tubular housing 3. At the lower end of the tubular housing 3, a transition sleeve 4 engages in this tubular housing 3, which is attached to an annular shoulder 4a Sleeve end of this transition sleeve 4 is welded. A plug 5 is screwed into the other end of the sleeve and has a central passage 6 in the longitudinal direction of the plug 5 and thus also of the tubular housing 3.
In die Übergangshülse 4 ist zwischen dem Stopfen 5 und dem rohrförmigen Gehäuse 3 eine zylindrische Lagerhülse 7 fest eingesetzt.In the transition sleeve 4, a cylindrical bearing sleeve 7 is firmly inserted between the plug 5 and the tubular housing 3.
Eine langgestreckte Parallelfeder als Meßfeder 8 weist zwei langgestreckte Federbalken 9 und 10 auf, die in ihrem zentra¬ len Teil halbkreisförmigen Querschnitt haben. Diese Federbal¬ ken 9 und 10 sind in der Zeichenebene nebeneinander so ange¬ ordnet, daß die zentralen Teile dieser Federbalken 9 und 10 mit sich gegenüber befindlichen flachen Seiten Abstand von¬ einander haben.An elongated parallel spring as measuring spring 8 has two elongated spring bars 9 and 10, which have a semicircular cross section in their central part. These spring bars 9 and 10 are arranged side by side in the plane of the drawing so that the central parts of these spring bars 9 and 10 are spaced apart from one another with flat sides located opposite one another.
Im Oberende des Meßdorns 2 gehen die beiden dort nebeneinan¬ der befindlichen Enden der Federbalken 9 und 10 in einen ein- teiligen Stopfen 11 über, der sich im rohrförmigen Gehäuse 3 befindet und mit diesem rohrförmigen Gehäuse 3 fest ver¬ schweißt ist. Durch diesen Stopfen 11 sind also die Enden der beiden Federbalken 9 und 10 am Oberende des rohrförmigen Ge¬ häuses 3 des Meßdorns 2 miteinander starr verbunden.In the upper end of the measuring mandrel 2, the two ends of the spring bars 9 and 10 located next to one another merge into a one-piece plug 11, which is located in the tubular housing 3 and is welded to this tubular housing 3. By means of this plug 11, the ends of the two spring bars 9 and 10 are rigidly connected to one another at the upper end of the tubular housing 3 of the measuring mandrel 2.
Die anderen beiden Enden der Federbalken 9 und 10 gehen eben¬ falls in einen einteiligen Stopfen 12 über, so daß auch diese beiden Enden der Federbalken 9 und 10 durch diesen Stopfen 12 am anderen Meßfederende starr miteinander verbunden sind.The other two ends of the cantilevers 9 and 10 also merge into a one-piece plug 12, so that these two ends of the cantilevers 9 and 10 are also rigidly connected to one another by this plug 12 at the other end of the measuring spring.
Der Stopfen 12 ist mit Spiel lose im rohrförmigen Gehäuse 3 angeordnet. Seitlich am Stopfen 12 befindet sich ein flacher Anlagekörper 13, der mit Spiel durch ein seitliches Fenster 14 im rohrförmigen Gehäuse 3 des Meßdorns 2 nach außen greift. Dieser Anlagekörper 13 ist rechtwinklig zur Längs¬ achse 15 des Meßdorns 2 in der Zeichenebene verschiebbar. Die Zeichenebene ist also die Bewegungsebene des Anlagekörpers 13. In dieser Bewegungsebene befindet sich nicht nur die Längsachse 15 des Meßdorns 2, sondern in dieser Bewegungsebe¬ ne sind auch die beiden Federbalken 9 und 10 der die Meßfeder 8 darstellenden Parallelfeder mit Abstand nebeneinander ange¬ ordnet.The plug 12 is loosely arranged in the tubular housing 3 with play. There is a flat contact body 13 on the side of the stopper 12, which engages with play through a side window 14 in the tubular housing 3 of the measuring mandrel 2 to the outside. This contact body 13 can be displaced at right angles to the longitudinal axis 15 of the measuring mandrel 2 in the plane of the drawing. The plane of the drawing is therefore the plane of movement of the contact body 13. In this plane of movement there is not only the longitudinal axis 15 of the measuring mandrel 2, but in this plane of movement the two spring bars 9 and 10 of the parallel spring representing the measuring spring 8 are also spaced apart from one another.
Während das erste Meßfederende der die Meßfeder 8 darstellen¬ den Parallelfeder starr am rohrförmigen Gehäuse 3 und damit starr am Meßdorn 2 gehaltert ist, ist der in der Zeichen- und damit in der Meßebene bewegliche Stopfen 12 am zweiten Meßfe¬ derende dieser Meßfeder 8 mit einem Hilfsfederbalken 17 ver¬ sehen, der die Form eines massiven Zylinders hat, koaxial zum rohrförmigen Gehäuse 3 angeordnet und mit einem Balkenende starr am Stopfen 12 und damit am zweiten Meßfederende der die Meßfeder 8 darstellenden Parallelfeder befestigt ist. Auf dem anderen Balkenende des Hilfsfederbalkens 17 sitzt fest eine Kugel 18, die von diesem Balkenende in einem Kugeldurchmesser durchgriffen wird. Mit dieser Kugel 18 greift der Hilfsfeder¬ balken 17 in die zum rohrförmigen Gehäuse 3 koaxiale Lager- hülse 7, an deren Innenseite die Kugel 18 lose, aber spiel¬ frei anliegt. Damit ist das Balkenende des Hilfsfederbalkens 17 mit der Kugel 18 in Längsrichtung der die Meßfeder 8 dar¬ stellenden Parallelfeder verschiebbar und in der durch die Zeichenebene vorgegebenen Bewegungsebene hin und her schwenk- bar am rohrförmigen Gehäuse 3 und damit am Meßdorn 2 geführt.While the first measuring spring end of the parallel spring representing the measuring spring 8 is rigidly held on the tubular housing 3 and thus rigidly on the measuring mandrel 2, the stopper 12 which is movable in the drawing and thus in the measuring plane is at the second measuring spring end of this measuring spring 8 with a See auxiliary spring bar 17, which has the shape of a solid cylinder, is arranged coaxially to the tubular housing 3 and is rigidly attached to the plug 12 and thus to the second measuring spring end of the parallel spring representing the measuring spring 8 with a bar end. On the other end of the beam of the auxiliary spring beam 17 there is a ball 18 which is penetrated by this end of the beam in a ball diameter. With this ball 18, the auxiliary spring bar 17 engages in the bearing sleeve 7 coaxial with the tubular housing 3, on the inside of which the ball 18 lies loosely but without play. The bar end of the auxiliary spring bar 17 with the ball 18 can thus be displaced in the longitudinal direction of the parallel spring representing the measuring spring 8 and can be pivoted back and forth on the tubular housing 3 and thus on the measuring mandrel 2 in the plane of movement specified by the plane of the drawing.
Das Aufhängeende des Meßdorns 2, an dem das erste Meßfeder¬ ende der die Parallelfeder aufweisenden Meßfeder 8 am rohr¬ förmigen Gehäuse 3 und damit am Meßdorn 2 starr gehaltert ist, läuft konisch aus und hängt vertikal an drei Tragelemen¬ ten 19, die Drahtseile sind und daher nur Zugkräfte übertra¬ gen. Die Angriffspunkte der drei Tragelemente 19 am Aufhänge- ende des Meßdorns 2 haben voneinander jeweils einen Winkelab¬ stand von 120° in bezug auf die Längsachse 15 des Meßdorns 2.The suspension end of the measuring mandrel 2, on which the first measuring spring end of the measuring spring 8 having the parallel spring is rigidly held on the tubular housing 3 and thus on the measuring mandrel 2, tapers out and hangs vertically on three carrying elements 19, which are wire cables and therefore only transmit tensile forces. The points of engagement of the three support elements 19 at the suspension end of the measuring mandrel 2 each have an angular distance of 120 ° from one another with respect to the longitudinal axis 15 of the measuring mandrel 2.
In FIG 1 ist noch ein Führungselement 20 erkennbar, das eine vertikal über dem Meßdorn 2 angeordnete hohlzylinderförmige und zum rohrförmigen Gehäuse 3 des Meßdorns 2 koaxiale Hülse ist. Das Unterende der das Führungselement 20 bildenden Hülse hat eine sich konisch zum Oberende dieses Führungselements 20 verjüngende Innenfläche, die der sich konisch verjüngenden Außenfläche am Aufhängeende des Meßdorns 2 angepaßt ist. Das Aufhängeende des Meßdorns 2 ist also an das Führungselernent 20 durch eine aufeinander zugerichtete Relativbewegung zwi¬ schen dem Aufhängeende und dem Führungselernent 20 in Längs¬ richtung des Meßdorns 2 ankoppelbar. Nach dem Ankoppeln ist der Meßdorn 2 durch das Führungselement 20 seitlich geführt.In FIG 1, a guide element 20 can be seen, which has a hollow cylindrical shape arranged vertically above the measuring mandrel 2 and to the tubular housing 3 of the measuring mandrel 2 is a coaxial sleeve. The lower end of the sleeve forming the guide element 20 has an inner surface which tapers conically to the upper end of this guide element 20 and which is adapted to the conically narrowing outer surface at the hanging end of the measuring mandrel 2. The suspension end of the measuring mandrel 2 can thus be coupled to the guide element 20 by a relative movement directed towards one another between the suspension end and the guide element 20 in the longitudinal direction of the measuring mandrel 2. After coupling, the measuring mandrel 2 is guided laterally by the guide element 20.
In FIG 1 ist ferner einer Gittermasche 21 eines gitterförmi- gen Abstandhalters für mit Kernbrennstoff gefüllte Brennstäbe eines Kernreaktorbrennelements erkennbar. Diese Gittermasche 21 hat quadratischen Querschnitt, und die vier Maschenwände dieser Gittermasche 21 sind durch vier Stege des gitterförmi- gen Abstandhalters gebildet.1 also shows a grid mesh 21 of a grid-shaped spacer for fuel rods of a nuclear reactor fuel element filled with nuclear fuel. This grid mesh 21 has a square cross section, and the four mesh walls of this grid mesh 21 are formed by four webs of the grid-shaped spacer.
Der Meßdorn 2 durchgreift die Gittermasche 21. und auf einer Seite dieses Meßdorns 2 liegt eine Druckfeder 22 außen am An¬ lagekörper 13 des Meßdorns 2 an. Diese Druckfeder 22 ist eine zur Längsachse des Meßdorns 2 parallele Zungenfeder, welche an einer der Maschenwände der Masche 21 angebracht ist. Auf der gegenüberliegenden Maschenwand befinden sich zwei starre Anlagenoppen 23, an denen sich der Meßdorn 2 seitlich abstüt¬ zen kann.The measuring mandrel 2 passes through the grid mesh 21 and on one side of this measuring mandrel 2 there is a compression spring 22 on the outside of the contact body 13 of the measuring mandrel 2. This compression spring 22 is a tongue spring parallel to the longitudinal axis of the measuring mandrel 2, which is attached to one of the mesh walls of the mesh 21. On the opposite mesh wall there are two rigid system knobs 23 on which the measuring mandrel 2 can be supported laterally.
Der- Meßdorn 2 wird durch Einschieben seines Aufhängeendes in das aus einer Hülse bestehende Führungselernen 20 bis zum An- schlag mit diesem Führungselement 20 gekoppelt. Diese Kopp¬ lung wird durch entsprechenden Zug an den aus Drahtseilen be¬ stehenden Tragelementen 19 aufrechterhalten, und der Meßdorn 2 wird mit dem Führungselement 20 in die Gittermasche 21 so¬ weit abgesenkt, bis die Druckfeder 22 an der Anlagestelle au- ßen am Anlagekörper 13 seitlich am Meßdorn 2 anliegt. Hierauf wird das Führungselement 20 vom Aufhängeende des Meßdorns 2 beispielsweise pneumatisch abgekoppelt und vertikal nach oben abgezogen, so daß der Meßdorn 2 nur noch an den Tragelementen 19 in der Gittermasche 21 hängt.The measuring mandrel 2 is coupled by pushing its suspension end into the guide learning 20 consisting of a sleeve until it stops with this guide element 20. This coupling is maintained by a corresponding pull on the support elements 19 consisting of wire ropes, and the measuring mandrel 2 is lowered with the guide element 20 into the grid mesh 21 until the compression spring 22 at the contact point outside on the contact body 13 bears laterally on the arbor 2. The guide element 20 is then, for example, pneumatically decoupled from the hanging end of the measuring mandrel 2 and vertically upward subtracted so that the measuring mandrel 2 only hangs on the support elements 19 in the mesh 21.
In diesem Zustand wird der ohmsche Widerstand des Dehnungs- meßstreifens 24 ausgewertet. Dieser Dehnungsmeßstreifen 24 ist seitlich am Federbalken 10 der Parallelfeder 8 angebracht und stellt eine Einrichtung zum Registrieren einer Änderung einer geometrischen Federabmessung dieses Federbalkens 10 dar. Der ohmsche Widerstand des Dehnungsmeßstreifens 24 ent- spricht sehr genau der Federkraft, mit der die Druckfeder 22 auf den Anlagekörper 13 des an den starren Noppen abgestütz¬ ten Meßdorns 2 drückt.In this state, the ohmic resistance of the strain gauge 24 is evaluated. This strain gauge 24 is attached laterally to the spring bar 10 of the parallel spring 8 and represents a device for registering a change in a geometric spring dimension of this spring bar 10. The ohmic resistance of the strain gauge 24 corresponds very precisely to the spring force with which the compression spring 22 acts on the contact body 13 of the measuring mandrel 2 supported on the rigid knobs.
Der abgewandelte Meßdorn entsprechend FIG 2, in der gleiche Teile mit den gleichen Bezugszeichen wie in FIG 1 versehen sind, unterscheidet sich vom Meßdorn nach FIG 1 insbesondere dadurch, daß das eine Balkenende des Hilfsfederbalkens 17 starr an der Lagerhülse 7 gehaltert ist. Das andere Balken¬ ende durchgreift die Kugel 18 in einem Kugeldurchmesser und greift in den Stopfen 12. Dieser Stopfen 12 ist als zum rohr¬ förmigen Gehäuse 3 des Meßdorns 2 koaxialer Hohlzylinder aus¬ gebildet, an dessen Innenfläche die auf dem Hilfsfederbalker. 17 fest sitzende Kugel 18 lose, aber spielfrei anliegt.The modified measuring mandrel according to FIG. 2, in which the same parts are provided with the same reference numerals as in FIG. 1, differs from the measuring mandrel according to FIG. 1 in particular in that one bar end of the auxiliary spring bar 17 is rigidly held on the bearing sleeve 7. The other end of the beam passes through the ball 18 in a ball diameter and engages in the stopper 12. This stopper 12 is designed as a hollow cylinder which is coaxial with the tubular housing 3 of the measuring mandrel 2 and on the inner surface of which is on the auxiliary spring beam. 17 tight ball 18 loose but without play.
Sowohl beim Meßdorn nach FIG 1 als auch beim Meßdorn nach FIG 2 bewegt die von der Druckfeder 22 auf den Anlagekörper 13 ausgeübte Druckkraft diesen Anlagekörper 13 in der durch die Zeichenebene der Figuren 1 und 2 vorgegebenen Bewegungsebene praktisch rechtwinklig zur Längsachse 15 des rohrförmigen Ge- häuses 3 und damit des Meßdorns 2, wodurch Meßungenauigkeiten vermieden werden.Both in the measuring mandrel according to FIG. 1 and in the measuring mandrel according to FIG. 2, the compressive force exerted by the compression spring 22 on the contact body 13 moves this contact body 13 practically at right angles to the longitudinal axis 15 of the tubular housing in the plane of movement specified by the plane of the drawing in FIGS 3 and thus the measuring mandrel 2, whereby measurement inaccuracies are avoided.
Jedes der drei jeweils aus einem Drahtseil bestehenden Trag¬ elemente 19 ist zugleich durch eine Längsdurchführung 26 im Aufhängeende des Meßdorns 2 und eine Längsdurchführung 27 in der Hülse des Führungselements 20 geführt. Dadurch wird der Meßdorn 2 drehorientiert im Führungselement 20 geführt, wo- durch leicht für das Auftreffen der Druckfeder 22 auf dem An¬ lagekörper 13 beim Absenken des Meßdorns 2 in die Gitterma¬ sche 21 des gitterförmigewn Abstandhalters gesorgt werden kann. Each of the three support elements 19, each consisting of a wire rope, is simultaneously guided through a longitudinal passage 26 in the suspension end of the measuring mandrel 2 and a longitudinal passage 27 in the sleeve of the guide element 20. As a result, the measuring mandrel 2 is guided in the guide element 20 in a rotationally oriented manner, can easily be taken care of for the impact of the compression spring 22 on the contact body 13 when the measuring mandrel 2 is lowered into the grid mesh 21 of the grid-shaped spacer.

Claims

Patentansprüche claims
1. Vorrichtung zum Messen der Federkraft einer Druckfeder (22), die seitlich in einer Masche (21) eines gitterförmigen Abstandhalters angeordnet ist, mit einem langgestreckten Meßdorn (2) und einem seitlich am Meßdorn (2) befindlichen Anlagekörper (13) für die Druckfeder (22), der quer zur Längsachse (15) des Meßdorns (2) in einer die Längsachse (14) des Meßdorns (2) enthaltenden Bewegungsebene beweglich und mit einer Meßfeder (8) gekoppelt ist, welcher eine1. Device for measuring the spring force of a compression spring (22), which is arranged laterally in a mesh (21) of a grid-shaped spacer, with an elongated measuring mandrel (2) and a laterally located on the measuring mandrel (2) bearing body (13) for the compression spring (22) which is movable transversely to the longitudinal axis (15) of the measuring mandrel (2) in a plane of movement containing the longitudinal axis (14) of the measuring mandrel (2) and is coupled to a measuring spring (8), which is a
Einrichtung zum Registrieren einer Änderung einer lokalen geometrischen Federabmessung zugeordnet ist, d a d u r c h g e k e n n z e i c h n e t , daß die Meßfeder (8) eine Parallelfeder mit mindestens zwei gesonder- ten, in der Bewegungsebene des Anlagekörpers (13) nebeneinan¬ der angeordneten Federbalken (9, 10) ist, die an beiden Me߬ federenden starr miteinander verbunden sind, und daß diese Parallelfeder an einem ersten Federende starr am Meßdorn (2) gehaltert und am zweiten Meßfederende starr mit dem Anlagekörper (13) verbunden ist.Device for registering a change is assigned to a local geometric spring dimension, characterized in that the measuring spring (8) is a parallel spring with at least two separate spring bars (9, 10) arranged next to one another in the plane of movement of the contact body (13) are rigidly connected to each other at both measuring spring ends, and that this parallel spring is rigidly held on the measuring mandrel (2) at a first spring end and is rigidly connected to the contact body (13) at the second measuring spring end.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Einrichtung zum Registrieren einer Änderung einer geometri- sehen Federabmessung an mindestens einem Federbalken (10) der Parallelfeder angebracht ist.2. Device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the device for registering a change in a geometric spring dimension see is attached to at least one spring bar (10) of the parallel spring.
3. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Einrichtung zum Registrieren einer Änderung einer geometri¬ schen Federabmessung ein Dehnungsmeßstreifen (24) ist.3. Apparatus according to claim 1, so that the device for registering a change in a geometrical spring dimension is a strain gauge (24).
4. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß an dem zweiten Meßfederende, das mit dem Anlagekδrper (13) starr verbunden ist, eine Hilfsfeder mit einer zur Bewegungsebene parallelen Wirkungslinie angreift. 4. The device according to claim 1, characterized in that on the second measuring spring end which is rigidly connected to the contact body (13), an auxiliary spring engages with a line of action parallel to the plane of movement.
5. Vorrichtung nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die Hilfsfeder einen Hilfsfederbalken (17) hat, der mit einem Balkenende starr am zweiten Meßfederende der Parallelfeder befestigt und am anderen Balkenende in Längsrichtung der5. Apparatus according to claim 4, d a d u r c h g e k e n n z e i c h n e t that the auxiliary spring has an auxiliary spring beam (17) which is rigidly attached to the second measuring spring end of the parallel spring with one end of the beam and in the longitudinal direction of the other end of the beam
Parallelfeder verschiebbar und in der Bewegungsebene des An¬ lagekörpers (13) hin und her schwenkbar am Meßdorn (2) ge¬ führt ist.Parallel spring slidably and in the plane of movement of the abutment body (13) back and forth on the measuring mandrel (2).
6. Vorrichtung nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die Hilfsfeder einen Hilfsfederbalken (17) hat, der mit einem Balkenende in Längsrichtung der Parallelfeder verschiebbar und parallel zur Bewegungsebene des Anlagekörpers (13) hin und her schwenkbar am zweiten Meßfederende der Parallelfeder geführt und mit dem anderen Balkenende starr am Meßdorn (2) befestigt ist.6. The device according to claim 4, characterized in that the auxiliary spring has an auxiliary spring beam (17) which is slidable with a beam end in the longitudinal direction of the parallel spring and parallel to the plane of movement of the contact body (13) back and forth on the second measuring spring end of the parallel spring and with the the other end of the bar is rigidly attached to the measuring mandrel (2).
7. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der Meßdorn (2) ein Aufhängeende hat, das an einem nur Zugkräfte übertragenden Tragelement (19) hängt.7. The device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the measuring mandrel (2) has a suspension end that hangs on a support element (19) transmitting only tensile forces.
8. Vorrichtung nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t , daß dem Aufhängeende des Meßdorns (2) ein Führungselement (20) zuge¬ ordnet ist, an das das Aufhängeende durch eine aufeinander zu gerichtete Relativbewegung zwischen Aufhängeende und Füh¬ rungselement (20) in Längsrichtung des Meßdorns (2) zur seit- liehen Führung des Meßdorns (2) ankoppelbar ist.8. The device according to claim 7, characterized in that the suspension end of the measuring mandrel (2) is assigned a guide element (20) to which the suspension end by a relative movement towards the suspension end and Füh¬ guiding element (20) in the longitudinal direction of the measuring mandrel (2) can be coupled for lateral guidance of the measuring mandrel (2).
9. Vorrichtung nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t , daß das Führungseiement (20) den Meßdorn (2) drehorientiert führt. 9. The device according to claim 8, so that the guiding element (20) guides the measuring mandrel (2) in a rotationally oriented manner.
PCT/DE1995/001349 1994-10-14 1995-09-29 Device for measuring the force of a pressure spring WO1996012167A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95932634A EP0786076A1 (en) 1994-10-14 1995-09-29 Device for measuring the force of a pressure spring
JP8512834A JPH10507265A (en) 1994-10-14 1995-09-29 Measuring device for spring force of compression spring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4436853.4 1994-10-14
DE4436853 1994-10-14

Publications (1)

Publication Number Publication Date
WO1996012167A1 true WO1996012167A1 (en) 1996-04-25

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JP (1) JPH10507265A (en)
WO (1) WO1996012167A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10438709B2 (en) * 2015-12-31 2019-10-08 Westinghouse Electric Company Llc Measurement apparatus for determining compressive loading that will be applied to a fuel rod of a pressurized water reactor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2749998A1 (en) * 1977-11-08 1979-05-10 Kraftwerk Union Ag SPRING FORCE MEASURING DEVICE
EP0192138A2 (en) * 1985-02-19 1986-08-27 Westinghouse Electric Corporation Spring-force measuring apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2749998A1 (en) * 1977-11-08 1979-05-10 Kraftwerk Union Ag SPRING FORCE MEASURING DEVICE
EP0192138A2 (en) * 1985-02-19 1986-08-27 Westinghouse Electric Corporation Spring-force measuring apparatus

Also Published As

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EP0786076A1 (en) 1997-07-30
JPH10507265A (en) 1998-07-14

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