FR2517051A1 - SCREW ELONGATION MEASURING DEVICE - Google Patents

SCREW ELONGATION MEASURING DEVICE Download PDF

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Publication number
FR2517051A1
FR2517051A1 FR8217416A FR8217416A FR2517051A1 FR 2517051 A1 FR2517051 A1 FR 2517051A1 FR 8217416 A FR8217416 A FR 8217416A FR 8217416 A FR8217416 A FR 8217416A FR 2517051 A1 FR2517051 A1 FR 2517051A1
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FR
France
Prior art keywords
screw
magnetic carrier
holder
carrier assembly
measuring
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
Application number
FR8217416A
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French (fr)
Inventor
Jiri Rodig
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.)
CKD Praha DIZ AS
CKD Praha Oborovy Podnik
Original Assignee
CKD Praha DIZ AS
CKD Praha Oborovy Podnik
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 CKD Praha DIZ AS, CKD Praha Oborovy Podnik filed Critical CKD Praha DIZ AS
Publication of FR2517051A1 publication Critical patent/FR2517051A1/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The invention is intended to enable precise measurements with the aid of a dial gauge of the strain of a screw when it is tightened. For this purpose, a feeler pin (3) is arranged in a precise bore (2) on the screw axis and pressed with its lower end in the free end of the screw shank. The surface of the screw head (4) is ground flat with the upper end face of the feeler pin (3), which projects with play through the screw head (4). The screw head has a centre (5) for a holder (6) with an attached dial gauge (7). The magnetic holder (9) of a permanent magnet (10) is rotatably mounted in the holder (6), which is sub-divided by a vertical joint (11) into two magnetically non-conductive halves which are soldered together. A rotary ring (12) which is connected to the magnetic holder (9) by screws (13) is fitted on to the holder (6). The magnetic holder (6) is sealed from above downwards by a cover (15) into which the dial gauge (7) is screwed.

Description

DISPOSITIF DE MESURES D'ELONGATION DES VIS
L'invention concerne un dispositif de mesure d'élongation des vis.SCREW ELONGATION MEASURING DEVICE
The invention relates to a device for measuring the elongation of screws.

Dans les liaisons importantes des parties de machine, une tension fondàmentale du vissage est de rigueur par la tractionexercee sur les vis, qui est indiquée par une grandeur (mesurable) concernant la variation de la longueur des vis. On connait un procédé de mesure de la variation des longueurs des vis au moyen de la grandeur de couple qui résulte du bloquage des vis au moyen de clés à couple de rotation. L'avantage de ce procédé de contrôle de la tension exercée sur les vis est la manipulation sans effort, les désavantages résident dans un manque de précision dans les mesures, dans une récolte de succession de fautes de mesures et dans l'impossibilité d1un après-contrOle du bloquage exact des vis.On connait aussi, un procédé de mesures pour l'élongation des vis qui utilise un petit calibre dans la préparation des vis. In the important connections of the machine parts, a fundamental tension of the screwing is de rigueur by the traction exerted on the screws, which is indicated by a quantity (measurable) concerning the variation of the length of the screws. There is a known method of measuring the variation in the lengths of the screws by means of the quantity of torque which results from the locking of the screws by means of torque wrenches. The advantage of this method of controlling the tension exerted on the screws is the effortless manipulation, the disadvantages lie in a lack of precision in the measurements, in a harvest of succession of measurement errors and in the impossibility of an after Control of the exact blocking of the screws. We also know a measurement process for the elongation of the screws which uses a small gauge in the preparation of the screws.

La vis est pourvue d'une bague à paroi mince étirée avec un peu de jeu sur lâme de la vis, qui est soudée sur une extrémité de l'âme de la vis avec le filet de l'extrémité libre de la vis. La deuxième extrémité de la douille s'identifie à une tige qui pass-e dans la tête de vis à travers une ouverture taraudée longitudinalement à l'amie de la vis (BRD 1 698 627). Le désavantage de cette disposition de la vis réside dans la complication considérable et dans la possibilité de dommage léger. The screw is provided with a thin-walled ring stretched with a little play on the core of the screw, which is welded on one end of the core of the screw with the thread of the free end of the screw. The second end of the socket is identified with a rod which passes through the screw head through an opening tapped longitudinally with the screw friend (BRD 1 698 627). The disadvantage of this arrangement of the screw is the considerable complication and the possibility of slight damage.

On connait aussi un procédé de prépa.  We also know a preparation process.

ration de la vis en utilisant un calibre plus gros destiné à la mesure d'élongation. La vis est perforée en direction de l'axe, de la tête jusqu'au filet de son extrémité libre.screw ration using a larger gauge for elongation measurement. The screw is perforated in the direction of the axis, from the head to the thread of its free end.

Par la mesure de la profondeur d'alésage dans la vis avant et après le bloquage, la mesure d'élongation de la vis ainsi bloquée sera recherchée au moyen d'un fil de fer ou d'une tige. Le désavantage de cette préparation des vis réside dans une faible précision dans la mesure.By measuring the bore depth in the screw before and after blocking, the measure of elongation of the screw thus blocked will be sought using a wire or a rod. The disadvantage of this preparation of the screws lies in a low accuracy in the measurement.

En cas d'une demande de contrôle, il est nécessaire pour chaque vis d'exécuter un dessin.In the event of a control request, it is necessary for each screw to execute a drawing.

Les désavantages cités plus haut sont supprimés dans le dispositif suivant l'invention concernant la mesure de l'élongation des vis, dont le principe réside en ce que la tige de mesure est placée dans l'alésage précis de l'axe de la vis et est bloquée sur son extrémité inférieure à l'extrémité libre de l'âme de la vis. L'extrémité supérieure de la tige est rectifiée (meulée) avec la surface supérieure de la-tête de vis, ou la vis traverse avec du jeu la tête de vis. Un centrage est disposé sur la tête de vis pour la fixation du corps d'ensemble porteur aimanté, comportant un instrument comparateur de mesure.Dans le corps de l'ensemble porteur aimanté qui est séparé en deux moitiés aimantées non conductrices et soudées ensemble au moyen d'un joint passant par un plan perpendiculaire, se trouve pivotant le porte-aimant de l'aimant permanent. The disadvantages mentioned above are eliminated in the device according to the invention concerning the measurement of the elongation of the screws, the principle of which resides in that the measuring rod is placed in the precise bore of the axis of the screw and is locked on its lower end to the free end of the core of the screw. The upper end of the rod is ground (ground) with the upper surface of the screw head, or the screw passes through the screw head with play. A centering is arranged on the head of the screw for fixing the body of the magnetic carrier assembly, comprising a measuring comparator instrument. In the body of the magnetic carrier assembly which is separated into two non-conductive magnetic halves and welded together by means of a joint passing through a perpendicular plane, is pivoted the magnet holder of the permanent magnet.

Sur le corps de l'ensemble porteuraimanté un emerillon relié au porte-aimant est bloqué par des vis traversantes à travers une rainure horizontale dans le corps d'ensemble porteur aimanté. Le corps de l'ensemble porteur--aimanté est fermé de haut entas par un couvercle, dans lequel est vissé un instrument comparateur de mesure. On the body of the magnetic carrier assembly a swivel connected to the magnet holder is blocked by through screws through a horizontal groove in the body of the magnetic carrier assembly. The body of the carrier-magnet assembly is closed from the top by a cover, into which a comparator measurement instrument is screwed.

Par la compression de l'extrémité~ de la tige de mesure interne par un alésage précis de ltextrémité libre de l'amie de la vis et par la-rectifica- tion de la seconde extrémité de cette tige de mesure avec la surface supérieure de la tête de vis, une grande précision de la mesure d'élongation est atteinte par le bloquage dû au comparateur de mesures fixé sur la tête de la vis au-dessus de ensemble porteur aimanté;;
Un exemple de réalisation du dispositif de mesure pour l'élongation de vis est-représenté par la figure 1, où l'on voit une coupe de la vis à mesurer avec l'ensemble porteur-aimanté positionné et un comparateur de mesures, qui passe à travers l'axe de la vis, et en figure 2, une coupe transversale est représentée à travers l'ensemble porteuraimanté qui passe à travers le plan A-A, perpendiculaire à l'axe de la vis.By the compression of the end ~ of the internal measuring rod by a precise bore of the free end of the friend of the screw and by the rectification of the second end of this measuring rod with the upper surface of the screw head, high precision in the elongation measurement is achieved by blocking due to the comparator of measurements fixed on the screw head above the magnetic carrier assembly;
An exemplary embodiment of the measuring device for the elongation of the screw is represented by FIG. 1, where we see a section of the screw to be measured with the carrier-magnet assembly positioned and a comparator of measurements, which passes through the axis of the screw, and in Figure 2, a cross section is shown through the magnetic carrier assembly which passes through the plane AA, perpendicular to the axis of the screw.

La vis à mesurer (1) d'après la figure 1, est pourvue, sur sa longueur totale, d'fun alésage (2) concentrique précis, dans lequel une tige de mesure (3) est placée, ou elle est comprimée sur son extrémité inférieure sur l'extrémité libre de l'âme de la vis (1); pendant que l'extrémité supérieure de la tige de mesure (3), passant à travers la tête (4) de la vis (1) avec-du jeu, est rectifiée à niveau avec la surface supérieure de la tête (4). The measuring screw (1) according to FIG. 1 is provided, over its entire length, with a precise concentric bore (2), in which a measuring rod (3) is placed, or it is compressed on its lower end on the free end of the core of the screw (1); while the upper end of the measuring rod (3), passing through the head (4) of the screw (1) with clearance, is leveled with the upper surface of the head (4).

Sur la tête (4) est disposé un centrage (5) servant à la fixation du corps (6) de l'ensemble porteur'aimanté avec lé comparateur de mesure (7). Dans l'espace creux cylindrique (8), d'après la figure 2, du corps (6) de ensemble porteur-aimanté est placé, tournant, un porte.-aimant (9) de l'aimant permanent (10). Le corps (6) de l'ensemble porteur-aimanté est séparé, dans un plan vertical, par un joint (11) en deux moitiés soudées ensemble aimantées non conductrices, par exemple au moyen de laiton. On the head (4) is disposed a centering (5) used for fixing the body (6) of the magnetic carrier assembly with the measurement comparator (7). In the cylindrical hollow space (8), according to FIG. 2, of the body (6) of the magnet-carrier assembly is placed, rotating, a magnet-holder (9) of the permanent magnet (10). The body (6) of the carrier-magnet assembly is separated, in a vertical plane, by a joint (11) into two halves welded together non-conductive magnet, for example by means of brass.

L'émerillon (12) qui est fixé sur le corps (6) et qui est lié par des vis (13) traversantes au porte-aimant (9) à travers la rainure dans le corps (6), sert au serrage du porte-aimant (9) et ainsi aussi de l'aimant permanent (10) tournant de 900 de la position
I à la position II. Le corps (6) est fermé de haut en bas par un couvercle (15), qui est pourvu en son milieu d'un embout fileté pour le filetage du comparateur de mesure (7) et sa fixation par un écrou de serrage.The swivel (12) which is fixed on the body (6) and which is connected by screws (13) passing through to the magnet holder (9) through the groove in the body (6), serves to tighten the holder. magnet (9) and thus also the permanent magnet (10) rotating by 900 from the position
I at position II. The body (6) is closed from top to bottom by a cover (15), which is provided in the middle with a threaded end for threading the comparator (7) and fixing it with a tightening nut.

Le- procédé de mesures de l'a-longement de la vis à mesurer: (7) est le suivant:
Sur le couvercle (15) du corps (6) de l'ensemble porteur aimanté est vissé le comparateur de mesures, bloqué par l'écrou de serrage (160. Par le centrage à la partie inférieure du corps (6) de l'ensemble porteur aimanté est placée une plaque (non représentée) rectifiée, sur laquelle le comparateur de mesure est étalonné et son contact réglé grâce à l'-émérillon (12), l'aimant permanent (10) est réglé 'dans la position I d'après la figure 2, dans laquelle la figure polaire de liaison de l'aimant permanent (10) court parallèlement au joint du portage (11) dans le corps (6) de l'ensemble porteur aimanté,
Dans cette position, les ligne-s de force de l'aimant permanent (10) situé au-dessus de la tête de vis (4) sont fermées, et l'ensemble porteur aimanté est serré au moyen des corps (6) sur la 'vis (î) à mesurer.The method for measuring the lengthening of the screw to be measured: (7) is as follows:
On the cover (15) of the body (6) of the magnetic carrier assembly is screwed the comparator of measurements, blocked by the tightening nut (160. By the centering at the lower part of the body (6) of the assembly magnetized carrier is placed a rectified plate (not shown), on which the measurement comparator is calibrated and its contact adjusted by means of the swivel (12), the permanent magnet (10) is adjusted 'in position I d' after FIG. 2, in which the polar connection figure of the permanent magnet (10) runs parallel to the carrier seal (11) in the body (6) of the magnetic carrier assembly,
In this position, the lines of force of the permanent magnet (10) located above the screw head (4) are closed, and the magnetic carrier assembly is tightened by means of the bodies (6) on the 'screw (î) to be measured.

Par le serrage de la vis (1) à mesurer au moyen de la clé, l'élongation prescrite de la vis à mesurer (1) s'inscrit sur le comparateur, qui enregistre avec précision l'élongation de la vis à mesurer (1) contre la tige à mesurer. By tightening the screw (1) to be measured with the key, the prescribed elongation of the screw to be measured (1) is registered on the comparator, which accurately records the elongation of the screw to be measured (1 ) against the rod to be measured.

Le dispositif à mesurer l'élongation des vis, selon l'invention, est utile pour mesurer le serrage des vis ou comme contrôle de mesure. En ce qui concerne une vis desserrée sa durée d'élongation occasionnellle est reconnaissable.  The device for measuring the elongation of the screws, according to the invention, is useful for measuring the tightness of the screws or as a measurement control. With regard to a loose screw, its occasional elongation time is recognizable.

Claims (3)

REVENDICATIONS 1- Dispositif pour mesurer l'élonga- tion d'une vis, composé d'une vis à mesurer avec une tige de mesure dont l'extrémité inférieure est liée solidement à l'extrémité libre de l'âme de la vis, et d'un ensemble porteur aimanté comportant un instrument comparateur de mesures, caractérisé en ce que, la tige de mesure est comprimée dans un alésage (2) précis dans l'axe de la vis (1), avec son extrémité inférieure dans l'extrémité libre de l'amie de la vis (1), pendant que, à travers la tête de vis (4) l'extrémité supérieure de la tige de mesure (3) est rectifiée sur cette surface supérieure, laissant du jeu ou sur la tete de vis (4) un centrage (5) pour la fixation du corps (6)'du porteur aimanté est formé pour le comparateur de mesure. 1- Device for measuring the elongation of a screw, composed of a screw to be measured with a measuring rod, the lower end of which is firmly connected to the free end of the core of the screw, and d '' a magnetic carrier assembly comprising a measuring comparator, characterized in that, the measuring rod is compressed in a bore (2) precise in the axis of the screw (1), with its lower end in the free end of the screw friend (1), while, through the screw head (4) the upper end of the measuring rod (3) is rectified on this upper surface, leaving play or on the head of screw (4) a centering (5) for fixing the body (6) 'of the magnetic carrier is formed for the measurement comparator. 2- Dispositif d'après la revendication 1, caractérisé en ce que, dans le corps (6) de l'ensemble porteur aimanté qui est séparé par un joint (11) passant par un plan vertical en deux moitiés soudées ensemble aimantées non conductrices, le porte-aimant (9) de l'aimant permanent (10) est disposé tournant. 2- Device according to claim 1, characterized in that, in the body (6) of the magnetic carrier assembly which is separated by a seal (11) passing through a vertical plane into two halves welded together non-conductive magnet, the magnet holder (9) of the permanent magnet (10) is arranged to rotate. 3- Dispositif selon l'unie -quelconque des revendications 1 et 2, caractérisé en ce que sur le corps (6) de l'ensemble porteur aimanté, un émérillon est bloqué par des vis traversantes à travers une rainure horizontale dans le corps (6) de l'ensemble porteur aimanté ou le corps (6) de l' ensemble porteur aimanté est fermé de haut en bas par un couvercle, dans lequel est vissé un comparateur de mesures.  3- Device according to the united -one of claims 1 and 2, characterized in that on the body (6) of the magnetic carrier assembly, a swivel is blocked by through screws through a horizontal groove in the body (6 ) of the magnetic carrier assembly or the body (6) of the magnetic carrier assembly is closed from top to bottom by a cover, into which a measurement comparator is screwed.
FR8217416A 1981-11-24 1982-10-18 SCREW ELONGATION MEASURING DEVICE Pending FR2517051A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS818626A CS228665B1 (en) 1981-11-24 1981-11-24 Screw elongationmetering apparatus

Publications (1)

Publication Number Publication Date
FR2517051A1 true FR2517051A1 (en) 1983-05-27

Family

ID=5437087

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8217416A Pending FR2517051A1 (en) 1981-11-24 1982-10-18 SCREW ELONGATION MEASURING DEVICE

Country Status (7)

Country Link
CS (1) CS228665B1 (en)
DE (1) DE3243306A1 (en)
DK (1) DK448082A (en)
FI (1) FI823659L (en)
FR (1) FR2517051A1 (en)
NO (1) NO823923L (en)
SE (1) SE8206582L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353292A (en) * 2013-07-29 2013-10-16 北京理工大学 Automatic measurement apparatus for stretching amount of integrated bolt stretcher

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102954752A (en) * 2012-10-26 2013-03-06 西安航空动力控制科技有限公司 Special device for measuring deformation of warming sheet
CN103322893A (en) * 2013-07-03 2013-09-25 国家电网公司 Generator connecting bolt elongation value measuring method, measuring device thereof and use method
DE102014101241A1 (en) 2014-01-31 2015-08-06 Realtest GmbH Device for determining bending stresses of locking elements and method for this purpose

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287286A (en) * 1938-08-13 1942-06-23 Karl Otto Goettsch Magnetic chuck
US2360928A (en) * 1941-02-07 1944-10-24 O S Walker Co Inc Permanent magnet chuck
US2879686A (en) * 1952-10-31 1959-03-31 Ohio Brass Co Anchor bolt having test rod to indicate tension changes
DE1698627A1 (en) * 1968-02-09 1971-08-19 Augsburg Nuernberg Ag Zweignie Device for displaying the tension of expansion screws
US3943819A (en) * 1974-08-22 1976-03-16 Charron Charles S Tensile member with tension indicating means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287286A (en) * 1938-08-13 1942-06-23 Karl Otto Goettsch Magnetic chuck
US2360928A (en) * 1941-02-07 1944-10-24 O S Walker Co Inc Permanent magnet chuck
US2879686A (en) * 1952-10-31 1959-03-31 Ohio Brass Co Anchor bolt having test rod to indicate tension changes
DE1698627A1 (en) * 1968-02-09 1971-08-19 Augsburg Nuernberg Ag Zweignie Device for displaying the tension of expansion screws
US3943819A (en) * 1974-08-22 1976-03-16 Charron Charles S Tensile member with tension indicating means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353292A (en) * 2013-07-29 2013-10-16 北京理工大学 Automatic measurement apparatus for stretching amount of integrated bolt stretcher
CN103353292B (en) * 2013-07-29 2016-02-24 北京理工大学 Overall bolt stretching machine amount of tension self-operated measuring unit

Also Published As

Publication number Publication date
DK448082A (en) 1983-05-25
FI823659A0 (en) 1982-10-26
SE8206582D0 (en) 1982-11-18
CS228665B1 (en) 1984-05-14
FI823659L (en) 1983-05-25
SE8206582L (en) 1983-05-25
NO823923L (en) 1983-05-25
DE3243306A1 (en) 1983-06-09

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