WO1994020830A1 - Tensile force sensor - Google Patents

Tensile force sensor Download PDF

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Publication number
WO1994020830A1
WO1994020830A1 PCT/BE1994/000020 BE9400020W WO9420830A1 WO 1994020830 A1 WO1994020830 A1 WO 1994020830A1 BE 9400020 W BE9400020 W BE 9400020W WO 9420830 A1 WO9420830 A1 WO 9420830A1
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WO
WIPO (PCT)
Prior art keywords
sensor according
arms
switch
micro
cell
Prior art date
Application number
PCT/BE1994/000020
Other languages
French (fr)
Inventor
Fernand Humblet
Original Assignee
Fernand Humblet
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 Fernand Humblet filed Critical Fernand Humblet
Publication of WO1994020830A1 publication Critical patent/WO1994020830A1/en

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Classifications

    • 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
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/047—Specific indicating or recording arrangements, e.g. for remote indication, for indicating overload or underload

Definitions

  • the present invention relates to a traction sensor which may be suitable for measuring a traction force exerted on the device by causing an alarm or another signal, for example a signal limiting the applied traction force.
  • a traction sensor which may be suitable for measuring a traction force exerted on the device by causing an alarm or another signal, for example a signal limiting the applied traction force.
  • Such a device finds its general application in lifting machines and is intended to avoid overloads which can in particular be the cause of accidents due to ruptures.
  • STATE OF THE ART There are a large number of sensors essentially comprising strain gauges providing a signal which is processed by electronic devices.
  • One of the embodiments which offers the advantage of simplicity is constituted by a ring generally of cylindrical shape. When this ring is stressed in longitudinal use, under the effect of the load, it deforms into an ellipse causing a bringing together of the two lateral sides and on which a triggering device has been placed which is very often a simple limit switch.
  • the limit switch contact opens under the effect of the deformation of the ring, producing a signal such as an alarm.
  • This device has many drawbacks, namely: - the limit switch fitted to these sensors is generally a conventional limit switch whose differential stroke is very large, hence the need to have a large dimension ring so as to obtain a deformation of several millimeters. - given that the differential travel is very large, it is sometimes necessary to place a pre-stress on the end of travel, hence a lack of precision and sensitivity of the device.
  • the cut-off threshold must be located close to the nominal load of the ring, resulting in a very limited adjustment and use range.
  • the ring can undergo a permanent deformation which makes it unusable.
  • no lateral support of the traction device is placed on the ring, which can disturb the repeatability of the release for the same load.
  • the limit switch system is in fact exposed to a significant risk of breakage or deterioration resulting from exposures in an industrial or other atmosphere, common for most uses of equipment of this type. .
  • the axes used to apply the tensile force are not maintained, which means that by moving the point of application of the force, the sensor becomes completely inoperative.
  • the object of the present invention is to provide a traction sensor of the mechanical type with micro-switch avoiding the aforementioned drawbacks and which can be connected directly to a management monitor or alternatively and / or in combination, directly integrating an audible and visual alarm.
  • the invention also aims to provide a reliable device resistant to external stresses and having sensitivity and precision high.
  • the invention relates to a traction sensor constituted by a deformation cell of generally annular shape comprising an upper anchoring point and a lower anchoring point perfectly located and connected by two branches. It is characterized by the fact that two arms are mounted substantially perpendicular to the tensile force exerted along the axis connecting the two attachment points, and the lengths of which are such that, as long as the stress limit does not is not reached, the front parts of said arms do not come into contact, and by the fact that the two arms which have sufficient mechanical strength to avoid any permanent deformation of the deformation cell serve respectively as housing for a microswitch and housing to a contact stop, the micro-switch triggering a signal when it comes into contact with the stop.
  • the micro-switch which is housed in one of the arms is of very high precision and the contact stop which is housed in the other arm is preferably a calibration screw with fine pitch and accessible externally by an opening of 'access which could be closed after taring, preferably by a tamper-evident cap.
  • the sensor deformation cell is designed to so as to obtain a deformation of about one millimeter for the nominal load and the differential stroke of the micro ⁇ switch which is fitted with 1 micron, which gives a 5.00 ⁇ Kg sensor a range of 1,000 taring possibilities with a sensitivity of 5 Kg.
  • the microswitch can be connected via a connection plug to a management and recording device which is more generally called a management monitor.
  • the arm in which the micro-switch is housed may include a perforation to allow the passage of wires connecting the micro-switch to a sound or light alarm device.
  • This alarm device is preferably housed in the free space between the branches and the arms. In this case it could include: a printed circuit with electronic components, a buzzer, a "led" (light emission device) signaling and power batteries.
  • FIG. 1 shows an elevation view of a sensor according to the invention representing the essential constituent elements, and comprising a connector for connecting it to a monitor.
  • Figure 2 is similar to Figure 1 but has a perforation for connecting the micro ⁇ switch directly to an alarm device incorporated in the sensor.
  • Figure 3 shows the device of Figure 2 provided with a cover plate which may include identification characteristics.
  • Figure 4 shows a side view of the device of Figure 2 provided with a protective plate on the underside and a plate protection on the upper side so as to place the sensor sandwiched between the two plates.
  • the sensor according to the invention represented in the embodiment of FIG. 1 is an annular deformation cell bearing the general reference 1 which in the particular case represented has the form of a rhombus but which could also affect the shape of an oval.
  • attachment point 11 and a lower attachment point 13 connected by two branches 15 and 17, which constitutes the deformation cell 1.
  • These attachment points 11 and 13 are designed so as to be able to preserve the elasticity of the cell while maintaining in position the pins 19 used to apply the tensile force to the cell.
  • This ring-shaped cell 1 can be integrated into a chain, a sling or a handling strap, but can also be interposed in the fixing of the dead strand on a lifting machine.
  • the sensor will be fixed at 11 to the structure of the carriage or hoist and the dead strand cable will be fixed at 13.
  • the deformation cell is made of possibly stainless steel, aluminum or any similar material. Under the effect of a traction, the ring 1 is deformed while elongating, the branch 15 approaching the branch 17.
  • the tensile force is directed along the axis lines 19 in FIG. 1 and the median plane is represented in axis lines identified by the reference 21.
  • two arms 23 and 25 substantially perpendicular to the direction of the tensile force along the axis 19 are provided.
  • These arms 23 and 25 are of sufficient mechanical strength to avoid any permanent deformation of the ring 1 and they serve as housing for a microswitch 31 of high precision (shown diagrammatically) and housing for a contact stop which is preferably constituted by a setting screw 32.
  • the lengths of the arms 23 and 25 are such that the respective front portions 23A and 25A of the arms 23 and 25 will only come into contact if by accident the nominal load of the ring is greatly exceeded, because the goal is nevertheless thanks to the 'integration of a ring, to avoid exceeding the nominal load.
  • microswitch 31 will switch to the preset value well before the arms 23 and 25 come into frontal contact.
  • the arm 25 is extended using a connector 33 onto which a connection plug (not shown) can be screwed intended for connecting the ring to a management monitor.
  • the ring will have a cut-off function at the preset value.
  • connection plug an outlet for a cable from the arm 25 by a perforation 35 and thus to connect the microswitch 31 to a device d 'audible and / or luminous alarm which can easily be accommodated in the free space between the branches 15 and 17 and the arms 23 and 25.
  • this alarm device comprises: a printed circuit with electronic components, a buzzer 40, a signaling "led” 41 and batteries 42 in order to make it autonomous.
  • the arms 23 and 25 can be provided with holes 38 allowing the fixing of two plates 39 (see FIG. 3).
  • the two plates 39 will have the purpose of:
  • the sensor according to the invention has a limited size and prevents any degradation of the ring 1 while effectively protecting the microswitch 31.
  • the attachment to points 11 and 13 provided for this purpose is carried out using conventional means, such as a corner box for fixing cables, chain adaptation lugs, etc.
  • the sensor according to the invention can be used as a load limiter for a crane, overhead crane or any other lifting or traction means.
  • the shape of the ring is not necessarily that of the rhombus as shown.
  • 1'invention is the presence of arms preventing permanent deformation of the ring and allowing the housing of sensitive elements inside thereof.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

A tensile force sensor consisting of a generally ring-shaped deformation cell (1) comprising an upper attachment point (11) and a lower attachment point (13) linked by two branches (15 and 17). Two arms (23 and 25) are substantially perpendicular to the tensile force exerted along an axis (19) passing through the two attachment points (11 and 13). The lengths of the arms (23 and 25) are selected so that the facing portions (23A and 25B) of the arms do not touch each other until the stress limit has been reached. Said arms (23 and 25) have sufficient mechanical strength to prevent permanent deformation of the deformation cell (1) and respectively house a micro-switch (31) and a contact stop (32) whereby said micro-switch (31) generates a signal when it touches the stop (32).

Description

CAPTEUR DE TRACTION Objet de l'invention La présente invention est relative à un capteur de traction pouvant convenir pour mesurer une force de traction exercée sur le dispositif en provoquant une alarme ou un autre signal, par exemple un signal limitant la force de traction appliquée. Un tel dispositif trouve son application générale dans les engins de levage et est destiné à éviter des surcharges pouvant notamment être la cause d'accidents dus à des ruptures. Etat de la technique II existe un grand nombre de capteurs comportant essentiellement des jauges de contrainte fournissant un signal qui est traité par des dispositifs électroniques. OBJECT OF THE INVENTION The present invention relates to a traction sensor which may be suitable for measuring a traction force exerted on the device by causing an alarm or another signal, for example a signal limiting the applied traction force. Such a device finds its general application in lifting machines and is intended to avoid overloads which can in particular be the cause of accidents due to ruptures. STATE OF THE ART There are a large number of sensors essentially comprising strain gauges providing a signal which is processed by electronic devices.
Le recours à l'électronique est une solution relativement onéreuse et dans certains cas, le dispositif est sensible aux sollicitations extérieures, relativement contraignantes, compte tenu des applications industrielles les plus courantes pour de tels équipements.The use of electronics is a relatively expensive solution and in some cases, the device is sensitive to external stresses, relatively restrictive, given the most common industrial applications for such equipment.
On a donc cherché à réaliser des dispositifs essentiellement mécaniques comportant un fin de course. Une des formes d'exécution qui offre l'avantage de la simplicité est constituée par un anneau généralement de forme cylindrique. Lorsque cet anneau est sollicité en usage longitudinal, sous l'effet de la charge, il se déforme en ellipse en provoquant un rapprochement des deux côtés latéraux et sur lesquels on a placé un dispositif de déclenchement qui est très souvent un simple fin de course.We have therefore sought to produce essentially mechanical devices comprising a limit switch. One of the embodiments which offers the advantage of simplicity is constituted by a ring generally of cylindrical shape. When this ring is stressed in longitudinal use, under the effect of the load, it deforms into an ellipse causing a bringing together of the two lateral sides and on which a triggering device has been placed which is very often a simple limit switch.
Lorsque la charge appliquée à l'anneau atteint la limite prévue, le contact du fin de course s'ouvre sous l'effet de la déformation de l'anneau, produisant un signal tel une alarme.When the load applied to the ring reaches the expected limit, the limit switch contact opens under the effect of the deformation of the ring, producing a signal such as an alarm.
Ce dispositif possède de nombreux inconvénients, à savoir : - le fin de course qui équipe ces capteurs est généralement un fin de course classique dont la course différentielle est très importante, d'où la nécessité d'avoir un anneau de dimension importante de manière à obtenir une déformation de plusieurs millimètres. - étant donné que la course différentielle est très grande, il est parfois nécessaire de placer une pré-contrainte sur le fin de course d'où un manque de précision et de sensibilité du dispositif.This device has many drawbacks, namely: - the limit switch fitted to these sensors is generally a conventional limit switch whose differential stroke is very large, hence the need to have a large dimension ring so as to obtain a deformation of several millimeters. - given that the differential travel is very large, it is sometimes necessary to place a pre-stress on the end of travel, hence a lack of precision and sensitivity of the device.
- compte-tenu de l'importance de la course différentielle, le seuil de coupure devra obligatoirement se situer à proximité de la charge nominale de l'anneau, d'où une plage de réglage et d'utilisation très réduite.- taking into account the importance of the differential travel, the cut-off threshold must be located close to the nominal load of the ring, resulting in a very limited adjustment and use range.
- si la surcharge est importante (effets dynamiques) l'anneau peut subir une déformation permanente ce qui le rend inutilisable. de plus, il n'est prévu aucun maintien latéral du dispositif de traction se plaçant sur l'anneau, ce qui peut perturber la répétabilité du déclenchement pour une même charge. Dans les dispositifs de l'état de la technique, le système de fin de course est en fait exposé à un risque important de bris ou de détériorations résultant des expositions en atmosphère industrielle ou autres, courantes pour la plupart des utilisations de matériels de ce type. En outre on observe que les axes servant à appliquer la force de traction ne sont pas maintenus, ce qui signifie qu'en déplaçant le point d'application de la force, le capteur devient totalement inopérant. Buts visés par la présente invention Le but visé par la présente invention est de fournir un capteur de traction du type mécanique à micro¬ rupteur évitant les inconvénients précités et pouvant être connecté directement à un moniteur de gestion ou en variante et/ou en combinaison, intégrant directement une alarme sonore et visuelle.- if the overload is significant (dynamic effects) the ring can undergo a permanent deformation which makes it unusable. in addition, no lateral support of the traction device is placed on the ring, which can disturb the repeatability of the release for the same load. In the devices of the state of the art, the limit switch system is in fact exposed to a significant risk of breakage or deterioration resulting from exposures in an industrial or other atmosphere, common for most uses of equipment of this type. . In addition, it is observed that the axes used to apply the tensile force are not maintained, which means that by moving the point of application of the force, the sensor becomes completely inoperative. Objectives of the present invention The object of the present invention is to provide a traction sensor of the mechanical type with micro-switch avoiding the aforementioned drawbacks and which can be connected directly to a management monitor or alternatively and / or in combination, directly integrating an audible and visual alarm.
A titre complémentaire, l'invention vise également à fournir un dispositif fiable résistant aux sollicitations extérieures et présentant une sensibilité et une précision élevées.In addition, the invention also aims to provide a reliable device resistant to external stresses and having sensitivity and precision high.
D'autres caratéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit, donnée à titre d'illustration seulement. Eléments caractéristiques de l'inventionOther characteristics and advantages of the invention will appear on reading the description which follows, given by way of illustration only. Character-defining elements of the invention
L'invention porte sur un capteur de traction constitué par une cellule de déformation de forme générale annulaire comportant un point d'encrage supérieur et un point d'encrage inférieur parfaitement localisés et reliés par deux branches. Il est caractérisé par le fait que deux bras sont montés sensiblement perpendiculairement à l'effort de traction s'exerçant selon l'axe reliant les deux points d'accrochage, et dont les longueurs sont telles que, tant que la limite de sollicitation n'est pas atteinte, les parties frontales desdits bras n'entrent pas en contact, et par le fait que les deux bras qui possèdent une résistance mécanique suffisante pour éviter toute déformation permanente de la cellule de déformation servent respectivement de logement à un micro-rupteur et de logement à une butée de contact, le micro-rupteur déclenchant un signal lorsqu'il entre en contact avec la butée.The invention relates to a traction sensor constituted by a deformation cell of generally annular shape comprising an upper anchoring point and a lower anchoring point perfectly located and connected by two branches. It is characterized by the fact that two arms are mounted substantially perpendicular to the tensile force exerted along the axis connecting the two attachment points, and the lengths of which are such that, as long as the stress limit does not is not reached, the front parts of said arms do not come into contact, and by the fact that the two arms which have sufficient mechanical strength to avoid any permanent deformation of the deformation cell serve respectively as housing for a microswitch and housing to a contact stop, the micro-switch triggering a signal when it comes into contact with the stop.
L'originalité de cette conception réside dans le fait que les branches qui forment la cellule de déformation travaillent tout d'abord en flexion pour apporter la déformation souhaitée et nécessaire au fonctionnement du capteur. Lorsque celle-ci est atteinte, les deux parties frontales des bras se touchent et les branches de la cellule ne sont plus sollicitées en flexion, mais en traction; ce qui provoque une résistance très élevée au capteur et une protection totale du micro-rupteur étant donné que la déformation transversale est totalement neutralisée.The originality of this design lies in the fact that the branches which form the deformation cell work first of all in bending to bring the desired deformation and necessary for the operation of the sensor. When this is reached, the two front parts of the arms touch and the branches of the cell are no longer stressed in bending, but in traction; which causes very high resistance to the sensor and total protection of the microswitch since the transverse deformation is completely neutralized.
Avantageusement, le micro-rupteur qui est logé dans l'un des bras est de très grande précision et la butée de contact qui est logée dans 1'autre bras est de préférence une vis de tarage à fin pas et accessible extérieurement par une ouverture d'accès qui pourrait être obturée après tarage, de préférence par un bouchon inviolable.Advantageously, the micro-switch which is housed in one of the arms is of very high precision and the contact stop which is housed in the other arm is preferably a calibration screw with fine pitch and accessible externally by an opening of 'access which could be closed after taring, preferably by a tamper-evident cap.
La cellule de déformation du capteur est conçue de manière à obtenir une déformation d'environ un millimètre pour la charge nominale et la course différentielle du micro¬ rupteur qui l'équipe est de 1 micron, ce qui confère à un capteur de 5.00Û Kg une étendue de 1.000 possibilités de tarage avec une sensibilité de 5 Kg.The sensor deformation cell is designed to so as to obtain a deformation of about one millimeter for the nominal load and the differential stroke of the micro¬ switch which is fitted with 1 micron, which gives a 5.00Û Kg sensor a range of 1,000 taring possibilities with a sensitivity of 5 Kg.
De plus, la déformation de la cellule étant limitée volontairement à ± 1 mm, et le micro-rupteur possédant une garde sécurité de 2 mm, il sera totalement impossible de le détériorer en faisant subir une surcharge quelconque au capteur.In addition, the deformation of the cell being voluntarily limited to ± 1 mm, and the microswitch having a security guard of 2 mm, it will be completely impossible to damage it by subjecting the sensor to any kind of overload.
Le micro-rupteur peut être relié par l'intermédiaire d'une fiche de raccordement à un dispositif de gestion et d'enregistrement que l'on appelle plus généralement moniteur de gestion. D'une autre manière ou en complément, le bras dans lequel est logé le micro-rupteur peut comporter une perforation pour permettre le passage de fils reliant le micro-rupteur à un dispositif d'alarme sonore ou lumineux. Ce dispositif d'alarme est logé de préférence dans l'espace libre entre les branches et les bras. Dans ce cas il pourrait comprendre : un circuit imprimé avec des composants électroniques, un buzzer, une "led" (light émission device) de signalisation et des piles d'alimentation. Brève description des dessins La figure 1 représente une vue en élévation d'un capteur selon 1'invention représentant les éléments constitutifs essentiels, et comportant un raccord pour le relier à un moniteur.The microswitch can be connected via a connection plug to a management and recording device which is more generally called a management monitor. In another way or in addition, the arm in which the micro-switch is housed may include a perforation to allow the passage of wires connecting the micro-switch to a sound or light alarm device. This alarm device is preferably housed in the free space between the branches and the arms. In this case it could include: a printed circuit with electronic components, a buzzer, a "led" (light emission device) signaling and power batteries. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an elevation view of a sensor according to the invention representing the essential constituent elements, and comprising a connector for connecting it to a monitor.
La figure 2 est similaire à la figure 1 mais comporte une perforation permettant de connecter le micro¬ rupteur directement à un dispositif d'alarme incorporé dans le capteur.Figure 2 is similar to Figure 1 but has a perforation for connecting the micro¬ switch directly to an alarm device incorporated in the sensor.
La figure 3 représente le dispositif de la figure 2 pourvu d'une plaquette de recouvrement pouvant comporter des caractéristiques d'identification.Figure 3 shows the device of Figure 2 provided with a cover plate which may include identification characteristics.
La figure 4 représente une vue de côté du dispositif de la figure 2 pourvu d'une plaquette de protection sur la face inférieure et d'une plaquette de protection sur la face supérieure de manière à placer le capteur en sandwich entre les deux plaques.Figure 4 shows a side view of the device of Figure 2 provided with a protective plate on the underside and a plate protection on the upper side so as to place the sensor sandwiched between the two plates.
Description d'une forme d'exécution préférée de l'invention Le capteur selon 1'invention représenté dans la forme d'exécution de la figure 1 est une cellule de déformation annulaire portant le repère général 1 qui dans le cas particulier représenté a la forme d'un losange mais qui pourrait également affecter la forme d'un ovale.Description of a preferred embodiment of the invention The sensor according to the invention represented in the embodiment of FIG. 1 is an annular deformation cell bearing the general reference 1 which in the particular case represented has the form of a rhombus but which could also affect the shape of an oval.
Il comporte un point d'accrochage supérieur 11 et un point d'accrochage inférieur 13 reliés par deux branches 15 et 17, ce qui constitue la cellule de déformation 1. Ces points d'accrochage 11 et 13 sont conçus de manière à pouvoir préserver l'élasticité de la cellule tout en maintenant en position les axes 19 servant à appliquer la force de traction sur la cellule.It comprises an upper attachment point 11 and a lower attachment point 13 connected by two branches 15 and 17, which constitutes the deformation cell 1. These attachment points 11 and 13 are designed so as to be able to preserve the elasticity of the cell while maintaining in position the pins 19 used to apply the tensile force to the cell.
Cette cellule 1 en forme d'anneau peut être intégrée dans une chaîne, une élingue ou une sangle de manutention, mais peut aussi bien être intercalée dans la fixation du brin mort sur un engin de levage. Par exemple, le capteur sera fixé en 11 à la structure du chariot ou du palan et le câble du brin mort sera fixé en 13.This ring-shaped cell 1 can be integrated into a chain, a sling or a handling strap, but can also be interposed in the fixing of the dead strand on a lifting machine. For example, the sensor will be fixed at 11 to the structure of the carriage or hoist and the dead strand cable will be fixed at 13.
La cellule de déformation est réalisée en acier éventuellement inoxydable, en aluminium ou tout matériau similaire. Sous l'effet d'une traction, l'anneau 1 se déforme en s'allongeant, la branche 15 se rapprochant de la branche 17.The deformation cell is made of possibly stainless steel, aluminum or any similar material. Under the effect of a traction, the ring 1 is deformed while elongating, the branch 15 approaching the branch 17.
C'est dans la partie médiane, c'est-à-dire dans le plan perpendiculaire au dessin à mi-distance entre les points d'accrochage 11 et 13 que ce rapprochement est le plus marqué.It is in the middle part, that is to say in the plane perpendicular to the drawing halfway between the attachment points 11 and 13 that this approximation is most marked.
L'effort de traction est dirigé selon les traits d'axe 19 dans la figure 1 et le plan médian est représenté en traits d'axe identifiés par le repère 21. Selon l'invention, et ceci avantageusement dans la zone médiane 21, deux bras 23 et 25, sensiblement perpendiculaires au sens de l'effort de traction selon l'axe 19 sont prévus. Ces bras 23 et 25 sont d'une résistance mécanique suffisante pour éviter toute déformation permanente de 1' nneau 1 et ils servent de logement pour un microrupteur 31 de grande précision (représenté schématiquement) et de logement pour une butée de contact qui est de préférence constituée par une vis de tarage 32.The tensile force is directed along the axis lines 19 in FIG. 1 and the median plane is represented in axis lines identified by the reference 21. According to the invention, and this advantageously in the middle zone 21, two arms 23 and 25, substantially perpendicular to the direction of the tensile force along the axis 19 are provided. These arms 23 and 25 are of sufficient mechanical strength to avoid any permanent deformation of the ring 1 and they serve as housing for a microswitch 31 of high precision (shown diagrammatically) and housing for a contact stop which is preferably constituted by a setting screw 32.
Les longueurs des bras 23 et 25 sont telles que les parties frontales respectives 23A et 25A des bras 23 et 25 n'entreront en contact que si par accident la charge nominale de l'anneau est largement dépassée, car le but est néanmoins grâce à l'intégration d'un anneau, d'éviter tout dépassement de la charge nominale.The lengths of the arms 23 and 25 are such that the respective front portions 23A and 25A of the arms 23 and 25 will only come into contact if by accident the nominal load of the ring is greatly exceeded, because the goal is nevertheless thanks to the 'integration of a ring, to avoid exceeding the nominal load.
Pour la compréhension du fonctionnement, il est important de savoir que la course entre le micro-rupteur 31 et la butée de contact 32 est toujours inférieure à la distance qui existe en les parties frontales 23A et 25A des bras 23 et 25.For the understanding of the operation, it is important to know that the travel between the microswitch 31 and the contact stop 32 is always less than the distance which exists in the front parts 23A and 25A of the arms 23 and 25.
En effet, dans tous les cas, le micro-rupteur 31 commutera à la valeur préréglée bien avant que les bras 23 et 25 n'entrent en contact frontal.Indeed, in all cases, the microswitch 31 will switch to the preset value well before the arms 23 and 25 come into frontal contact.
Dans le cas de la figure 1, le bras 25 est prolongé à l'aide d'un raccord 33 sur lequel peut être vissée une fiche de raccordement (non représentée) destinée à connecter l'anneau sur un moniteur de gestion. Dans ce cas, l'anneau aura une fonction de coupure à la valeur préréglée.In the case of FIG. 1, the arm 25 is extended using a connector 33 onto which a connection plug (not shown) can be screwed intended for connecting the ring to a management monitor. In this case, the ring will have a cut-off function at the preset value.
Dans le cas de la figure 2, il est également possible de prévoir en substitution ou en complément à la fiche de raccordement une sortie d'un câble du bras 25 par une perforation 35 et de raccorder ainsi le micro-rupteur 31 à un dispositif d'alarme sonore et/ou lumineux que l'on peut aisément loger dans l'espace libre entre les branches 15 et 17 et les bras 23 et 25.In the case of FIG. 2, it is also possible to provide, in substitution or in addition to the connection plug, an outlet for a cable from the arm 25 by a perforation 35 and thus to connect the microswitch 31 to a device d 'audible and / or luminous alarm which can easily be accommodated in the free space between the branches 15 and 17 and the arms 23 and 25.
De préférence ce dispositif d'alarme comprend : un circuit imprimé avec des composants électroniques, un buzzer 40, une "led" devsignalisation 41 et des piles 42 afin de le rendre autonome.Preferably, this alarm device comprises: a printed circuit with electronic components, a buzzer 40, a signaling "led" 41 and batteries 42 in order to make it autonomous.
Les bras 23 et 25 peuvent être pourvus de trous 38 permettant la fixation de deux plaquettes 39 (voir figure 3) . Dans ce cas, les deux plaquettes 39 auront pour objet de :The arms 23 and 25 can be provided with holes 38 allowing the fixing of two plates 39 (see FIG. 3). In this case, the two plates 39 will have the purpose of:
- servir de protection au dispositif d'alarme incorporé dans le capteur. - d'augmenter fortement la charge de rupture du capteur.- serve as protection for the alarm device incorporated in the sensor. - greatly increase the breaking load of the sensor.
- servir de support à une plaquette d'identification.- serve as a support for an identification plate.
Le capteur selon 1'invention présente un encombrement restreint et empêche toute dégradation de l'anneau 1 tout en protégeant efficacement le micro-rupteur 31.The sensor according to the invention has a limited size and prevents any degradation of the ring 1 while effectively protecting the microswitch 31.
L'accrochage aux points 11 et 13 prévus à cet effet est réalisé à l'aide des moyens classiques, tels que boîte à coin pour fixer des câbles, des cosses d'adaptation de chaîne, etc... Le capteur selon 1'invention peut servir de limiteur de charge pour une grue, un pont roulant ou tout autre moyen de levage ou de traction.The attachment to points 11 and 13 provided for this purpose is carried out using conventional means, such as a corner box for fixing cables, chain adaptation lugs, etc. The sensor according to the invention can be used as a load limiter for a crane, overhead crane or any other lifting or traction means.
Il est en principe prévu pour être fixé en permanence (mais de manière démontable) à une chaîne ou câble par exemple. Très souvent en effet pour amarrer des charges à un engin de levage, on utilise des chaînes ou des élingues dont la capacité est inférieure à la capacité de 1'engin de levage; dans ce cas le capteur selon l'invention permet d'éviter de soumettre chaque chaîne ou chaque câble à des surcharges et d'éviter ainsi de graves accidents.In principle, it is intended to be permanently fixed (but removably) to a chain or cable for example. Very often, in fact, for securing loads to a lifting device, chains or slings are used whose capacity is less than the capacity of the lifting device; in this case the sensor according to the invention makes it possible to avoid subjecting each chain or each cable to overloads and thus to avoid serious accidents.
Bien qu'on ait décrit une forme d'exécution préférée de l'invention, il doit être bien entendu que de nombreuses variantes d'exécution sont possibles.Although a preferred embodiment of the invention has been described, it should be understood that many alternative embodiments are possible.
C'est ainsi qu'en particulier, la forme de l'anneau n'est pas nécessairement celle du losange tel que représenté.Thus, in particular, the shape of the ring is not necessarily that of the rhombus as shown.
D'autres formes notamment des formes ovales peuvent être envisagées. La caractéristique essentielle deOther shapes, in particular oval shapes, can be envisaged. The essential characteristic of
1'invention est la présence des bras empêchant une déformation permanente de l'anneau et permettant le logement des éléments sensibles à l'intérieur de ceux-ci. 1'invention is the presence of arms preventing permanent deformation of the ring and allowing the housing of sensitive elements inside thereof.

Claims

REVENDICATIONS
1. Capteur de traction constitué d'une cellule de déformation (1) de forme générale annulaire comportant un point d'encrage supérieur (11) et un point d'encrage inférieur (13) reliés par deux branches (15 et 17), caractérisé en ce que deux bras (23 et 25) sont montés sensiblement perpendiculairement à l'effort de traction s'exerçant selon l'axe (19) reliant les deux points d'accrochage (11 et 13) et dont les longueurs sont telles que, tant que la limite de sollicitation n'est pas atteinte, les parties frontales (23A et 25A) desdits bras (23 et 25) n'entrent pas en contact et en ce que les deux bras (23 et 25) qui possèdent une résistance mécanique suffisante pour éviter toute déformation permanente de la cellule de déformation (1) servent respectivement de logement à un micro-rupteur (31) et de logement à une butée de contact (32), le micro-rupteur (31) déclenchant un signal lorsqu'il entre en contact avec la butée (32) .1. Traction sensor consisting of a deformation cell (1) of generally annular shape comprising an upper anchoring point (11) and a lower anchoring point (13) connected by two branches (15 and 17), characterized in that two arms (23 and 25) are mounted substantially perpendicular to the tensile force acting along the axis (19) connecting the two attachment points (11 and 13) and the lengths of which are such that, as long as the stress limit is not reached, the front parts (23A and 25A) of said arms (23 and 25) do not come into contact and in that the two arms (23 and 25) which have mechanical strength sufficient to avoid any permanent deformation of the deformation cell (1) respectively serve as housing for a micro-switch (31) and housing for a contact stop (32), the micro-switch (31) triggering a signal when it comes into contact with the stop (32).
2. Capteur selon la revendication 1 caractérisé en ce que la butée de contact (32) est constituée d'une vis de tarage accessible extérieurement par une ouverture d'accès et qui pourrait être obturée après tarage par un bouchon (43) , de préférence inviolable.2. Sensor according to claim 1 characterized in that the contact stop (32) consists of a calibration screw accessible externally by an access opening and which could be closed after calibration by a plug (43), preferably inviolable.
3. Capteur selon la revendication 1 ou 2 caractérisé en ce que la course entre le micro-rupteur (31) et la butée de contact (32) est toujours inférieure à la distance entre les parties frontales (23A et 25A) des deux bras (23 et 25) .3. Sensor according to claim 1 or 2 characterized in that the stroke between the microswitch (31) and the contact stop (32) is always less than the distance between the front parts (23A and 25A) of the two arms ( 23 and 25).
4. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce que le micro¬ rupteur (31) est relié par une fiche de raccordement un moniteur de gestion.4. Sensor according to any one of the preceding claims, characterized in that the micro¬ switch (31) is connected by a plug to a management monitor.
5. Capteur selon l'une quelconque des revendications précédentes caractérisé en que le bras (25) dans lequel est logé le micro-rupteur (31) comporte au moins une perforation pour le passage d'un câble reliant le micro¬ rupteur (31) à un dispositif d'alarme sonore et/ou lumineux.5. Sensor according to any one of the preceding claims, characterized in that the arm (25) in which the micro-switch (31) is housed comprises at least one perforation for the passage of a cable connecting the micro¬ switch (31) to an audible and / or luminous alarm device.
6. Capteur selon la revendication 5 caractérisé en ce que le dispositif d'alarme est logé dans l'espace libre entre les deux branches (15 et 17) et les deux bras (23 et 25) .6. Sensor according to claim 5 characterized in that the alarm device is housed in the free space between the two branches (15 and 17) and the two arms (23 and 25).
7. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce que la cellule de déformation annulaire (1) affecte la forme générale d'un losange.7. Sensor according to any one of the preceding claims, characterized in that the annular deformation cell (1) affects the general shape of a rhombus.
8. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce que la cellule de déformation (1) est réalisée en acier, en acier inoxydable, en aluminium.8. Sensor according to any one of the preceding claims, characterized in that the deformation cell (1) is made of steel, stainless steel, aluminum.
9. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce qu'il présente une sensibilité de 1/1000 de sa capacité nominale. 9. Sensor according to any one of the preceding claims, characterized in that it has a sensitivity of 1/1000 of its nominal capacity.
10. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce qu'il permet d'offrir un degré de protection I P 67.10. Sensor according to any one of the preceding claims, characterized in that it offers a degree of protection I P 67.
11. Capteur selon l'une quelconque des revendications précédentes caractérisé en ce que les deux points d'encrage (11 et 13) sont conçus de manière à pouvoir conserver l'élasticité de la cellule (1) tout en maintenant en position les deux axes (19) servant à appliquer la force de traction sur la cellule (1) . 11. Sensor according to any one of the preceding claims, characterized in that the two anchoring points (11 and 13) are designed so as to be able to retain the elasticity of the cell (1) while maintaining the two axes in position. (19) used to apply the tensile force to the cell (1).
PCT/BE1994/000020 1993-03-09 1994-03-09 Tensile force sensor WO1994020830A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9300227 1993-03-09
BE9300227A BE1008198A3 (en) 1993-03-09 1993-03-09 Tension sensor.

Publications (1)

Publication Number Publication Date
WO1994020830A1 true WO1994020830A1 (en) 1994-09-15

Family

ID=3886894

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE1994/000020 WO1994020830A1 (en) 1993-03-09 1994-03-09 Tensile force sensor

Country Status (2)

Country Link
BE (1) BE1008198A3 (en)
WO (1) WO1994020830A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037249A2 (en) * 2007-09-17 2009-03-18 Liebherr-Werk Nenzing GmbH Device for measuring mechanical parameters, method for measuring mechanical parameters and use of a device for measuring mechanical parameters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB532772A (en) * 1939-09-18 1941-01-30 Harold Edmund Austin Improvements in or relating to chains
DE882314C (en) * 1943-09-12 1953-07-09 Siemens Ag Device for measuring pulling forces
EP0130298A2 (en) * 1983-07-01 1985-01-09 MANNESMANN Aktiengesellschaft Load-measuring device for lifting apparatuses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB532772A (en) * 1939-09-18 1941-01-30 Harold Edmund Austin Improvements in or relating to chains
DE882314C (en) * 1943-09-12 1953-07-09 Siemens Ag Device for measuring pulling forces
EP0130298A2 (en) * 1983-07-01 1985-01-09 MANNESMANN Aktiengesellschaft Load-measuring device for lifting apparatuses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037249A2 (en) * 2007-09-17 2009-03-18 Liebherr-Werk Nenzing GmbH Device for measuring mechanical parameters, method for measuring mechanical parameters and use of a device for measuring mechanical parameters
EP2037249A3 (en) * 2007-09-17 2014-05-28 Liebherr-Werk Nenzing GmbH Device for measuring mechanical parameters, method for measuring mechanical parameters and use of a device for measuring mechanical parameters

Also Published As

Publication number Publication date
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