WO2002001108A1 - Individual protective device for conveyors - Google Patents

Individual protective device for conveyors Download PDF

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Publication number
WO2002001108A1
WO2002001108A1 PCT/FR2001/001997 FR0101997W WO0201108A1 WO 2002001108 A1 WO2002001108 A1 WO 2002001108A1 FR 0101997 W FR0101997 W FR 0101997W WO 0201108 A1 WO0201108 A1 WO 0201108A1
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WO
WIPO (PCT)
Prior art keywords
conveyor
operator
circuit
radio
transmitters
Prior art date
Application number
PCT/FR2001/001997
Other languages
French (fr)
Inventor
Daniel Huet
Original Assignee
Intelligent Safety Development
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 Intelligent Safety Development filed Critical Intelligent Safety Development
Priority to AU69254/01A priority Critical patent/AU6925401A/en
Publication of WO2002001108A1 publication Critical patent/WO2002001108A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/147—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using electro-magnetic technology, e.g. tags or radar

Definitions

  • the invention relates to an individual protection device for detecting the accidental presence of an operator on the transfer path of a conveyor, and comprising detection and control means intended to stop the conveyor drive as soon as the operator reaches a predetermined position.
  • the presence of an operator on the conveyor may occur following a fall, discomfort or accidental starting of the conveyor.
  • Conveyors are generally protected by safety cables located on either side of the conveyor to prevent access.
  • the object of the invention is to provide an individual protection device to reliably detect the accidental presence of an operator on a conveyor, regardless of the environment and the nature of the products transported, and without interfering with the loading of the conveyor, and the freedom of work of other operators around the conveyor.
  • a unit portable by the operator comprising a plurality of radio transmitters associated with transmitting antennas for the transmission of radio signals coded according to a predetermined sequence
  • a plurality of radio receivers placed under a gantry and equipped with directional receiving antennas, distributed to generate a selective electromagnetic radiation lobe of elongated shape in the direction of the conveyor, - a security module with a test transmitter to control the operation of the receivers,
  • the radio receivers are powered by a power supply inserted in the reception circuit, and each comprise a receiver circuit, and a shaping circuit in connection with said decoding circuit.
  • the radio transmitters are interconnected in the transmission circuit with a power supply, and a multiplexer circuit intended to deliver a coding signal to the various radio transmitters according to a predetermined sequence.
  • the multiplexer circuit includes a control circuit receiving a coded signal from a coding circuit, and a coupler controlled by a clock to issue validation orders to the control circuit according to said transmission sequence.
  • the radio transmitters are placed with the multiplexer circuit and the power supply inside a flexible belt, so that their emission diagrams are substantially perpendicular to the operator's body.
  • the cyclic transmission sequence is arranged to minimize the dead times of transmission on a part of the transmitter belt.
  • the transmitters of the portable unit operate continuously at different frequencies.
  • An auxiliary receiver can be placed at the foot of the conveyor and before the radio receivers, and has a pair of indicator lights to display the correct operation of the transmitters in the operator's portable unit when it approaches the conveyor.
  • FIG. 1 is a schematic view of the conveyor equipped with the protection device according to the invention
  • FIG. 2 shows the block diagram of the receiving detection unit positioned under the gantry of the conveyor
  • FIG. 3 represents the block diagram of a radio receiver used in the receiving detection unit
  • FIG. 4 is a schematic view of the transmitter belt of the portable unit
  • FIG. 5 illustrates the diagram of the alternating emission signals of the transmitters of the portable unit
  • - Figure 6 shows the block diagram of the multiplexer circuit developing the transmission sequence.
  • a conveyor 10 is associated with a protective portal 12 intended to detect the accidental presence of a person on the path of transfer of the transported products, and to cause the drive of the conveyor to stop as soon as the no one approaches the portal 12.
  • the gantry 12 is provided with a detection device 14 comprising a plurality of radio receivers R1, R2, R3 ... placed under the cap of the gantry 12 and at- above the transfer path of the conveyor 10, the number of receivers R1, R2, R3 being adapted to the width of the conveyor 10.
  • the radio receivers R1, R2, R3 are equipped with directional receiving antennas A1, A2, A3, distributed according to a selective electromagnetic LR radiation lobe in the form of an elongated pear extending longitudinally in the direction of travel of the conveyor 10, and laterally across the width of the gantry 12. The operator is thus detected in complete safety by the detection device 14 when 'it is on the conveyor 10, but it can work freely next to the gantry 12 without causing the conveyor 10 to stop unexpectedly.
  • a portable unit 16 is capable of being carried by the operator 18, and comprises a transmitter belt 20 intended to transmit radio signals to the detection device 14.
  • An auxiliary receiver 22 is placed at the foot of the conveyor 10 and before the main detection device 14, and includes a pair of indicator lights 24, 26 for testing the correct functioning of the transmitter belt 20 of the operator 18 when he approach to ten meters from conveyor 10.
  • the radio receivers R1, R2, R3 are identical, and interconnected with one another to obtain redundant operation, which is tested by a security module S comprising a test transmitter 28, and a monostable circuit 30 connected to the different receptors R1, R2, R3.
  • the test transmitter 28 is intended to transmit at regular intervals a radio alert signal SA to the receivers R1, R2, R3 to test the proper functioning of the latter.
  • Each radio receiver R1, R2, R3 comprises a receiver circuit 32 associated with the corresponding receiving antenna A1, A2, A3, and having for example a reception frequency of 433 MHz.
  • the output signal detected by the receiver circuit 32 is applied to a shaping circuit 34, and is recognized by a decoding circuit 36.
  • Adjusting elements 38 make it possible to adjust the code of the decoding circuit 36.
  • the three circuits 32, 34, 36 are supplied by a supply AL1 of the detection device 14.
  • the decoding circuit 36 is connected to a display circuit 40 and to an actuator 42, for example a switching relay or an emission coil, making it possible to transmit the alarm and to interrupt the drive of the conveyor 10 as soon as the operator 18 is on the transfer path and approaches the detection area.
  • the portable unit 16 of the transmitter belt 20 is provided with a plurality of transmitters E1, E2, E3, E4, E5 distributed around the flexible belt, and interconnected in a circuit of emission 44 alternated.
  • Each transmitter E1, E2, E3, E4, E5 is equipped with a transmitting antenna AE1, AE2, AE3, AE4, AE5.
  • a supply AL2 makes it possible to supply the transmission circuit 44, and a multiplexer circuit 46 delivers the coding signal in turn to the various transmitters E1, E2, E3, E4, E5.
  • the order of sending the coding signal is optimized as a function of the number of transmitters so that the transmission in loop around the body of the operator 18 takes place as quickly as possible.
  • FIG. 5 A diagram of the emission signals of the transmitters E1, E2, E3, E4, E5 is illustrated in FIG. 5, the emission sequence being by way of example 1 3 5 2 4 1 3 5 ... It is clear that any other emission sequence can be used to minimize the idle transmission times on part of the transmitter belt 20.
  • the transmitter belt 20 is additionally provided with an alarm 47 capable of emitting an audible signal as soon as the supply voltage AL2 is insufficient.
  • the multiplexer circuit 46 (FIG. 6) intended to send the different transmission orders, comprises a coding circuit 48 associated with adjustment elements 50 of the transmission code.
  • the output of the coding circuit 48 is connected to a shaping circuit 50 which delivers a coding signal SC to a control circuit 52.
  • the latter alternately sends the coding signal SC to the transmitters E1, E2, E3, E4 , E5 according to the aforementioned emission sequence, thanks to validation orders OV1, OV2, OV3, OV4, OV5 coming from a coupler 54 controlled by a clock H.
  • the operation of the individual protection device against the risk of entrainment on the conveyor 10 is as follows:
  • the operator 18 puts the portable unit 16 of his transmitter belt 20 under tension, causing the cyclic emission of the transmitters E1, E2, E3, E4, E5.
  • the transmission frequency of the transmitting antennas AE1, AE2, AE3, AE4, AE5 is adapted to that of the reception frequency, that is to say 435 MHz, but any other frequency greater than 1 MHz can be used.
  • the transmission sequence of the transmitters E1, E2, E3, E4, E5 is controlled by the clock H and the control circuit 52.
  • the transmitting antennas AE1, AE2, AE3, AE4, AE5 are positioned on the belt 20 so that their emission diagrams are substantially perpendicular to the operator's body and close to a hemisphere. The coded transmission signal is thus little affected by the body size and the clothing of the operator 18.
  • the auxiliary receiver 22 makes it possible to test the proper functioning of the transmitter belt 20.
  • the green control lamp 24 lights up upon reception of a transmission signal.
  • the receiver circuit 32 of the radio receivers R1, R2, R3 picks up the coded transmission signals as soon as the operator 18 enters under the gantry 1 in the electromagnetic LR radiation lobe of the detection device 14.
  • the decoding circuit 36 then transmits the alarm to the display circuit 40, and causes the actuator 42 to be excited to stop the drive of the conveyor 12.
  • the transmitters E1, E2, E3, E4, E5 can be arranged on the garment or an appropriate accessory worn by the operator 18.
  • Individual protection device for detecting the accidental presence of an operator (18) on the transfer path of a conveyor (10), and comprising detection and control means intended to stop the drive of the conveyor (10 ) as soon as the operator reaches a predetermined position, characterized in that the detection and control means include:
  • E1, E2, E3, E4, E5 associated with transmitting antennas (AE1, AE2, AE3, AE4, AE5) for the transmission of radio signals coded in a predetermined sequence
  • R1, R2, R3 a plurality of radio receivers (R1, R2, R3) placed under a gantry (12) and equipped with directional receiving antennas (A1, A2, A3), distributed to generate a selective electromagnetic radiation lobe (LR) of elongated shape in the direction of the conveyor (10),
  • a security module provided with a test transmitter (28) to control the operation of the receivers (R1, R2, R3),
  • a decoding circuit (36) cooperating with an actuator (42) to stop the drive means of the conveyor (12) when the operator (18) passes through said radiation lobe (LR).
  • the radio receivers (R1, R2, R3) are supplied by a power supply (AL1) inserted in the reception circuit, and each comprises a receiver circuit (32), and a shaping circuit (34) in connection with said decoding circuit (36).
  • the radio transmitters (E1, E2, E3, E4, E5) are interconnected in the transmission circuit (44) with a supply (AL2), and a circuit multiplexer (46) intended to deliver a coding signal to the various radio transmitters (E1, E2, E3, E4, E5) according to a predetermined sequence.
  • control circuit (52) receiving a coded signal (SC) from a coding circuit (48),
  • Individual protection device characterized in that the transmitting antennas (AE1, AE2, AE3, AE4, AE5) are positioned on the belt (20) so that their emission diagrams are substantially perpendicular to the body of the operator.
  • Individual protection device characterized in that the cyclic transmission sequence is arranged to minimize the transmission dead times on a part of the portable unit (16).
  • the transmitters (E1, E2, E3, E4, E5) of the portable unit (16) operate permanently at different frequencies.
  • an auxiliary receiver (22) is placed at the foot of the conveyor (10) and before the radio receivers (R1, R2, R3), and comprises a pair of control lights (24, 26) to visualize the good functioning of the transmitters (E1, E2, E3, E4, E5) of the portable unit (16) of the operator (18) when approaching of the conveyor (10).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Conveyors (AREA)

Abstract

The invention concerns an individual protective device comprising: a unit (16) portable by the operator (18), and including a plurality of radio transmitters associated with transmitting antennae for transmitting coded radio signals according to a predetermined sequence; a plurality of radio receivers (R1, A2, R3) placed beneath a protective tower (12) and equipped with directional reception antennae (A1, A2, A3), distributed to generate an elongated selective electromagnetic radiation lobe (LR) in the forward moving direction of the conveyor (10); a safety module (S) equipped with a test transmitter to control the operating conditions of the receivers (R1, R2, R3); and a decoding circuit co-operating with an actuator to stop the conveyor (12) driving means when the operator (18) passes in said radiation lobe (LR).

Description

Dispositif de protection individuelle pour convoyeursIndividual protection device for conveyors
Domaine technique de l'inventionTechnical field of the invention
L'invention est relative à un dispositif de protection individuelle pour détecter la présence accidentelle d'un opérateur sur le chemin de transfert d'un convoyeur, et comprenant des moyens de détection et de contrôle destinés à arrêter l'entraînement du convoyeur dès que l'opérateur atteint une position prédéterminée.The invention relates to an individual protection device for detecting the accidental presence of an operator on the transfer path of a conveyor, and comprising detection and control means intended to stop the conveyor drive as soon as the operator reaches a predetermined position.
La présence d'un opérateur sur le convoyeur peut intervenir à la suite d'une chute, d'un malaise ou d'un démarrage intempestif du convoyeur.The presence of an operator on the conveyor may occur following a fall, discomfort or accidental starting of the conveyor.
Etat de la techniqueState of the art
Les convoyeurs sont généralement protégés par des câbles de sécurité situés de part et d'autre du convoyeur pour en interdire l'accès.Conveyors are generally protected by safety cables located on either side of the conveyor to prevent access.
Ces câbles sont néanmoins inutilisables sur les gros convoyeurs, car ils interdisent le chargement à l'aide d'une pelleteuse, ou de tout autre engin manipulateur, et ils empêchent l'opérateur de monter sur le convoyeur pour le débourrage et la mise en place des produits convoyés. La seule sécurité consiste alors à prévoir un câble au-dessus du tapis du convoyeur, et pouvant être actionné manuellement par l'opérateur en cas de danger. La protection n'est toutefois efficace que si l'opérateur est conscient et valide.These cables are nevertheless unusable on large conveyors, because they prohibit loading using a backhoe, or any other manipulating machine, and they prevent the operator from getting on the conveyor for cleaning and setting up. conveyed products. The only security then consists in providing a cable above the conveyor belt, and which can be actuated manually by the operator in the event of danger. However, protection is only effective if the operator is aware and valid.
Divers moyens de détection ont été proposés, notamment des barrières avec des détecteurs à infra-rouge, et des analyseurs d'image. Les performances de ces dispositifs connus sont limitées par les diverses conditions d'exploitation des convoyeurs et du type des produits convoyés, notamment en cas de recouvrement de l'opérateur, de l'émission infra-rouge des matières plastiques sombres, de la présence de poussières, des réflexions parasites sur le tapis ou les parois du convoyeur, des perturbations ambiantes, de l'absorption du signal par l'opérateur, etc..Various means of detection have been proposed, in particular barriers with infrared detectors, and image analyzers. The performances of these known devices are limited by the various operating conditions of the conveyors and of the type of products conveyed, in particular in the event of covering of the operator, of the infrared emission of the dark plastic materials, of the presence of dust, of the parasitic reflections on the conveyor or the walls of the conveyor, ambient disturbances, absorption of the signal by the operator, etc.
Les documents US-A-5315289, DE-A-441009, et FR-A-9807720 décrivent des dispositifs de protection individuelle faisant usage de systèmes de transmission radioélectrique. Ces systèmes sont adaptés pour protéger les personnes travaillant sur des machines dangeureuses, mais ne conviennent pas pour une protection sur convoyeur.Documents US-A-5315289, DE-A-441009, and FR-A-9807720 describe personal protection devices making use of radio transmission systems. These systems are suitable for protecting people working on dangerous machines, but are not suitable for protection on a conveyor.
Objet de l'inventionSubject of the invention
L'objet de l'invention consiste à réaliser un dispositif de protection individuelle pour détecter d'une manière fiable la présence accidentelle d'un opérateur sur un convoyeur, indépendamment de l'environnement et de la nature des produits transportés, et sans gêner le chargement du convoyeur, et la liberté de travail des autres opérateurs autour du convoyeur.The object of the invention is to provide an individual protection device to reliably detect the accidental presence of an operator on a conveyor, regardless of the environment and the nature of the products transported, and without interfering with the loading of the conveyor, and the freedom of work of other operators around the conveyor.
Le dispositif selon l'invention est caractérisé en ce que les moyens de détection et de contrôle comportent :The device according to the invention is characterized in that the detection and control means include:
- une unité portable par l'opérateur, et comprenant une pluralité d'émetteurs radio associés à des antennes émettrices pour l'émission de signaux radio codés selon une séquence prédéterminée,a unit portable by the operator, and comprising a plurality of radio transmitters associated with transmitting antennas for the transmission of radio signals coded according to a predetermined sequence,
- une pluralité de récepteurs radio placés sous un portique et équipés d'antennes réceptrices directionnelles, réparties pour engendrer un lobe de rayonnement électromagnétique sélectif de forme allongée dans le sens du convoyeur, - un module de sécurité doté d'un émetteur de test pour contrôler le fonctionnement des récepteurs,- a plurality of radio receivers placed under a gantry and equipped with directional receiving antennas, distributed to generate a selective electromagnetic radiation lobe of elongated shape in the direction of the conveyor, - a security module with a test transmitter to control the operation of the receivers,
- et un circuit de décodage coopérant avec un actionneur pour stopper les moyens d'entraînement du convoyeur lorsque l'opérateur passe dans ledit lobe de rayonnement des récepteurs.- And a decoding circuit cooperating with an actuator to stop the conveyor drive means when the operator passes through said radiation lobe of the receivers.
Selon une caractéristique de l'invention, les récepteurs radio sont alimentés par une alimentation insérée dans le circuit de réception, et comportent chacun un circuit récepteur, et un circuit de mise en forme en liaison avec ledit circuit de décodage.According to a characteristic of the invention, the radio receivers are powered by a power supply inserted in the reception circuit, and each comprise a receiver circuit, and a shaping circuit in connection with said decoding circuit.
Selon un mode de réalisation préférentiel, les émetteurs radio sont interconnectés dans le circuit d'émission avec une alimentation, et un circuit multiplexeur destiné à délivrer un signal de codage aux différents émetteurs radio selon une séquence prédéterminée. Le circuit multiplexeur comporte un circuit de commande recevant un signal codé en provenance d'un circuit de codage, et un coupleur piloté par une horloge pour délivrer des ordres de validation au circuit de commande selon ladite séquence d'émission. Les émetteurs radio sont placés avec le circuit multiplexeur et l'alimentation à l'intérieur d'une ceinture souple, de manière que leurs diagrammes d'émission soient sensiblement perpendiculaires au corps de l'opérateur.According to a preferred embodiment, the radio transmitters are interconnected in the transmission circuit with a power supply, and a multiplexer circuit intended to deliver a coding signal to the various radio transmitters according to a predetermined sequence. The multiplexer circuit includes a control circuit receiving a coded signal from a coding circuit, and a coupler controlled by a clock to issue validation orders to the control circuit according to said transmission sequence. The radio transmitters are placed with the multiplexer circuit and the power supply inside a flexible belt, so that their emission diagrams are substantially perpendicular to the operator's body.
Selon une caractéristique de l'invention, la séquence d'émission cyclique est agencée pour minimiser les temps morts d'émission sur une partie de la ceinture émettrice.According to a characteristic of the invention, the cyclic transmission sequence is arranged to minimize the dead times of transmission on a part of the transmitter belt.
Selon une autre caractéristique de l'invention, au lieu d'une émission cyclique avec une même fréquence d'émission, les émetteurs de l'unité portable fonctionnent en permanence selon des fréquences différentes.According to another characteristic of the invention, instead of a cyclic transmission with the same transmission frequency, the transmitters of the portable unit operate continuously at different frequencies.
Un récepteur auxiliaire peut être placé au pied du convoyeur et avant les récepteurs radio, et comporte une paire de voyants de contrôle pour visualiser le bon fonctionnement des émetteurs de l'unité portable de l'opérateur lorsqu'il s'approche du convoyeur.An auxiliary receiver can be placed at the foot of the conveyor and before the radio receivers, and has a pair of indicator lights to display the correct operation of the transmitters in the operator's portable unit when it approaches the conveyor.
Description sommaire des dessinsBrief description of the drawings
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés dans lesquels:Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example, and represented in the appended drawings in which:
- la figure 1 est une vue schématique du convoyeur équipé du dispositif de protection selon l'invention;- Figure 1 is a schematic view of the conveyor equipped with the protection device according to the invention;
- la figure 2 montre le schéma synoptique de l'unité de détection réceptrice positionnée sous le portique du convoyeur;- Figure 2 shows the block diagram of the receiving detection unit positioned under the gantry of the conveyor;
- la figure 3 représente le schéma synoptique d'un récepteur radio utilisé dans l'unité de détection réceptrice,FIG. 3 represents the block diagram of a radio receiver used in the receiving detection unit,
- la figure 4 est une vue schématique de la ceinture émettrice de l'unité portable;- Figure 4 is a schematic view of the transmitter belt of the portable unit;
- la figure 5 illustre le diagramme des signaux d'émission alternée des émetteurs de l'unité portable; - la figure 6 représente le schéma synoptique du circuit multiplexeur élaborant la séquence d'émission.FIG. 5 illustrates the diagram of the alternating emission signals of the transmitters of the portable unit; - Figure 6 shows the block diagram of the multiplexer circuit developing the transmission sequence.
Description d'un mode de réalisation préférentielDescription of a preferred embodiment
Sur la figure 1 , un convoyeur 10 est associé à un portique 12 de protection destiné à détecter la présence accidentelle d'une personne sur le chemin de transfert des produits transportés, et à provoquer l'arrêt de l'entraînement du convoyeur dès que la personne s'approche du portique 12.In FIG. 1, a conveyor 10 is associated with a protective portal 12 intended to detect the accidental presence of a person on the path of transfer of the transported products, and to cause the drive of the conveyor to stop as soon as the no one approaches the portal 12.
Le portique 12 est muni d'un dispositif de détection 14 comprenant une pluralité de récepteurs radio R1 , R2, R3... placés sous le chapeau du portique 12 et au- dessus du chemin de transfert du convoyeur 10, le nombre de récepteurs R1 , R2, R3 étant adapté à la largeur du convoyeur 10. Les récepteurs radio R1 , R2, R3 sont équipés d'antennes réceptrices A1 , A2, A3 directionnelles, réparties selon un lobe de rayonnement LR électromagnétique sélectif en forme de poire allongée s'étendant longitudinalement dans le sens de défilement du convoyeur 10, et latéralement sur la largeur du portique 12. L'opérateur est ainsi détecté en toute sécurité par le dispositif de détection 14 lorsqu'il se trouve sur le convoyeur 10, mais il pourra travailler librement à côté du portique 12 sans provoquer l'arrêt intempestif du convoyeur 10.The gantry 12 is provided with a detection device 14 comprising a plurality of radio receivers R1, R2, R3 ... placed under the cap of the gantry 12 and at- above the transfer path of the conveyor 10, the number of receivers R1, R2, R3 being adapted to the width of the conveyor 10. The radio receivers R1, R2, R3 are equipped with directional receiving antennas A1, A2, A3, distributed according to a selective electromagnetic LR radiation lobe in the form of an elongated pear extending longitudinally in the direction of travel of the conveyor 10, and laterally across the width of the gantry 12. The operator is thus detected in complete safety by the detection device 14 when 'it is on the conveyor 10, but it can work freely next to the gantry 12 without causing the conveyor 10 to stop unexpectedly.
Une unité portable 16 est susceptible d'être portée par l'opérateur 18, et comprend une ceinture émettrice 20 destiné à émettre par radio des signaux d'émission en direction du dispositif de détection 14.A portable unit 16 is capable of being carried by the operator 18, and comprises a transmitter belt 20 intended to transmit radio signals to the detection device 14.
Un récepteur auxiliaire 22 est placé au pied du convoyeur 10 et avant le dispositif de détection 14 principal, et comporte une paire de voyants de contrôle 24, 26 pour tester le bon fonctionnement de la ceinture émettrice 20 de l'opérateur 18 lorsqu'il s'approche à une dizaine de mètres de convoyeur 10.An auxiliary receiver 22 is placed at the foot of the conveyor 10 and before the main detection device 14, and includes a pair of indicator lights 24, 26 for testing the correct functioning of the transmitter belt 20 of the operator 18 when he approach to ten meters from conveyor 10.
Sur les figures 2 et 3, les récepteurs radio R1 , R2, R3 sont identiques, et interconnectés entre eux pour obtenir un fonctionnement redondant, lequel est testé par un module de sécurité S comprenant un émetteur de test 28, et un circuit monostable 30 connecté aux différents récepteurs R1 , R2, R3. L'émetteur de test 28 est destiné à émettre à intervalles réguliers un signal radio d'alerte S A vers les récepteurs R1 , R2, R3 pour tester le bon fonctionnement de ces derniers. Chaque récepteur radio R1 , R2, R3 comporte un circuit récepteur 32 associé à l'antenne réceptrice A1 , A2, A3 correspondante, et ayant par exemple une fréquence de réception de 433 MHz. Le signal de sortie détecté par le circuit récepteur 32 est appliqué à un circuit de mise en forme 34, et est reconnu par un circuit de décodage 36. Des éléments de réglage 38 permettent d'ajuster le code du circuit de décodage 36. Les trois circuits 32, 34, 36 sont alimentés par une alimentation AL1 du dispositif de détection 14. Le circuit de décodage 36 est connecté à un circuit de visualisation 40 et à un actionneur 42, par exemple un relais de commutation ou une bobine à émission, permettant de transmettre l'alarme et d'interrompre l'entraînement du convoyeur 10 dès que l'opérateur 18 se trouve sur le chemin de transfert et s'approche de la zone de détection.In FIGS. 2 and 3, the radio receivers R1, R2, R3 are identical, and interconnected with one another to obtain redundant operation, which is tested by a security module S comprising a test transmitter 28, and a monostable circuit 30 connected to the different receptors R1, R2, R3. The test transmitter 28 is intended to transmit at regular intervals a radio alert signal SA to the receivers R1, R2, R3 to test the proper functioning of the latter. Each radio receiver R1, R2, R3 comprises a receiver circuit 32 associated with the corresponding receiving antenna A1, A2, A3, and having for example a reception frequency of 433 MHz. The output signal detected by the receiver circuit 32 is applied to a shaping circuit 34, and is recognized by a decoding circuit 36. Adjusting elements 38 make it possible to adjust the code of the decoding circuit 36. The three circuits 32, 34, 36 are supplied by a supply AL1 of the detection device 14. The decoding circuit 36 is connected to a display circuit 40 and to an actuator 42, for example a switching relay or an emission coil, making it possible to transmit the alarm and to interrupt the drive of the conveyor 10 as soon as the operator 18 is on the transfer path and approaches the detection area.
En référence aux figures 4 à 6, l'unité portable 16 de la ceinture émettrice 20 est dotée d'une pluralité d'émetteurs E1 , E2, E3, E4, E5 répartis autour de la ceinture souple, et interconnectés dans un circuit d'émission 44 alternée. Chaque émetteur E1 , E2, E3, E4, E5 est équipé d'une antenne émettrice AE1 , AE2, AE3, AE4, AE5. Une alimentation AL2 permet d'alimenter le circuit d'émission 44, et un circuit multiplexeur 46 délivre le signal de codage à tour de rôle aux différents émetteurs E1 , E2, E3, E4, E5. L'ordre d'envoi du signal de codage est optimisé en fonction du nombre d'émetteurs pour que l'émission en boucle autour du corps de l'opérateur 18 s'effectue le plus rapidement possible. Un diagramme des signaux d'émission des émetteurs E1, E2, E3, E4, E5 est illustré sur la figure 5, la séquence d'émission étant à titre d'exemple 1 3 5 2 4 1 3 5 ... Il est clair que tout autre séquence d'émission peut être utilisée pour minimiser les temps morts d'émission sur une partie de la ceinture émettrice 20. La ceinture émettrice 20 est munie en plus d'une alarme 47 susceptible d'émettre un signal sonore dès que la tension de l'alimentation AL2 est insuffisante.Referring to Figures 4 to 6, the portable unit 16 of the transmitter belt 20 is provided with a plurality of transmitters E1, E2, E3, E4, E5 distributed around the flexible belt, and interconnected in a circuit of emission 44 alternated. Each transmitter E1, E2, E3, E4, E5 is equipped with a transmitting antenna AE1, AE2, AE3, AE4, AE5. A supply AL2 makes it possible to supply the transmission circuit 44, and a multiplexer circuit 46 delivers the coding signal in turn to the various transmitters E1, E2, E3, E4, E5. The order of sending the coding signal is optimized as a function of the number of transmitters so that the transmission in loop around the body of the operator 18 takes place as quickly as possible. A diagram of the emission signals of the transmitters E1, E2, E3, E4, E5 is illustrated in FIG. 5, the emission sequence being by way of example 1 3 5 2 4 1 3 5 ... It is clear that any other emission sequence can be used to minimize the idle transmission times on part of the transmitter belt 20. The transmitter belt 20 is additionally provided with an alarm 47 capable of emitting an audible signal as soon as the supply voltage AL2 is insufficient.
Le circuit multiplexeur 46 ( figure 6) destiné à envoyer les différents ordres d'émission, comporte un circuit de codage 48 associé à des éléments de réglage 50 du code d'émission. La sortie du circuit de codage 48 est connectée à un circuit de mise en forme 50 qui délivre un signal de codage SC à un circuit de commande 52. Ce dernier envoie alternativement le signal de codage SC vers les émetteurs E1 , E2, E3, E4, E5 selon la séquence d'émission précitée, grâce à des ordres de validation OV1 , OV2, OV3, OV4, OV5 en provenance d'un coupleur 54 piloté par une horloge H. Le fonctionnement du dispositif de protection individuelle contre le risque d'entraînement sur le convoyeur 10 est le suivant :The multiplexer circuit 46 (FIG. 6) intended to send the different transmission orders, comprises a coding circuit 48 associated with adjustment elements 50 of the transmission code. The output of the coding circuit 48 is connected to a shaping circuit 50 which delivers a coding signal SC to a control circuit 52. The latter alternately sends the coding signal SC to the transmitters E1, E2, E3, E4 , E5 according to the aforementioned emission sequence, thanks to validation orders OV1, OV2, OV3, OV4, OV5 coming from a coupler 54 controlled by a clock H. The operation of the individual protection device against the risk of entrainment on the conveyor 10 is as follows:
L'opérateur 18 met l'unité portable 16 de sa ceinture émettrice 20 sous tension, entraînant l'émission cyclique des émetteurs E1 , E2, E3, E4, E5. La fréquence d'émission des antennes émettrices AE1 , AE2, AE3, AE4, AE5 est adaptée à celle de la fréquence de réception, c'est à dire 435 MHz, mais toute autre fréquence supérieure à 1 MHz peut être utilisée. La séquence d'émission des émetteurs E1 , E2, E3, E4, E5 est contrôlée par l'horloge H et le circuit de commande 52. Les antennes émettrices AE1 , AE2, AE3, AE4, AE5 sont positionnées sur la ceinture 20 pour que leurs diagrammes d'émission soient sensiblement perpendiculaires au corps de l'opérateur et proches d'un hémisphère. Le signal d'émission codé est ainsi peu affecté par la corpulence et les vêtements de l'opérateur 18.The operator 18 puts the portable unit 16 of his transmitter belt 20 under tension, causing the cyclic emission of the transmitters E1, E2, E3, E4, E5. The transmission frequency of the transmitting antennas AE1, AE2, AE3, AE4, AE5 is adapted to that of the reception frequency, that is to say 435 MHz, but any other frequency greater than 1 MHz can be used. The transmission sequence of the transmitters E1, E2, E3, E4, E5 is controlled by the clock H and the control circuit 52. The transmitting antennas AE1, AE2, AE3, AE4, AE5 are positioned on the belt 20 so that their emission diagrams are substantially perpendicular to the operator's body and close to a hemisphere. The coded transmission signal is thus little affected by the body size and the clothing of the operator 18.
Le récepteur auxiliaire 22 permet de tester le bon fonctionnement de la ceinture émettrice 20. Le voyant de contrôle 24 vert s'allume dès réception d'un signal d'émission.The auxiliary receiver 22 makes it possible to test the proper functioning of the transmitter belt 20. The green control lamp 24 lights up upon reception of a transmission signal.
En cas de présence accidentelle de l'opérateur 18 sur le chemin de transfert du convoyeur 10, le circuit récepteur 32 des récepteurs radio R1 , R2, R3 capte les signaux d'émission codés dès que l'opérateur 18 rentre sous le portique 1 dans le lobe de rayonnement LR électromagnétique du dispositif de détection 14. Le circuit de décodage 36 transmet ensuite l'alarme au circuit de visualisation 40, et provoque l'excitation de l'actionneur 42 pour arrêter l'entraînement du convoyeur 12.In the event of accidental presence of the operator 18 on the transfer path of the conveyor 10, the receiver circuit 32 of the radio receivers R1, R2, R3 picks up the coded transmission signals as soon as the operator 18 enters under the gantry 1 in the electromagnetic LR radiation lobe of the detection device 14. The decoding circuit 36 then transmits the alarm to the display circuit 40, and causes the actuator 42 to be excited to stop the drive of the conveyor 12.
Selon une variante de réalisation, les émetteurs E1 , E2, E3, E4, E5 de la ceinture émettrice 20, au lieu d'être pilotés cycliquement selon une séquence prédéterminée, fonctionnent tous en permanence, mais à des fréquences différentes. Au lieu d'utiliser une ceinture 20, les émetteurs E1 , E2, E3, E4, E5 peuvent être agencés sur le vêtement ou un accessoire approprié porté par l'opérateur 18. According to an alternative embodiment, the transmitters E1, E2, E3, E4, E5 of the transmitter belt 20, instead of being cyclically controlled according to a predetermined sequence, all operate continuously, but at different frequencies. Instead of using a belt 20, the transmitters E1, E2, E3, E4, E5 can be arranged on the garment or an appropriate accessory worn by the operator 18.
Revendicationsclaims
1. Dispositif de protection individuelle pour détecter la présence accidentelle d'un opérateur (18) sur le chemin de transfert d'un convoyeur (10), et comprenant des moyens de détection et de contrôle destinés à arrêter l'entraînement du convoyeur (10) dès que l'opérateur atteint une position prédéterminée, caractérisé en ce que les moyens de détection et de contrôle comportent :1. Individual protection device for detecting the accidental presence of an operator (18) on the transfer path of a conveyor (10), and comprising detection and control means intended to stop the drive of the conveyor (10 ) as soon as the operator reaches a predetermined position, characterized in that the detection and control means include:
- une unité portable (16) par l'opérateur (18), et comprenant une pluralité d'émetteurs radio (E1 , E2, E3, E4, E5) associés à des antennes émettrices (AE1 , AE2, AE3, AE4, AE5) pour l'émission de signaux radio codés selon une séquence prédéterminée,- a portable unit (16) by the operator (18), and comprising a plurality of radio transmitters (E1, E2, E3, E4, E5) associated with transmitting antennas (AE1, AE2, AE3, AE4, AE5) for the transmission of radio signals coded in a predetermined sequence,
- une pluralité de récepteurs radio (R1 , R2, R3) placés sous un portique (12) et équipés d'antennes réceptrices (A1 , A2, A3) directionnelles, réparties pour engendrer un lobe de rayonnement (LR) électromagnétique sélectif de forme allongée dans le sens du convoyeur (10),- a plurality of radio receivers (R1, R2, R3) placed under a gantry (12) and equipped with directional receiving antennas (A1, A2, A3), distributed to generate a selective electromagnetic radiation lobe (LR) of elongated shape in the direction of the conveyor (10),
- un module de sécurité (S) doté d'un émetteur de test (28) pour contrôler le fonctionnement des récepteurs (R1 , R2, R3),- a security module (S) provided with a test transmitter (28) to control the operation of the receivers (R1, R2, R3),
- et un circuit de décodage (36) coopérant avec un actionneur (42) pour stopper les moyens d'entraînement du convoyeur (12) lorsque l'opérateur (18) passe dans ledit lobe de rayonnement (LR).- And a decoding circuit (36) cooperating with an actuator (42) to stop the drive means of the conveyor (12) when the operator (18) passes through said radiation lobe (LR).
2. Dispositif de protection individuelle selon la revendication 1 , caractérisé en ce que les récepteurs radio (R1 , R2, R3) sont alimentés par une alimentation (AL1 ) insérée dans le circuit de réception, et comporte chacun un circuit récepteur (32), et un circuit de mise en forme (34) en liaison avec ledit circuit de décodage (36). 3. Dispositif de protection individuelle selon la revendication 1 , caractérisé en ce que les émetteurs radio (E1 , E2, E3, E4, E5) sont interconnectés dans le circuit d'émission (44) avec une alimentation (AL2), et un circuit multiplexeur (46) destiné à délivrer un signal de codage aux différents émetteurs radio (E1, E2, E3, E4, E5) selon une séquence prédéterminée.2. Individual protection device according to claim 1, characterized in that the radio receivers (R1, R2, R3) are supplied by a power supply (AL1) inserted in the reception circuit, and each comprises a receiver circuit (32), and a shaping circuit (34) in connection with said decoding circuit (36). 3. Individual protection device according to claim 1, characterized in that the radio transmitters (E1, E2, E3, E4, E5) are interconnected in the transmission circuit (44) with a supply (AL2), and a circuit multiplexer (46) intended to deliver a coding signal to the various radio transmitters (E1, E2, E3, E4, E5) according to a predetermined sequence.
4. Dispositif de protection individuelle selon la revendication 3, caractérisé en ce que le circuit multiplexeur (46) comporte:4. Individual protection device according to claim 3, characterized in that the multiplexer circuit (46) comprises:
- un circuit de commande (52) recevant un signal codé (SC) en provenance d'un circuit de codage (48),- a control circuit (52) receiving a coded signal (SC) from a coding circuit (48),
- et un coupleur (54) piloté par une horloge (H) pour délivrer des ordres de validation ( OV1, OV2, OV3, OV4, OV5) au circuit de commande (52) selon ladite séquence d'émission.- And a coupler (54) controlled by a clock (H) to deliver validation orders (OV1, OV2, OV3, OV4, OV5) to the control circuit (52) according to said transmission sequence.
5. Dispositif de protection individuelle selon la revendication 3, caractérisé en ce que les émetteurs radio (E1 , E2, E3, E4, E5) de l'unité portable (16) sont placés à l'intérieur d'une ceinture souple (20) avec le circuit multiplexeur (46) et l'alimentation (AL2).5. Individual protection device according to claim 3, characterized in that the radio transmitters (E1, E2, E3, E4, E5) of the portable unit (16) are placed inside a flexible belt (20 ) with the multiplexer circuit (46) and the power supply (AL2).
6. Dispositif de protection individuelle selon la revendication 5, caractérisé en ce que les antennes émettrices (AE1, AE2, AE3, AE4, AE5) sont positionnées sur la ceinture (20) pour que leurs diagrammes d'émission soient sensiblement perpendiculaires au corps de l'opérateur.6. Individual protection device according to claim 5, characterized in that the transmitting antennas (AE1, AE2, AE3, AE4, AE5) are positioned on the belt (20) so that their emission diagrams are substantially perpendicular to the body of the operator.
7. Dispositif de protection individuelle selon la revendication 1 , caractérisé en ce que la séquence d'émission cyclique est agencée pour minimiser les temps morts d'émission sur une partie de l'unité portable (16). 8. Dispositif de protection individuelle selon la revendication 1 , caractérisé en ce que les émetteurs (E1 , E2, E3, E4, E5) de l'unité portable (16) fonctionnent en permanence selon des fréquences différentes.7. Individual protection device according to claim 1, characterized in that the cyclic transmission sequence is arranged to minimize the transmission dead times on a part of the portable unit (16). 8. Individual protection device according to claim 1, characterized in that the transmitters (E1, E2, E3, E4, E5) of the portable unit (16) operate permanently at different frequencies.
9. Dispositif de protection individuelle selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un récepteur auxiliaire (22) est placé au pied du convoyeur (10) et avant les récepteurs radio (R1 , R2, R3), et comporte une paire de voyants de contrôle (24, 26) pour visualiser le bon fonctionnement des émetteurs (E1 , E2, E3, E4, E5) de l'unité portable (16) de l'opérateur (18) lorsqu'il s'approche du convoyeur (10). 9. Individual protection device according to any one of the preceding claims, characterized in that an auxiliary receiver (22) is placed at the foot of the conveyor (10) and before the radio receivers (R1, R2, R3), and comprises a pair of control lights (24, 26) to visualize the good functioning of the transmitters (E1, E2, E3, E4, E5) of the portable unit (16) of the operator (18) when approaching of the conveyor (10).
PCT/FR2001/001997 2000-06-26 2001-06-25 Individual protective device for conveyors WO2002001108A1 (en)

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AU69254/01A AU6925401A (en) 2000-06-26 2001-06-25 Individual protective device for conveyors

Applications Claiming Priority (2)

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FR00/08207 2000-06-26
FR0008207A FR2810650B1 (en) 2000-06-26 2000-06-26 PERSONAL PROTECTION DEVICE FOR CONVEYORS

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FR2844623A1 (en) * 2002-09-16 2004-03-19 Anjou Etude Site surveillance fixed/mobile installation having detector coupled energy feed and individual carrying badges detector recognising and where recognised within zone switching off energy feed
EP1914609A1 (en) * 2006-10-18 2008-04-23 Sick Ag Safety switch device comprising means for determining its position

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EP0533329A2 (en) * 1991-09-16 1993-03-24 Terry A. Fuller Anticipatory interactive protective system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE441009C (en) 1925-03-05 1927-02-21 Max Jaschke Dipl Ing Mobile device for leveling and tamping under tilting tracks to be lifted perpendicular to the track direction
DE2117168A1 (en) * 1971-04-08 1972-10-19 Bergwerksverband Gmbh Device for the radio transmission of signals and / or machine switching pulses between transmitting and receiving devices in underground operations, in particular for the purpose of accident prevention
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FR2420716A1 (en) * 1978-03-20 1979-10-19 Elimex Sa Safety system for machine operator - allows operation when receivers signify that transmitter on operator is in specific location
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FR2810650A1 (en) 2001-12-28
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