EP2532616B1 - Sicherheitssystem für eine vertikal beweglichen Plattform für einen Arbeiter - Google Patents

Sicherheitssystem für eine vertikal beweglichen Plattform für einen Arbeiter Download PDF

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Publication number
EP2532616B1
EP2532616B1 EP12169419.4A EP12169419A EP2532616B1 EP 2532616 B1 EP2532616 B1 EP 2532616B1 EP 12169419 A EP12169419 A EP 12169419A EP 2532616 B1 EP2532616 B1 EP 2532616B1
Authority
EP
European Patent Office
Prior art keywords
safety system
shaft
cam
rotatable
arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12169419.4A
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English (en)
French (fr)
Other versions
EP2532616A1 (de
Inventor
Stéphane Gerbier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lincoln Electric Company France SA
Original Assignee
Air Liquide Welding France
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Filing date
Publication date
Application filed by Air Liquide Welding France filed Critical Air Liquide Welding France
Publication of EP2532616A1 publication Critical patent/EP2532616A1/de
Application granted granted Critical
Publication of EP2532616B1 publication Critical patent/EP2532616B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms

Definitions

  • the invention relates to a mechanical safety device or system adapted to and adapted to react by activating a braking device in response to the occurrence of excessive speed or overspeed of a vertically movable platform for an on-board operator, in particular the mobile arm of an industrial bracket, such as a welding bracket with on-board operator, in particular an overspeed occurring in the event of sudden and sudden drop to the ground of said platform, and an installation, such as a welding bracket, equipped of such a security system.
  • Some metal structures of large dimensions that is to say of several meters, even tens of meters, can not be manufactured in one part and must therefore be formed by assembling smaller sub-parts which are welded between they.
  • wind turbine masts are generally formed by assembling several ferrules welded end-to-end, typically ferrules 3 to 10 meters in diameter.
  • ferrules typically ferrules 3 to 10 meters in diameter.
  • certain large equipment such as tanks or the like, used in the nuclear or naval field.
  • the welding of these sub-parts is generally done by implementing a method of submerged arc welding in multi-passes, namely up to 15 to 20 passes, depending on the thickness to be welded, and in configuration narrow joint.
  • the submerged arc welding for example of two ferrules with each other, is usually carried out on the top of the ferrules subjected to a rotational movement so as to be able to perform the deposition of metal from the fuse or son, along the weld joint.
  • Such a welding bracket comprises a vertical mast which supports a carrier arm movable vertically on the mast through an intermediate mobile device sliding along the mast, also called moving slide, on which is fixed the carrier arm.
  • a motorized system ensures the vertical rise of the arm along the mast.
  • the arm-carrier carries at its end an operator and equipment to operate and control the actual welding, including the welding torch or torches ...
  • This type of bracket is equipped with a braking device, commonly called “parachute” mechanical serving, in case of failure or breakage of a lifting element, such as a chain, an axis linking the chain to a support point or a gearbox shaft, to prevent the carrier arm from descending along the mast with too high a speed or “falling" speed and experiencing too much acceleration, which could cause damage to the installation and injuries to the operator, when the arm-carrier arrives at the bottom of the mast.
  • a braking device commonly called “parachute” mechanical serving
  • GB 2,046,206 A discloses a safety system comprising a rotary shaft, a ratchet wheel, a rotary cam and a pivoting lever carrying a pivoting arm with a pawl and a rotary roller which is adapted to cooperate with the rotary cam.
  • This braking device will, when triggered by an onboard security system, cooperate with the vertical mast of the bracket to block the downward movement of the arm-carrier.
  • the triggering of the braking device is currently done through a safety system comprising a point of attachment for a lifting chain cooperating with the braking device to lock an eccentric on a stop rail arranged on the mast and thus stop the fall of the arm-carrier.
  • the safety system and the braking device are also carried by the intermediate mobile device which slides along the mast.
  • the problem that arises then is to propose a safety system or device for a mobile platform installation with an on-board operator, in particular for a mobile arm-type jib along a vertical mast, such as a jib crane.
  • welding for reacting quickly in response to the occurrence of an underspeed of the platform or the arm-carrier, particularly in case of fall of said arm-carrier following the breakage or failure of an element of the system of lifting, that the overspeed corresponds to a frank or non-frank break, by cooperating with a mechanical parachute equipping the gallows so as to stop the movement of fall and also to avoid that the operator is injured or other elements of the installation deteriorated by the fall of the support arm or the mobile platform vertically.
  • the invention further relates to an installation with a vertically movable operator platform, characterized in that it is equipped with a safety system according to the invention.
  • facilities comprising a platform, including a nacelle or the like, supporting one or more operators and which are designed for and able to be lowered or raised vertically, for example an elevator or a mobile platform along a mast, or any person raising system using a fixed linear guide system to which a rack can be attached, and concerned by standards NF EN 1495, NF EN 280 and NF EN 14502-2; such installations may be used for example for cleaning or maintenance of external surfaces can be used, for example, for cleaning or maintenance of external surfaces of buildings, in particular for cleaning glazed surfaces or painting external or internal coatings, or even ceilings.
  • the invention relates to a mobile arm-bearing bracket along a vertical mast, in particular an on-board welding bracket, characterized in that it is equipped with a safety system according to the invention. invention.
  • the bracket also comprises an intermediate mobile device sliding along the mast carrying the arm, the safety system and a braking device, the pinion of the rotary shaft of said security system cooperating with a rack carried by the mast. vertical, and the free end of the pivoting lever being adapted to and adapted to actuate the braking device, when the rotational speed Va transmitted by the pinion to the shaft, when said pinion moves along the rack, is or becomes greater than or equal to the determined threshold speed Vs of rotation of the shaft.
  • the invention also relates to a welding method, in particular to the submerged arc, in which a bracket according to the invention is used.
  • the Figure 1 schematizes an embodiment of an industrial bracket for submerged arc welding of parts or subunits of large metal structures, for example ferrules 3 to 10 meters in diameter (measured at the joint plane). ), welded one after the other, that is to say, rabbits, to form a wind turbine mast, which is equipped with a security system according to the invention (designated by the general reference 100).
  • This welding bracket 20 comprises a vertical mast 21 which supports a carrier arm 22 that can move vertically, that is to say from below upwards, on the mast 21 by means of an intermediate mobile device 25 sliding along the mast, still called a mobile ram, on which the support arm 22 is fixed.
  • the carrying arm 22 carries at its free end 22a, the various equipment necessary for producing and controlling the welding, namely in particular a welding torch, a flux feed system and welding wire. , a seal monitoring system, a vision system .... and an onboard operator 30 which is used to position and control the welding equipment and to ensure the smooth running of the welding operation, in particular during the execution of the different successive passes.
  • the movement of the carrier arm 22 along the mast 21 is done in a manner known per se by means of a motorized system comprising a set of chains and pinions driven by a geared motor.
  • the mast 21 comprises a rack 24 intended to cooperate with the safety system 100 of the invention, as explained hereinafter, as well as a stop rail 23 cooperating with a braking device 50 or mechanical parachute capable of be actuated, that is to say triggered, by the safety system 100 of the invention in case of inadvertent fall of the carrier arm 22.
  • the security system 100 of the invention comprises a rotary shaft 4 of axis AA, of generally cylindrical shape, carrying a pinion 5, a ratchet wheel 1 and a rotary cam 2, these elements being integrally fixed to the shaft 4.
  • the pinion 5 when it moves in the rack 24 of the mast 21, rotates the shaft 4 on which it is arranged, which shaft 4 then drives the ratchet wheel 1 and the rotary cam 2 which are arranged integrally on the -this.
  • the shaft 4, the pinion 5, the ratchet wheel 1 and the rotary cam 2 form in fact an assembly integral in rotation.
  • the security system 100 further comprises a pivoting lever 3 and a fixed cam member 9.
  • the pivoting lever 3 is of elongate shape and has a free first end 3a capable of actuating the safety device 50, and a second end 3b carrying a pivoting arm 6, which itself carries a pawl 7 to the one of its ends and a rotating roller 8 at its other end.
  • the pivoting lever 3 pivots or tilts preferentially about the axis AA of the shaft 4. To do this, it may consist of an oblong-shaped part pierced at its center with a passage through which the shaft passes. 4.
  • pivoting arm 6 pivots or tilts about an axis BB distinct from the axis AA but preferably parallel or almost parallel to said axis AA.
  • the ratchet wheel 1 is formed of a body or wheel provided all around its periphery with one or more notches 11 intended to cooperate with the pawl 7 of the pivoting arm 6 as explained hereinafter and illustrated in FIGS. Figures 5A to 5D .
  • the rotary cam 2 comprises, in turn, a central body 16 provided with one or more radial projections 12 or teeth disposed around the periphery of said body 16 and projecting outwards.
  • the rotary roller 8 is adapted to and designed to cooperate with the rotary cam 2 to detect a sudden speed variation beyond a given threshold value Vs, corresponding to an unexpected fall of the carrying arm 2, then with the rail 19 of the follower member 9 after pivoting the pivoting lever 3 and actuating the safety device 50 for stopping the fall.
  • the threshold speed Vs can be between 2 and 5 m / min.
  • the speed can be adapted case by case by simply changing the diameter of the drive pinion 5.
  • the rotary roller 8 which is violently pushed by the cam 2 away from it, will cause a tilting of the pivoting arm 6 on which it is arranged, and at the same time a movement of approaching the pawl 7 carried by the other end of the pivoting arm 6 in the direction of the ratchet wheel 1, and the engagement of said pawl 7 in one of the notches 11 of the ratchet wheel 1.
  • the tilting of the lever 3 about the axis AA is stopped when the rotary roller 8 cooperates with the guide rail 19 of the cam member against fixed 9, to stop said tilting of the lever 3, which will further disengage the pawl 7 of the notch 11 of the ratchet wheel 1 and the lever 3 is then no longer required.
  • the profile of the guide rail 19 of the counter-cam member 9 serves as a counter-cam itself.
  • the follower member 9 also carries a terminal stop 19 'for stopping an excessive stroke of the roller 8 along the guide rail 19.
  • the guide rail 19 cam follower alone allows to stop the movement of the roller 8.
  • the guide rail 19 and the follower member 9 are formed of a single piece, preferably the end stop 19 'is also formed within this single piece.
  • the security system 100 of the invention After triggering, the security system 100 of the invention must be rearmed manually.
  • the security system 100 of the invention can equip different types of installation with vertically mobile embedded platform.
  • a bracket 20 equipped with a security system according to the invention can be used to weld 60 three-dimensional structures of large dimensions, that is to say several meters in diameter, the weld is circular 61, for example to assemble two circular or frustoconical ferrules 63, 64 to one another, or linear 62, for example to make the closing weld of a ferrule.
  • the bracket 20 may be placed or fixed on the ground or, where appropriate, movable on rails, wheels or the like.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)
  • Jib Cranes (AREA)

Claims (11)

  1. Sicherheitssystem (100), umfassend:
    - eine Drehwelle (4) mit einer Achse AA, die ein Ritzel (5), ein Sperrzahnrad (1) und einen Drehnocken (2) trägt,
    - einen Schwenkhebel (3), der ein erstes freies Ende (3a) und ein zweites Ende (3b) umfasst, das einen Schwenkarm (6) trägt, wobei der Schwenkarm (6) eine Sperrklinke (7) und eine drehbare Rolle (8) aufweist, und
    - ein Gegennockenelement (9), das eine Führungsschiene (19) umfasst, wobei der Schwenkhebel (3) sich um die Achse AA der Welle (4) dreht, die Sperrklinke (7) des Schwenkarms (6) angepasst und ausgebildet ist, um mit einer oder mehreren Einkerbungen (11), die von dem Sperrzahnrad (1) getragen werden, zusammenzuwirken, und die drehbare Rolle (8) angepasst und ausgebildet ist, um mit dem Drehnocken (2) oder mit der Führungsschiene (19) des Gegennockenelements (9) zusammenzuwirken.
  2. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schwenkarm (6) sich um eine Achse BB dreht, die zu der Achse AA der Welle (4) parallel ist.
  3. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Drehnocken (2) einen mittleren Körper (16) umfasst, der mit einem oder mehreren radialen Buckeln (12) versehen ist, die an dem Umfang des Körpers (16) angeordnet sind und nach außen vorspringen.
  4. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wenn die Drehgeschwindigkeit (Va) der Welle (4) kleiner als eine bestimmte Schwellengeschwindigkeit (Vs) ist, die drehbare Rolle (8) dann während der Drehung der Welle (4) mit dem Drehnocken (2) in Kontakt bleibt.
  5. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wenn die Drehgeschwindigkeit (Va) der Welle (4) größer oder gleich der bestimmten Schwellengeschwindigkeit (Vs) ist oder wird, die drehbare Rolle (8) dann durch den Nocken (2) relativ zu dem Drehnocken (2) hinweg geschoben wird, indem sie ein Schwenken des Schwenkarms (6) und das Eingreifen der Sperrklinke (7) in eine der Einkerbungen (11) des Sperrzahnrads (1) bewirkt.
  6. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Eingreifen der Sperrklinke (7) in eine der Einkerbungen (11) des Sperrzahnrads (1) ein Kippen des Hebels (3) bewirkt, der mit dem Schwenkarm (6), der die Sperrklinke (7) und die drehbare Rolle (8) trägt, durch Schwenken verbunden ist.
  7. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach dem Kippen des Hebels (3) die drehbare Rolle (8) mit der Führungsschiene (19) des Gegennockenelements (9) zusammenwirkt, um das Kippen des Hebels (3) zu sperren, wobei die drehbare Rolle (8) vorzugsweise gegen die Führungsschiene (19) des Gegennockenelements (9) zum Anschlag kommt.
  8. Sicherheitssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wenn die drehbare Rolle (8) mit der Führungsschiene (19) des Gegennockenelements (9) in Kontakt kommt, die Sperrklinke (7) sich aus der Einkerbung (11) des Sperrzahnrads (1) löst.
  9. Anlage mit vertikal beweglicher Plattform für einen an Bord befindlichen Arbeiter, dadurch gekennzeichnet, dass sie mit einem Sicherheitssystem (100) nach einem der vorhergehenden Ansprüche versehen ist.
  10. Träger (20) mit Auslegerarm (22), der entlang eines vertikalen Mastes (21) beweglich ist, insbesondere ein Schweißträger (20) für einen an Bord befindlichen Arbeiter (30), dadurch gekennzeichnet, dass er mit einem Sicherheitssystem (100) nach einem der Ansprüche 1 bis 8 versehen ist.
  11. Träger (20) nach Anspruch 10, dadurch gekennzeichnet, dass er ferner eine bewegliche Zwischenvorrichtung (25), die entlang des den Arm tragenden Mastes gleitet, das Sicherheitssystem (100) und eine Bremsvorrichtung (50) umfasst, wobei das Ritzel (5) der Drehwelle (4) des Sicherheitssystems (100) mit einer Zahnstange (24) zusammenwirkt, die von dem vertikalen Mast (21) getragen wird, und das freie Ende (3a) des Schwenkhebels (3) angepasst und ausgebildet ist, um das Bremssystem (50) zu betätigen, wenn die Drehgeschwindigkeit (Va), die durch das Ritzel (5) auf die Welle (4) übertragen wird, wenn das Ritzel (5) sich entlang der Zahnstange (24) bewegt, größer oder gleich der bestimmten Schwellendrehgeschwindigkeit (Vs) der Welle (4) ist oder wird.
EP12169419.4A 2011-06-06 2012-05-25 Sicherheitssystem für eine vertikal beweglichen Plattform für einen Arbeiter Not-in-force EP2532616B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1154872A FR2975983B1 (fr) 2011-06-06 2011-06-06 Systeme de securite pour plateforme a operateur embarque mobile verticalement

Publications (2)

Publication Number Publication Date
EP2532616A1 EP2532616A1 (de) 2012-12-12
EP2532616B1 true EP2532616B1 (de) 2015-07-01

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Application Number Title Priority Date Filing Date
EP12169419.4A Not-in-force EP2532616B1 (de) 2011-06-06 2012-05-25 Sicherheitssystem für eine vertikal beweglichen Plattform für einen Arbeiter

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EP (1) EP2532616B1 (de)
FR (1) FR2975983B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043395B1 (fr) 2015-11-06 2017-11-10 Commissariat Energie Atomique Dispositif microelectronique
CN111777000B (zh) * 2020-07-14 2021-11-05 国网湖北省电力有限公司直流运检公司 一种电力维修用升降机限速装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1155348A (en) * 1966-09-28 1969-06-18 Demag Zug Gmbh Safety Device for Preventing Crashing of Slides or Carriages in Stacking Cranes, Lift Trucks, and the like
FR2453105A1 (fr) * 1979-04-04 1980-10-31 Demag Ag Mannesmann Dispositif de securite pour un appareil destine a desservir des etageres
US5513723A (en) * 1994-07-01 1996-05-07 Harnischfeger Corporation Double-masted crane with improved brake arrangement
CA2547286C (en) * 2006-05-19 2015-09-15 Gerard Noel Braking device for elevating platform assembly

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FR2975983B1 (fr) 2013-07-05
FR2975983A1 (fr) 2012-12-07
EP2532616A1 (de) 2012-12-12

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