EP4149876A1 - Dispositif de préhension doté d'un système de commande de fermeture par multiplication de force démultipliée - Google Patents

Dispositif de préhension doté d'un système de commande de fermeture par multiplication de force démultipliée

Info

Publication number
EP4149876A1
EP4149876A1 EP21730798.2A EP21730798A EP4149876A1 EP 4149876 A1 EP4149876 A1 EP 4149876A1 EP 21730798 A EP21730798 A EP 21730798A EP 4149876 A1 EP4149876 A1 EP 4149876A1
Authority
EP
European Patent Office
Prior art keywords
rope
drive
gripping
cross member
grab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21730798.2A
Other languages
German (de)
English (en)
Inventor
Roland Eckgold
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.)
Maschinen und Industriebau Feld GmbH
Original Assignee
Maschinen und Industriebau Feld GmbH
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 Maschinen und Industriebau Feld GmbH filed Critical Maschinen und Industriebau Feld GmbH
Publication of EP4149876A1 publication Critical patent/EP4149876A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/12—Grabs actuated by two or more ropes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/02—Bucket grabs

Definitions

  • the invention relates to a gripping device for a rope gripper, containing a) a rope suspension to which the gripping device is attached, b) an upper cross member of the gripping device on which locking rods are articulated, c) a lower cross member of the gripping device on which gripping shells are articulated are, in each case at least one locking rod is articulated with a gripping shell, d) an actuating mechanism which controls the distance between the lower and upper cross member for opening or closing the gripping shells, wherein e) the actuating mechanism (48) has a mounting platform (50) on which a drive (52) with a reduction gear (54, 56) is arranged, which drives an adjusting device (58) for opening and closing the gripping trays (36), wherein the adjusting device (58) is connected to the upper traverse (24) and the lower traverse (34) in an actuating manner.
  • Such rope grabs such as excavators, cranes and similar machines, are used in particular to move or reload goods such as garbage, scrap, bulk material or the like by lifting them.
  • the machines have spoons, shell grabs, hooks, carabiners or other gripping means. They are therefore often used for loading or unloading ships, freight trains or trucks, for example.
  • So-called excavators are also known as rope grabs. These can reach relatively deep with their grippers or shell grippers. The depth of such machines is only limited by the length of the rope.
  • the grippers are operated by suitably arranged pulley blocks and pulleys.
  • Rope reels are driven by electric drives and / or internal combustion engines. These rope reels wind the rope or the ropes of the rope grab on or off as required.
  • the gripping shells are operated with ropes.
  • the gripping shells are opened or closed by lengthening or shortening the ropes.
  • DE 1731 261 U describes a hydraulically actuated multi-shell gripper which has resilient stops on the gripping shells which, when the gripper is opened, are supported on counter-stops of the lower box and limit the opening movement.
  • a gripper articulated on the boom of a work machine comprises at least two gripping shells which can be actuated by a hydraulic cylinder.
  • the gripping trays are articulated on a lower cross member.
  • Hydraulic cylinders are articulated on an upper cross member and are articulated to the gripping trays.
  • a spacer with a stop is located between the crossbars. The gripping trays are opened or closed by actuating the hydraulic cylinders.
  • DD 627 84 A5 relates to a universal excavator with hydraulic drive, which forms a crane with two grippers or rope scrapers.
  • the two-rope gripper or rope scraper is suspended from a boom on a pull rod.
  • DE 1223 121 mobile cranes are known which are used for grab operation. These mobile cranes are equipped with a two-rope grab that another rope drum is arranged next to the piece goods drum. As a closing drum, the piece goods drum opens and closes the gripper during gripper operation. The additional cable drum that can be coupled and uncoupled serves as a retaining cable drum. The holding ropes are coupled hydraulically and controlled manually.
  • DE 832 198 B relates to a motor gripper that works with closing ropes. The closing cable drum is usually located in a traverse and the rope then leads from a bottom block to an upper block or vice versa, mostly in the form of a pulley block.
  • the closing rope drum is provided with a rope guide which surrounds the rope on all sides and is intended to prevent it from being lifted off the drum.
  • the known machines, excavators or cranes that work on the basis of rope grabs have the disadvantage that the ropes suffer from relatively great wear.
  • the ropes are worn in particular by friction with the pulleys and / or the pulley blocks.
  • the ropes transfer the force to the gripping shells and control the gripping.
  • the object of the invention is therefore to avoid the disadvantages of the prior art and, in particular, to reduce the wear and tear on the ropes in rope grippers.
  • the object is achieved in that in gripping devices for a rope gripper of the type f) mentioned at the beginning, the drive has a rotatable drive cable drum with a drive cable, the control cables driving the drive cable drum, and the drive parts driving the drive cable drum in one direction around the axis of rotation To close the grab shells turn; and g) the adjusting device has a rope pulley with an adjusting rope that can be wound or unwound to control the distance between the cross members, wherein the pulley is rotatably mounted in the mounting platform and coupled to the reduction gear.
  • the invention is based on the principle that the reduction in power transmission is no longer solely dependent on relatively long ropes, which can be severely worn due to the friction that occurs. Rather, a reduction gear is now used, which is not subject to as much wear as the ropes.
  • the drive has a rotatable drive cable drum with a drive cable. This drive cable drum acts on the reduction gear and can be controlled remotely with a drive cable.
  • the drive cable drum can be rotated by the cables in two directions about its axis of rotation. As a result, the gripping device can be opened and closed with relatively large forces.
  • the adjusting device has a rope pulley with an adjusting rope that can be wound or unwound to control the distance between the cross members, the rope pulley being rotatably mounted in the assembly platform and coupled to the reduction gear.
  • a further advantageous embodiment of the gripping device according to the invention for a rope gripper is achieved in that the reduction gear is designed as a gear drive.
  • the gear train consisting of gears is not subject to so much wear.
  • a rope that uses a pulley system, for example, to reduce the forces, has to run long distances over it. This also brings with it a correspondingly high level of friction on the rollers or guides. As a result, the rope wears out quickly.
  • the gears of the gear transmission are not so susceptible to wear.
  • the adjusting device has a chain, a toothed rack and / or a spindle for controlling the distance between the cross members, which are driven via the reduction gear. It is preferable to avoid using ropes that are susceptible to wear. Therefore, with this measure, means are optionally used that are not subject to such high wear subject. This can be done, for example, by a chain, a toothed rack and / or a spindle. The combination of these enumerated means for controlling the distance between the traverses is also possible.
  • An advantageous embodiment of the gripping device according to the invention for a rope gripper also consists in that the mounting platform is provided on the lower cross member. With this measure it is achieved that the weight of the lower cross member for opening the gripping trays is increased. The gripping device with its gripping shells can thus be opened more easily by gravitational forces.
  • Fig. 1 shows in a perspective view an embodiment of a gripping device according to the invention.
  • Fig. 2 shows an enlarged section of the invention
  • 10 denotes a gripping device according to the invention.
  • the gripping device 10 is provided for a rope gripper 12.
  • the rope gripper 12 is only indicated as a boom 14 in this illustration.
  • a rope gripper 12 is understood here to mean a machine in which the gripping device 10 is held and possibly controlled by means of ropes 16.
  • the rope grab 12 can be, for example, a crane or an excavator.
  • the cables 16 run over the boom 14 of the cable gripper 12. With the holding ropes 18, the gripping device 10 can be pulled up or down on the boom 14.
  • the rope gripper 12 has a holding rope pulley, not shown, which rolls up or unrolls the holding ropes 18.
  • the gripping device 10 comprises a cable suspension 22 with which it is fastened to the holding cables 18.
  • the gripping device 10 contains an upper cross member 24 on which an eyelet 26 of the cable suspension 22 is provided in the center.
  • On the upper cross member 24, locking rods 28 are arranged in a star shape.
  • the locking rods 28 are articulated with screw bolts 30 in articulated mountings 32.
  • the gripping device 10 further comprises a lower cross member 34. Gripping trays 36 are articulated on the lower cross member 34.
  • the gripping shells 36 are each pivotably screwed with their upper gripping shell end 38 in a hinge bracket 40 to the lower cross member 34 with screw bolts 42.
  • at least one locking rod 28 is always articulated to a gripping shell 36, in each case via a hinge bracket 44 with screw bolts 46.
  • the distance between the cross members 24, 34 In order to actuate the gripping device 10, the distance between the cross members 24, 34 must be changed as required. To open the gripping trays 36, the distance between the cross members 24, 34 is increased. To close the gripping trays 36, the distance between the cross members 24, 34 is reduced accordingly.
  • Actuating mechanism 48 controls the distance between the lower and upper Traverse for opening or closing the gripping trays 36. The weight of the gripping trays 36 acts upon opening.
  • the actuation mechanism 48 is mounted on the lower cross member 34 in a mounting platform 50.
  • the mounting platform 50 is attached to the lower cross member 24.
  • a drive 52 with reduction gears 54, 56 are arranged on the assembly platform 50 as components of the actuation mechanism 48.
  • the reduction gears 54, 56 drive an adjusting device 58 for opening and closing the gripping trays 36.
  • the adjusting device 58 is connected to the upper cross member 24 and the lower cross member 34 so that the distance between the cross members 24, 34 can be changed.
  • the drive 52 consists of a cylindrical drive cable drum 60 which is rotatably mounted in the assembly platform 50 via a shaft 61 which corresponds to the axis of rotation 61a of the drive drum 60.
  • the control cables 20 are passed through openings 63 in the upper cross member 24 and drive the drive cable drum 60. Deflection pulleys 65 prevent excessive abrasion of the control cables 20 when they enter the openings 63.
  • a first drive cable 20a and a second drive cable 20b of the control cables 20 actively drive the drive drum 60 about the axis of rotation 61a to close the gripping trays 36. Due to the weight of the gripping device 10, the drive cable drum 60 is correspondingly rotated in the opposite direction to the opening of the gripping shells 36.
  • a motor such as an electric motor or a hydraulic or pneumatic motor, can alternatively be used to drive the reduction gears 54, 56.
  • the reduction gears 54, 56 act forcefully on the shaft 61 at the side of the drive cable drum 60.
  • the reduction gears 54, 56 are coupled to the actuating device 58.
  • the adjusting device 58 consists of two rope pulleys 62, 64.
  • the rope pulleys 62, 64 are also rotatably mounted in the assembly platform 50.
  • the pulleys 62, 64 of the Adjusting device 56 wind adjusting ropes 66, 68 up or down.
  • the adjusting ropes 66, 68 are each anchored at one end to the upper cross member 24 with brackets 70, 72.
  • the adjusting cables 66, 68 are unwound, the distance between the upper cross member 24 and the lower cross member 34 is increased.
  • the gripping trays 36 open for gripping.
  • the distance between the cross members 24, 34 is reduced by winding up the adjusting ropes 66, 68 so that the gripping trays 36 are closed.
  • FIG. 2 shows an enlarged section in the area of the actuating mechanism 48 of the gripping device 10, as shown in FIG. 1.
  • the actuation mechanism 48 is mounted on the lower cross member 34 in the mounting platform 50.
  • the mounting platform 50 is attached to the lower cross member 34.
  • the drive 52 is arranged with the reduction gears 54, 56 on the mounting platform 50.
  • the locking rods 28 have not been shown for reasons of clarity.
  • the drive cable drum 60 of the drive 52 is rotatably mounted in the assembly platform 50 via a rotation axis 62.
  • the control ropes 20 drive the
  • the drive parts 20a and 20b rotate the drive cable drum 60 in one direction about the axis of rotation 61a, actively driven to close the gripping shells 36.
  • the weight of the gripping device 10 rotates the drive cable drum 60 in the opposite direction to open the gripping shells 36.
  • the reduction gears 54, 56 act forcefully laterally to the
  • gear drives 74, 76 with gears 78, 80.
  • the gears 78, 80 are designed as gear drives 74, 76 with gears 78, 80.
  • the gears 78, 80 are designed as gear drives 74, 76 with gears 78, 80.
  • the gears 78, 80 are also rotatably mounted in the mounting platform 50.
  • the gears 78, 80 mesh with one another in such a way that a reduction of the rotation is transmitted.
  • the reduction gears 54, 56 are coupled to the actuating device 58.
  • the rope pulleys 62, 64 of the adjusting device 58 are also in the assembly platform 50 rotatably mounted.
  • the rope pulleys 62, 64 of the adjusting device 56 wind the adjusting ropes 66, 68 on and off.
  • the adjusting cables 66, 68 are each anchored at their ends to the upper cross member 24 with brackets 70, 72.
  • the adjusting cables 66, 68 are unwound, the distance between the upper cross member 24 and the lower cross member 34 is increased.
  • the gripping trays 36 open for gripping.
  • the distance between the cross members 24, 34 is reduced by winding up the adjusting ropes 66, 68 so that the gripping trays 36 are closed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

L'invention concerne un dispositif de préhension (10) pour un grappin à câble (12). Le dispositif de préhension (10) comprend une suspension de câble (22) sur laquelle le dispositif de préhension (10) est fixé. Des tiges de fermeture (28) sont montées articulées sur une traverse supérieure (24) du dispositif de préhension (10). Des coques de préhension (36) sont montées articulées sur une traverse inférieure (34) du dispositif de préhension (10), dans chaque cas au moins une tige de fermeture (28) étant reliée articulée à une coque de préhension (36). Un mécanisme d'actionnement (48) commande l'écart entre la traverse inférieure (34) et la traverse supérieure (24) pour ouvrir ou fermer les coques de préhension (36). Le mécanisme d'actionnement (48) comporte une plateforme de montage (50) sur laquelle est montée une transmission (52) dotée d'un engrenage réducteur (54, 56), lequel actionne un dispositif de réglage (58) destiné à ouvrir et à fermer les coques de préhension (36). A cet effet, le dispositif de réglage (58) est relié fonctionnellement à la traverse supérieure (24) et à la traverse inférieure (34). La transmission (52) comporte un tambour à câbles d'entraînement (60) muni de câbles d'entraînement (20a, 20b) qui entraînent le tambour à câbles d'entraînement (60), lesdits câbles d'entraînement (20a, 20b) faisant tourner le tambour à câbles d'entraînement (60) dans une direction autour de l'axe de rotation (61a) pour fermer les coques de préhension (36). Le dispositif de réglage (58) comporte une poulie (62, 64) munie d'un câble de réglage (66, 68) pouvant être enroulé et déroulé afin de commander l'écart entre les traverses (24, 34), la poulie (62, 64) étant montée rotative dans la plateforme de montage (50) et étant accouplée à l'engrenage réducteur (54, 56).
EP21730798.2A 2020-05-14 2021-05-12 Dispositif de préhension doté d'un système de commande de fermeture par multiplication de force démultipliée Pending EP4149876A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020113081.3A DE102020113081A1 (de) 2020-05-14 2020-05-14 Greifvorrichtung mit Schließantrieb durch übersetzte Kraftvervielfältigung
PCT/DE2021/100432 WO2021228329A1 (fr) 2020-05-14 2021-05-12 Dispositif de préhension doté d'un système de commande de fermeture par multiplication de force démultipliée

Publications (1)

Publication Number Publication Date
EP4149876A1 true EP4149876A1 (fr) 2023-03-22

Family

ID=76325321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21730798.2A Pending EP4149876A1 (fr) 2020-05-14 2021-05-12 Dispositif de préhension doté d'un système de commande de fermeture par multiplication de force démultipliée

Country Status (3)

Country Link
EP (1) EP4149876A1 (fr)
DE (1) DE102020113081A1 (fr)
WO (1) WO2021228329A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115303955B (zh) * 2022-08-23 2024-03-29 浙江浙起机械有限公司 一种大吨位抓斗桥式起重机
CN116553199B (zh) * 2023-05-29 2024-02-06 临沂和创饲料有限公司 一种可调整抓距的自动码垛机抓手

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE603166C (de) 1934-09-24 Reichmann Becker Polyp G M B H Motorgreifer
US725794A (en) * 1903-01-14 1903-04-21 Swan Swedenborg Clam-shell bucket.
FR470958A (fr) * 1914-04-06 1914-10-08 Leon Vincent Benne automatique
DE832198C (de) 1950-03-23 1952-02-21 Demag Greiferfabrik G M B H Motorgreifer
DE1731261U (de) 1956-06-23 1956-10-04 Wilhelm Scheidt Maschinenfabri Mehrschalengreifer.
DE1223121B (de) 1962-09-07 1966-08-18 Demag Zug Gmbh Mobilkran fuer hilfsweisen Greiferbetrieb mit einem Zweiseilgreifer
DE7613642U1 (de) 1976-04-30 1977-08-04 Schuster, Siegfried, 8921 Birkland Zangengreifer
DE2718434C2 (de) 1977-04-26 1979-06-28 Fa. Johannes Fuchs, 7257 Ditzingen Am Ausleger einer Arbeitsmaschine angelenkter Greifer

Also Published As

Publication number Publication date
WO2021228329A1 (fr) 2021-11-18
DE102020113081A1 (de) 2021-11-18

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