DE3445610C1

DE3445610C1 - Dredger

Info

Publication number: DE3445610C1
Application number: DE19843445610
Authority: DE
Inventors: Wolfgang 6720 Speyer Rohr
Original assignee: Rohr GmbH
Current assignee: Rohr GmbH
Priority date: 1984-12-14
Filing date: 1984-12-14
Publication date: 1986-01-02
Also published as: JPS61143290A

Abstract

A dredger having a floating body 1 is concerned. On this floating body 1, a cross girder 3 provided with a travel arm 4 for a crab 5 is located on a supporting framework. Arranged on the crab 5 is a lifting mechanism 6 for a grab 8 which can be lifted and lowered via a rope 9. Suspended on one side of the cross girder 3 is a counterweight which is connected via a rope 10 to the grab 8 in an opposed lifting and lowering movement. <IMAGE>

Description

Der etwa um 20% gegenüber dem Gegengewicht 12 schwerere Greifer 8 wird beim Anheben durch das sich gleichzeitig absenkende Gegengewicht 12 im Gewicht entlastet, wobei umgekehrt beim Absenken des Greifers 8 nur geringe Bremskräfte am Hubwerk 6 wirken. Beim Aufsetzen des Greifers 8 auf dem Seeboden sind die Hubwerksbremsen geschlossen, so daß der Greifer mit seinem vollen Gewicht ohne Entlastung graben kann. The gripper 8, which is roughly 20% heavier than the counterweight 12 becomes when lifting through the itself counterweight lowering at the same time 12 relieved in weight, while conversely when lowering the gripper 8 only slight Braking forces act on hoist 6. When placing the gripper 8 on the seabed the hoist brakes are closed, so that the grab with its full weight can dig without relief.

In dem gezeigten Ausführungsbeispiel ist auf der Halgewinde 7 eine zusätzliche Wickelfläche für das Seil 10 vorgesehen. Man kann das Seil 10 zur Haltewinde 7 auch so anordnen, daß sich dieses Seil 10 beim Absenken des Greifers 8 auf die freiwerdende Haltewinde 7 direkt aufwickelt. In the embodiment shown, on the half-thread 7 is a additional winding surface for the rope 10 is provided. You can use the rope 10 to hold the winch 7 also arrange so that this rope 10 when lowering the gripper 8 on the released retaining thread 7 winds directly.

Durch diese Ausbildung und Anordnung des Gegengcwichts 12 läßt sich auch der Antrieb 15 für die Laufkalze 5 vereinfachen, wobei dieser Antrieb am gegenüberliegenden Ende des Querträgers 3 zur Umlenkrolle 11 angeordnet ist. Der Antrieb erfolgt über ein Seil 16, wobei bei einer Bewegung in Richtung zum Katzfahrantrieb 15 eine Zugkraft ausgeübt wird, während in der entgegengesetzten Richtung die Laufkatze 5 von dem Gegengewicht gezogen wird und am Antrieb 15 eine Bremswirkung erzeugt werden muß. This design and arrangement of the counterweight 12 can also simplify the drive 15 for the roller 5, this drive on the opposite The end of the cross member 3 is arranged for the deflection roller 11. The drive takes place via a rope 16, with a pulling force when moving in the direction of the trolley drive 15 is exercised while in the opposite direction the trolley 5 of the Counterweight is pulled and a braking effect must be generated on drive 15.

Bei der in den Fig.3 und 4 dargestellten Ausführungsform wird der Greifer 8 direkt mit dem Gegengewicht 12 entlastet, indem das Seil 10 über eine zusätzliche Umlenkrolle 17 auf der Laufkatze 5 am Greifer 8 befestigt ist. Bei leicht baggerfähigem Material ist diese Ausführungsform ohne weiteres anwendbar. In the embodiment shown in Figures 3 and 4, the Gripper 8 relieved directly with the counterweight 12 by the rope 10 over a additional pulley 17 is attached to the trolley 5 on the gripper 8. With easy This embodiment is readily applicable to excavable material.

Bei der Ausführungsform nach den F i g. 5 und 6 ist die Laufkatze 5 mit einem eigenen Fahrantrieb versehen, wobei das Seil 10 über zwei zusätzliche Umlenkrollen 18,19, jeweils am Ende des Querträgers 3 umgelenkt und an der anderen Seite der Laufkatze 5 befestigt ist. In the embodiment according to FIGS. 5 and 6 is the trolley 5 provided with its own drive, the rope 10 has two additional Deflection rollers 18, 19, each deflected at the end of the cross member 3 and at the other Side of the trolley 5 is attached.

Die in den F i g. 7 und 8 dargestellte Ausführungsform ist für einen Vierseilgreiferbetrieb geeignet, wobei auf der Laufkatze 5 neben der Haltewinde 7 noch eine Schließwinde 20 angeordnet ist. Das Seil 10 für das Gegengewicht 12 ist hierbei an der Haltewinde 7 angeordnet. The in the F i g. 7 and 8 illustrated embodiment is for a Four-rope gripper operation suitable, being on the trolley 5 in addition to the retaining winch 7 a closing winch 20 is also arranged. The rope 10 for the counterweight 12 is here arranged on the retaining thread 7.

Schließlich zeigen die Fig. 9 und 10 eine Ausführungsform, bei der für einen solchen Hydraulikgreiferbetrieb an einer Vierseilwinde das Gegengewicht 12 geteilt ist und das jeweilige Teilgewicht einmal an der Haltewinde 7 bzw. an der Schließwinde 20 angeordnet ist. Es kann hierbei der vorhandene Fahrantrieb für die Laufkatze 5 beibehalten werden. Finally, FIGS. 9 and 10 show an embodiment in which the counterweight for such hydraulic grab operation on a four-rope winch 12 is divided and the respective part weight once on the retaining thread 7 or on the closing winch 20 is arranged. It can use the existing drive for the trolley 5 can be maintained.

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Claims

Claims: 1. Dredger with a floating body on which a cross member with a travel arm for a trolley is arranged on a frame is on which the hoist with a retaining thread for a suspended on ropes Gripper is attached and which is provided with a drive, d a -marked by, that a counterweight (12) is suspended on one side of the cross member (3), this via a rope (10) with the gripper (8) in an opposite lifting and lowering movement connected is.

2. Dredger according to claim 1, characterized in that the Cable (10) connected to the retaining thread (7) of the hoist (6) and running opposite to the Gripper rope (9) is wound.

3. Dredger according to claim 1, characterized in that a Pull rope (16) of the trolley drive (15) on the opposite side to the counterweight (12) is attached to one side of the trolley (5).

4. Floating dredger according to one of claims 1 to 3, characterized in that that in a four-rope gripper operation with a closing winch (20) and a retaining winch (7) the rope (10) of the counterweight can be wound onto the retaining thread (7).

5. Floating dredger according to one of claims 1 to 4, characterized in that that with a self-propelled trolley (5) the rope (10) of the Counterweight (12) via another pulley (18) on the cross member (3) to the opposite one Carrier side is guided with another pulley (19) and to the trolley (5).

6. Floating dredger according to claim 4 or 5, characterized in that that the counterweight (12) divided and each part weight on one side of the cross member (3) suspended and with a four-rope winch for hydraulic grab operation the closing winch (20) or the retaining thread (7) is connected.

The invention relates to a dredger with a floating body, on which a cross member with a travel arm for a trolley is arranged on a scaffold is, on the one having a retaining thread, the hoist for a suspended on ropes Gripper is attached and which is provided with a drive.

Such dredgers are known for the extraction of sand and gravel from great depths are used. Clamshell grabs are used for dredging, opening and closing either with the aid of ropes or hydraulic equipment he follows. The grab is suspended from a trolley that is either self-propelled is formed, or has a cable drive. For raising and lowering the grapple a hoist that drives the cable winch is arranged on the trolley (cf. DE-GM 80 33 352).

The disadvantage of this known dredger is that when Lifting a relatively large dead load on the hoist comes into effect because the gripper makes up about a third of the load to be lifted.

This results in a high energy consumption when lifting and the The drive units of the hoist must be dimensioned accordingly large.

The invention is based on the object of a dredger of the designated type for the greatest possible lifting of the gripper weight when lifting to worry about the burden.

This object is achieved according to the invention in that at the a counterweight is suspended on one side of the cross member, which is connected via a rope is connected to the gripper in an opposite lifting and lowering movement.

An advantageous embodiment is that the rope with connected to the retaining thread of the hoist and wound in the opposite direction to the gripper rope is.

It is also advantageous that a pull rope of the trolley drive attached to one side of the trolley on the opposite side to the counterweight is.

It is also proposed that in a four-rope grab operation with a closing winch and a holding winch, the rope of the counterweight on the holding winch is windable.

It is also advantageous that with a self-propelled equipped trolley the rope of the counterweight over another pulley on Cross beam to the opposite side of the beam with another pulley and is led to the trolley.

Another advantageous embodiment is that the Counterweight divided and each partial weight suspended from one side of the cross member and in hydraulic gripper operation with a four-rope winch with the closing winch or the retaining thread is connected.

The invention has the essential advantage that the hoist for a lower output can be designed, which is particularly important for large lifting distances, which are up to 100 meters in such dredgers, of great importance is.

The invention is illustrated in the following description with reference to in The exemplary embodiments illustrated in the drawings are explained in more detail. 1 such a floating dredger in elevation, FIG. 2 is a plan view of FIG. 1, FIG another embodiment of such an excavator in a simplified representation in elevation, FIG. 4 is a plan view of FIG. 3, fig. 5 shows another embodiment of the excavator in a simplified representation in elevation, F i g. 6 a plan of F i g. 5, -F i g. 7 shows an additional embodiment in elevation, FIG. 8 a floor plan from F i g.

7, fig. 9 shows a final embodiment of the excavator in elevation and FIG G. 10 is a plan view of FIG. 9.

The dredger shown in the drawings has a floating body 1, on which various superstructures are arranged, or a cross member on carriers 2 3 is supported, on which a travel arm 4 for a trolley 5 is arranged. the The trolley 5 is provided with a hoist 6 which has a retaining thread 7. At the retaining thread 7 is suspended from a gripper 8, the gripper 8 via a rope 9 can be raised and lowered.

On the retaining thread 7 a rope 10 is wound in the opposite direction, which is guided at one end of the cross member 3 over a pulley 11 and a counterweight 12 is supported, the rope 10 being attached to the counterweight via a pulley 13 12 is guided on the cross member 3 and attached to a bracket 14.