DE2009146C3 - Excavator device for extracting sand and gravel with a grab excavator - Google Patents

Description

The invention relates to a dredging device for the extraction of sand and gravel, with one on one Gripper excavator arranged floating body, the gripper of which emanates from a cable drive Lifting and holding ropes suspended from a fixed frame and between a position above a Dredge opening in the floating body and a position above a transfer funnel on the floating body is movable back and forth in the horizontal plane.

By the German utility model 18 68 289 such an excavator device for the extraction of sand and gravel known, on whose floating body a scaffold is built, with a movable trolley and built-up hoist, which moves the gripper from the excavator opening to the transfer hopper in a horizontal position Direction moved back and forth. This design requires a more complex frame with a trolley track, a large mass to be moved with high drive effort and a correspondingly larger float. This is therefore a complex construction.

According to British patent specification 4 65 981, a mobile grab excavator is also known which has a rocker arm carries, on which there is a pulley on one side, while a counterweight on the other side is appropriate. In that version, a single-rope grab and the movement of the grab is attached from intake to discharge cannot be done horizontally. The attachment of the pulley to the The rocker arm serves to open the gripper shells cause.

The invention is based on the object of creating an excavator device in which the movements of the gripper that take place in the same horizontal plane between the excavation and unloading positions can be carried out in a structurally simple manner with little drive effort.
The solution to this problem is that on

ίο the upper end of the trestle in a vertical plane pivotable rocker is mounted in the middle, which carries roller heads at its two free ends, over which the Lifting and holding ropes are guided between the cable drive and the gripper, and that the gripper is on one The roller head of the rocker arm in the vertical arm position above the excavator opening and in the horizontal position Swing position hangs over the transfer funnel

This solution according to the invention has the advantage that the masses to be moved are very small and therefore only a small drive power is needed. In addition, there are fewer parts for driving the Swing arm are necessary than with the drives otherwise used for a boom. Because of the simple and rapid pivoting of the rocker arm, the playing times when operating the device are reduced, whereby an increase in the delivery rate is achieved.

The pivoting of the rocker can be done in various ways according to the invention, namely by

Operation of the hoist ropes, mechanically and / or electrically,

z. B. with the help of a motor and a gear transmission.

The rocker can also use hydraulic or

pneumatic drives are pivoted.

An embodiment of an excavator device according to

the invention is explained in the following description with reference to the drawing.

On a floating body 1, a trestle 2 is built at its upper end a rotatable Rocker 3 is provided which has a roller head 4 and 5 at each of its two ends. From a hoist 8 running holding ropes 6 and 9 from a shooting mechanism

Lifting ropes 7 over the two roller heads 4, 5 to one

Gripper 10.

In the drawing, the rocker 3 is used to move

a motor 11 with a gear transmission 12 is shown.

In the drawing, the gripper 10 is shown in that position where it is above a transfer funnel 13 is located, in which the conveyed material is poured, from where it is then via a screening system 14 on a conveyor belt 15 arrives to be transported away.

When the conveyor game pivots the rocker 3 down and thereby brings the gripper 10 over a Dredge opening 16 in the floating body 1, so that the gripper 10 for conveying the goods under the Water surface can be lowered. During this movement, the rocker 3 only has the horizontal one Path of the gripper 10 from the transfer funnel 13 to the excavator opening 16 in the floating body 1 or vice versa to bridge.

A stage 17 is attached to the trestle 2, whereby the assembly and then also the later Maintenance of the swing arm 3 is facilitated. In the example shown, the rocker arm 3 can rotate almost 360 ° be pivoted, so that in this case you can reach both roller heads 4 and 5 from the stage 17 and can perform maintenance.

1 sheet of drawings

Claims (4)

Patent claims: 1. Dredging device for the extraction of sand and gravel with a mounted on a floating body Grab excavator whose grab is attached by means of lifting and holding ropes emanating from a rope drive suspended from a fixed trestle and between a position over an excavator opening in the Float and a position above a transfer funnel on the float in horizontal plane can be moved back and forth, characterized in that the upper At the end of the trestle frame (2) a rocker arm (3) which can be pivoted in the vertical plane and which is mounted in the center at both of its free ends has roller heads (4 and 5) over which the lifting and holding ropes (7 and 6) guided sirxl between gripper (10) and rope drive, and that the gripper (10) on one roller head (4) of the rocker arm (3) in the vertical rocker arm position above the excavator opening (16) and in the horizontal swing arm position above the transfer funnel (13) hangs, 2. Dredging device according to claim 1, characterized in that the pivoting of the rocker (3) by operating the hoist ropes (7) 3. Dredging device according to claim 1, characterized in that the pivoting of the rocker (3) mechanical and / or electrical, e.g. B. with the help of a motor (11) and a gear drive (12) he follows 4. Dredging device according to claim 1, characterized in that the rocker (3) with the help hydraulic or pneumatic drives is pivotable