DD130927B1 - CIRCUIT ARRANGEMENT FOR DRIVING CRANES WITH A SEGAGING EQUIPMENT - Google Patents

Description

For this 1 page drawing

Field of application of the invention

The invention relates to a circuit arrangement for the drive of cranes with Seegangsfolgeeinrichtung.

The application is provided for cranes in which multiple motors must be driven to perform the Seegangsfolgeewegungen.

Characteristic of the known technical solutions

In known devices separate drive units for driving the motors are provided for the control of the Seegangsfolgebewegungen. This leads to a considerable increase in the cost of the system, and, when used on ships of particular importance, to an increased space and space requirements.

Object of the invention

The aim of the invention is to carry out the control of the drive of the motors for cranes with Seegangsfolgeeinrichtung so that is to get along with respect to conventional crane drives with a minimum of additional drive units.

Explanation of the essence of the invention

The invention has the object to develop a circuit arrangement for driving the motors for cranes with Seegangsfolgeeinrichtung in which the necessary for the control of the drive of Seegangsfolgeeinrichtung services are taken from the existing drives for the normal crane control.

According to the invention this is achieved in that the pumps of the crane operation in stationary crane engines for the Seegangsfolgebewegungen on directional valves an engine of Seegangsfolgeeinrichtung associated with a pressure relief valve act in heaves and the pump of the auxiliary system alternately with a motor of the follower via a directional control valve or with a Motor of the empty hook is operatively connected via a pressure relief valve.

The invention will be explained below using an exemplary embodiment.

In the accompanying drawing, a hydraulic circuit diagram of the embodiment according to the invention is shown.

When handling goods with hydraulic jib cranes, lifting, luffing and rotating movements must be carried out. Due to the superimposition of the movements, the separately acting lifting, luffing and slewing drives are each to be driven by their own drive pumps. If the ship tipping cranes are also equipped with seaway sequencing devices, separate drives with drive pumps have also been used in the known designs for the seaway sequencing devices. It will now be shown how according to the invention in the Seegangsfolgebewegungen the coupling of the individual drives of the Seegangsfolgeeinrichtung with the drive pumps of the luffing, the slewing and the auxiliary system takes place, so that no additional drive pumps are required compared to the normal crane design.

a) Operation without swell follower

When goods are handled, the pumps 1 operate on the engine 2 and the pump 3 on the engine 4. During operation, the directional control valves 5 and 6 are closed. The pump 7, a gear pump, works to produce filling oil for rinsing and replenishing the system.

b) Transfer of goods that are taken over by sea or by ship when the waves swell

In addition to the operation according to variant a, but with stationary hoist, the pump 7 is switched by electrical switching of the directional control valve 8. The filling oil, which is not required when the hoist is stationary, acts on the motor 9 for the subsequent movement of the hook, the brake 10 being released in the direction of hoisting at constant pressure. The pressure level is determined by the pressure relief valve 11.

c) Transfer of goods handed over to objects floating in swell

By electrical switching the operation is switched to variant a so that the distance constant of the load is ensured to the acquiring object.

About the motor 12 a follower rope for striking on the receiving object is gefiert. For this purpose, the directional control valves 8 and 13 are switched over, the brake 14 is released and the brake 10 is set and the motor 12 is acted upon by the directional valve 13 from the pump 7 in the direction of the fins. The oil flow of the pump 7 is used due to the technologically not operated luffing and luffing in this operation. After striking the follower part on the floating object, the engine 12 is reversed in Hieven via the directional control valve 13 and the follower rope is taut. To transfer the following movement to the load, the follower drum is coupled to the drum for initiating the swell following movement of the load rope.

The required power for the Seegangsfolbei movement of the load is applied by connecting the pumps 1 and 3 to the motor 15.

The shutdown of the luffing gear and the slewing gear, these are technologically due to the Seegangsfolgeewegung out of service, is achieved by opening the directional control valves 16 and 17 and the motor 15 is applied in the direction Hieven, the follower of the following rope drum, which is coupled to the motor 12, forces the Fierbewegung the load and pumps the flow of oil through the pressure relief valve 18.

The check valves 19; 20; 21; 22; 23 have the task to release the flow of oil in the respective predetermined direction.

Documents considered:

DE-OS 2019317 (B63B, 27/10)

DE-PS 1144900 (35C, 1/08)

SU 378372 (B66D, 1/52); 466145 (B63B, 27/10)

GB 1253010 (B660.1 / 50)

Claims (1)

-1 patent claim: Circuit arrangement for the drive of cranes with swell following means, characterized in that the pumps (1; 3) of crane operation with open directional control valves (5; 6) via directional control valves (16; 17) a motor (15), which a Druckbegrenzungsventil (18) assigned is acted upon in Hieven and the pump (7) of the auxiliary system for the Seegangsfolgeewegung is alternately operatively connected to a motor (9) with an associated pressure relief valve (11).