DE4012381A1 - Overhead travelling crane - has two hoist in crab usable together or separately to invert load - Google Patents

Abstract

The travelling overhead crane has a crab travelling on two rails and equipped with two hoist mechanisms. These can be operated simultaneously or independently of each other, each of them having a lifting hook. This allows inversion of a load having four opposite fixed attachment points. The load can be attached by these points to the two hooks, each of which is suspended on two falls of rope. After lifting by both mechanisms (3, 4) simultaneously, lifting continues by one only until the other is relieved of load, when its hook is detached. The load is then slewed through 180 degrees after which the hook is reattached and the load hoisted. When the two mechanisms are equally loaded, the load is lowered by them simultaneously. ADVANTAGE - Safe inversion of heavy and awkward loads.

Description

The invention relates to the use of an overhead crane with a two-rail cat, on which two at the same time or independently operated hoists are arranged, each having a load hook, for turning loads with four against each other fixed anchor points and a procedure for Turning the load using an overhead crane.

In connection with handling heavier, more unwieldy Parts, especially the turning of loads on crane systems, There are frequent reports of serious accidents occurring at Ignorance or insufficient tools are lead.

In order to be able to turn loads safely, there are already load turns devices known as accessories on the load hook can be attached to a crane system and independently from the operating device of the crane using a separate control device can be operated. To turn the load have such devices move in pairs Liche belts or the like, in which the load is inserted and turned or rotated by the movement of the straps can be.

These additional devices have the disadvantage that attached to the crane's load hook as an accessory must be and thus the permissible load for the part to be turned around the load share of the additional equipment reduce exercise. Such additional devices are also only approximately rotationally symmetrical for turning Suitable for loads.  

Loads with fixed attachment points for suspension cables and different priorities can with such Additional devices cannot be turned safely.

The invention is therefore based on the object Possibility to turn heavier, more bulky Find loads with fixed attachment points at the no additional equipment required on a crane will.

According to the invention, this problem is solved by the use of an overhead crane according to claim 1 and implementation of a Method for turning a load according to claim 2 solved.

The advantages that can be achieved with the invention are that heavy, bulky loads using a Overhead cranes can be turned without the use of additional equipment can.

An embodiment is shown in the drawing and is described in more detail below. Show it:

Fig. 1 is a traveling crane in a perspective view with no load,

Fig. 2 shows schematically the process steps for turning a load.

In Fig. 1 the bridge of an overhead crane is designated by ( 1 ). On the bridge ( 1 ) a two-rail cat ( 2 ) is arranged movable in a known manner. The two-rail trolley ( 2 ) has two hoists ( 3 , 4 ) which can be operated independently of one another and together. The hoists ( 3 , 4 ) each work with separate load hooks ( 5 , 6 ). Such overhead cranes are e.g. B. for use in foundries for transporting and emptying heavy ladles.

FIG. 2 schematically shows the individual method steps for turning a load using an overhead crane, as shown in FIG. 1.

In Figure a) of Fig. 2, the load ( 7 ) with four supporting ropes is suspended in two load hooks ( 5 , 6 ) and is evenly lifted or lifted off the ground while both hoists ( 3 , 4 ) are in operation.

Figure b) shows that the hoist ( 4 ) raises the load ( 7 ) until the hoist ( 3 ) is without load. The lifting mechanism ( 3 ) can also be relieved by simultaneously lifting or lowering the load hooks ( 6 , 5 ). If the hoist ( 3 ) is relieved, the support cables ( 8 ) are released from the attachment points ( 9 ) on the load ( 7 ), so that the load ( 7 ) on the load hook ( 6 ) of the hoist ( 4 ), as in Figure c ) can be rotated 180 degrees around the vertical. After the load ( 7 ) is rotated, the suspension cables ( 8 ) are again fastened to the free stop points ( 9 ). Tightening the hoist ( 3 ) ensures that the load ( 7 ) hovers horizontally again and both hoists ( 3 , 4 ) are loaded.

In picture d) it is shown that the load ( 7 ) is lowered to the floor while lowering both load hooks ( 5 , 6 ) at the same time.

Claims (2)

1. use of a traveling crane with double-rail trolley, on the two simultaneously or independently to be operated hoists are arranged, each have a load hook for turning loads with four fixed stops opposite each other score. 2. A method for turning loads using a traveling crane according to claim 1, characterized by the following features:

• - The load ( 7 ) is suspended with four ropes ( 8 ) starting from the four fixed attachment points ( 9 ) on two load hooks ( 5 , 6 ) so that each load hook ( 5 , 6 ) carries two ropes ( 8 );
• - The load ( 7 ) is raised simultaneously with both hoists ( 3 , 4 );
• - The load ( 7 ) is raised with one of the two hoists ( 4 ) until the other hoist ( 3 ) is without load;
• - The ropes ( 8 ) on the load hook ( 5 ) of the unloaded lifting mechanism ( 3 ) are released from the attachment points ( 9 ) on the load ( 7 );
• - The load ( 7 ) is rotated 180 degrees around the vertical on the loaded hoist ( 4 );
• - The ropes ( 8 ) on the load hook ( 5 ) of the unloaded lifting unit ( 3 ) are attached to the free attachment points ( 9 );
• - The still unloaded hoist ( 3 ) is put into operation and pulls the load ( 7 ) until both hoists ( 3 , 4 ) are evenly loaded;
• - The load ( 7 ) is lowered simultaneously with both hoists ( 3 , 4 ).