DE3515224A1 - LIFTING DEVICE - Google Patents

Description

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Attorney File 34 382 British Nuclear Fuels pic Cheshire, England

Lifting device

The present invention relates to a lifting device and in particular such a lifting device for the * operation is capable in a limited space, which has a limited head space.

In the nuclear industry, the transport of irradiated nuclear fuel involves loading the fuel into one Gefäb with itself, as well as arranging the vessel in a transport container. The container can be at one end have removable closure part and can at its opposite end with a lifting device such be provided that, when the container is vertical, the vessel is lifted into the container by means of the lifting device and can be lowered out of this. Since such activities often occur in places that one have only limited head space, it is desirable to make the lifting device as compact as possible and the overlap or crossing of the rope or ropes of the lifting device during the

(089) 988272-74 fax machine. (089) 983049 Bank accounts Bayer Vereinsbank Muncnen 453100 (BuZ 70020270)

Avoid winding and unwinding activities.

According to the present invention, a lifting device has a hollow cylinder which is longitudinal in the axial direction a drive shaft is displaceable and rotatable together with this, the cylinder having a spiral groove in its Has outer surface for receiving a rope or wire rope, this groove with a complementary, fixed part cooperates to produce a screw connection with the cylinder, and wherein the rotation of the cylinder through the shaft causes the axial displacement of the cylinder along the shaft to and to effect unwinding operations so that the rope remains in the same axial position relative to the cylinder.

As a result, the rope remains in the same position relative to the cylinder and the axial displacement of the cylinder causes the rope to follow the spiral groove in the cylinder during winding and unwinding.

The invention will be further described by way of example and with reference to the accompanying drawings, in which:

1 shows a schematic view of a partial section through part of a lifting device is and

Figure 2 is section A-A in Figure 1.

A lifting device has a hollow cylinder 1 which is attached to a shaft 2 which is intended to rotate is stored in bearing arrangements 3 which are attached to a support part 4. The support part 4 can be an end closure or cover for a transport container for receiving nuclear fuel. Wave 2 is through suitable couplings connected to a drive motor,

which is attached to the support part 4 in the same way. In Fig. 1 there are two steel hawsers or ropes 5 and 6 µm wrapped around the cylinder 1 / with the ends of the cables extending away from the cylinder and through openings are guided in the support part 4 to a load inside the container. As a result of the rotation of the cylinder 1 can the load can be raised into and lowered out of the container by a removable closure at the opposite end of the container.

The cylinder 1 is designed with two spiral grooves 7 and 8 for receiving the respective cables 5 and 6. the Spiral grooves cooperate with guide rollers 9 and 10, which are mounted on annular support brackets 11 and 12, respectively which are firmly attached to the support part 4. For example, each bracket can have the same spacing Carry separate rollers, which are arranged around the cylinder around and with the spiral groove are engaged.

As can be seen from Fig. 2, the shaft 2 has a square cross-section, and the cylinder 5 is on mounted on the shaft by means of linear bearing assemblies 13. The bearing assemblies 13 are arranged in pairs, wherein each pair is carried in a housing 14 which is fixedly supported on the cylinder 1, and each bearing arrangement is in engagement with a corresponding side of the square shaft 2. The cylinder is through this coupled for rotation with the shaft and is axially displaceable along the shaft.

In Fig. 1, the cylinder is shown in an end position, the cables are wrapped around the cylinder and are arranged in the spiral grooves. The actuation of the Antricb.smotors to threaten the shaft 2 causes the

BATH ORIGINAL

Cylinder to rotate; this causes the cylinder to become axially along the shaft 2 as a result of the bearing arrangements 13 and the screw connections between the Spxralnuten and the guide rollers 9 and 12 are formed. Thus, when the cylinder moves to the right in Fig. 1, the cables 5 and 6 are off their location around the cylinder. The counter-rotation of the shaft 2 causes the axial displacement of the Cylinder in the opposite direction for winding the cables around cylinder 1.

During winding and unwinding, the cables 5 and 6 follow the grooves in the cylinder and wind themselves helically around the cylinder without intersecting each other. The position of each steel cable leaving the cylinder remains constant both during the winding and during the unwinding activity.

Although two groups of guide rollers are used in the illustrated embodiment, the axial displacement to effect, the same effect can also be achieved by having only one set of guide roles used, for example the roles 9.

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Claims (4)

Expectations 1. Lifting device, characterized by a hollow cylinder (1) running along a drive shaft (2) is displaceable in the axial direction and rotatable with it, the cylinder (1) having a spiral groove (7) has in its outer surface for receiving a rope (5), wherein the groove (7) with a complementary, fixed part (9) cooperates, which forms a screw connection with the cylinder, and wherein the rotation of the cylinder through the shaft causes the axial displacement of the cylinder along the shaft to the up and down To effect unwinding activities while the rope remains in the same axial position relative to the cylinder. 2. Lifting device according to claim 1, characterized in that that the screw connection has at least one group of guide rollers (9) which are rotatable * (089) 988272-74
Telex 524560 Swan d B / WA Facsimile (089) .983049 KaIIe Infotec 6350 Gr. II + III Bank accounts Bayer Vereinsbank Munich 453100 (BLZ 70020270) Hypo-Bank Munich 4410122850 (BLZ 70020011) Swift Code HYPO DE MM attached to a solid, ring-shaped handle (11) and are engageable with the groove in the cylinder. 3. Lifting device according to claim 2, characterized in that the guide rollers (9) of the group or each group are arranged with the same angular distance around the cylinder (1). 4. Lifting device according to any one of the preceding claims, characterized by the attachment to the end closure (4) a container for holding nuclear fuel.