EP0028365A2 - Lifting device for transporting containers - Google Patents

Abstract

The previously known hoists for transporting containers provided with trunnions with radioactive substances could not be used for containers of different sizes without major conversions and conversions. Conversions are no longer necessary for a hoist that consists of a crane hook mount, a torsion body and two crossbeams with stop tabs for the container support pins, whereby the connection between the crane hook mount and the torsion body is made via spindle linkages that rigidly connect one crossbeam to the torsion body and the other crossbeam is pendulum suspended on the torsion body, the stop tabs are infinitely displaceable and pivotally attached to the crossbars about the vertical axis, and catch hooks are attached to the pendulum suspended crossbar.

Description

The invention relates to a hoist for transporting containers provided with trunnions in a horizontal position, in particular transport containers with radioactive substances in nuclear engineering facilities, essentially consisting of a crane hook mount, a torsion body and two crossbeams with stop tabs for the container support spigots.

It is known that hoists are used to dispose of nuclear plants of nuclear fuels in order to handle containers, in particular fuel element transport containers, in a horizontal position.

Here hoists are used, which are each specially designed for one or two types of containers of similar construction. These hoists consist essentially of a crane hook mount, a torsion body and crossbeams with the stop tabs for the container support pins. These Hoists are essentially characterized in that they have four lugs Anschla ^g, which can be spread by means of hydraulic pumps to enable an abutting against normally four containers pin.

With these hoists it is possible to handle containers with different journal center distances, but mechanical changes must be made before changing containers. Likewise, containers of different geometries, weights and specific shock absorbers cannot be handled without retrofitting, since the center of gravity of these hangers can not be stepless, but only by changing tabs. It is therefore necessary in many cases to move the heavy stop straps and to move the main crane used in order to ensure that the straps hit the container properly.

In special cases, the horizontal transport of the containers is carried out using shackles and ropes, although the disadvantage is that they no longer meet the latest safety standards.

DE-OS 2 528 532 describes a device for securing loads on crane systems with a redundantly arranged cable suspension, which, however, no longer corresponds to the current state of safety requirements.

Furthermore, hoists are used, the stop plate links of which have two degrees of freedom, but the second degree of freedom is only used for the purpose of attaching the plates to the container pins.

It is also known (DE-OS 2 637 843) to equip hoists with additional equipment to protect them against falling containers. However, fall protection is a very complex construction that must be provided on site in addition to the hoist and only secures the container from falling during transport in a vertical position. However, transport in its horizontal position is unsecured.

DE-OS 2 364 928 describes how loads of a general type can be handled in a defined inclined position. However, hoists of this type cannot be handled due to their size in the lock area of a nuclear facility. In addition, no precautions have been taken with such hoists to ensure the absolutely necessary stability in the event of failure of a link plate.

It was therefore an object of the present invention to find a hoist for transporting containers provided with trunnions in a horizontal position, in particular transport containers with radioactive materials, consisting of a crane hook receptacle, a torsion body and two trusses with stop tabs for the container support spigot. This hoist should be able to be used without modification or retrofitting for containers with different focal points, should not cause a fall situation in the event of a link link failure, and should also ensure easy handling, including in the narrow lock area of nuclear facilities.

This object was achieved according to the invention in that the connection between the crane hook receptacle and the torsion body takes place via a spindle linkage, which rigidly connects one crossbeam to the torsion body, the other crossbar is suspended on the torsion body, the stop plates can be moved continuously and pivoted about the vertical axis to the Trusses are attached and catch hooks are attached to the pendulum suspended crossbar.

The inventive hoist different container types can adjustable stop tabs are struck, and the natural tendency of the container to be compensated as a result of its center of gravity above that also infinitely variable adjustment on the crane hook receiving information on the continuously ver _T.

The redundancy of the sling gear, which is necessary in the event of incorrect operation or failure of a strap link to prevent the container from falling, is achieved via the specially designed torsion body with damping links. who are able to safely absorb the dynamic forces that arise.

Figures I and VII schematically show two exemplary embodiments of the lifting device according to the invention, while Figures II to VI show construction details.

The lifting device according to the invention essentially consists of a crane hook receptacle (38) and a torsion body (1) with cross members (2, 3) attached to it.

The torsion body (1) is designed, for example, as a flat box-shaped body (1), which is made torsionally rigid in its interior with bulkhead plates. It is usually a welded construction made of sheet steel, which has a welded cross-beam (3) on one side and a pendulum-suspended cross-beam (2) on the opposite side. The fixed crossmember (3), like the pendulum crossmember (2), is designed as a welded hollow profile with web plates, the upper and lower belt plates advantageously being connected by means of web plates.

At the ends of the two traverses ^{q and} pivotally mounted arms (9) are attached as swivel arms which can be swiveled sideways about a bolt in the swivel bearing (10) with a defined angular deflection.

On the head part of these swivel arms, the stop tabs (4) are freely suspended by means of spherical bearings (11). The stop tabs (4) are provided in the lower area with the openings for receiving the container support pins (24). Trap plates (23) are arranged above (Figure III). For locking purposes, these latch plates (23) are provided with sliding bolts which bring about a positive locking with the container support pins (24) and ensure safe handling of the containers (15).

To initiate the swiveling process, the swivel arms (9) are preferably driven in pairs with a drive spindle (20), the central bearing (32) of which is attached to the torsion body (1), via a chain-driven handwheel (33).

A lever (34) is welded to the hollow shaft of the swivel arms (9) at the upper end, via which the lever linkage connected by means of the lock nut (35) transmits the force.

The crane hook receptacle (38) is fastened to inserted supporting bolts (7) via welded-in upright web plates of the torsion body (1).

This crane hook receptacle (38) consists of support straps (5) standing vertically and displaceably mounted in support bolts (7), and spacer tubes (8) as well as from latches (6). The spacer tubes (8) are flanged to the support brackets (5), the latch brackets (6) are mounted on one side in pivot bolts (12) and on the other side releasably connected with sliding bolts (13).

Using a spindle linkage (25), the support brackets (5) can be moved onto the support bolts (7) by means of carriers.

The pendulum-suspended traverse (2) is mounted on the torsion body (1) via a support bolt, wherein it rests in a slot (14) as a bearing point.

As a result of the possible pendulum movement of the pendulum traverse (2) around the bearing point (14), it strikes the torsion body (1) at stop points (36 or 37). Shock absorbers (17) and (18) made of plastically deformable materials are interchangeably attached here (Figure II). Catching hooks (16) are fastened to the pendulum traverse (2) by means of trunnions (19).

The lifting device according to the invention serves, above all, to receive and transport fuel element transport containers in a horizontal or in a defined inclined position that deviates from the horizontal.

For this purpose, a crane hook is positively attached to the crane hook holder (38). The latch bracket (6) is the pivot pin for inserting the hook (12) can be swiveled vertically upwards. When lowering the crane hook, the halyard brackets (6) are brought into the closed position by means of the hook weight. This position is then locked using sliding bolts (13). Due to the movability of the crane hook receptacle (38) on the support bolts (7), the different centers of gravity of the transport containers (15) are compensated for.

The interchangeable spacer tubes (8) connect the brackets (5) to each other and establish the distances required for the respective crane hook.

The torsion body (1) transmits the forces to the opposite stop side by absorbing torsional forces. In the event of a failure of a control bracket (4), it absorbs the forces arising from the container load and ensures that the remaining three stop brackets (4) hold the container (15) in place. The crossbar (2), which is suspended from the elongated hole bearing point (14) by means of bolts, compensates for all tolerances and inaccuracies in the hanger and on the container and enables a statically determined load distribution.

Since this traverse (2) oscillates around the bearing point (14), it strikes the torsion body (1) after the free passage has been exceeded at the attachment points (36 or 37).

Replaceable, plastically deformable shock absorbers (17 and 18) are attached at these points in order to allow this striking to take place without damaging the cross members (2) or the torsion body (1). Here. the distance between one shock absorber (17) and its attachment point (36) is smaller than the distance between the other shock absorber (18) and its attachment point (37) (Figure II).

Before striking the container support pins (24), the swivel arms (9) are spread outwards and, after the stop openings of the stop tabs (4) are in front of the container support pins (24), are pivoted inwards by means of a chain using the handwheel (33) . The pins are inserted into the bearing shells of the stop plates (4) by slightly lifting the hanger. Then the trap plates (23) (Figure III) are lowered and locked by hand with bolts so that the stripped support pins (24) cannot slide out. The different length dimensions or the different center distances of the container support pins (24) are compensated for by appropriate inclination of the stop tabs (4) via the spherical plain bearings (11).

As a result of the construction of the hoist according to the invention. a container crash is prevented even if one link link fails.

The design of the torsion body (1) and the dimensioning of the stop tabs (4) also make it possible to open a struck transport container to hold two diagonally opposite stop tabs. There is redundancy here, which offers a significant increase in safety compared to conventional hoists.

Figure II shows the safety gear with the safety hook (16) attached to the trunnion (19) of the pendulum traverse. The damping elements (17 and 18) attached to the pendulum cross member (2) and to the torsion body (1) with their attachment points (36 and 37) can also be seen here.

Figure III shows the stop plate construction with the joint bearing cut open (11). It shows the trap plate (33), which fixes the struck container support bolt (24) and thus the container (15) in its position.

Figure IV shows an enlarged view of the swivel arm construction. The adjustment of the swivel arms (9) via lock nuts (21) and lever linkage (22) around the swivel bearings (10) is achieved by means of the drive spindle (20).

Figures V and VI show the crane hook mounting structure schematically. The adjustment of the center of gravity is initiated via the spindle (25), the support straps (5) sliding over the support bolts (7).

A special variant of the lifting device according to the invention is shown schematically in Figure VII with a torsion beam (1) arranged along the container axis. The pendulum traverse (2), like the fixed traverse (3), lies transversely to the container axis.

In this case, however, the fixed crossmember (3) is screwed to the torsion body (1) and thus allows a further adjustment option that goes beyond the swivel ranges of the stop plates (4) (advantageous for extreme container dimensions).

The center of gravity of the hoist and container system is adjusted via a rough adjustment of the pull tabs (26) in the individual bores (27) of the supporting webs (28) and via a fine adjustment device (25) of the pull tabs (26).

The crane hook receptacle (29) also has a trap plate design for the positive connection of the crane hook. However, the width of the stop plates (4) is adjusted with the aid of a spindle system (31) via the support bolts (30) by moving the stop plates (4).

This variant according to the invention is preferably used where the spatial conditions are not extremely narrow and allow handling in front of the lock area. On the other hand, there is fiction moderate advantage in the usability of the hanger for containers with extra-wide and extra-long.

Claims (7)

1.Lifting device for transporting containers provided with trunnions in a horizontal position, in particular transport containers with radioactive substances in nuclear facilities, consisting of a crane hook mount, a torsion body and two crossbeams with stop tabs for the container support pegs, characterized in that a connection between the crane hook mount ( 38) and the torsion body (1) via spindle linkage (25), which connects a crossbar (3) rigidly to the torsion body (1), the other crossbar (2) is suspended from the torsion body (1), the stop tabs (4 ) are infinitely displaceable and can be pivoted about the vertical axis and are attached to the crossbeams (2, 3) and catch hooks (16) are attached to the pendularly suspended crossbeam (2). 2. Lifting device according to claim 1, characterized in that the crane hook receptacle (38) consists of support straps (5) and latch clips (6) which can be displaced on support bolts (7). 3. Hoist according to claims 1 and 2, characterized in that interchangeable spacer tubes (8) are attached between the support straps (5) of the crane hook receptacle (38). 4. Device according to claims 1 to 3, characterized in that the distance between the one shock absorber (17) of the pendulum traverse (2) and its attachment point (36) is smaller than the distance between the other shock absorber (18) and its attachment point ( 37), and the bearing point (14) is designed as an elongated hole. 5. Hoist according to claims 1 to 4, characterized in that the stop tabs (4) are attached to swivel arms (9) which can be adjusted in pairs by means of a manually or automatically driven spindle (20). 6. Hoist according to claims 1 to 5, characterized in that the stop tabs (4) are fastened to the swivel arms (9) by means of articulated bearings (11). 7. Hoist according to claims 1 to 6, characterized in that on the stop tabs (4) trap plates (23) for locking the container pins (24) are attached.

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