HUP0700358A2 - Lifting hook arrangement for heavy hollow structural parts, particularly for movement and fastening toroid-shaped transformens - Google Patents

Description

PUBLICATION COPY -

Friday 07 08 358

Lifting hook arrangement for moving and securing heavy hollow components, especially toroidal transformers

The invention relates to a lifting hook arrangement for moving and securing heavy hollow components, in particular toroidal transformers, which has a lifting member with at least one hook arranged along or near the centerline of said component, and the lifting member is rigidly connected to the component,

The maximum weight of machine elements or components that can be moved by human power is usually regulated by regulations. Components weighing more than the specified weight can only be placed in their installation location or lifted out during repairs using lifting equipment 10. The lifting equipment can be connected to the components via eyes, lugs or lifting hooks attached to the components. For lifting hollow or cylindrical components, it is often necessary to mount several lugs or hooks on the component, as there is no surface at the center of gravity of the component where the lifting hook can be mounted 15. Placing the lifting hook outside the center of gravity results in the component tipping over, which results in unnecessary swaying and difficulties in positioning and orientation. A specially designed lifting arrangement must be used to lift components whose outer surface is fundamentally not suitable for load-bearing. Such a lifting arrangement must meet several requirements at once: it must be safe, not damage components with sensitive surfaces, be quickly connected and disconnected, and after lifting and positioning, it must be easily removed, even from the environment where the component is assembled with other components.

A structural solution for lifting an electrical transformer with a sensitive surface is presented in US Patent No. 4,649,640. Lifting lugs are attached to the upper surface of the iron core of the transformer installed in a stationary position by means of bands or tires, and the crossbars holding the lifting lugs are cast with synthetic resin, thereby increasing the load-bearing capacity of the lifting lug.

The described solution is only of limited use in the case where the iron core is surrounded by windings everywhere, since the windings only allow the lifting devices to be fixed on a surface that is more vulnerable than the iron core. For example, in the case of toroidal transformers, exactly such a difficulty arises, with the addition that in the typical installation position of larger toroidal transformers, there is no component surface at all in the center of gravity or in the line of gravity of the component. Generally, cylindrical and

Bözse/C/doc/ms/l 03039 Lifting hook

-For 2-cavity parts, there is a difficulty in securing the lifters, especially if the part has a sensitive surface.

Another disadvantage of using lifting lugs is that they do not provide any solution for securing the transformer in the device where it can be inserted using the lifting lugs, so the lifting and securing tasks are separate. Lifting the object is necessary when installing it in and removing it from the electrical device that receives it. If the object is difficult to grasp by hand, or if the object is heavy and requires space for the hand holding the object where this is not possible due to the presence of other components, then installing and removing the object is seriously difficult and endangers other components of the device.

The object of the invention is to create a lifting hook arrangement that enables the safe lifting of heavy, hollow objects and their fixation in the desired location using a single lifting element located in or near the center of gravity of the object.

As a solution to the set task, I have created a lifting hook arrangement for moving and fixing heavy hollow components, in particular toroidal transformers, which has a lifting member with at least one hook arranged along or near the center line of said component, and the lifting member is rigidly connected to the component, and according to the invention, the hook has a downward opening, and the hook is formed at the upper end of a vertical shaft, at least one vertical axis orientation bushing is located near the lower section of the shaft, which has a vertical through hole open at both ends, and the shaft and the orientation bushing lead at least partially through the cavity of the component and are fixed to each other and to the component.

A preferred embodiment has a lifting member 25 with two parallel legs bent in a U-shape and two orientation bushings, each of the legs has a hook formed at the upper end, and the lower ends of the legs opposite the hooks are connected by a cross member, which has holes for receiving and abutting the lower ends of the orientation bushings.

In this case, it is advantageous if an insert plate is located under the cross member, which is fixed to the cross member, and the insert plate has holes 30 in places corresponding to the holes in the cross member and the lower ends of the two orientation sleeves fit into these holes.

The fastening technology is simplified if the size and design of the insert plate closes the cavity of the component from below, and the cavity is filled with a synthetic resin binder up to a specified height from the insert plate and the hook opening downwards.

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The use of the -3Αζ lifting device requires that there is a separate lifting piece that can be hooked into the hooks of the hook lifting device in a form-fitting manner, which is provided with two hanging elements with an opening facing upwards, and the said specified height is at least the same as the height of the hanging elements of the lifting piece. This is necessary so that when hanging, the lifting piece can be hung into the hooks without the bottom of the lifting piece being obstructed by the resin filling the cavity from freely inserting it.

In the most common applications, the component to be lifted and fixed is a toroidal transformer, and the arrangement is form-fittingly fixed in its central toroidal cavity by pouring in synthetic resin.

The invention is illustrated in more detail with the help of the following figures, where:

Figure 1 shows the arrangement of the lifting hook, the

Figure 2 shows the assembly of the lifting hook components,

Figure 3 shows the counterpart of the lifting hook, the

Figure 4 shows the view of the guide bushing,

Figure 5 shows a cross-section of the guide bushing,

Figure 6 shows an enlarged view of one end of the guide bushing,

Figure 7 shows an enlarged view of the other end of the guide bushing,

Figure 8 shows an exploded view of the components of the lifting hook,

Figure 9 shows a lifting hook placed in a toroidal transformer.

Figure 1 shows the design of the lifting hook and its associated structural elements. The lifting hook 11 and the orientation bushings 13 required for attachment and precise insertion are attached to the inside of the large, heavy, hollow component 12 to be removed and installed, e.g. a toroidal transformer. The attachment can most conveniently be done by casting with a casting material 15, e.g. synthetic resin. The flow of the casting material 15 is prevented by an insert plate 14 belonging to the structure and placed from below, which also serves as a washer plate for the component 12.

Figure 2 shows the assembly of the components of the lifting hook, and Figure 3 shows the design of the lifting counterpiece. It should be noted that the reference numbers of the individual components have been chosen in accordance with the number of the figure being discussed, therefore the same element is shown in different figures with a different reference number in the first digit. The parts of the lifting hook in the state before pouring are shown in Figure 2. The orientation bushes 23 fit into the hole of the insert plate 24 through the hole of the lifting hook 21, in this way they orient and hold the lifting hook 21 during pouring (and later during use). The upper end of the orientation bushes 23 is located so low that after pouring the <·’·Λ Ζ’Η·

The ends of the -4 bushings are still visible from the casting material, but the shoulder part 36 of the counterpiece 35 shown in Figure 3 can be slid through without hindrance between the hook part 25 of the lifting hook 21 and the upper end of the bushings 23. The counterpiece 35 is attached to the lifting device (not shown in the drawing) for lifting the component by means of a hole 37, so that the components can be mounted or removed in series by quickly hooking and unhooking the counterpiece 35. Since the shoulder part of the counterpiece 35 can only be unhooked downwards after being hooked into the hook part 25 of the lifting hook 21 due to the collision of the surfaces, the component can be safely lifted in without the risk of slipping out or tipping over.

Figure 4 shows a view of the guide bushing, Figure 5 shows a section of the guide bushing, while Figures 6 and 7 show enlarged details of the two ends of the guide bushing. Grooves 42 are formed on the outer surface of the guide bushing 41 to ensure the flow of the casting material, thereby creating a safe and economically implemented positive connection between the casting material and the guide bushing. This is important because, as can be clearly seen in Figure 1, the lifting hook transfers the load from the mass of the component to the casting material via the guide bushing 41 and its own horizontal lower surface, and then the casting material transfers the load to the inner wall of the cavity of the component, preferably by forming a positive connection between the inner wall and the cavity. Figure 5 shows a section of the guide bushing. The end of the orienting sleeve 41 shown in Figure 6 is provided with a recess 51, which is located in one axis with a hole 52. The recess 51 serves to receive the head of the fixing screw (not shown), while the hole 52 orients the fixing screw so that the fixing screw can be screwed in immediately during installation. The other end of the orienting sleeve 41 shown in Figure 7 positions the orienting sleeve 41 in the axis of a threaded fixing sleeve (not shown) by fitting the surfaces of the holes 53 or 54. Since the axis of the hole 52 coincides with the axis of the recess 51 and the holes 53, 54, the fixing screw can always be screwed into the single-axis threaded fixing sleeve immediately.

Figure 8 shows an exploded view of the components of the lifting hook. The orienting bushing 82 and the insert plate 81 enclose the base part 85 of the lifting hook 83. The rim of the lower end of the orienting bushing 82 rests on the upper surface of the base part 85, while the lower cylindrical end of the orienting bushing 82 fits into the hole of the insert plate 81. In addition to the fit of the lower cylindrical ends of the orienting bushes 82, a fixing screw 84 serves to securely connect the lifting hook 83 and the insert plate 81. This is of particular importance when making the casting, because the insert plate 81 closes the inner opening of the hollow part from below, so that the casting material cannot flow out.

-5Α 9. Figure 9 shows a three-dimensional view of a lifting hook cast into a toroidal transformer 91. The toroidal transformer 91 is characterized in that its central opening narrows from the upper surface towards the central part and widens again from the central plane outwards. The lifting hook described earlier and indicated by the reference number 92 in Figure 8 is cast into this central opening in such a way that the insert plate 24 is in the lower plane of the toroidal transformer 91 or slightly higher than it. The casting resin therefore covers the section of the internal opening on both sides of the central plane. It follows that the axial forces acting on the lifting hook or the bushings can be transferred to the transformer by the solidified casting resin, regardless of the direction of the forces, by contacting it over a large surface area. Due to the positive connection, no separate fastening elements or special surface design are required, and the toroidal transformer is easily and inexpensively mounted. The advantage of the solution is that the forces act in the centerline of the transformer that represents the load, which provides optimal safety when lifting or mounting. If the toroidal transformer is to be placed inside a device, and in order to utilize the space, there is not enough space around the installed toroidal transformer, then with the solution according to the invention, both installation and removal can be solved simply, without touching or endangering adjacent nearby components. For mounting in the device, it is assumed that a threaded bushing or spindle protrudes from the device at a location corresponding to the axis of the two orientation pins, and when the toroidal transformer is brought into place with the help of the hook, in the final stage of lowering, the bushing or spindle protruding from the bottom upwards is introduced by the wider starting bore ends of the two orientation pins, and the structure can be lowered into place. The toroidal transformer is then secured to the housing using a screw or threaded bushing through the upper hole of the alignment pin. Lifting is done in the reverse order, first the fastening must be released, then the insert plate must be hooked into the lifting hook, and then lifting can be done easily and without endangering adjacent components.

Although the solution according to the invention is most preferably used for removing and installing a toroidal transformer, it is equally suitable for installing and removing any other large, heavy component (e.g. multi-phase column transformers or smaller devices).

Claims (6)

-6Patent claims 1. A lifting hook arrangement for moving and securing heavy hollow components, in particular toroidal transformers, comprising a lifting member with at least one hook arranged along or near the centerline 5 of said component, the lifting member being rigidly connected to the component, characterised in that the hook has a downward opening and the hook is formed at the upper end of a vertical shaft, at least one vertical axis orientation bushing is arranged near the lower section of the shaft, which has a vertical through hole 10 open at both ends, and the shaft and the orientation bushing extend at least partially through the cavity of the component and are secured to each other and to the component. 2. A lifting hook arrangement according to claim 1, characterized in that it has a lifting member with two parallel legs, bent in a U-shape, and two orientation bushings, a hook is formed at the upper end of each of the legs, and the lower ends of the legs opposite the hooks are connected by a cross member, on which there are holes for receiving and abutting the lower ends of the orientation bushings. 3. Lifting hook arrangement according to claim 2, characterized in that an insert plate is located under the cross member, which is fixed to the cross member, and the insert plate has holes in places corresponding to the holes of the cross member and the lower ends of the two orientation bushings 20 fit into these holes. 4. A lifting hook arrangement according to claim 3, characterized in that the size and design of the insert plate closes the cavity of the component from below, and the cavity is filled with a synthetic resin binder up to a specified height from the hook opening, between the insert plate and a predetermined height. 25 5. Lifting hook arrangement according to claim 4, characterized in that it has a separate lifting piece that can be positively hooked into the hooks of the hook lifting device and has two hanging elements with upwardly facing openings, and furthermore, said defined height is at least the same as the height of the hanging elements of the lifting piece. 6. Lifting hook arrangement according to claim 1, characterized in that the component 30 is formed by a toroidal transformer, and the arrangement is positively fixed in the central toroidal cavity thereof by pouring in the synthetic resin.