JPH0277304A - Holding system of wheel with rotary roller and horizontal spindle - Google Patents

Abstract

PURPOSE: To fix a roller to a support in the roller for holding a wheel having a horizontal shaft by providing a truncated cone-shaped part gradually enlarged at one end and a cylindrical part, and rotatably installing the cylindrical part onto the truncated cone-shaped part. CONSTITUTION: A roller 3 from which a wheel 1 is suspended is engaged in a support 4 by a truncated cone-shaped part 3". The roller 3 includes a cylindrical part 3' and the truncated cone-shaped part 3", the cylindrical part 3' is formed to cooperate with a rim of the wheel 1, a groove 7 cooperates with a protruded part of the rim, and a ring 8 cooperates with an arc-shaped part of the rim. In this disposition, removal and replacement of the roller are easy, and this is especially applicable to contaminated corrosive environments of a nuclear fuel dissolving device or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention is directed to a roller for the retention of wheels with a horizontal axis.

The invention relates more generally to a system for the retention of a wheel of this type incorporating removable fastening means to said rollers and supports.

According to the invention, an advantageous device is proposed for the retention of a wheel with a rotationally driven horizontal axis.

Wheels of this type are used, for example, in liquid treatment plants and in particular in nuclear fuel melting plants.

The fuel used in nuclear reactors is usually in the form of bundles of metal tubes, and these metal tubes contain nuclear fuel. use them,
After deradiation, these fuels are transported to a reprocessing facility and
Here it is stored and then subjected to various treatments to extract the radioactive material, which is then stored hermetically in accordance with current safety regulations to ensure the protection of humans and the environment.

The first step in the reprocessing of projectile fuel is to cut the tube containing the fuel into chunks of predetermined length. These tubing pieces are then heated to a boiling point to ensure separation of the fuel and metal parts.
Immerse in vA acid bath. The nuclear fuel dissolves in the acid, but the chunks or shells of the tubes and other metal parts do not.

Among the various melting devices known for dissolving nuclear fuel in nitric acid and making it possible to recover the shells, one in particular is known in which the nitric acid is stored in a fixed tank and the tube chunks are stored in said fixed tank. Inside, the pieces of tube are immersed in acid and introduced one after another into the buckets of a rotating bucket car, and then the undissolved shells and other parts are taken out again to be discharged outside the box.

A device of this type is disclosed in French patent FR 7930952 (publication number 2474347@).

The apparatus comprises a stationary tank for receiving a caustic liquid, a wheel having a horizontal axis supporting on its outer periphery a bucket of at least 111 , means for ejecting the crotch out of the bucket, means for rotating the wheel about its axis, and means for guiding said wheel into rotation about its axis; It is located at the top of the horizontal plane that passes through the inner wheel axle.

The guiding and holding means in these buckets consists of an O-la received on a shaft fixed to the cover of the melting device by removable fastening means, the axis of said shaft being at the height of O-la. is eccentric to the height of the cover.

The change of the rollers is carried out by the wheel front.

This is not without some inconvenience.

According to the invention, a new type of roller is proposed which intervenes in a new system of wheel retention with a horizontal axis.

Next, the present invention will be explained with particular reference to the inside of the bucket built into the nuclear fuel melting Hlff. However, for Kuriishi, it is clear that it is advantageous to apply the present invention to an 8-position rotating wheel having a horizontal axis.

According to the invention, the rollers for holding the wheels of the horizontal axis are:
a cylindrical portion provided for cooperating with the rim of the wheel, extended at one end by a progressively wider frustoconical portion, the cylindrical portion being rotationally attached to the frustoconical portion; and characterized in that the free end face of said truncated conical part lies on at least part of its inclined length or has an additional face which is inclined or tends to be inclined on at least part of its height. .

Said roller therefore has two parts, a cylindrical part and a frustoconical part, which are arranged along the same axis in extension of each other.

The cylindrical part is machined to cooperate with the wheel rim.

For example, it includes at least one circular groove in which the protrusion of the rim fits.

The cylindrical part is rotatably mounted, for example via ball bearings or roller bearings, on a truncated conical part (starting from the contact surface and gradually expanding).

The free end face of the truncated conical portion is sloped over at least a portion of its height. According to another variant of the invention, it has an additional surface that is inclined or tends to be inclined, on at least part of its height.

This feature (inclination) of the free end surface of the truncated conical part allows the fixation of the roller to the support by means of a wedge effect by contacting other surfaces of the same inclination.

The contact may be direct or via an additional surface. According to a variant of the invention, the truncated conical part of the roller can also be rounded and at least one movable articulating weight can be mounted on its free end face.

More advantageously, two movable articulating weights may be mounted symmetrically at the rear of said roller.

It is advantageous to include an additional surface that can be tilted. Since the inclination is adjustable, the additional surface can correct any angular errors.

The rear part of the roller of the invention (the free end face of its truncated conical part) is also advantageously provided with means that allow handling of said roller by remote control, especially when applied to devices operating in hazardous environments. Can be done. This is of course the case for support rollers of bucket wheels of nuclear fuel melting plants.

This type of roller is applied in contaminated and corrosive environments.

It is actually subjected to the corrosive action of nitric acid vapor.

In order to withstand said vapors, the roller of the invention is realized with known materials selected for their resistance in the glass environment.

This same corrosion resistance also allows the surface condition of the truncated cone of the roller of the invention to be optimized. More advantageously, it may have longitudinal grooves allowing air circulation.

As already explained, the invention is also directed to a wheel retention system comprising rollers as described above and means for removably attaching them to a support.

Considering the wheels of the melting device, the roller support can be integrated with the cover of the melting device.

According to the invention, the holding system is characterized in that the rollers are fixed to the support by means of truncated conical sections and that they are fixed to the support with the aid of a key. The key is mounted on a support and stops each roller by the free end face of its truncated conical portion.

According to the invention, each roller is associated with a key in the retention system of the invention.

Each key is connected to the roller by its back surface and is obliquely restrained over at least a portion of its height.

It will be recalled here that the back surface of the roller (the free end face of its truncated cone) is itself at least partially sloped or has an inclined or tiltable surface.

In order to ensure a secure stop, the key surface that is located opposite the free end surface of the truncated conical portion of the corresponding roller is itself inclined over at least part of its height. Stopping of the roller by the key is carried out by a wedge effect when the sloped parts of each part come into contact.

In the rest position of said roller, the corresponding key is mounted on the support via fixing means.

The means of fixing this key to the support of the rollers consist, for example, of two T-shaped groove parts arranged at the upper and lower ends of said key.

Said key is more advantageously mounted vertically.

For positioning on the T1 part, two pairs of journals are more advantageously provided, one in a high position and the other in a low position, sliding in an incline provided in the four-groove part.

Positioning of each key in the retracted position behind the corresponding roller is carried out by sliding said key in the fixing means to the support. More specifically, in the above modification, (1) the journal of the key slides within the slope provided in the groove component.

During this sliding, after the key has been inserted or at the beginning of its retraction, said key and the inclined portion of the corresponding roller come into contact.

The key slides through the action of a special tool. The same tool or two separate tools can be used to install or remove the key. More advantageously, means for fixing the key to the support of the roller during operation (installation and removal of the key) are integrated into the tool. Therefore, on said fixing means means are provided for positioning and retaining a key installation/removal tool. For example, a bone-shaped part can be provided in the T-groove part located at the high position of the key.

Each of the keys is configured to have a holding and/or pressing surface for the tool.

For example, a heel-like member can be provided on the back and the bottom part to facilitate the removal of the key.

A stage of this kind is more advantageously intervened when the device is operated in a hazardous environment.

Under this assumption, it was found that the rear part of the roller supports means for remote control. The same applies to the installation and removal tools.

The wheel holding device of the present invention incorporates a roller that can provide complete braking in the translational direction by incorporating a key.

The roller is easy to remove. - When the degree key is retracted, the wheel only needs to be lifted slightly in order to release the roller from its support and to be retracted by the rear of the wheel.

Other features and advantages of the invention will be explained in detail below with reference to the accompanying drawings.

FIG. 1 shows a wheel 1 for a bucket 2 rotating in a stationary tank containing boiling nitric acid.

This wheel is suspended and guided to rotate by the roller 3 of the present invention. These rollers 3 are fitted into their supports 4 by means of frustoconical sections.

This support has a conical bore for receiving the roller. A tank cover 5 is integral with the support.

The axis for rotationally driving the narrow width 1 is indicated by 6. This shaft is cover 5
The tooth width that penetrates through the bucket 2 and is integral with the wheel 1 and t=
A rotational action is applied to the drive pinion.

FIG. 2 shows the roller 3 of the invention on a larger scale.

The roller includes a cylindrical part 3' and a frustoconical part 3''. Said cylindrical part 3' is made to cooperate with the rim of the wheel 1 and includes a circular groove 7 and a projecting ring 8. Said groove 7 cooperates with the protrusion of the rim, and said ring 8 cooperates with the arcuate part of the rim.

The truncated conical part 3'' of the roller shown is truncated. On its rear side there are two movable articulating weights 9 which cooperate with the inclined parts of the corresponding keys. These weights are positioned between the two caps. The back side of said roller 3 also supports means 10 for remote control.The truncated conical part 3'' of the roller
has longitudinal grooves.

FIG. 3 does not show the key 11 that engages with the back surface of the roller to stop it. Said cooperation action is carried out more particularly at the level of the inclined surface 12 of the key 11 with respect to the said rear surface of the roller.

The key 11 is located behind the roller in fastening means provided on the support 41 of said roller. Said fastening means here consist of two T-slot parts 13, 13'.

The key 11 comprises a journal 14 for positioning in said T-slot part 13.13', more particularly in the ramp 18 provided there.

Said key 11 also includes means 15 for remote control.

The lower surface thereof has a heel member (projection) 16 used as a suppressing surface for removing the key.

Finally, on the Ti74 part 13, the key attachment is a bone (pi) for positioning and holding the tool for removal.
on) type part 17 is provided.

FIGS. 4A to 4R) illustrate the positioning of the key 11 for stopping the O-ra 3.

- Fig. 4A: Key insertion - Fig. 4B: Key positioning - Fig. 4C: Key starts acting on the rotary weight 9 - Fig. 4D
Figure: End of stop.

The key faces the back side of the roller and the gripping means 1 of the roller
It has a notch in consideration of 0.

These figures make clear the advantages of the invention.

With such an arrangement, the rollers can be easily removed and replaced.

For removal, a support-mounted jack can be used. The support is more advantageously U-shaped. It is fixed on the bone part 17 by a U-shaped arm.

The motor, through a joint, drives a linear jack that lifts the key. Pressure is applied to the heel portion 16.

For assembly, a first jack, whose support hooks onto the bone part 17, is likewise used. Jack presses the key to lower it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the back of a wheel for a bucket of a nuclear fuel melter suspended from the roller of the present invention, Fig. 2 is a perspective view of the roller of the invention, and Fig. 3 is a key (preventing translational movement of the roller). Figures 4A to 4D are schematic diagrams showing how a key can be secured to the back side of the roller of the securing means. 1...Wheel, 3...Roller, 3'...Cylindrical part, 3''...Truncated cone part, 4...Support , 11...
・・Key −. ``Mouth〔- Shikisun 1 Shiongami\Seplex

Claims (11)

[Claims] (1) A rotating roller for the holding of a wheel having a horizontal axis, a cylindrical part extended at one end by a gradually widening truncated conical part, made to cooperate with the rim of said wheel. the cylindrical portion is rotationally mounted on the frustoconical portion, and the free end surface of the frustoconical portion is on or above at least a portion of its sloped height; Rotary roller for holding a wheel with a horizontal axis, characterized in that it has an additional surface that is inclined or tiltable on at least one part of the roller. 2. The rotary roller according to claim 1, wherein at least one movable articulating weight is mounted on the free end surface of the truncated conical portion. (3) The rotating roller according to claim 1 or 2, wherein means for remote control is provided on the free end surface of the truncated conical portion. (4) The rotating roller according to any one of claims 1 to 3, wherein the truncated cone portion has a vertical groove. (5) A retention system for a wheel having a horizontal axis (e.g., a wheel incorporated in a processing device supporting at least one bucket on its outer periphery and configured via an etchant), the device comprising: a roller; , means for removably fixing said roller to a support, said roller being as defined in any one of claims 1 to 4, wherein said roller is attached to said support by said truncated conical portion. fitted, and further characterized in that the removable fixing means of said support comprises a key, said key having a horizontal axis attached to said support and adapted to stop each said roller by the free end face of its truncated conical portion; Wheel retention system. (6) A surface of the key facing the free end surface of the truncated conical portion of the corresponding roller is inclined for at least part of its height, and stopping of the roller by the key is performed by a wedge effect. 6. A wheel retention system with a horizontal axis according to claim 5. (7) that each key is mounted vertically on the support of the roller in two parts having T-slots integral with said support and located in the high and low parts of said key; Retaining system for a wheel with a horizontal axis according to claim 5 or 6. (8) Each key has two pairs of journals, one in the high part and the other in the low part, which are machined on said T-slot part when the key is positioned to stop the corresponding roller. 8. Retaining system for a wheel with a horizontal axis according to claim 7, characterized in that it slides in a tilted slope. 9. Horizontal according to any one of claims 5 to 8, characterized in that the means for fixing each key on the support of the roller includes means for positioning and retaining a tool for attaching and removing the key. A wheel retention system with an axle. (10) The horizontal shaft according to any one of claims 5 to 9, wherein each of the keys is formed to provide a support and/or a pressing surface to a tool for attaching and removing the key. Has wheel retention system. (11) A retention system for a wheel with a horizontal axis according to any one of claims 5 to 10, characterized in that each key includes means for remote control.