BE495040A

BE495040A - Device for dismantling boiler tubes

Info

Publication number: BE495040A
Authority: BE
Inventors: De Poray M C Kuczewski
Priority date: 1948-10-11
Filing date: 1950-04-08
Publication date: 1950-08-01
Also published as: FR1010725A

Description

  

  APPAREIL POUR LE DEMONTAGE DES TUBES DE CHAUDIERE=

  
Le démontage des tubes de chaudière et notamment des tubes Field présente de grosses difficultés et entraîne souvent des détériorations des tubes. Ceux-ci, qui sont emmanchés dans des portées coniques de la plaque tubulaire de la chaudière, sont en effet généralement démontés en les chassant à coups de masse appliqués sur l'extrémité du tube située du côté du foyer. Il est donc nécessaire, pour cette opération, de pénétrer et de travailler à l'intérieur du foyer ce qui est malaisé et pénible et le fait de frapper sur le culot des tubes risque de les détériorer.

  
L'appareil suivant l'invention permet de remédier à ces inconvénients et de procéder à l'arrachage des tubes d'une part en agissant sur leur extrémité fixée dans la plaque tubulaire donc facilement accessible par trou d'homme habituel et d'autre part en utilisant l'action d'une force progressivement croissante ce qui évite tout risque de détérioration.

  
Cet appareil est remarquable notamment en ce qu'il comprend une entretoise destinée à prendre appui sur la plaque tubulaire de la chaudière et traversée par une tige cylindrique pouvant se déplacer axialement dans l'entretoise sous l'action d'un dispositif de commande prenant appui sur ladite entretoise,, la tige se terminant par une portée conique et étant entourée par un équipage mobile par rapport à elle et comprenant une série de secteurs cylindriques à surface interne conique appliqués élastiquement contre la tige et dont la paroi extérieure comporte des saillies en forme de griffes. 

  
Suivant un mode de réalisation la tige cylindrique est filetée à son extrémité du côté de l'entretoise et son dispositif de commande est constitué par un écrou vissé sur elle et prenant appui sur la face extérieure correspondante de l'entretoise.

  
D'autres caractéristiques résulteront de la description qui va suivre.. 

  
Au dessin annexé:



  DEVICE FOR DISASSEMBLING BOILER TUBES =

  
The dismantling of boiler tubes and in particular Field tubes presents great difficulties and often leads to damage to the tubes. These, which are fitted into the conical bearing surfaces of the tube plate of the boiler, are in fact generally removed by driving them out with sledgehammers applied to the end of the tube located on the side of the fireplace. It is therefore necessary, for this operation, to penetrate and work inside the hearth, which is difficult and painful and the fact of knocking on the base of the tubes risks damaging them.

  
The apparatus according to the invention makes it possible to remedy these drawbacks and to tear off the tubes on the one hand by acting on their end fixed in the tube plate and therefore easily accessible through the usual manhole and on the other hand. by using the action of a progressively increasing force which avoids any risk of deterioration.

  
This device is remarkable in particular in that it comprises a spacer intended to bear on the tube plate of the boiler and traversed by a cylindrical rod able to move axially in the spacer under the action of a control device bearing support. on said spacer, the rod terminating in a conical bearing surface and being surrounded by a mobile assembly relative to it and comprising a series of cylindrical sectors with a conical internal surface applied elastically against the rod and the outer wall of which has shaped projections of claws.

  
According to one embodiment, the cylindrical rod is threaded at its end on the side of the spacer and its control device consists of a nut screwed onto it and bearing on the corresponding outer face of the spacer.

  
Other characteristics will result from the description which follows.

  
In the attached drawing:

Claims

Figure 1 is a vertical section of the device according to the invention; Figure 2 is a horizontal section along line 2-2 of Ligure 1.

Referring to the drawing ,. 1 designates the tube plate of the

boiler and 2 a field tube fitted, by a conical seat 3 in said <EMI ID = 1.1>

yant at its lower part on the plate 1 and pierced at its upper part with a hole 5 for the passage of a threaded rod 6 retained by a nut 7.

The threaded rod 6 is extended downwards by a cylindrical part 8 and

height rod 4 and, at its lower part, an annular projection 13. On the projection 13 are hooked by, grooves 14., four segments 15 whose face

internal has a conical shape corresponding to that of the rod 9 and the face

external is provided with annular projections 16 in the form of turned claws

to the top. Segments 15 are elastically applied against the rod

views to this end in the outer wall of said segments 15, -

The operation is as follows:

the sleeve 10 at the top so that the claw segments 15

therefore a minimum external diameter is introduced said crew in the

tube 2. When it is fully lowered, nut 7 resting on the spacer

descends, the segments 15, coming into contact with the conical rod 8, move apart and rest by their claws 16 on the internal wall of the tube 2. In

then screwing the nut 7, the rod 6,8,9 is brought upwards and its conical end 9 simultaneously develops two very important forces: one

the tube 2 and the other tending to lift the assembly and tear off the tube 2

off plate 1.

We see that we do this on the easy to reach end

tubes 1 and on the other hand by applying a progressive pulling force to them eliminating any risk of deterioration of the tubes.

To separate the device from tube 2, all you have to do is unscrew

the nut 7 and push in the rod 6 and the segments 15 automatically resume, 'under the action of the springs 17 their position of minimum diameter allowing the moving assembly to exit the tube.

Of course, the invention is in no way limited to the embodiment shown and described which was chosen only by way of example. It is

control the rotation of the nut 7 or replace this nut by any other control member making it possible to exert on the rod 6 a significant force along its axis.

CLAIMS,

particular of Field tubes, characterized in that it comprises a spacer

intended to bear on the tube plate of the boiler and crossed by a cylindrical rod capable of moving axially in the spacer under the action of a control device bearing on said

spacer, the rod ending in a conical seat and being surrounded

by a mobile unit relative to it and comprising a series of cylindrical sectors with a conical internal surface applied elastically against the rod and whose external wall comprises protrusions in the form of

claws. 2. - Apparatus according to claim 1, characterized in that the set of claw segments is connected at its upper part to a sleeve surrounding the rod and provided at its end on the side of the spacer with an operating member allowing to move it along the rod.

the cylindrical rod is threaded at its end on the side of the spacer and its control device consists of a nut screwed onto it and bearing on the corresponding exterior face of the spacer.

4. - Apparatus according to claim 1, characterized in that the elastic return device of the claw segments is constituted by annular springs, for example coil springs housed in annular grooves of the outer wall of said segments.