Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-12-11
1992-05-19
Echols, P. W.
Metal working
Method of mechanical manufacture
Assembling or joining
29446, 29450, 29451, 29241, B23P 1904
Patent
active
051135701
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and to an apparatus for drawing in and pulling through tubular elastic belt straps into and through support roller stations arranged along a conveying path.
The drawing in and pulling through of tubular, flat belt straps (roller belts or belt bands or tubular conveyor belts) into and through support roller stations is connected with considerable difficulties which increase with increasing length of the conveying path. Such belt straps are drawn in manually with the use of a multitude of helpers attempting to hold the belt in its rolled-up shape. Since the belt strap which is shaped into a tube was manufactured as a flat belt strap, it tends to open in the unguided regions between the support roller stations. The forces required for this--in the circumferential direction on the one hand and in the longitudinal direction on the other hand--are considerable. It has been found, however, that in spite of the multitude of helpers, damage to the belt edges cannot be avoided when they are guided through the individual support roller stations since a new threading process must be performed in front of every support roller station.
SUMMARY OF THE INVENTION
It is the object of the invention to design a method and an apparatus with which the drawing in and pulling through of tubular, initially flat belt straps into and through support roller stations is simplified, with this being possible without greater effort with only a few helpers or even by machine.
This is accomplished with respect to the method in that the belt straps, before they are drawn into the support roller stations, are shaped into a tube which has a smaller diameter than the operating diameter, and they are maintained in this state while they are being pulled through the support roller stations. Due to the reduced diameter of the tube compared to the operating diameter, the respective belt strap to be pulled in can be brought through the individual support roller stations without problems and without greater efforts. Preferably, the belt straps are held in the reduced diameter state by an externally acting force, particularly a constant force, so that the overlapping belt edges are no longer able to escape from this fixed position. Damage to the belt edges during passage through the support roller stations is thus almost excluded.
According to a further idea of the invention, the belt straps are pulled through the support roller stations with the aid of a pulling means such as ropes or the like which have been guided previously through the support roller stations. Preferably the pulling force of the pulling means (rope) generates or maintains a tension to act on the circumference of the belt straps that have been shaped into a tube.
In the region of the respective reversal stations, the belt straps are opened up again, with the respective tubular belt strap being relaxed in the circumferential direction. Thereafter, the straps are reversed, for example around a reversal drum, whereupon the then flat belt strap is again shaped into a tube as already described and is brought in this state (reduced diameter) through return support roller stations for returning the belt strap.
In order for the pulling of the belt and/or net to be facilitated in the region of the shaping station, it is further proposed to introduce a sliding agent here, such as, for example, talcum or the like since a sliding friction (metal/rubber) exists in this region.
The drawing in and pulling through of the belt strap may be performed manually as well as by machine. In the latter case a winch, for example, winds up the rope while the belt strap is moved in the longitudinal direction. This measure is preferred, in particular, for longer conveying paths.
With respect to the apparatus, the problem is solved by a nozzle-like device having a decreasing diameter and being arranged in front of the first support roller station when seen in the direction of pulling. A chamber including a tensioning means which acts in the circu
REFERENCES:
patent: 3001270 (1961-09-01), Friedman
patent: 3110093 (1963-11-01), Johnson
patent: 3171193 (1965-03-01), Bowden
patent: 3193432 (1965-07-01), Baines
patent: 3360894 (1968-01-01), Sharman et al.
patent: 3429422 (1969-02-01), Yoshimura
patent: 3601940 (1971-08-01), Simon
patent: 4723653 (1988-02-01), Engst
Bryant David P.
Echols P. W.
O & K Orenstein & Koppel Aktiengesellschaft
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