Patent Publication Number: US-2011048463-A1

Title: Spraying device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the benefit of priority of German Application No. 102009039585.7, filed Sep. 1, 2009. The entire text of the priority application is incorporated herein by reference in its entirety. 
     FIELD OF THE DISCLOSURE 
     The disclosure relates to a spraying device of the type used for cleaning containers in beverage bottling operations. 
     BACKGROUND 
     A spraying device of this type is known from DE 43 30 335 A1. The known spraying device is employed for bottle cleaning systems in which a conveyor conveys the bottles head first, i.e. with the opening facing downwards, through the cleaning system and over the spraying device. The spraying device contains a plurality of nozzles which track the spray jet along the conveying direction of the bottles by cam control. The nozzles are the outlet openings of through bores through a nozzle shaft that is rotatably seated on a manifold containing a through bore in communication with a spraying channel and with the nozzle shaft. The nozzle shaft rotates over the manifold bore, so that every time the nozzle bore is aligned with the manifold bore, a spray jet is generated which enters the bottle through the opening of the bottle and cleans it inside. 
     The outside cleaning of the bottles is either effected by various immersion baths, or by liquids striking from above, i.e. onto the bottom of the bottle, in particular in the rinsing stage. However, it showed that with this outside cleaning, the mouth of the bottles cannot always be cleaned in a satisfactory manner. 
     SUMMARY OF THE DISCLOSURE 
     It is thus an aspect of the disclosure to improve the outside cleaning of containers, in particular in the region of the opening mouth. 
     By the inventive departure from spraying from the upper side, it is achieved in a constructively simple manner that the mouth of containers can be better cleaned as it can be optimally reached by the spray jet from the bottom. 
     The combination of inside cleaning with outside cleaning by means of combined internal and external nozzles is particularly advantageous. Internal and external nozzles are preferably seated on one common nozzle shaft and can thus be driven by means of one single apparatus, preferably a cam control. For optimal cleaning, two external spray nozzles are preferred which preferably operate laterally reversed with respect to each other. 
     Prefabricated nozzle pairs of one external and one internal spraying nozzle each, which are each provided on a common nozzle shaft, are particularly simple as to their construction and manufacture. If these spray nozzle pairs are then arranged to be laterally reversed with respect to each other, two spray jets directed to the interior of the container and two spray jets directed to opposite outer surfaces result. 
     By the method according to the disclosure, essentially better outside cleaning is achieved in a constructively simple manner. Here, outside cleaning can be even further improved by adjusting the spray jet from the external spray nozzle such that it reaches beyond the axial length of the container, falls back from above onto the bottom of the container and then, following the contour of the bottle&#39;s outer wall, flows downwards again, so that opposite water streams are also formed in the region of the mouth and have a good cleaning effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be described more in detail below with reference to the drawings. In the drawings: 
         FIG. 1  shows a view of a spraying device according to the disclosure in the conveying direction, 
         FIG. 2  shows a side view of the spraying device according to the disclosure along the section II-II, 
         FIGS. 3   a  to  3   e  show various spraying stages while a container is passing through the spraying device. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     From  FIGS. 1 and 2 , one can take a first embodiment of a spraying device  1  which forms a part of a cleaning system  2  for containers  3  , where here bottles are represented. The cleaning device  2  contains a conveyor  4  which moves through the system in the conveying direction F. The conveyor  4  contains holders  5  for the containers  3  by means of which the containers  3  are transported head first, i.e. with the opening  3   a  facing downwards. In the represented embodiment, the holders  5  are bottle baskets. 
     The spraying device  1  contains a plurality of nozzles  6  which are located adjacent transversely to the conveying direction F such that the spray jet can reach the container  3  from each of the nozzles  6 . 
     The nozzles  6  contain at least one external spray nozzle  6   a  and at least one internal spray nozzle  6   i.  The external spray nozzle  6   a  and the internal spray nozzle  6   i  are embodied as through bores  7  in a nozzle shaft  8  which is rotatably mounted in a bearing sleeve  9  seated on a manifold  10 . The manifold  10  contains through bores  11  in a manifold chamber  10   a,  the through bores  11  being embodied and arranged such that they become aligned with the nozzle bores  7  while the nozzle shaft  8  is rotated. Preferably, the diameter of the manifold bores  11  is larger than that of the nozzle bores  7 , so that the nozzle bores  7  remain connected to the manifold chamber  10   a  over a certain area of the angle of rotation. The manifold chamber  10   a  is in communication with a manifold channel  13  via a supply opening  12 , the manifold channel  13  supplying all spraying means. In the desired area of the angle of rotation, the bearing sleeve  9  is provided with an opening  14  through which a spray jet can be emitted. 
     In the represented embodiment, one internal spray nozzle  6   i  and one external spray nozzle  6   a  each are arranged on a common rotating shaft  8 . The rotating shaft  8  is driven to be rotated, preferably via a cam control  14 . The cam control  14  contains cams  15  which are actuated by a catch  16  of the holder  5  while the containers  3  are passing. Thereby, the cam control  14  is rotated and rotates the rotating shaft  8 . By the rotation of the rotating shaft  8 , the nozzle bores  7  are aligned and misaligned with the through bores  11  of the manifold  10  and are thereby supplied with spraying liquid, whereby each of the nozzles  6  generates a spray jet  17 . The nozzles  6  that are seated on a common nozzle shaft  8  can be identical or different with respect to the angular position in the circumferential direction around the rotating shaft  8  and/or also with respect to their angular position in the axial direction to the rotating shaft  8  and/or the arrangement next to or below the trajectory of the opening  3   a.  However, in any case, one of the nozzles, the external spray nozzle  6   a,  should generate a spray jet  17   a  directed to the outer surface of the container at or above the mouth, and the internal spray nozzle  6   i  should generate a spray jet  17   i  that can enter the mouth  3   a.    
     In the represented embodiment, two spray nozzle pairs  60 A and  60 B are provided which are each embodied with a nozzle shaft  8 , an internal spray nozzle  6   i,  an external spray nozzle  6   a  and a cam control  14 . The spray nozzles  6   a,    6   i  are arranged to be spaced apart transversely to the conveying direction F, however, they have the same angular orientation. For saving space, both pairs are arranged one behind the other and laterally reversed in the conveying direction F ( FIG. 2 ), so that each of the external nozzles  6   a  of the two pairs  60 A and  60 B strokes over one of the two opposite container halves. The second internal nozzle  6   i  of one of the two pairs  60 A,  60 B is not absolutely necessary, but it can be embodied such that it cooperates, for example, with the second internal spray nozzle in a manner described in DE 43 30 335 A1. If a holder by means of which the containers  3  can be rotated is used, only one pair of an external and internal spray nozzle is required. 
     Depending on the type and dimension of the containers to be cleaned, the dimensions of the nozzles can also be varied, in the represented embodiment, the distance between the nozzle bores on a nozzle shaft is approx. 20 mm. Furthermore, it is possible that one or all nozzles  6  consist of two nozzle bores  7  which are arranged offset with respect to each other by 90° around the axis of the nozzle shaft  8 , so that per rotation of the nozzle shaft, not only two, but four spray jets can be generated. 
     The nozzles can be actuated in many different ways; one embodiment will be illustrated below with reference to  FIGS. 3   a  to  3   i . In the following figures, the internal jets  17   i  are marked with solid lines, and the external jets  17   a  are marked with dot-dash lines. 
       FIG. 3   a  shows the beginning of the spraying of a container  3  that is entering the spraying device  1 . For the sake of simplicity, only one spray nozzle pair  60 A of two spray nozzles  6   a,    6   i  situated one behind the other perpendicular to the drawing plane are shown here. While the container  3  enters the spraying device  1 , it is first hit by external jets  17   a  into which the container  3  runs. The spray jet  17   a  hits the outer wall of the container just above the opening  3   a  and flows upwards over the outer side of the container  3 . The power of the spray jet is adjusted such that the spray jet  17   a  reaches over the axial length of the container  3  and passes over the bottom, indicated by a cloud of droplets  18 . The droplets fall back to the bottom of the container  3  and then flow down at its outer wall until they drip off in the region of the opening  3   a  and thus rinse off all released contaminations. The container  3  moves further in the conveying direction F until it reaches a point where the opening  3   a  can be reached by the internal nozzle  6   i . Then, the internal nozzle  6   i  starts to spray and directs the jet inside the container  3 . Cleaning of the inner wall begins. The external spray jet  17   a  is maintained and runs essentially in parallel to the internal spray jet  17   i  in the represented embodiment. 
     In  FIG. 3   c , the central position is reached in which the spray jets  17   i  and  17   a  are directed essentially vertically upwards, where the cloud of droplets  18  of the external spray jet  17   a  is largest. 
     In  FIG. 3   d , the internal spray jet  17   i  is on the verge of leaving the opening  3   a,  where it is advantageously switched off subsequently. The external jet  17   a  can, as is shown in  FIG. 3   e , still remain active. 
     The operating process of the spraying device with two spray nozzle pairs  60 A,  60 B is analogous, however, as the pairs  60 A,  60 B are offset by a certain distance in the conveying direction F, the actuation intervals are also offset by a suited control. 
     In variation to the described and drawn embodiment, in case of non-rotating containers, two external spray nozzles can be optionally combined with one single internal spray nozzle on a common rotating shaft to achieve a complete all-around cleaning, moreover, the spray jet  17   a  and  17   i  can spray synchronously. The control of the shown spray nozzles can be effected by other means, moreover, spray nozzles of a different construction can be employed.