WO1993001009A2 - Automatically monitored device for scraping off solid deposits or scale from rotating surfaces - Google Patents

Automatically monitored device for scraping off solid deposits or scale from rotating surfaces Download PDF

Info

Publication number
WO1993001009A2
WO1993001009A2 PCT/IT1992/000075 IT9200075W WO9301009A2 WO 1993001009 A2 WO1993001009 A2 WO 1993001009A2 IT 9200075 W IT9200075 W IT 9200075W WO 9301009 A2 WO9301009 A2 WO 9301009A2
Authority
WO
WIPO (PCT)
Prior art keywords
scale
scraper
scraping
members
electrical
Prior art date
Application number
PCT/IT1992/000075
Other languages
French (fr)
Other versions
WO1993001009A3 (en
Inventor
Fulvio Ottofaro
Silvano Lonardi
Franca Lonzardi
Luciano Righetti
Original Assignee
Glaxo S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glaxo S.P.A. filed Critical Glaxo S.P.A.
Publication of WO1993001009A2 publication Critical patent/WO1993001009A2/en
Publication of WO1993001009A3 publication Critical patent/WO1993001009A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/083—Removing scrap from containers, e.g. removing labels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers

Definitions

  • This invention relates to an automatically monitored device for scraping off solid deposits or scale from rotating surfaces, and in particular it relates to a scraper device cooperating with the metering disc of packaging machines in the pharmaceutical industry in making an electrical monitoring circuit.
  • Some devices are already known, comprising in general blades or knives adapted to remove, by scraping, the scale possibly deposited on the outer surfaces of rotating members like discs or cylinders.
  • said scraper devices have a drawback in that they must be exactly in registry relative to the confronting rotating surface and therefore they may cause serious damages due to friction if the surfaces are not perfectly circular or perfectly centered.
  • a resilient member like for instance a metal spring, which allows said blade to adjust to the possible manufacturing or positioning inaccuracies.
  • this approach would make it .possible to subject the scraper blade only to a continuously constant force, independent upon the nature and consistence of the scale to be scrap ⁇ ed off.
  • One of the main steps characterizing the secondary production of antibiotics is the apportioning of anti ⁇ biotic powders to suitable sterile bottles. Said operat- ion is performed by means of known metering machines in ⁇ cluding a conveyor belt for feeding empty bottles at the base of a steel metering disc. Above the disc there is mounted a powder feeding hopper. The metering disc is provided with a certain number of adjustable metering cavities wherein, by means of a suitable air suction and ejection mechanism, there is formed a number of tablets having a metered volume. After the tablets have been ejected by compressed air, they are blown directly in the underlying bottle right at the moment when it is positioned under the metering disc cavity. The bottles full of antibiotic are then carried along by the conveyor and they are forwarded to further packaging operations. The critical point of these packaging machines is locat- ed at the coupling between the feeding hopper and the
  • metering disc because, in order to prevent the powder from escaping, between the hopper and the metering disc there is mounted a group of four seals, among which the two side ones are made of teflon and arc shaped in order to assure a side sealing, while two stainless steel blades mounted upstream and downstream of the hopper discharge opening provide sealing in the disc rotating direction. While this sealing arrangement gives on the one hand an effective sealing against the escape and loss of antibiotic powders, on the other hand it makes it impossible to prevent that, between the two teflon arc shaped side sealing members and the surface of the metering disc, where the powder tends to set in that it cannot fall immediately in the underlying cavities, there is a scale formation responsible in the long run for particulate pollution of the antibiotics.
  • the device has the drawbacks and disadvantages mentioned above referring to the possible rotating disc centering inaccuracies.
  • the metering disc may suffer unrecoverable surface damages.
  • the device according to this invention replaces the ZANASI metering machine stiff scraping blade but it should be apparent that it may be used for other types of similarly operated metering machines.
  • the device of this invention will be described more particularly in the following referring to the attached drawing in which:
  • Figure 1 shows a schematic side elevational view of a rotating disc metering machine provided with a blade scraper known in the art
  • Figure 2 shows a schematic front elevational view of the machine shown in Figure 1 , provided with the inventive
  • FIG. 3 is an enlarged perspective view of the scraper device according to this invention.
  • Figure is a schematic longitudinal sectional view of the device shown in Figure 3.
  • the metering machine shown in Figures 1 and 2 substant- ially comprises an upper hopper 1 having a small barrel
  • Inventive device 8 comprises a box-like frame including two mirror-like identical halves 9, 9 ' fastened to each other by means of two transverse screws; in each half 9, 9' of the box-like frame there is removably received a scraper member 10, 10' whose chisel-like free end is urged outwards by a coil spring 11 coiled around a shank shaped extension of scraper 10, 10', and whose pushing
  • the two scraper members 10,10' are mounted at an angle within inner cavity 12 whose purpose is to collect the scale fragments removed by the chisel shaped ends of scrapers 10, 10'.
  • Cavity 12 is communicated with the outside through two rectangularly shaped openings located above and below the two scraper members 10, 10', at a concave contoured wall provided to match dosing disc 4 cylindrical circumferential surface.
  • an air flow suction In order to remove wastes deriving from the scale scrap ⁇ ed off the surface of disc 4 by scrapers 10, 10', there is provided an air flow suction and, for said purpose, inner cavity 12 is communicated for flow with a suction device (not shown), through a duct 13.
  • the pair of scrapers are inserted in a single electrical circuit substantially comprising, in addition 'to said scrapers, an electrical power source and a ohmmeter, while the circuit is closed through the contact of the pair of scraper members 10, 10' with metering disc 4 metal
  • metering disc When , due to particular reasons , the scrapers cannot make it to thoroughly remove the scale off the. metering disc , the contact with said disc metal surface is progressively jeopardized by the build up of scale waste whereby the electrical resistance increases and a signal is given by said ohmmeter which may be a conventional ohmmeter with a moving indicator or for instance by a digital multiple meter adapted to measure , with a selected frequency , the resistance value and to continuously send said value to a computer which proces ⁇ ses the received data in order to stop automatically the device on reaching an established value of electrical resistan- ce, or to send a feedback signal to the process operator, which signal enables him to take action for cleaning operations and putting back into service the device.
  • said ohmmeter which may be a conventional ohmmeter with a moving indicator or for instance by a digital multiple meter adapted to measure , with a selected frequency , the resistance value and to continuously send said value to a computer which proces ⁇ ses the received data in order to
  • metal scraper members 10, 10* are electrically connected, by means of suitable lead with respective connecting terminals 14, project- ing out of box-like frame 9, 9' -to which the pair of leads of the control circuit are to be connected. It is pointed out herein that the device described above is designed in such a way as to be easily assembled and disassembled into the components thereof because, at the end of any production run or production batch a careful
  • washing and sterilizing operation has to be performed at 121 °C temperature.
  • the materials chosen, i.e. polytetra- fluoroethylene for parts 9, 9' of the box-like housing and stainless steel for the pair of scraper members 10, 10' completely satisfy the operational requirements owing to their resistance to the deformation and to the sterilization temperature.
  • neither the device frame nor the various components have shown any deformation, in particular concerning the seats wherein the scraper memb ⁇ ers are received.
  • the machining of the cavity is carefully controlled in order to prevent formation of sharp edges which might cause buildup of deposits from the powder scraped off the metering disc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Basic Packing Technique (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Abstract

A device for scraping off scale from rotating surfaces comprising a pair of metal scrapers (10, 10') projecting out of an insulating housing (9, 9') having a suction channel (12, 13) therein, said scraper means being electrically connected in series with an electrical power source and with an ohmmeter. The purpose of the device is to clean from undesirable scale the metal metering disc of a tablet-making machine in the pharmaceutical industry.

Description

AUTOMATICALLY MONITORED DEVICE FOR SCRAPING OFF SOLID DEPOSITS OR SCALE FROM ROTATING SURFACES This invention relates to an automatically monitored device for scraping off solid deposits or scale from rotating surfaces, and in particular it relates to a scraper device cooperating with the metering disc of packaging machines in the pharmaceutical industry in making an electrical monitoring circuit.
Some devices are already known, comprising in general blades or knives adapted to remove, by scraping, the scale possibly deposited on the outer surfaces of rotating members like discs or cylinders. However, said scraper devices have a drawback in that they must be exactly in registry relative to the confronting rotating surface and therefore they may cause serious damages due to friction if the surfaces are not perfectly circular or perfectly centered. In order to obviate to this draw¬ back it would be possible to replace the rigid fastening arrangement of the scraper blades with the application of a resilient member, like for instance a metal spring, which allows said blade to adjust to the possible manufacturing or positioning inaccuracies. However, this approach would make it .possible to subject the scraper blade only to a continuously constant force, independent upon the nature and consistence of the scale to be scrap¬ ed off.
It is an object of this invention to provide a device adapted to remove, by scraping, solid deposits from rotating surfaces, wherein the force to which said device subjects the rotating surfaces to be treated is provided by resilient pusher means, and the degree of cleaning is automatically monitored through an electri- cal circuit closed by the device against the rotating surface.
One of the main steps characterizing the secondary production of antibiotics is the apportioning of anti¬ biotic powders to suitable sterile bottles. Said operat- ion is performed by means of known metering machines in¬ cluding a conveyor belt for feeding empty bottles at the base of a steel metering disc. Above the disc there is mounted a powder feeding hopper. The metering disc is provided with a certain number of adjustable metering cavities wherein, by means of a suitable air suction and ejection mechanism, there is formed a number of tablets having a metered volume. After the tablets have been ejected by compressed air, they are blown directly in the underlying bottle right at the moment when it is positioned under the metering disc cavity. The bottles full of antibiotic are then carried along by the conveyor and they are forwarded to further packaging operations. The critical point of these packaging machines is locat- ed at the coupling between the feeding hopper and the
metering disc because, in order to prevent the powder from escaping, between the hopper and the metering disc there is mounted a group of four seals, among which the two side ones are made of teflon and arc shaped in order to assure a side sealing, while two stainless steel blades mounted upstream and downstream of the hopper discharge opening provide sealing in the disc rotating direction. While this sealing arrangement gives on the one hand an effective sealing against the escape and loss of antibiotic powders, on the other hand it makes it impossible to prevent that, between the two teflon arc shaped side sealing members and the surface of the metering disc, where the powder tends to set in that it cannot fall immediately in the underlying cavities, there is a scale formation responsible in the long run for particulate pollution of the antibiotics. In order to prevent this scale from forming it was thought to install a cleaning device for the metering disc cylindrical surface. Then for instance in the ZANASI AM-300 metering machine, used by the Applicant for packaging antibiotic powders, there is mounted a scraper member comprising a stainless steel blade rigidly fastened to the machine frame in such a way that the free end thereof contacts the cylindrical disc surface
scraping off unwanted scale therefrom.
However the device has the drawbacks and disadvantages mentioned above referring to the possible rotating disc centering inaccuracies. In certain cases the metering disc may suffer unrecoverable surface damages.
The device according to this invention replaces the ZANASI metering machine stiff scraping blade but it should be apparent that it may be used for other types of similarly operated metering machines. The device of this invention will be described more particularly in the following referring to the attached drawing in which:
Figure 1 shows a schematic side elevational view of a rotating disc metering machine provided with a blade scraper known in the art;
Figure 2 shows a schematic front elevational view of the machine shown in Figure 1 , provided with the inventive
device;
Figure 3 is an enlarged perspective view of the scraper device according to this invention, and
Figure is a schematic longitudinal sectional view of the device shown in Figure 3.
The metering machine shown in Figures 1 and 2 substant- ially comprises an upper hopper 1 having a small barrel
2 holding the antibiotic powder to be metered. Underneath upper hopper 1 there is provided a lower hopper 3 wherein a rotatingly mounted flap operates to support the meterd outflow of the powder in the lower clockwise rotating metering disc 4, as shown in Figure 2. Under¬ neath metering disc a conveyor belt 5 moves linearly in the direction of the arrows in Figure 2, and it carries bottles 6 to be filled with the tablets ejected in a vertical direction by metering disc 4. In the lower portion of the metering machine, as shown in Figure 1, there is provided a scraper means 7 in tight abutment with metering disc 4 cylindrical surface. The modification introduced in the same metering machine according to this invention provides, as an alternative to scraper 7, an improved device 8 substantially adapted to perform the same functions as scraper 7 without its
drawbacks. Inventive device 8 comprises a box-like frame including two mirror-like identical halves 9, 9 ' fastened to each other by means of two transverse screws; in each half 9, 9' of the box-like frame there is removably received a scraper member 10, 10' whose chisel-like free end is urged outwards by a coil spring 11 coiled around a shank shaped extension of scraper 10, 10', and whose pushing
force is controlled by means of a coaxial screw provided at the inner end of member 10, 10'.
As it is best shown in Figure 4,the two scraper members 10,10' are mounted at an angle within inner cavity 12 whose purpose is to collect the scale fragments removed by the chisel shaped ends of scrapers 10, 10'. Cavity 12 is communicated with the outside through two rectangularly shaped openings located above and below the two scraper members 10, 10', at a concave contoured wall provided to match dosing disc 4 cylindrical circumferential surface. In order to remove wastes deriving from the scale scrap¬ ed off the surface of disc 4 by scrapers 10, 10', there is provided an air flow suction and, for said purpose, inner cavity 12 is communicated for flow with a suction device (not shown), through a duct 13.
In order to continuously monitor the automatic operation of the production process, and to take proper action when the degree of cleanliness provided by scraper memb- ers 10, 10' is no longer satisfactory, the pair of scrapers are inserted in a single electrical circuit substantially comprising, in addition 'to said scrapers, an electrical power source and a ohmmeter, while the circuit is closed through the contact of the pair of scraper members 10, 10' with metering disc 4 metal
surface.
When , due to particular reasons , the scrapers cannot make it to thoroughly remove the scale off the. metering disc , the contact with said disc metal surface is progressively jeopardized by the build up of scale waste whereby the electrical resistance increases and a signal is given by said ohmmeter which may be a conventional ohmmeter with a moving indicator or for instance by a digital multiple meter adapted to measure , with a selected frequency , the resistance value and to continuously send said value to a computer which proces¬ ses the received data in order to stop automatically the device on reaching an established value of electrical resistan- ce, or to send a feedback signal to the process operator, which signal enables him to take action for cleaning operations and putting back into service the device. In order to enable them to be effectively inserted in the resistance measuring circuit metal scraper members 10, 10* are electrically connected, by means of suitable lead with respective connecting terminals 14, project- ing out of box-like frame 9, 9' -to which the pair of leads of the control circuit are to be connected. It is pointed out herein that the device described above is designed in such a way as to be easily assembled and disassembled into the components thereof because, at the end of any production run or production batch a careful
washing and sterilizing operation has to be performed at 121 °C temperature. The materials chosen, i.e. polytetra- fluoroethylene for parts 9, 9' of the box-like housing and stainless steel for the pair of scraper members 10, 10' completely satisfy the operational requirements owing to their resistance to the deformation and to the sterilization temperature. In fact, following a number of sterilizing operations, neither the device frame nor the various components have shown any deformation, in particular concerning the seats wherein the scraper memb¬ ers are received. On the inside of the pair of components 9 and 9' the machining of the cavity is carefully controlled in order to prevent formation of sharp edges which might cause buildup of deposits from the powder scraped off the metering disc. On the inside of both parts of the pair there is provided a seat wherein the scraper member is received together with its special calibrated spring. This approach is particularly import- ant in that the metering discs have slightly different diameters due to tolerances and besides either the discs or the supporting shaft may have a certain degree of eccentricity.

Claims

CLAIMS 1. A device for scraping off solid deposits or scale from rotating surfaces, substantially comprising blade means against which the surface to be scraped rotates with friction, characterized in that said blade means are biased by elastic members against said rotating surface, thus closing an electrical monitoring circuit.
2. The device of claim 1, characterized in that said blade means comprise a pair of metal scraper members (10,10') being the terminals of said electrical monito¬ ring circuit which is closed by the contact of said scraper members (10,10') with the metal rotating surface (4) to be scraped.
3. The device of claim 1 or 2, characterized in that said elastic members are adjustable coil springs (11).
4. The device according to any previous claim, characte¬ rized in that said electrical monitoring circuit inclu¬ des an electrical resistance measuring instrument.
5. A device according to claim 4, characterized in that said scraper members (10,10') together with their respec¬ tive adjustable pusher springs (11), are received within a cavity (12,13) °f a box-like plastic material housing
(9).
6. The device of claim 5, characterized in that said cavity (12,13) is communicated with the outside through a pair of rectangular openings located above and below said scraper members (10,10'), provided in a concavely contoured wall of said box-like housing (9,9') and it is connected, at the opposite end, to an outer suction device.
PCT/IT1992/000075 1991-07-08 1992-07-07 Automatically monitored device for scraping off solid deposits or scale from rotating surfaces WO1993001009A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911878A IT1251062B (en) 1991-07-08 1991-07-08 AUTOMATIC CONTROL DEVICE FOR THE REMOVAL OF SOLID DEPOSITS OR STICKS FROM ROTATING SURFACES.
ITMI91A001878 1991-07-08

Publications (2)

Publication Number Publication Date
WO1993001009A2 true WO1993001009A2 (en) 1993-01-21
WO1993001009A3 WO1993001009A3 (en) 1993-03-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1992/000075 WO1993001009A2 (en) 1991-07-08 1992-07-07 Automatically monitored device for scraping off solid deposits or scale from rotating surfaces

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AU (1) AU2369992A (en)
IT (1) IT1251062B (en)
WO (1) WO1993001009A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029982A1 (en) 2008-06-24 2009-12-31 Schopf, Walter, Dipl.-Ing. Stabilization and maintenance device for rope tensioned carrier device for e.g. wind energy plant, has rope structures with fastening base, where repair prone stretching of rope structures is replaced by new rope structure stored at board

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB515237A (en) * 1938-06-14 1939-11-29 John Emmott An improvement in or relating to machines for planing stone and the like
US3451849A (en) * 1964-09-09 1969-06-24 Zdzislaw Unterschuetz Method of and apparatus for the descaling of metals
US4122734A (en) * 1976-09-21 1978-10-31 Hurst Richard F Label stripping machine
DE2842057A1 (en) * 1977-09-27 1979-04-05 Baruffato DEVICE FOR HERMETIC SEALING OF TWO RELATIVELY MOVING MACHINE PARTS, IN PARTICULAR OF MACHINES FOR FILLING CONTAINERS WITH POWDER OR THE LIKE.
DE3625811A1 (en) * 1986-07-22 1988-01-28 Hermann Bockhorni Device for parting off a brake lining

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB515237A (en) * 1938-06-14 1939-11-29 John Emmott An improvement in or relating to machines for planing stone and the like
US3451849A (en) * 1964-09-09 1969-06-24 Zdzislaw Unterschuetz Method of and apparatus for the descaling of metals
US4122734A (en) * 1976-09-21 1978-10-31 Hurst Richard F Label stripping machine
DE2842057A1 (en) * 1977-09-27 1979-04-05 Baruffato DEVICE FOR HERMETIC SEALING OF TWO RELATIVELY MOVING MACHINE PARTS, IN PARTICULAR OF MACHINES FOR FILLING CONTAINERS WITH POWDER OR THE LIKE.
DE3625811A1 (en) * 1986-07-22 1988-01-28 Hermann Bockhorni Device for parting off a brake lining

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029982A1 (en) 2008-06-24 2009-12-31 Schopf, Walter, Dipl.-Ing. Stabilization and maintenance device for rope tensioned carrier device for e.g. wind energy plant, has rope structures with fastening base, where repair prone stretching of rope structures is replaced by new rope structure stored at board

Also Published As

Publication number Publication date
AU2369992A (en) 1993-02-11
ITMI911878A0 (en) 1991-07-08
WO1993001009A3 (en) 1993-03-18
ITMI911878A1 (en) 1993-01-08
IT1251062B (en) 1995-05-04

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