CA2193346C - A method of and apparatus for checking the volume of containers - Google Patents
A method of and apparatus for checking the volume of containers Download PDFInfo
- Publication number
- CA2193346C CA2193346C CA002193346A CA2193346A CA2193346C CA 2193346 C CA2193346 C CA 2193346C CA 002193346 A CA002193346 A CA 002193346A CA 2193346 A CA2193346 A CA 2193346A CA 2193346 C CA2193346 C CA 2193346C
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- CA
- Canada
- Prior art keywords
- container
- wall section
- connector
- casing
- volume
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3209—Details, e.g. container closure devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
- G01M3/329—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell for verifying the internal pressure of closed containers
Abstract
A connector for a container comprises a connector casing and at least one pneumatically operated elastically flexible bellows located at the casing and adapted to apply a connection to the container within limits, independently of a shape of a section of the container to be connected in a sealed manner onto the outer wall of the container.
Description
w« - 1 -A METHOD OF AND APPARATUS FOR
CHECKING THE VOLUME OF CONTAINERS
This application is a division of application Serial No. 2,043,402 filed May 28, 1991.
BACKGROUND OF THE INVENTION
Field of the Invention The parent patent relates to a method of checking the volume of containers in which a gas is fed into a volume which is correlated to the volume of a respective container and a signal which depends from the supplied amount of gas is evaluated as signal indicative of the volume of the container.
This application relates to an apparatus for checking containers.
The invention also relates to a connector for containers.
Description of the Prior Art The European Patent Specification EP-O 313 678 Bl published May 3, 1989 discloses a method in which a side of the checking regarding the tightness of containers a signal is evaluated which depends from the volume of the container being checked. A container to be checked is placed into a checking chamber wherewith the volume difference between the checking chamber and the container to be checked forms a volume which depends from or is correlated to the volume of the container. This volume is acted upon by a pressurized gas from a pre-charged storage chamber by opening a valve arranged in a connecting line, and the ratio of the pressures ahead of the opening of the valve and after the opening of the valve gives an indication of the volume of the container, this due to the decompression of the pressure from the pre-charged chamber into the checking chamber.
The drawback of this method is that due to the sudden decompression of the pressurized gas from mentioned chamber into the checking chamber relatively long time spans must elapse until transient processes of the equalizing of the pressure have been damped for instance caused at the one side by the sudden decompression of the gas and the thereby occurring uncontrollable gas flow and at the other side by the time dependent yielding of the wall of the container to be checked, as well It is additionally necessary, when proceeding from one checking to a subsequent checking to always recharge the chamber up to a preselected pressure before the subsequent checking can be initiated. This also increases the time span of a measuring cycle.
Summary of the Invention In accordance with one aspect of the present invention there is provided a connector for sealingly gripping a wall section of a substantially cylindrical part of a container, defining a container opening, comprising a connector casing to be applied around said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
In accordance with another aspect of the present invention there is provided an apparatus for checking containers, the apparatus comprising a source of pressurized gas, a connecting line extending from said source of pressurized gas to a container to be checked, said connecting A
- 2a -line comprising a connector for sealingly gripping a wall section of a substantially cylindrical part of said container, defining a container opening, said connector comprising a connector casing to be applied around said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
Brief Description of the Drawings The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Fig. la illustrates schematically of an apparatus in which the volume which is correlated to the volume to be checked is taken as the volume of a checking chamber;
A
CHECKING THE VOLUME OF CONTAINERS
This application is a division of application Serial No. 2,043,402 filed May 28, 1991.
BACKGROUND OF THE INVENTION
Field of the Invention The parent patent relates to a method of checking the volume of containers in which a gas is fed into a volume which is correlated to the volume of a respective container and a signal which depends from the supplied amount of gas is evaluated as signal indicative of the volume of the container.
This application relates to an apparatus for checking containers.
The invention also relates to a connector for containers.
Description of the Prior Art The European Patent Specification EP-O 313 678 Bl published May 3, 1989 discloses a method in which a side of the checking regarding the tightness of containers a signal is evaluated which depends from the volume of the container being checked. A container to be checked is placed into a checking chamber wherewith the volume difference between the checking chamber and the container to be checked forms a volume which depends from or is correlated to the volume of the container. This volume is acted upon by a pressurized gas from a pre-charged storage chamber by opening a valve arranged in a connecting line, and the ratio of the pressures ahead of the opening of the valve and after the opening of the valve gives an indication of the volume of the container, this due to the decompression of the pressure from the pre-charged chamber into the checking chamber.
The drawback of this method is that due to the sudden decompression of the pressurized gas from mentioned chamber into the checking chamber relatively long time spans must elapse until transient processes of the equalizing of the pressure have been damped for instance caused at the one side by the sudden decompression of the gas and the thereby occurring uncontrollable gas flow and at the other side by the time dependent yielding of the wall of the container to be checked, as well It is additionally necessary, when proceeding from one checking to a subsequent checking to always recharge the chamber up to a preselected pressure before the subsequent checking can be initiated. This also increases the time span of a measuring cycle.
Summary of the Invention In accordance with one aspect of the present invention there is provided a connector for sealingly gripping a wall section of a substantially cylindrical part of a container, defining a container opening, comprising a connector casing to be applied around said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
In accordance with another aspect of the present invention there is provided an apparatus for checking containers, the apparatus comprising a source of pressurized gas, a connecting line extending from said source of pressurized gas to a container to be checked, said connecting A
- 2a -line comprising a connector for sealingly gripping a wall section of a substantially cylindrical part of said container, defining a container opening, said connector comprising a connector casing to be applied around said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
Brief Description of the Drawings The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Fig. la illustrates schematically of an apparatus in which the volume which is correlated to the volume to be checked is taken as the volume of a checking chamber;
A
Fig. lb is a diagram illustrating on a qualitative basis the course of the pressure in the checking chamber if a substantially constant mass flow of gas is fed thereinto, for the explanation of an evaluation signal of a first variant;
Fig. lc is a diagram analogue to the diagram of Fig. lb for the explanation of a further variant of the preparation for the evaluation signal;
Fig. ld is a diagram to illustrate the mass of gas which has flown in correlation with the pressure in the gas chamber, for the illustrating of a further variant of the preparation for the evaluation signal;
Fig. le is a diagram illustrating in relation to the time axis the mass of gas which has flown since the beginning of the measuring cycle for the explaining of a further variant of the preparation for the evaluation signal;
Fig. 2 is an illustration analogue to Fig. la and of a variant in which the volume which is correlated to the volume to be checked is taken directly as the volume of a container to be checked;
Fig. 3 is an illustration analogue to the illustration of Fig. 2, showing schematically the checking of groups of containers arranged in line during the production of the containers;
Fig. 4 is an illustration of a longitudinal section through a connector for containers specifically used with the apparatus of Figs. 2 and 3 for the volume checking method and the volume checking apparatus, respectively.
Description of the Preferred Embodiments Fig. la illustrates schematically a checking chamber 1, whereby in this variant of the embodiments a closed container 3, possibly filled by its contents is placed into the chamber 1. The setting of the container 3 to be checked and having a volume V3 into the chamber l, due to which the differential volume V1 - V3 is produced in the chamber proceeds by a charging gate which can be closed in a 21933-b completely sealed manner and is not particularly illustrated.
A source 5 of pressurized gas is connected via a connecting line 7 to the chamber 1. In accordance with the schematic illustration, the source 5 allows basically a controlled setting of the mass flow m of the gas which is fed per unit of time via the line 7 to the volume V1 - V3, such as a setting to respective constant values. For this task and by example a storage tank 9 is provided for the pressurized gas and a control member 11 regulated by the through mass flow, such as for instance a constantly adjustable valve.
This extremely simple volume testing apparatus operates such as will be explained with reference to Figs. lb to le.
After the volume or container 3, respective to be tested the flow of a predetermined mass flow m of gas is set by means of the source 5 which is controlled regarding the mass flow in, for instance by the continuously adjustable valve 11. The pressure P1_3 in the volume difference V1 - V3 rises during the time span. This pressure is sensed by means of a pressure sensor 13.
Simultaneously with the beginning of the operation or opening, respective of the valve 11 a timing unit 15 is started which after a pre-settable time span T outputs or forwards further, respective the output of the pressure sensor 13 for the further evaluation and thus an evaluation signal indicative of the checking.
According to the illustration of Fig. lb the pressure arrived at in the chamber 1 with the volume difference V3 after the pre-settable time span T will reach a higher value Pg at a larger volume V3 and a lower value Pk at a smaller volume V3.
Thus, the pressure arrived at in the differential volume or in the volume which is correlated to the volume V3 to be checked, respective after the pre-settable time span T
is evaluated as evaluation signal for the volume test.
According to a second variant of the evaluations, and such as illustrated in Fig. lc a predetermined and ~19~~~-6 adjustable pressure value Per is set instead of a pre-set time span. To this end and such as illustrated at the left side in Fig. lc the output of the pressure sensor 13 is connected to a comparator 17 and a signal S which corresponds to the above-mentioned pressure Per is inputted as reference value into the comparator 17. By means of the starting signal which was explained by reference to Fig. la the time counter 19 is started and then stopped by the output signal of the comparator, i.e. at the instance when the pressure measured at the sensor 13 reaches a valuve S
which corresponds to the pre-settable pressure threshold value Per. The time value z taken at the counter 19 is then evaluated as volume indicating signal.
It is shown by the course at the right side of Fig. lc that at a larger volume V3 to be tested the time span Tg is shorter than in case of a smaller volume tested where the time span such as illustrated qualitatively increases with ~k~
Fig. ld illustrates a further variant of preparing a checking signal. By means of a sensor 21 illustrated in Fig. la by broken lines the amount of gas, the mass or volume, respective flow m fed per unit of time to the differential volume V1 - V3 is measured and integrated at the integration unit 23 over the time wherewith the amount of gas which has flown from the starting of the measuring cycle is detected.
Now, according to Fig. ld again a limit or threshold, respective PGr is pre-set and the amount of gas is measured which has flown from the start of the measuring cycle up to reaching this limit pressure. If the volume 3 to be checked is larger than the amount of gas Mg which has flown until reaching the limit pressure is smaller than in case of a smaller volume to be checked, such as illustrated by Mk.
The reaching of the limit pressure Per according to Fig. ld is achieved for instance by a pressure sensor 13 and a comparator 17 switched in following the sensor 13 and by pre-setting the limit pressure Per such as illustrated at the left in Fig. lc.
Fig. le illustrates a further variant of preparing an evaluation signal. A pre-set measuring cycle T is set and the amount of gas is measured which has flown after the start of the measuring cycle. During the pre-set time span T, at a constant delivery pressure of the source 9 and at a delivered amount m per unit of time which, therefore, depends from the delivery pressure Pg and the pressure in the differential volume, a lower amount of gas flows into the differential volume V1 - V3 at a larger volume V3 to be checked, such as illustrated schematically by Mg. And analogue thereto, at a smaller volume V3 to be checked the amount Mk of gas which is fed within the time span T is larger.
The amount of gas which has flown from the start of the measuring cycle is sensed for instance again by the sensor 21 illustrated in Fig. 1 by broken lines and the integrator 23 coupled at the output side thereof.
In Fig. 2 the apparatus which is analogue to the apparatus of Fig. la is shown, when the volume which is correlated to the volume to be checked is formed directly by the inner volume V3 of the container to be checked, such as for instance a plastic bottle. Here the possibly installed pressure sensor of Fig. la is arranged directly at the delivery line 7 between a connector 25 for a tight, sealed connecting of the line 7 to the opening of the container 3.
In contrast to the variant of the embodiment of Fig. la the container here is an open container such as a plastic bottle which just has been produced.
The procedure and the technique of evaluation remain the same, such as already explained with reference to Fig. 1.
Latter technique is such as schematically illustrated in Fig. 3 extraordinarily advantageous and suitable for a checking of containers 3a, 3b, etc. which are supplied at a continuous in-line production fashion and just have been produced, whereby the checking of the volume is either made via flexible connections during the moving of the containers, for instance on a conveyor belt 27, or then when 219334.6 _ 7 an intermittently driven conveyor belt or correspondingly driven conveyor apparatus, respective is present, where one container or such as shown in Fig. 3 preferably a plurality of containers are simultaneously subjected to the volume testing.
In order to solve at the procedures according to Figs.
2 and 3, respective sealing difficulties in case of deviations of dimensions and shapes of the opening areas 29 of the containers to be controlled which may for instance occur due to production tolerances or then in order to be able to control various containers at a production line without any adjusting procedures, respective it is suggested to design the connector 25 according to Figs. 2 and 3 such as illustrated in Fig. 4. Accordingly, a connector structured in accordance with the invention includes a casing 29, for instance of metal or plastic having a recess 31 for receipt of the opening area of the container 3 to be checked, for instance of a bottle neck of a plastic bottle.
A circumferentially extending bellows 33 is mounted at the lower area of the recess and coaxially to an axis A of the recess which bellows is made of a rubber elastic material, and conduits for a pressurized medium are located at one or a plurality of locations which open into the bellows, whereby such medium is preferably a pressurized gas.
A connector in accordance with the invention includes furthermore, a supply line 37 which opens into the recess 31 and which is connected if the inventive connector is used for volume checking purposes according to Figs. 2 and 3, to the gas feed connecting line 7.
By inflating the bellows 33 the connector 25 is placed at its lower area in a sealed manner onto the opening area or the bottle neck, respective of the respective container 3 to be checked. A tightly sealed seat is arrived at, within large limits independent from the specific bulging shape or dimension, respective of this opening area. When applying the connector 25 it is preferred, such as illustrated by F
to apply pressure onto the connector 25 which is transmitted 219334.6 _ 8 via the container 3 to be checked onto its respective supporting base such that upon an inflating and sealed placing of the bellows 33 onto the outer small surface of the container 3 to be checked no yielding in axial direction according to A of the connector 25 or container 3, respectively can occur.
According to the described procedure it is possible to make a volume checking of closed or opened containers in that the evaluation signals illustrated in the figures and described above may be, such as herein not specifically entered into but quite obvious to the person skilled in the art, be subjected in a further generally known procedure can be classified further: Depending from the fact if the evaluation signals are too high or too low or too large or too small, respectively a respective container which is checked is rejected as not acceptably large or not acceptably small.
By a controlling of the amount of gas in fed per unit of time to the respective volume, time spans which must pass within which one must wait for a pressure equalization until a relevant measuring is possible are not longer needed.
By means of the connector suggested in accordance with the invention it is possible to contact in a sealed manner containers having variously shaped or dimensioned, respective opening areas within a large range, such as bottle necks, and for instance for filling same or in connection with a checking of the volume in order to act upon the containers by means of checking gas.
While there are shown and described present preferred embodiments of the invention it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodied and practised within the scope of the following claims. Specifically to be noted is that all claimed embodiments relating to the method and apparatus for checking singly checked containers are equally applicable for an in-line checking specifically of plastic bottles.
Fig. lc is a diagram analogue to the diagram of Fig. lb for the explanation of a further variant of the preparation for the evaluation signal;
Fig. ld is a diagram to illustrate the mass of gas which has flown in correlation with the pressure in the gas chamber, for the illustrating of a further variant of the preparation for the evaluation signal;
Fig. le is a diagram illustrating in relation to the time axis the mass of gas which has flown since the beginning of the measuring cycle for the explaining of a further variant of the preparation for the evaluation signal;
Fig. 2 is an illustration analogue to Fig. la and of a variant in which the volume which is correlated to the volume to be checked is taken directly as the volume of a container to be checked;
Fig. 3 is an illustration analogue to the illustration of Fig. 2, showing schematically the checking of groups of containers arranged in line during the production of the containers;
Fig. 4 is an illustration of a longitudinal section through a connector for containers specifically used with the apparatus of Figs. 2 and 3 for the volume checking method and the volume checking apparatus, respectively.
Description of the Preferred Embodiments Fig. la illustrates schematically a checking chamber 1, whereby in this variant of the embodiments a closed container 3, possibly filled by its contents is placed into the chamber 1. The setting of the container 3 to be checked and having a volume V3 into the chamber l, due to which the differential volume V1 - V3 is produced in the chamber proceeds by a charging gate which can be closed in a 21933-b completely sealed manner and is not particularly illustrated.
A source 5 of pressurized gas is connected via a connecting line 7 to the chamber 1. In accordance with the schematic illustration, the source 5 allows basically a controlled setting of the mass flow m of the gas which is fed per unit of time via the line 7 to the volume V1 - V3, such as a setting to respective constant values. For this task and by example a storage tank 9 is provided for the pressurized gas and a control member 11 regulated by the through mass flow, such as for instance a constantly adjustable valve.
This extremely simple volume testing apparatus operates such as will be explained with reference to Figs. lb to le.
After the volume or container 3, respective to be tested the flow of a predetermined mass flow m of gas is set by means of the source 5 which is controlled regarding the mass flow in, for instance by the continuously adjustable valve 11. The pressure P1_3 in the volume difference V1 - V3 rises during the time span. This pressure is sensed by means of a pressure sensor 13.
Simultaneously with the beginning of the operation or opening, respective of the valve 11 a timing unit 15 is started which after a pre-settable time span T outputs or forwards further, respective the output of the pressure sensor 13 for the further evaluation and thus an evaluation signal indicative of the checking.
According to the illustration of Fig. lb the pressure arrived at in the chamber 1 with the volume difference V3 after the pre-settable time span T will reach a higher value Pg at a larger volume V3 and a lower value Pk at a smaller volume V3.
Thus, the pressure arrived at in the differential volume or in the volume which is correlated to the volume V3 to be checked, respective after the pre-settable time span T
is evaluated as evaluation signal for the volume test.
According to a second variant of the evaluations, and such as illustrated in Fig. lc a predetermined and ~19~~~-6 adjustable pressure value Per is set instead of a pre-set time span. To this end and such as illustrated at the left side in Fig. lc the output of the pressure sensor 13 is connected to a comparator 17 and a signal S which corresponds to the above-mentioned pressure Per is inputted as reference value into the comparator 17. By means of the starting signal which was explained by reference to Fig. la the time counter 19 is started and then stopped by the output signal of the comparator, i.e. at the instance when the pressure measured at the sensor 13 reaches a valuve S
which corresponds to the pre-settable pressure threshold value Per. The time value z taken at the counter 19 is then evaluated as volume indicating signal.
It is shown by the course at the right side of Fig. lc that at a larger volume V3 to be tested the time span Tg is shorter than in case of a smaller volume tested where the time span such as illustrated qualitatively increases with ~k~
Fig. ld illustrates a further variant of preparing a checking signal. By means of a sensor 21 illustrated in Fig. la by broken lines the amount of gas, the mass or volume, respective flow m fed per unit of time to the differential volume V1 - V3 is measured and integrated at the integration unit 23 over the time wherewith the amount of gas which has flown from the starting of the measuring cycle is detected.
Now, according to Fig. ld again a limit or threshold, respective PGr is pre-set and the amount of gas is measured which has flown from the start of the measuring cycle up to reaching this limit pressure. If the volume 3 to be checked is larger than the amount of gas Mg which has flown until reaching the limit pressure is smaller than in case of a smaller volume to be checked, such as illustrated by Mk.
The reaching of the limit pressure Per according to Fig. ld is achieved for instance by a pressure sensor 13 and a comparator 17 switched in following the sensor 13 and by pre-setting the limit pressure Per such as illustrated at the left in Fig. lc.
Fig. le illustrates a further variant of preparing an evaluation signal. A pre-set measuring cycle T is set and the amount of gas is measured which has flown after the start of the measuring cycle. During the pre-set time span T, at a constant delivery pressure of the source 9 and at a delivered amount m per unit of time which, therefore, depends from the delivery pressure Pg and the pressure in the differential volume, a lower amount of gas flows into the differential volume V1 - V3 at a larger volume V3 to be checked, such as illustrated schematically by Mg. And analogue thereto, at a smaller volume V3 to be checked the amount Mk of gas which is fed within the time span T is larger.
The amount of gas which has flown from the start of the measuring cycle is sensed for instance again by the sensor 21 illustrated in Fig. 1 by broken lines and the integrator 23 coupled at the output side thereof.
In Fig. 2 the apparatus which is analogue to the apparatus of Fig. la is shown, when the volume which is correlated to the volume to be checked is formed directly by the inner volume V3 of the container to be checked, such as for instance a plastic bottle. Here the possibly installed pressure sensor of Fig. la is arranged directly at the delivery line 7 between a connector 25 for a tight, sealed connecting of the line 7 to the opening of the container 3.
In contrast to the variant of the embodiment of Fig. la the container here is an open container such as a plastic bottle which just has been produced.
The procedure and the technique of evaluation remain the same, such as already explained with reference to Fig. 1.
Latter technique is such as schematically illustrated in Fig. 3 extraordinarily advantageous and suitable for a checking of containers 3a, 3b, etc. which are supplied at a continuous in-line production fashion and just have been produced, whereby the checking of the volume is either made via flexible connections during the moving of the containers, for instance on a conveyor belt 27, or then when 219334.6 _ 7 an intermittently driven conveyor belt or correspondingly driven conveyor apparatus, respective is present, where one container or such as shown in Fig. 3 preferably a plurality of containers are simultaneously subjected to the volume testing.
In order to solve at the procedures according to Figs.
2 and 3, respective sealing difficulties in case of deviations of dimensions and shapes of the opening areas 29 of the containers to be controlled which may for instance occur due to production tolerances or then in order to be able to control various containers at a production line without any adjusting procedures, respective it is suggested to design the connector 25 according to Figs. 2 and 3 such as illustrated in Fig. 4. Accordingly, a connector structured in accordance with the invention includes a casing 29, for instance of metal or plastic having a recess 31 for receipt of the opening area of the container 3 to be checked, for instance of a bottle neck of a plastic bottle.
A circumferentially extending bellows 33 is mounted at the lower area of the recess and coaxially to an axis A of the recess which bellows is made of a rubber elastic material, and conduits for a pressurized medium are located at one or a plurality of locations which open into the bellows, whereby such medium is preferably a pressurized gas.
A connector in accordance with the invention includes furthermore, a supply line 37 which opens into the recess 31 and which is connected if the inventive connector is used for volume checking purposes according to Figs. 2 and 3, to the gas feed connecting line 7.
By inflating the bellows 33 the connector 25 is placed at its lower area in a sealed manner onto the opening area or the bottle neck, respective of the respective container 3 to be checked. A tightly sealed seat is arrived at, within large limits independent from the specific bulging shape or dimension, respective of this opening area. When applying the connector 25 it is preferred, such as illustrated by F
to apply pressure onto the connector 25 which is transmitted 219334.6 _ 8 via the container 3 to be checked onto its respective supporting base such that upon an inflating and sealed placing of the bellows 33 onto the outer small surface of the container 3 to be checked no yielding in axial direction according to A of the connector 25 or container 3, respectively can occur.
According to the described procedure it is possible to make a volume checking of closed or opened containers in that the evaluation signals illustrated in the figures and described above may be, such as herein not specifically entered into but quite obvious to the person skilled in the art, be subjected in a further generally known procedure can be classified further: Depending from the fact if the evaluation signals are too high or too low or too large or too small, respectively a respective container which is checked is rejected as not acceptably large or not acceptably small.
By a controlling of the amount of gas in fed per unit of time to the respective volume, time spans which must pass within which one must wait for a pressure equalization until a relevant measuring is possible are not longer needed.
By means of the connector suggested in accordance with the invention it is possible to contact in a sealed manner containers having variously shaped or dimensioned, respective opening areas within a large range, such as bottle necks, and for instance for filling same or in connection with a checking of the volume in order to act upon the containers by means of checking gas.
While there are shown and described present preferred embodiments of the invention it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodied and practised within the scope of the following claims. Specifically to be noted is that all claimed embodiments relating to the method and apparatus for checking singly checked containers are equally applicable for an in-line checking specifically of plastic bottles.
Claims (12)
1. A connector for sealingly gripping a wall section of a substantially cylindrical part of a container, defining a container opening, comprising a connector casing to be applied to said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
2. A connector according to claim 1, wherein said connector casing includes at least one connection for a gas line opening thereinto.
3. A connector according to claim 1, wherein said connector casing is ring-shaped with said at least one flexible annular bellows mounted thereto so as to be applied from the exterior of said wall section of said container.
4. A connector according to claim 1, wherein said connector casing includes a recess for receipt of said wall section of a substantially cylindrical part of the container defining the container opening, and wherein said at least one flexible annular bellows arrangement extends circumferentially about said recess.
5. A connector according to claim 4, wherein said recess is shaped to receive a bottle neck of a bottle as said container.
6. An apparatus for checking containers, the apparatus comprising a source of pressurized gas, a connecting line extending from said source of pressurized gas to a container to be checked, said connecting line comprising a connector for sealingly gripping a wall section of a substantially cylindrical part of said container, defining a container opening, said connector comprising a connector casing to be applied around said wall section of the container, and at least one pneumatically operated elastically flexible annular bellows arrangement mounted to said casing about a central axis of said annular bellows arrangement, said annular bellows arrangement being pneumatically inflatable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
7. An apparatus according to claim 6, wherein said connector casing includes at least one connection for a gas line opening thereinto.
8. An apparatus according to claim 6, wherein said connector casing includes a recess for receipt of said wall section of a substantially cylindrical part of the container defining the container opening, and wherein at least one flexible annular bellows arrangement extends circumferentially about said recess.
9. An apparatus according to claim 8, wherein said recess is shaped to receive a bottle neck of a bottle as said container.
10. A connector for sealingly gripping a wall section of a container defining a container opening, comprising a connector casing to be applied around said wall section of the container, and at least one flexible sealing means mounted to said casing so as to extend about a central axis of said flexible sealing means, said flexible sealing means being extendable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
11. An apparatus for checking containers, the apparatus comprising a source of pressurized gas, a connecting line extending from said source of pressurized gas to a container to be checked, said connecting line comprising a connector for sealingly gripping a wall section of a part of said container defining a container opening, said connector comprising a connector casing to be applied around said wall section of the container, and at least one flexible sealing means mounted to said casing about a central axis of said flexible being sealing means, said flexible sealing means extendable in radial direction with respect to said axis so as to be brought into sealing contact with said wall section, independently within limits of the dimensioning and the shape of said wall section.
12. An apparatus according to claim 6, wherein said connector casing is ring-shaped with said at least one flexible annular bellows mounted thereto so as to be applied from the exterior of said wall section of said container.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4017853A DE4017853C2 (en) | 1990-06-02 | 1990-06-02 | Connection for filling a container and device for checking the volume of containers |
| DEP4017853.6 | 1990-06-02 | ||
| CA002043402A CA2043402C (en) | 1990-06-02 | 1991-05-28 | Method of and apparatus for checking the volume of containers |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002043402A Division CA2043402C (en) | 1990-06-02 | 1991-05-28 | Method of and apparatus for checking the volume of containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2193346A1 CA2193346A1 (en) | 1991-12-03 |
| CA2193346C true CA2193346C (en) | 2000-11-14 |
Family
ID=6407728
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002043402A Expired - Lifetime CA2043402C (en) | 1990-06-02 | 1991-05-28 | Method of and apparatus for checking the volume of containers |
| CA002193346A Expired - Lifetime CA2193346C (en) | 1990-06-02 | 1991-05-28 | A method of and apparatus for checking the volume of containers |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002043402A Expired - Lifetime CA2043402C (en) | 1990-06-02 | 1991-05-28 | Method of and apparatus for checking the volume of containers |
Country Status (9)
| Country | Link |
|---|---|
| US (2) | US5535624A (en) |
| EP (3) | EP1310777B1 (en) |
| JP (2) | JP2941092B2 (en) |
| AT (3) | ATE237124T1 (en) |
| CA (2) | CA2043402C (en) |
| DE (5) | DE4017853C2 (en) |
| DK (3) | DK1310777T3 (en) |
| ES (3) | ES2247430T3 (en) |
| HK (3) | HK1057607A1 (en) |
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-
1991
- 1991-05-28 AT AT97120677T patent/ATE237124T1/en not_active IP Right Cessation
- 1991-05-28 CA CA002043402A patent/CA2043402C/en not_active Expired - Lifetime
- 1991-05-28 EP EP03000938A patent/EP1310777B1/en not_active Expired - Lifetime
- 1991-05-28 CA CA002193346A patent/CA2193346C/en not_active Expired - Lifetime
- 1991-05-28 AT AT91108726T patent/ATE167289T1/en not_active IP Right Cessation
- 1991-05-28 ES ES03000938T patent/ES2247430T3/en not_active Expired - Lifetime
- 1991-05-28 ES ES91108726T patent/ES2118068T3/en not_active Expired - Lifetime
- 1991-05-28 AT AT03000938T patent/ATE301278T1/en not_active IP Right Cessation
- 1991-05-28 EP EP97120677A patent/EP0833133B1/en not_active Expired - Lifetime
- 1991-05-28 ES ES97120677T patent/ES2196242T3/en not_active Expired - Lifetime
- 1991-05-28 DE DE59109268T patent/DE59109268D1/en not_active Expired - Lifetime
- 1991-05-28 DE DE59109006T patent/DE59109006D1/en not_active Expired - Lifetime
- 1991-05-28 DK DK03000938T patent/DK1310777T3/en active
- 1991-05-28 DK DK91108726T patent/DK0460511T3/en active
- 1991-05-28 EP EP91108726A patent/EP0460511B1/en not_active Expired - Lifetime
- 1991-05-28 DE DE59109250T patent/DE59109250D1/en not_active Expired - Lifetime
- 1991-05-28 DK DK97120677T patent/DK0833133T3/en active
- 1991-06-03 JP JP3160093A patent/JP2941092B2/en not_active Expired - Fee Related
-
1994
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-
1996
- 1996-02-22 US US08/605,646 patent/US5760294A/en not_active Expired - Lifetime
-
1997
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-
1998
- 1998-12-03 HK HK03108287A patent/HK1057607A1/en not_active IP Right Cessation
- 1998-12-03 HK HK00100279A patent/HK1021409A1/en not_active IP Right Cessation
- 1998-12-03 HK HK98112782A patent/HK1011724A1/en not_active IP Right Cessation
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