Sealed container pressure gauging apparatus and method
阅读：940发布：2023-01-10
专利汇可以提供Sealed container pressure gauging apparatus and method专利检索，专利查询，专利分析的服务。并且An apparatus for use on line with evacuated container processing equipment for determining container internal pressure levels. The containers have at least one flexible wall portion capable of varying the charge status on a pair of capacitor plates in proximity with the wall portion by variation of the distance between the wall portion and the capacitor plates. The variation in charge on the capacitor plates is used to indicate the initial motion of the flexible wall portion caused by a change in the differential pressure across the wall portion. The apparatus includes a low pressure chamber, a valving system for controlling pressure adjacent to the flexible wall portion, means for automatically positioning the container and sampling the pressure adjacent to the wall portion at the time of initial motion, and means for rejecting the container from the line if the sampled pressure signal indicates container internal pressure level is inadequate.，下面是Sealed container pressure gauging apparatus and method专利的具体信息内容。
1. In a pressure gauging system for determining the internal pressure in a sealed container having a flexible wall, means cooperating with said flexible wall forming a chamber therewith, means for introducing a pressure to said chamber to cause said flexible wall to move as the pressure in said chamber equalizes with the internal pressure, and means responsive to initial velocity of said flexible wall as it flexes said last named means spaced from said flexible wall and providing a first electrical signal indicative of initial wall velocity, a pressure transducer responsive to the pressure in said chamber and providing a second electrical signal indicative thereof, and means for sampling said second electrical signal actuated by said first electrical signal, whereby the internal pressure determination is independent of the distance through which said flexible wall moves.
2. A pressure gauging system as in claim 1 wherein said means cooperating with said flexible wall forming a chamber comprises a member for isolating said flexible wall portion from ambient pressure adapted to conform to the external surface of said container surrounding said flexible wall portion, and means for forcing the cOntainer into sealed contact with the conforming surface of said member, together with means for providing a third electrical signal for indicating when sealed contact is not obtained.
3. In a pressure gauging system for determining the internal pressure in a sealed container having a flexible wall, means cooperating with said flexible wall forming a chamber therewith, means for introducing a pressure to said chamber to cause said flexible wall to move as the pressure in said chamber equalizes with the internal pressure, and means responsive to initial velocity of said flexible wall as it flexes to indicate the pressure in said chamber, wherein said means for introducing a pressure in said chamber comprises a test sequence circuit providing a time delayed output, means for causing said container to dwell proximate to said means cooperating with said flexible wall for a predetermined length of time and for forming said chamber prior to the beginning of said time delayed output, means connected to said test sequence circuit for synchronizing the test with container dwell time at said test station and for generating a zero time reference, and valve means for communicating said pressure with said chamber actuated by said time delayed output.
4. In a pressure gauging system for determining the internal pressure in a sealed container having a flexible wall, means cooperating with said flexible wall forming a chamber therewith, means for introducing a pressure to said chamber to cause said flexible wall to move as the pressure in said chamber equalizes with the internal pressure, and means responsive to initial velocity of said flexible wall as it flexes to indicate the pressure in said chamber wherein said means responsive to initial velocity of said flexible wall comprises a velocity sensor providing an output signal when said flexible wall begins to move, a velocity sensor circuit for receiving said velocity sensor output and for generating a sampling signal and a chamber venting signal responsive to a predetermined velocity sensor output level, pressure sensing means receiving said sampling signal for monitoring said chamber pressure and producing an output related to chamber pressure at the time the sampling signal occurs, and valve means actuated by said chamber venting signal for communicating said chamber with ambient pressure.
5. A pressure gauging system as in claim 4 together with means for receiving said output related to chamber pressure, means for providing a reference signal related to a limit for internal pressure, means for comparing said output related to chamber pressure and said reference signal, a rejection signal output from said means for comparing when said chamber pressure is beyond said limit and means responsive to said rejection signal for rejecting containers with indicated internal pressure beyond said limit.
6. A pressure gauging system as in claim 5 together with circuit means for producing a first signal indicative of a test taking place, circuit means providing a second signal responsive to said velocity sensor output, and circuit means combining said first and second signals, said circuit means combining operating to provide said rejection signal output when a test is performed and no velocity sensor output occurs.
7. A vacuum gauging system for use in determining vacuum level inside sealed metal containers having a flexible wall portion, comprising a test plate adapted to communicate with the flexible wall portion to define a test volume therebetween, means in communication with said test volume for providing a signal indicative of initial velocity of flexing of the flexible wall portion, an evacuated chamber, a valve system in communication with said evacuated chamber and with ambient pressure for providing varying pressure levels to said test volume, a test sequence circuit for communicating said varying pressure levels with saids means for providing said signal indicative of initial velocity and for providing a container Positioning signal, means for positioning the container proximate to said test plate responsive to said container positioning signal, a pressure transducer for sensing said varying pressure levels and providing a signal responsive thereto, means for providing a predetermined reference signal representing a maximum container internal pressure level, means for providing a sampling signal responsive to said signal indicative of initial velocity, and means for receiving said sampling signal and generating an additional signal related to said signal responsive to varying pressure levels and comparing said additional signal with said reference signal.
8. A vacuum gauging system as in claim 7 wherein said means for providing a signal indicative of initial velocity of flexing comprises first and second capacitor plates together with means for charging said first and second capacitor plates to predetermined positive and negative charge levels respectively, whereby said charge on said first and second capacitor plates begins to change when the flexible wall portion begins to move, and means for amplifying said change in charge thereby providing said signal indicative of initial velocity of flexing.
9. A vacuum gauging system as in claim 7 wherein said valve system includes first and second electrically actuated valves, said first valve for venting said test plate to said evacuated chamber, said second valve for alternately isolating said test plate from ambient pressure and venting said test plate thereto.
10. A vacuum gauging system as in claim 7 wherein said test sequence circuit includes first and second time delay means, said first time delay allowing for time to position said container adjacent to said test plate prior to actuating said valve system, said second time delay providing time for passage of mechanically and electrically generated electrical transients prior to sensing output from said means providing a signal indicative of initial velocity of flexing.
11. A vacuum gauging system as in claim 7 wherein said means for comparing said additional signal and said reference signal produces a rejection signal when container internal pressure exceeds the maximum, together with means for rejecting the container responsive to said rejection signal.
12. In a vacuum gauging system for determining internal pressure levels in sealed containers having at least one flexible metal wall section, and an evacuated chamber, a valve system in communication with said evacuated chamber and ambient pressure, enclosure means in communication with said valve system for providing sealed contact with the containers and forming a chamber between said enclosure means and the flexible wall section, a velocity sensor in communication with said chamber for detecting motion of the flexible metal wall section, a pressure transducer for sensing pressure in said chamber and providing output responsive thereto, circuit means for receiving output from said velocity sensor and for providing an automatic test sequence, means for rejecting containers from a lot of containers, and a rejection circuit for receiving said pressure transducer output signal and comparing it to a reference signal for determining relative container internal pressure and for generating a rejection signal when said internal pressure is relatively high, said means for rejecting containers responsive to said rejection signal.
13. In a vacuum gauging system for use with sealed food containers having at least one flexible wall section, a track for guiding the containers, a lead screw for advancing the containers along said track, a motor for driving said lead screw, an evacuated chamber mounted adjacent to said track, means mounted adjacent to said track for providing sealed contact with the containers surrounding the flexible wall section and forming a space therebetween, means for communicating said space alternately with said evacuated chamber and ambient pressure, a velocity sensor in communication with said space for detecting initial velocity of the flexible wall section and for producing an output related thereto, a pressure transducer for sensing pressure in said space and providing output responsive thereto, a velocity sensing circuit for receiving said output related to initial velocity and providing an output at the time of said initial velocity and circuit means responsive to said velocity sensing circuit output for sampling said pressure transducer output and for actuating said means for communicating said space with ambient pressure.
14. A vacuum gauging system as in claim 13 together with container reject means for removing containers from said track, and a rejection circuit for receiving said sampled pressure transducer output, said rejection circuit operating to generate an output which actuates said reject means when said sampled pressure transducer output indicates internal container pressure above a predetermined maximum.
15. A vacuum gauging system as in claim 14 together with circuit means for providing a signal indicative of a test cycle and means for combining said output related to initial velocity of the flexible wall section and said signal indicative of a test cycle, said means for combining operating to produce an output which actuates said reject means when a test indication signal is present and no velocity sensor output is produced.
16. The method of gauging the internal pressure in a sealed container having one flexible section comprising the steps of delivering a container to a test station, delaying the container at the test station for the test period, surrounding the flexible wall section with a sealed chamber, controlling the pressure in the chamber, sensing initial motion of the flexible wall section as the pressure across the section equalizes, so that the method is independent of the distance through which the flexible wall section moves, sensing when a faulty test is performed, sampling the chamber pressure at the time of the initial motion, comparing the sampled pressure with a predetermined limit reference pressure, rejecting containers displaying internal pressures beyond the limit or which have been subjected to a faulty test, and accepting containers displaying internal pressures within the limit.
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