RECONFIGURABLE LEAK TESTING SYSTEM

• US 20130031962A1
• Filed: 09/12/2012
• Published: 02/07/2013
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Nandwani, Sunil, Holmes, Brian, Blake, Christine Anne
• Granted Patent: US 8,991,236 B2
• Time in Patent Office: Days
• US Class Current: 73/49.3
• CPC Class Codes: G01M 3/02 by using fluid or vacuum
• CPC Class Codes: G01M 3/04 by detecting the presence of fluid at the leakage point
• CPC Class Codes: G01M 3/26 by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
• CPC Class Codes: G01M 3/329 for verifying the internal pressure of closed containers

Abstract

A reconfigurable leak testing system is provided that includes a leak testing station and at least one off-shuttle cart removably attachable to the leak testing station. A fixture cartridge is translatable between the off-shuttle cart and the leak testing station. The fixture cartridge is configured to selectively couple with the leak testing station. The fixture cartridge includes an upper fixture, a lower fixture, and an actuatable testing feature. The fixture cartridge is configured to receive a part between the upper fixture and lower fixture. The actuatable testing feature is configured to contact the part. A closed volume is defined at least partially by the actuatable testing feature and the part.

Claims

1. A reconfigurable leak testing system comprising:

a leak testing station;

an off-shuttle cart removably attachable to the leak testing station; and

a fixture cartridge translatable between the off-shuttle cart and the leak testing station, the fixture cartridge configured to selectively couple with the leak testing station, the fixture cartridge including an upper fixture, a lower fixture, and an actuatable testing feature,

wherein the fixture cartridge is configured to receive a part between the upper fixture and lower fixture, the actuatable testing feature being configured to contact the part, and

wherein a closed volume is defined at least partially by the actuatable testing feature and the part.

2. The reconfigurable leak testing system of claim 1, further comprising an automated conveyor system configured to translate the fixture cartridge between the off-shuttle cart and the leak testing station.

3. The reconfigurable leak testing system of claim 2, wherein the automated conveyor system includes a station track attached to the leak testing station and a cart track attached to the off-shuttle cart, wherein the station track and the cart track are configured to cooperate to translate the fixture cartridge between the off-shuttle cart and the leak testing station.

4. The reconfigurable leak testing system of claim 3, wherein the leak testing station has a station docking feature and the off-shuttle cart has a cart docking feature, the cart docking feature being configured to mate with the station docking feature to removably attach the off-shuttle cart to the leak testing station.

5. The reconfigurable leak testing system of claim 4, further comprising a vertical position adjuster configured to adjust the cart track in a vertical direction to align the cart track with the station track.

6. The reconfigurable leak testing system of claim 5, further comprising a plurality of wheels attached to the off-shuttle cart.

7. The reconfigurable leak testing system of claim 6, further comprising a brake attached to the off-shuttle cart, the brake being configured to engage a ground surface to brake the off-shuttle cart.

8. The reconfigurable leak testing system of claim 7, wherein the off-shuttle cart is a first off-shuttle cart, the reconfigurable leak testing system further comprising a second off-shuttle cart, the second off-shuttle cart being removably attachable to the leak testing station.

9. The reconfigurable leak testing system of claim 8, further comprising a third off-shuttle cart, the third off-shuttle cart being removably attachable to the leak testing station.

10. The reconfigurable leak testing system of claim 9, wherein the station docking feature is a first station docking feature extending from a first side of the leak testing station, the reconfigurable leak testing system further comprising a second station docking feature extending from a second side of the leak testing station and a third station docking feature extending from a third side of the leak testing station, the second off-shuttle cart having a cart docking feature and the third off-shuttle cart having a cart docking feature, and wherein the cart docking features of the first, second, and third off-shuttle carts are each configured to mate with each of the first, second, and third station docking features to removably attach the first, second, and third off-shuttle carts respectively to one of the first, second, and third sides of the leak testing station.

11. The reconfigurable leak testing system of claim 8, wherein the leak testing station includes an actuator and a fixture interface coupled with the actuator, the fixture interface including a plurality of interlocks configured to selectively couple with the upper fixture of the fixture cartridge, the actuator being configured to selectively raise and lower the fixture interface.

12. The reconfigurable leak testing system of claim 11, wherein the fixture interface includes a connection panel configured to couple with the upper fixture, the connection panel including an electrical connector and a fluid connector, wherein the electrical connector provides an electrical connection between the leak testing station and the fixture cartridge, and wherein the fluid connector provides a pneumatic or hydraulic fluid connection between the leak testing station and the fixture cartridge.

13. The reconfigurable leak testing system of claim 12, further comprising a controller configured to control the actuation of the actuatable testing feature.

14. The reconfigurable leak testing system of claim 13, wherein the controller is further configured to pressurize the closed volume by providing a pressurized fluid to the volume.

15. The reconfigurable leak testing system of claim 14, wherein the controller is configured to detect a leak in the volume by monitoring the pressure of the closed volume when the closed volume is pressurized and detecting any pressure deviations from an expected pressure.

16. The reconfigurable leak testing system of claim 15, wherein the controller is configured to detect a leak in the closed volume by monitoring the total mass-flow of the pressurized fluid provided to the closed volume, and by comparing the monitored mass-flow to an expected total mass-flow.

17. The leak testing system of claim 16, wherein the actuatable testing feature includes at least one of an extendible seal and an extendible clamp.

18. A reconfigurable leak testing system comprising:

a leak testing station having a first side and a second side, the leak testing station having a first station docking feature disposed adjacent to the first side and a second station docking feature disposed adjacent to the second side;

a first off-shuttle cart removably attachable to the first and second sides of the leak testing station, the first off-shuttle cart having a first cart docking feature configured to mate with the first and second station docking features such that mating the first cart docking feature with one of the first and second station docking features removably attaches the first off-shuttle cart to the leak testing station, the first off-shuttle cart having a plurality of first wheels attached to the first off-shuttle cart;

a second off-shuttle cart removably attachable to the first and second sides of the leak testing station, the second off-shuttle cart having a second cart docking feature configured to mate with the first and second station docking features such that mating the second cart docking feature with one of the first and second station docking features removably attaches the first off-shuttle cart to the leak testing station, the second off-shuttle cart having a plurality of second wheels attached to the second off-shuttle cart;

a first fixture cartridge translatable between the first off-shuttle cart and the leak testing station, the first fixture cartridge configured to selectively couple with the leak testing station, the first fixture cartridge including a first upper fixture, a first lower fixture, and a plurality of first actuatable testing features, wherein the first fixture cartridge is configured to receive a first part between the first upper fixture and the first lower fixture, the plurality of first actuatable testing features being configured to contact the first part, and wherein a first closed volume is defined at least partially by the plurality of first actuatable testing features and the first part;

a second fixture cartridge translatable between the second off-shuttle cart and the leak testing station, the second fixture cartridge configured to selectively couple with the leak testing station, the second fixture cartridge including a second upper fixture, a second lower fixture, and a plurality of second actuatable testing features, wherein the second fixture cartridge is configured to receive a second part between the second upper fixture and the second lower fixture, the plurality of second actuatable testing features being configured to contact the second part, and wherein a second closed volume is defined at least partially by the plurality of second actuatable testing features and the second part; and

an automated conveyor system configured to translate the first and second fixture cartridges between the first and second off-shuttle carts respectively and the leak testing station, the automated conveyor system including a station track attached to the leak testing station and first and second cart tracks attached to the first and second off-shuttle carts respectively, the station track and the first cart track being configured to cooperate to translate the first fixture cartridge between the first off-shuttle cart and the leak testing station, the station track and the second cart track being configured to cooperate to translate the second fixture cartridge between the second off-shuttle cart and the leak testing station.

19. The reconfigurable leak testing system of claim 18, wherein the leak testing station includes an actuator and a fixture interface coupled with the actuator, the fixture interface including a plurality of interlocks configured to selectively couple with the first and second upper fixtures of the first and second fixture cartridges, the actuator being configured to selectively raise and lower the fixture interface, the fixture interface including a connection panel configured to couple with the first and second upper fixtures, the connection panel including an electrical connector and a fluid connector, wherein the electrical connector provides an electrical connection between the leak testing station and the first and second fixture cartridges, and wherein the fluid connector provides a pneumatic or hydraulic fluid connection between the leak testing station and the first and second fixture cartridges, the reconfigurable leak testing system further comprising a controller configured to control the actuation of the plurality of first and second actuatable testing features, the controller being configured to pressurize the first and second closed volumes by providing a pressurized fluid to the first and second closed volumes, the controller being configured to detect a leak in the first closed volume, and the controller being configured to detect a leak in the second closed volume.

20. A method of leak testing a part using a reconfigurable leak testing system, the method comprising:

wheeling an off-shuttle cart to a location adjacent to a leak testing station;

removably attaching the off-shuttle cart to the leak testing station;

automatically translating a fixture cartridge into the leak testing station, the fixture cartridge being provided with upper and lower fixtures;

receiving a part between the upper and lower fixtures;

establishing a closed volume within the part;

pressurizing the closed volume using a pressurized fluid; and

monitoring the pressurized fluid to detect fluid leakage.