Load cell and weighing system for cryogenic tanks

• US 20040016576A1
• Filed: 07/29/2002
• Published: 01/29/2004
• Est. Priority Date: 07/29/2002
• Status: Active Grant

• Current Assignee: Chart Incorporated (Chart Industries Incorporated)
• Original Assignee: Chart Incorporated (Chart Industries Incorporated)
• Inventors: Kuechenmeister, Robert, Voss, Greg
• Granted Patent: US 6,787,713 B2
• Time in Patent Office: Days
• US Class Current: 177/142
• CPC Class Codes: G01G 17/04 for weighing fluids, e.g. gases, pastes
• CPC Class Codes: G01G 21/23 Support or suspension of weighing platforms G01G21/24 takes precedence
• CPC Class Codes: G01G 21/28 Frames, Housings
• CPC Class Codes: Y10S 177/09 Scale bearings

Abstract

A load cell and system for detecting the quantity of liquid carbon dioxide in a tank includes load cells positioned between the legs of the tank and a surface. Each load cell includes a frame constructed from a folded metal plate so that a top panel, sides and ends are formed. A beam having proximal and distal ends is suspended from the top panel of the frame by its proximal end and a spacer. A platform support is positioned upon the distal end of the beam with a platform on top. The platform support passes through an opening formed in the top panel of the frame so that the platform is supported above the frame top panel. A leg of the tank is secured to the platform. A strain gauge circuit is mounted to the top surface of the beam and a summary board receives the signals from the strain gauge circuits of multiple load cells so that the quantity of liquid in the tank is determined. This quantity may be displayed and/or transmitted as telemetry to a centralized delivery truck dispatching facility.

Claims

1. A load cell for determining the weight of an object comprising:

a) a frame having a top panel, said frame adapted to be positioned upon a surface with the top panel spaced from the surface;

b) a beam having a proximal end portion and a distal end portion, said beam suspended from the top panel of said frame by the proximal end portion;

c) a strain gauge circuit attached to said beam between the proximal and distal end portions; and

d) the distal end portion of said beam adapted to support the object.

2. The load cell of claim 1 wherein said frame includes sides and ends that are adapted to support the top panel above the surface.

3. The load cell of claim 2 where said frame is constructed from a folded metal plate.

4. The load cell of claim 1 further comprising a spacer positioned between the proximal end of the beam and the top panel of the frame.

5. The load cell of claim 1 further comprising a platform attached to the distal end of the beam.

6. The load cell of claim 5 further comprising a platform support positioned between the platform and the distal end of the beam.

7. The load cell of claim 6 wherein the top panel of said frame includes an opening formed therein through which the platform support passes so that the platform is supported above the top panel of the frame.

8. The load cell of claim 1 further comprising a floor-mount hole formed through the top panel of the frame, the floor-mount hole adapted to receive a bolt which may be positioned there through and in engagement with the surface upon which the load cell is positioned.

9. The load cell of claim 1 wherein said beam includes a top surface and the strain gauge circuit is attached to the top surface of the beam.

10. A system for weighing an object having a plurality of legs comprising:

a) a plurality of load cells, each including;

i) a frame having a top panel, said frame adapted to be positioned upon a surface with the top panel spaced from the surface;

ii) a beam having a distal end portion and a proximal end portion, said beam suspended from the top panel of said frame by the proximal end portion;

iii) said distal end of said beam adapted support one of said plurality of legs of the object;

iv) a strain gauge circuit attached to said beam between said proximal and distal end portions;

b) one each of said plurality of load cells positioned between one each of the plurality of legs and the surface;

c) the strain gauge circuits of each of said plurality of load cells in communication with an electrical device;

whereby the electrical device may determine the weight of the object via signals received from the plurality of load cells.

11. The system of claim 10 wherein the object is a tank containing a liquid and the electrical device may determine a quantity of liquid within the tank based upon the weight of the tank.

12. The system of claim 11 wherein the liquid is liquid carbon dioxide.

13. The system of claim 11 further comprising a transmitter in communication with the electrical device and an antenna in communication with the transmitter so that the quantity of liquid in the tank may be transmitted to a centralized facility.

14. The system of claim 10 wherein the electrical device includes summing and calibration circuitry.

15. The system of claim 10 wherein said electrical device includes a display device.

16. The system of claim 10 wherein the frames of the load cells are adapted to be secured to the surface and the distal ends of the load cell beams are adapted to be secured to the legs of the object.

17. The system of claim 16 wherein bolts are used to secure the load cell frames to the surface and the legs of the object to the distal ends of the load cell beams.

18. A tank system comprising:

a) a tank containing a quantity of liquid, said tank supported by a plurality of legs;

b) a load cell position under each leg, each load cell including;

i) a frame having a top panel, said frame adapted to be positioned on a surface with the top panel spaced from the surface;

ii) a beam having a distal end portion and a proximal end portion, said beam suspended from the top panel of said frame by the proximal end portion;

iii) said distal end of said beam adapted support one of said plurality of legs of the object;

iv) a strain gauge circuit attached to said beam between said proximal and distal end portions;

c) the strain gauge circuits of each of said plurality of load cells in communication with an electrical device;

whereby the electrical device may determine the quantity of liquid within the tank via signals received from the plurality of load cells.

19. The tank of claim 18 wherein the liquid is liquid carbon dioxide.

20. The system of claim 19 further comprising a transmitter in communication with the electrical device and an antenna in communication with the transmitter so that the quantity of liquid carbon dioxide in the tank may be transmitted to a centralized facility.