Calibration device for weighing system

Patent metadata

Field	Value
Publication number	US-11965772-B2
Application number	US-201917265560-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Sep 18, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A calibration device is provided for a weighing system that has a tank with a plurality of support legs at a lower part thereof. The calibration device has at least one calibration module, a hydraulic system and a calibration terminal. An upper end of each calibration module is connected to an upper part of a corresponding support leg. A lower end of each calibration module is fixed to a foundation. A hose connects each calibration module to the hydraulic system for applying a force to the tank. The calibration terminal, connected to each calibration module, displays in real-time, the force applied to the tank. The calibration device can greatly improve the production efficiency, and in use, takes only two hours to complete the calibration, which is faster than the test weight and other calibration methods.

First claim

What is claimed is:

1. A device for calibrating a weighing system, the weighing system comprising a tank having, at a lower portion, a plurality of support legs, the calibration device comprising:
at least one calibration module, such that each calibration module is adapted at an upper end for fixed connection to an upper part of a corresponding one of the support legs and a lower end is adapted for fixed connection to a foundation;
a hydraulic system connected by a hose to each calibration module for applying a force to the tank;
a calibration terminal, connected to each of the at least one calibration modules for real time display of the force applied to the tank;
a calibration load cell in each calibration module for converting the applied force from the calibration module into an analog signal; and
at least one analog-to-digital (“A/D”) converter for converting the analog signal into a digital output signal;
wherein, for each calibration load cell, a corresponding:
one of the A/D converters is located at the calibration terminal for converting the analog signal and providing a digital output signal for processing at the calibration terminal;
one of the A/D converters is located at the calibration load cell for converting the analog signal and providing a digital output signal for processing at the calibration terminal; or
smart junction box is provided, having an A/D converter for each calibration load cell, for converting the analog signal received therefrom and providing a digital output signal per calibration load cell for processing at the calibration terminal.

2. The device of claim 1 , wherein:
the hydraulic system comprises:
a pump;
a pressure gauge;
a manifold, having a first side and a second side, the first side being connected by way of the pressure gauge to the pump;
a plurality of hoses,
a plurality of one-way stop valves; and
a plurality of hydraulic cylinders, each of the hydraulic cylinders connected to the second side of the manifold by way of a corresponding one of the hoses, with one of the one-way stop valves positioned between the hydraulic cylinder and the corresponding one of the hoses.

3. The device of claim 2 , wherein each of the hoses is a high-pressure flexible hose.

4. The device of claim 2 , wherein each of the hydraulic cylinders is a pull-type hydraulic cylinder.

5. The device of claim 2 , wherein the pump is a manual pump or an electric pump.

6. The device of claim 1 , further comprising:
as a part of each calibration module, a plurality of U-clevises, a plurality of rod ends, a coupling nut, a threaded rod, a calibration load cell and a pull-type hydraulic cylinder, such that a lower end of the calibration load cell is connected, in succession, to the rod ends of the pull-type hydraulic cylinder, the U-clevis and the rod end, and an upper end of the calibration load cell is connected, in succession, to the threaded rod, the coupling nut, the rod end and the U-clevis.

7. The device of claim 6 , further comprising:
a plurality of lifting lugs are arranged at the top of the support legs, and the U-clevises are fixedly connected to the corresponding lifting lugs.

8. The device of claim 7 , further comprising:
a plurality of anchor plates wherein the bottom ends of the support legs or support brackets are supported by a solid foundation, a mezzanine floor or steel structure via anchor plates, and the rod ends are fixed to the anchor plates.

9. The device of claim 1 , wherein up to four calibration modules are provided.

10. The device of claim 1 , wherein a pull-type calibration load cell is connected in series with a pull-type hydraulic cylinder, and is used to display, in real time, a tension load value generated by the pull-type hydraulic cylinder, via the calibration terminal.

11. A calibration device for a weighing system having a tank, with a plurality of support legs or support brackets for the tank on a solid foundation, a mezzanine floor or a steel structure, the calibration device comprises:
at least one calibration module for applying a force to the tank fixedly connected at an upper end of the calibration module to one of each support leg or support bracket, and fixedly connected at a lower end of the calibration module to the solid foundation, mezzanine floor or steel structure, each calibration module comprising a calibration load cell for converting a force applied from the calibration module into an analog signal;
a calibration terminal for processing the analog signal and displaying, in real time, the applied force from the calibration module; and
at least one analog-to-digital (“A/D”) converter for converting the analog signal into a digital signal, wherein one of the following applies:
for each calibration load cell, a corresponding one of the A/D-converters is located at the calibration terminal for converting the analog signal and providing a digital output signal for processing at the calibration terminal, or
for each calibration load cell, a corresponding one of the A/D-converters is located at the calibration load cell for converting the analog signal and providing a digital output signal for processing at the calibration terminal, or
a smart junction box is provided, having an A/D-converter for each calibration load cell for converting the analog signal received therefrom and providing a digital output signal per calibration load cell for processing at the calibration terminal.

Assignees

• Mettler Toledo Prec Instrument Company Limited
• Mettler Toledo Measurement Tech Company Limited
• Mettler Toledo Int Trading Shanghai Co Ltd

Inventors

• Zhang Haitao
• Li Chunhui
• Zhang Ping
• Ding Chenggang
• Leahy Tom

Classifications

• G01G23/01 Primary

  Testing or calibrating of weighing apparatus · CPC title

• G01G23/18

  Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated · CPC title

• G01G17/04

  for weighing fluids, e.g. gases, pastes · CPC title