High precision weighing system and weighing method, thermogravimetric analyser and storage medium

Patent metadata

Field	Value
Publication number	US-11959934-B2
Application number	US-201916982695-A
Country	US
Kind code	B2
Filing date	Jan 28, 2019
Priority date	Feb 27, 2018
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A high precision weighing system and weighing method has a weighing plate and weighing unit separation mechanism and a weight loading mechanism. The weighing plate and weighing unit separation mechanism controls separation of a weighing plate and a weighing unit, so that the weighing plate or the weighing plate and its carried material do not apply force to the weighing unit. The weight loading mechanism loads a weight onto the weighing unit or removes a weight from the weighing unit; the weighing system records a weighing value of the weighing unit during the action of the weighing plate and weighing unit separation mechanism and a sensitivity value during the action of the weight loading mechanism. The weighing system modifies the weighing value at the time of the most recent combination of the weighing plate and the weighing unit based on the recorded weighing and sensitivity values, achieving a high precision.

First claim

What is claimed is:

1. A weighing system, comprising:
a weighing plate,
a weighing unit,
a separation mechanism, configured to control a separation of the weighing plate and the weighing unit, so that no force is applied to the weighing unit by the weighing plate, or the combination of the weighing plate and an object to be weighed carried by the weighing plate; and
a weight loading mechanism, configured to load a weight onto the weighing unit or to remove a weight therefrom;
wherein the weighing system is configured to record a weighing value of the weighing unit during the action of the separation mechanism and a sensitivity value during the action of the weight loading mechanism; and
wherein the weighing system is configured to modify the weighing value at the time of the most recent combination of the weighing plate and the weighing unit based on the recorded weighing value and sensitivity value.

2. The weighing system of claim 1 , further comprising:
a weight transfer unit, as a part of the separation mechanism, which lies between the weighing plate and the weighing unit, to transfer the weight of the material carried by the weighing plate to the weighing unit; or
a weight transfer unit, controlled by the separation mechanism, which lies between the weighing plate and the weighing unit;
so that no force is applied to the weighing unit by the weighing plate, or the combination of the weighing plate and an object to be weighed carried by the weighing plate.

3. The weighing system of claim 1 , wherein the weighing system is configured to record, at a pre-set period, the weighing value of the weighing unit during the action of the separation mechanism and the sensitivity value during the action of the weight loading mechanism.

4. The weighing system of claim 1 , wherein the weighing system records weighing values of the weighing unit during the action of the separation mechanism, at the time of separation of the weighing plate and the weighing unit and at the time of combination of the weighing plate and the weighing unit.

5. The weighing system of claim 1 , further comprising:
at least one environment perception sensor, the sensor being mounted on or nearby the weighing plate for detecting and acquiring an environment parameter, and
at least one weighing environment auxiliary module for reducing the influence of an environment change on the weighing system.

6. The weighing system of claim 5 , further comprising: a processor that records the weighing value of the weighing unit during the action of the separation mechanism and the sensitivity value during the action of the weight loading mechanism, and calculates, modifies and outputs the weighing value at the time of the most recent combination of the weighing plate and the weighing unit, wherein the controller further modifies the weighing value at the time of the most recent combination of the weighing plate and the weighing unit based on the environment parameter.

7. The weighing system of claim 1 , further comprising: a processor that records the weighing value of the weighing unit during the action of the separation mechanism and the sensitivity value during the action of the weight loading mechanism, and calculates, modifies and outputs the weighing value at the time of the most recent combination of the weighing plate and the weighing unit.

8. A thermo-gravimetric analyser, comprising:
the weighing system of claim 1 , wherein the separation mechanism controls the separation of a thermo-gravimetric weighing plate and a weighing unit, and
a sensor for detecting an environment parameter being provided on or nearby the thermo-gravimetric weighing plate, or the thermo-gravimetric weighing plate and the sensor are integrally formed.

9. A weighing method for a weighing system comprising a weighing plate, a weighing unit, a separation mechanism, and a weight loading mechanism; wherein the method comprises the steps of:
performing, sequentially, weighing plate and weighing unit separation actions by the separation mechanism, and weight loading actions by the weight loading mechanism,
recording a weighing value during each weighing plate and weighing unit separation action, and recording a sensitivity value during each weight loading action; and
modifying the weighing value at the time of the most recent combination of the weighing plate and the weighing unit based on the recorded weighing value and sensitivity value.

10. The weighing method of claim 9 , wherein the steps of performing and recording are conducted at a predetermined test interval.

11. The weighing method of claim 10 , wherein the step of modifying the weighing value uses the formula:

Wtrue
=

Wi
×

Si

S
⁢
0

where Wtrue is a modified weighing value, Wi is a weighing value at the time of the most recent combination of the weighing plate and the weighing unit, Si is the most recently recorded sensitivity value, and S0 is a firstly recorded sensitivity value.

12. The weighing method of claim 11 , wherein the weighing values WI of the weighing unit recorded during the action of the separation mechanism, at the time of separation of the weighing plate and the weighing unit and at the time of combination of the weighing plate and the weighing unit are calculated at the time of combination of the weighing plate and the weighing unit using the formula:
Wi=Wfi—Wzi
where Wfi is a weighing value at the time of combination of the weighing plate and the weighing unit, and Wzi is a weighing value at the time of separation of the weighing plate and the weighing unit.

13. The weighing method of claim 11 , further comprising the step of:
acquiring an environment parameter on or nearby the weighing plate, and using the environment parameter to modify the modified weighing value Wtruei.

14. The weighing method of claim 9 , further comprising the steps of:
calculating a weighing data change Wchange, after recording a weighing value during each weighing plate and weighing unit separation action and recording a sensitivity during each weight loading action, using the formula:
W change= W 1 −W 0

where Wi is a weighing value at the time of combination of the weighing plate and the weighing unit, and W0 is a weighing value at the time of the first combination of the weighing plate and the weighing unit; and
exiting the weighing procedure when Wchange exceeds a predetermined change threshold.

15. A storage medium, comprising: a stored program,
wherein the program, when running, is configured to control an apparatus in which the storage medium is located to execute the weighing method of claim 9 .

Assignees

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

Inventors

• Xu Lei
• Emery Jean-Christophe

Classifications

• G01N5/045 Primary

  for determining moisture content · CPC title

• G01G23/012 Primary

  with load cells comprising in-build calibration weights · CPC title