Method for calibrating dispensing system and dispensing system calibration apparatus and calculator thereof

Abstract

A method for calibrating a dispensing system, applicable to calibrating the dispensing volume control of a dispensing valve for an adhesive material, includes the following steps: First, a dispensing valve control model () is established, wherein the model is constructed using a calibration solution and a plurality of first dispensing valve control signals to obtain the relationship between these first dispensing valve control signals and the plurality of dispensing pressures they generate. Next, a power law exponent () is obtained, wherein the power law exponent () is obtained using the adhesive material in a fresh state and a plurality of second dispensing valve control signals. Then, a consistency time-varying model () is constructed. Finally, the above models are combined to obtain a dispensing volume prediction equation with the dispensing valve control signals and the time points as variable parameters.

Claims

1. A method for calibrating a dispensing system, applicable to calibrating the dispensing quantity control of a dispensing valve for an adhesive material, comprising: A glue valve control model is established, wherein the model is constructed using a calibration solution and a plurality of first glue valve control signals to obtain the relationship between the first glue valve control signals and the plurality of glue dispensing pressures they generate; a power law exponent is obtained, wherein the power law exponent is obtained using the glue material in a fresh state and a plurality of second glue valve control signals at a fixed dispensing time to obtain the relationship between the second glue valve control signals and the plurality of first glue dispensing flow rates they generate; a consistency time-varying model is constructed, wherein the consistency time-varying model is constructed using the glue material at a fixed glue valve control signal, for a plurality of time nodes, measuring the plurality of second glue dispensing flow rates corresponding to the glue material at those time nodes to obtain the relationship between the glue material and the second glue dispensing flow rates under time variation; the above models are combined to obtain a point glue prediction quantity based on the glue valve control signals and the time nodes.

2. The dispensing system calibration method as described in claim 1, wherein, The glue valve control model is (), the consistency time-varying model is (), and the dispensing prediction amount is based on a dispensing amount prediction equation with a variable parameter.

3. The dispensing system calibration method as described in claim 2, wherein, The calibration solution is either an aqueous solution of glycerol or a calibration oil.

4. The dispensing system calibration method as described in claim 2, wherein, The valve control model is either a lookup table with interpolation or a fitted polynomial function.

5. The dispensing system calibration method as described in claim 2 further includes fitting the consistency time-varying model () with an exponential decay function () and obtaining a time-varying rate constant k.

6. The dispensing system calibration method as described in claim 2 further includes fitting the consistency time-varying model () with a linear decay function () and obtaining a time-varying rate constant k.

7. The dispensing system calibration method as described in claim 2 further includes fitting the consistency time-varying model () with a hyperbolic decay function () and obtaining a time-varying rate constant k.

8. The dispensing system calibration method as described in any one of claims 5 to 7, further comprising: The goodness of fit of the time-varying consistency model is evaluated by calculating a coefficient of determination (R²).

9. The dispensing system calibration method as described in claim 8, further comprising: If the value of R2 is lower than a preset threshold, then the time-varying rate constant k is set to zero. Conversely, the time-varying rate constant k obtained through fitting is used.

10. The dispensing system calibration method as described in claim 9, wherein, The preset threshold is 0.

75.

11. A dispensing system calibration device, comprising: A dispensing device includes a dispensing valve and a dispensing nozzle. The dispensing valve controls the amount of adhesive dispensed, which is delivered through the dispensing nozzle. A pressure sensor is disposed within the dispensing device to detect the dispensing pressure of the adhesive. A flow sensing unit detects the amount or flow rate of adhesive dispensed per cycle. A calculator is coupled to the dispensing valve and is used to execute a dispensing system calibration method. The dispensing system calibration method includes the following steps: establishing a dispensing valve control model (), wherein the construction of the dispensing valve control model uses a calibration liquid and a plurality of first dispensing valve control signals to obtain the relationship between the first dispensing valve control signals and the plurality of dispensing pressures they generate; obtaining a power law exponent (), wherein the power law exponent () is obtained using the adhesive in a fresh state and a plurality of second dispensing valve control signals at a fixed dispensing time to obtain the relationship between the second dispensing valve control signals and the plurality of first dispensing flow rates they generate. A time-varying consistency model is constructed, wherein the model is constructed using the adhesive material. Under a fixed dispensing valve control signal, for a plurality of time nodes, the dispensing flow rates of the adhesive material at those time nodes are measured to obtain the relationship between the adhesive material and the dispensing flow rates over time. The above model is combined to obtain a dispensing quantity prediction equation with the dispensing valve control signals and the time nodes as variable parameters.

12. The dispensing system calibration device as described in claim 11, wherein, The calibration solution is either an aqueous solution of glycerol or a calibration oil.

13. The dispensing system calibration device as described in claim 11, wherein, The valve control model is either a lookup table with interpolation or a fitted polynomial function.

14. The dispensing system calibration device as claimed in claim 11, further comprising fitting the consistency time-varying model () with an exponential decay function () and obtaining a time-varying rate constant k.

15. The dispensing system calibration device as claimed in claim 11, further comprising fitting the consistency time-varying model () with a linear decay function () and obtaining a time-varying rate constant k.

16. The dispensing system calibration device as claimed in claim 11, further comprising fitting the consistency time-varying model () with a hyperbolic decay function () and obtaining a time-varying rate constant k.

17. The dispensing system calibration device as described in any one of claims 14 to 16, wherein, The dispensing system calibration method further includes: evaluating the goodness of fit of the consistency time-varying model by calculating a coefficient of determination (R2).

18. The dispensing system calibration device as described in claim 17, wherein, The dispensing system calibration method further includes: if the R2 value is lower than a preset threshold, the time-varying rate constant k is set to zero; otherwise, the fitted time-varying rate constant k is used.

19. The dispensing system calibration device as described in claim 18, wherein, The preset threshold is 0.

75.

20. A calculator for performing a dispensing system calibration method to calibrate the dispensing quantity control of a dispensing valve for an adhesive material, the dispensing system calibration method comprising the steps of: establishing a dispensing valve control model (), wherein, The glue valve control model is constructed using a calibration solution and a plurality of first glue valve control signals to obtain the relationship between these first glue valve control signals and the plurality of dispensing pressures they generate; a power law exponent () is obtained, wherein the power law exponent () is obtained using the glue material in a fresh state and a plurality of second glue valve control signals at a fixed dispensing time to obtain the relationship between these second glue valve control signals and the plurality of first dispensing flow rates they generate; a consistency time-varying model () is constructed, wherein the consistency time-varying model is constructed using the glue material at a fixed glue valve control signal, for a plurality of time nodes, measuring the plurality of second dispensing flow rates corresponding to these time nodes to obtain the relationship between the glue material and these second dispensing flow rates under time variation; the above models are combined to obtain a dispensing volume prediction equation with these glue valve control signals and these time nodes as variable parameters.

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