Method and device for a pulsation-free, continuous and gravimetric dosing
First Claim
1. In a method for the gravimetric control of a mass flow from or into a container located on a balance using a pulsating dosing pump, comprising wherein the output signal of the balance is digitally filtered, the course in time of the mass flow is cyclically estimated from the filtered weighing signal, this estimated value of the course in time of the mass flow is used to calculate the course in time of an auxiliary mass flow which compensates the pulsation of the mass flow of the pulsating dosing pump and a speed course is calculated from the course in time of the auxiliary mass flow for driving an auxiliary dosing pump.
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Abstract
The gravimetric control of a mass flow from or into a container located on a balance using a pulsating dosing pump, the output signal of the balance is digitally filtered in such a manner that the course in time of the mass flow is cyclically estimated from the filtered wighing signal. This estimated value of the course in time of the mass flow is used to calculate the course in time of an auxiliary mass flow which compensates the pulsation of the mass flow of the pulsating dosing pump and a speed course is calculated from the course in time of the auxiliary mass flow for driving an auxiliary dosing pump.
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Citations
10 Claims
- 1. In a method for the gravimetric control of a mass flow from or into a container located on a balance using a pulsating dosing pump, comprising wherein the output signal of the balance is digitally filtered, the course in time of the mass flow is cyclically estimated from the filtered weighing signal, this estimated value of the course in time of the mass flow is used to calculate the course in time of an auxiliary mass flow which compensates the pulsation of the mass flow of the pulsating dosing pump and a speed course is calculated from the course in time of the auxiliary mass flow for driving an auxiliary dosing pump.
- 8. In a device for the gravimetric control of a mass flow with a dosing pump which doses the material to be dosed from or into a container located on a balance, whereby the delivery force of the dosing pump comprises pulsating components, with a control unit which regulates the delivery force of the dosing pump on the basis of the output signal of the balance in such a manner that the average time value of the delivery force achieves a set theoretical value, comprising wherein an auxiliary dosing pump is connected in parallel to the dosing pump, the delivery force of the auxiliary dosing pump is regulated by the control unit in such a manner that the sum of the delivery forces of the two pumps is free of pulsations and the delivery force of the main dosing pump is regulated by the control unit in such a manner that the sum of the delivery forces is maintained at the set theoretical value.
Specification