SU467263A1 - Device to control the process of preparation of mixtures - Google Patents

Description

bilization, and a divider is included at its input

7 with a constant or adjustable division ratio to improve the accuracy of the measurement and provide the ability to adjust to a given degree of stabilization.

The setting of the divider depends on the permissible value of the instability and on the time between two consecutive power measurements. If the end of process signal is to be issued when the instability of the power consumed is reduced to one percent per minute, and this power is measured at an interval of 1 minute, then the tolerance for power instability will be expressed as a number 100 times less than the above. the number of pulses, directly or inversely proportional to the power consumed, and a divider with a division factor of 1: 1000 can be set to the input of the storage unit 4.

For convenience of comparing the difference in the number of pulses with a tolerance value, a reversible counter of pulses 6 is connected to an indicator.

8nul.

The control unit 3 is provided with a counter input switch 9, which serves to automatically close the subtraction input and open the addition input when the 8 zero indicator is triggered.

The electric motor 1 drive has a starting device 10.

The device works as follows.

In the power supply circuit of the electric motor 1 of the drive, the power consumed by it is measured by the meter 2 in the form of a block, which produces a series of pulses, the number of which is determined by the power consumed during the measurement time.

The control unit 3 directs these pulses to the input of the addition of the reversible counter 6 and simultaneously to the divider 7, which passes a predetermined part of the pulses to the storage unit 4 (tolerance register).

After an exposure of the required predetermined time, the power meter 2 outputs a second pulse train, which is sent to the subtraction input of the counter 6 and does not fall on the divider 7.

Depending on the change in power consumption between two measurements, the number of pulses in the second series may be more or less than their number in the first series. In this case, with a smaller number of pulses in the second series, on the reversible counter 6, the difference in the number of pulses in two consecutive series is obtained without additional switchings, and with a larger number in the subtraction process, the zero appears on the reversing counter, the indicator 8 zero automatically closing input subtraction and opening input of the add. As a result, after receiving two series of pulses, the absolute value of the difference in the number of pulses is always present on the reversible counter 6, regardless of which of the series (first or second) has more pulses.

At the end of the subtraction, block 5 compares the contents of the reversible counter 6 and the storage unit 4.

If the tolerance value is greater than or equal to the difference between the number of pulses in two consecutive series, then stabilization with a given degree of accuracy is achieved, and the comparison unit 5 generates a signal for the drive motor 1 to turn off. If the difference between the number of pulses in two consecutive series exceeds the tolerance value, the device automatically zeroes and the next measurement cycle is performed.

Subject invention

Claims (4)

1. An apparatus for controlling the process of preparing food mixtures, for example, confectionery, based on determining their readiness to stabilize the power consumed by the mixer drive motor, containing a power meter included in the supply circuit of the specified drive, characterized in that, in order to accurately determine the readiness with a small tolerance for stabilization, it contains a unit for calculating the change in power consumption, a control unit, a storage unit that serves to set the tolerance for the degree of unit, and a number comparison unit expressing the tolerance on the degree of stabilization with the difference of numbers corresponding to two power measurements, while the power meter is made in the form of a pulse output unit, the number of which is determined 0 power consumed during the measurement. 2. The device according to claim 1, characterized in that, in order to ensure the simplicity of the design, the unit for calculating the change in power consumption is made in the form of a reversing pulse counter. 3. The device according to claim 1, characterized in that, in order to increase the accuracy of the measurement and to enable adjustment to a given degree of stabilization, a divider with a constant or adjustable division factor is included at the input of the storage unit. 4. The device on pi. 1 and 2, characterized in that, in order to provide convenience 5 comparing the difference in the number of pulses with the tolerance value, it contains a zero indicator connected to a reversible pulse counter, and the control unit is equipped with a counter input switch, which serves to automatically close the subtract input and open the add input when the zero indicator is triggered.