SU565218A1 - Gravimetric multicomponent proportioning device - Google Patents

Description

one

The invention relates to the field of weighing technology.

Devices 1, 2, 3 for weight multi-component dosing are known, comprising continuous weighing weighers, counting units, setting devices, adders. These devices do not provide the required accuracy.

It is also known a device 4 for maintaining a constant weight ratio of two components "interrupting" about mixing substances, containing two metering devices, the signals of the performance sensors of which are compared with each other in a reversible counter, one of the signals passing through a divider adjusted in accordance with the required ratio If the ratio deviates from the specified value, a command is generated for the control device.

The disadvantage of this device is that the control command is formed without taking into account the rate of increase of the performance ratio error.

Bleed: The technical essence of the invention is device 5, comprising continuous dispensers with performance sensors, a ratio controller, actuators, a discrete flow average, control units.

The known system, ensuring the processes of stabilizing the weight dosing, has, due to the presence of the averager, low accuracy indices in dynamic control modes associated with changes in the total consumption of the mixture upon commands from the outside. In addition, due to the non-identity of the dynamic characteristics of the dispensers themselves in transient control modes, a dynamic component of the component ratio error arises, associated with the "lag of the dispenser with low dynamic characteristics from the master.

The aim of the invention is to improve the accuracy of the ratio of weight costs by adjusting the dynamic characteristics of the metering devices in transient conditions.

This is achieved by the fact that in the proposed device the control units of all slave metering devices are equipped with a comparator, a relay, a differentiator, an adder and an element

OR, with one comparator input channel connected to the slave meter performance sensor, the second input channel is connected to the master metering sensor through the ratio block, and

The comparator output channels through the OR element are connected to the control input of the relay, which connects the output of the correlator unit through the differentiator to one of the inputs of the adder, the other input of which is connected to the output of the flow meter, and the output of the adder is connected to the actuator drive of the slave metering device.

The drawing shows a diagram of the device.

The device contains a leading metering device 1 and a slave metering device 2 (the remaining slave meters are not shown in the drawing) with conveyors 3, 4, under which the capacity sensors 5, 6 are installed, connected to regulators 7 and 8. Regulator 7 output is connected to the actuator 9, and the output of the regulator 8 is connected to the actuator 10 via an adder 11.

To the second input of the regulator 7 is connected by the program unit 12 metering mode. The master metering device 1 is connected via a channel of the sensor 5 to the ratio block 13, the output of which is connected to the comparator 14, to the relay 15 and to the second input of the regulator 8.

The output of the performance sensor 6 of the slave metering device 2 is connected to the second input of the comparator 14. The output channels of the comparator 14 are connected via OR 16 to the control input of the relay 15, the output of which is connected to the second input of the adder 11 through the differentiator 17.

The device works as follows.

When the control program is changed, the master dispenser 1 changes the signal at the output of sensor 5, which through the ratio block 13 goes to the control input of the controller 8 of the slave dispenser 2. If the rates of change of the signals of sensors 5 and 6 do not match, a dynamic error appears, proportional to the difference in the rate of change of the signals of the sensors 5, 6. The achievement of the permissible value of the error, regulated by the comparator 14, at one of its outputs, depending on the sign of the error 3, is a command signal, which, through element 16 AND And performs a switching relay 15.

When working out the relay command 15, the differentiator 17 and the adder 11 are connected to the output of the ratio 13 block, which inject into the control signal at the output of the regulator 8 an additional component proportional to the derivative of the master dispenser control signal 1. At the same time, the rate of change in the performance of the slave dispenser 2 increases in proportion to the rate of change of the signal from sensor 5, which leads to a decrease in the error ratio of the signals of performance sensors 5, 6. When aligning the rates of change in performance and reducing the error to a value that is less than permissible, the signal at the output of the comparator 14 disappears, which leads to disconnection of the differentiator 17 from the slave dispenser control circuit.

Claims (5)

1. Author's certificate number 219815, “l. G 01 G19 / 34, 1965. 2. The author's certificate number 392467, cl. G 05D 11/00, 1973. 3. US patent Ns 3173505, cl. 177--70, publ. 1965.  4. Patent of Germany No. 1182861, cl. 42f 31/03, onubl. 1960 5. Copyright certificate № 254142, cl. About 05D 11/00, 1968 (prototype).