SU883664A2 - Program control device for metering out components of cellular concrete mixtures - Google Patents

Description

the ratio, the output of which is connected to the input of the water-solid relation master, and the second input to the second output of the water-solid ratio.

FIG. 1 shows a block diagram of the device; Fig. 2 shows an embodiment of the circuit for determining the water-solid ratio correction unit.

The device contains a unit 1 setting the properties of the mixture, which includes a unit 2 of the mass of dry components in the mixture, a unit 3 of the activity of the mixture, a unit 4 of the ratio of the silica component to a solid and a unit 5 of the water-solid ratio, unit 6 of the control lime block 8 assigning information about the density of 1lama, block 9 setting information about the mass of the suspension of aluminum powder, block 10 information about the concentration of aluminum powder, block 11 of the dose correction of the mass of aluminum powder according to its concentration, block 12 ELENI .dozy p cementitious block 13 Hicham El Guerrouj determine doses, dose determining unit 14 of water sensor 15 vodotverdogo ratio and a block 16 for determining correction vodotverdogo ratio. Blocks 7-11 form a block specifying information about the properties of the initial components of the mixture.

The device works as follows.

When signals from setters 2–5 of block 1 set the properties of the mixture and signals from blocks 7–, 8, and 11 to blocks 12–14, respectively, of the dose of the bladder, sludge, and water, are received, the latter produce signals at their outputs that are proportional to the masses of the components to be dosed which are weighed by weighing feeders controlled by the batch control unit b (dispensers are not shown),

At the output of the setter 2, the mass of the dry components produces a signal that is applied to the first inputs of the blocks 12-14 for determining the doses of the blasted slime and water

Taking into account the signals received from blocks 7 of the task — information about lime activity, from the setting unit 3 of the mixture activity and setting unit 4 of the ratio of the silica component to the live one, proportional to the activity of lime, the activity of the cellular mixture and the ratio of the silica component to the remaining one, block 12 produces at outputs signals proportional to the masses of lime-sand to the cement and cement to be dosed, which are fed to the inputs of block b and to the inputs of the block. 3,

Taking into account the signals from block 12, setpoint 2, and the signal from block 8, setting information about the density of sandy sludge.

unit 13 produces, at the outputs, signals proportional to the mass of sludge to be dispensed and the water content in the sludge, which are fed respectively to the input of the batch control unit b and to the input of block 14. From the outputs of interconnected blocks 9 and 10, specify information about the mass of the aluminum powder suspension and its concentration signals are received, taking into account of which the correction unit 11 produces, at the outputs, signals proportional to the mass of aluminum powder suspension to be dispensed and the mass of water in the aluminum powder suspension, which Applied respectively to the input of the batch control unit b and to the input of the block 14. Block 14, taking into account the signals from the outputs of the water-solid ratio setting device 5, the dose determining unit 13 of the slit 3 and the dose correction unit 11, the mass of the aluminum powder suspension according to its concentration, produces the signal is proportional to the mass of water to be dispensed, which is fed to the input of the dispensing control unit 6.

The water-solid ratio sensor 15 measures the water-solid ratio actually obtained in the mixture and sends a signal proportional to this value to the first input of the water-solid ratio correction determination unit 16, to the second input of which the second output of the water-solid ratio setting unit 5 is signaled. Proportional to the given value of the water-solid ratio of the mixture.

If the actual water-solid mix ratio is different from the set one, the water-solid correction correction unit 16 generates a signal based on the signals received on it and sends a signal to the input of the water-solid ratio adjuster 5 proportional to the value of the water-solid correction by which the water-solid ratio is changed for the next mixture preparation cycle ,

The determination of the dosage of the cellular mixture to be carried out is carried out simultaneously and automatically, based on information on the weight of dry components, taking into account the influence of the desired properties of the mixture and the actual properties of its components, as well as depending on the actual water-solid mixture ratio based on the results of the previous mixture preparation cycle.

The water ratio correction determination unit 16 contains serially connected operational amplifiers 17 and 18, a nonlinear control matrix NUM 19J constant output resistors 20-22, constant

A feedback resistor 23 of the amplifier 17 and a variable feedback resistor 24 of the operational amplifier 18.

The unit works as follows.

A signal proportional to the actual value of the solid mixture ratio comes from the water ratio sensor 15 to the first input of the block 16, and through the resistor 20 is fed to the input of the amplifier 17, where it is algebraically summed with the signal from the block 10 through the second input of the block 15 and resistor 23 proportional to set value of water hard relation. The output of the amplifier 17 generates a signal proportional to the deviation of the actual value of the water-solid ratio from the predetermined one, which through a resistor 22 enters the input of the operational amplifier 18, the gain value of which changes due to a change in the value of the resistor 24 controlled by the nonlinear control matrix NMU 19 depending on the magnitude of the signal sent to it about a given value of the water-solid ratio. At the output of amplifier 18, a signal is formed that is proportional in magnitude and corresponds in sign to the amendment to the value of a given water-solid ratio, the introduction of which should stabilize this characteristic of the mixture; This signal is fed to the first input of the water hardness setting device 5.

The ratios of the values of the constant resistors 20-22 and the feedback resistors 23 and 24 provide the necessary coordination of the scales of the processed signals. Actually - the value of the water-solid mixture ratio

is measured by the water hardness setting device 15, then this information is sent to the water hard quality correction determination unit 16, which also receives information about the given water hard ratio. Based on these two signals, the correction determination unit calculates the water-hard ratio correction necessary for this recipe and changes, in accordance with the features of the cellular concrete mixtures, the value of the water-solid ratio set to the next cycle. In this way, the properties of the mixture are stabilized and its composition is optimized.

For each value of a given water-solid ratio, a certain amount of correction is realized, which corresponds to the technological dependencies that determine the mutual correlation of these quantities.

Claims (1)

1. USSR author's certificate No. 838393, cl. G 01 G 19/38, 1975. "4J N : h