SU1260105A1 - Apparatus for controlling mouldability of sand - Google Patents

Description

one

The invention relates to the automation of technological processes for the production of building materials and can be used to stabilize the formability of silicate mass.

The aim of the invention is to improve the quality of the mixture.

FIG. 1 is a block diagram of a device for adjusting the formability of the mixture; in fig. 2 - the dependence of the coefficient of matter on the moisture content of the silicate mixture.

The device contains sensor 1 of moisture of the compacted mixture, sensor 2 of the consistency of the unconsolidated mixture, setpoint 3, two-threshold comparator 4, the outputs of which are connected to the inputs of the accumulator 5, the controller 6 whose input is connected to the output of the adder, and the output with the controlled vein - Til 7, the sensor 8 for the presence of the mixture and the detector 9 for the switched on state of the conveyor, the output of which is connected to the input of the matching node 10,. The outlet valve 11 for supplying water to the mixer, the control input of which and the second input of the regulator are connected to the matching node 10, a formability sensor 12, consisting of sensors 1 and 2, a sensitive element of the mixture presence sensor 8 — fastening 13.

Capacitive moisture meters are used as sensors 1 and 2, two-threshold comparator 4 is made on the basis of an operational amplifier with a non-linear element (rectifier) in the feedback circuit, controller 6 is made on the basis of the serial regulating device FP4, which provides the W-law of regulation.

As a signaling device 9 of the switched on state of the conveyor c. The device used a block contact actuator motor conveyor. As the sensor 8 the presence of the mixture used contactless switch type IHC. Matching node 10 is made according to the OR scheme, which triggers when there is no mixture under the formability sensor 12 or when the conveyor is turned off.

The device works as follows.

Optimal formability of the mixture, e.g. silicate, ceteris paribus, is achieved at a moisture equal to the maximum molecular moisture and is within 4.5

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6%. Within the specified range, the optimum moisture content depends on the specific surface of the original sand and the grit, its type and content in the silicate mixture. The amount of water needed to wet the grains of the original vagina and sand is proportional to their total surface.

The criterion for the moldability of a silicate mass is, in particular, its compactibility, which is characterized by an imbalance coefficient (compaction). The coefficient of weft is defined as the ratio of the density of the compacted silicate mixture Root-p to the bulk f. The relationship between the coefficient of matte 14 and the difference between 15 and., PIRn and the wetness of the silicate mixture is shown in FIG. 2;

The coefficient of variation of these dependences (the latched regions in Fig. 2) in humidity reaches 1%. The specified range of changes in humidity, as a minimum, should provide a system for stabilizing the formability of the silicate mixture. The optimal value of the difference between p and P (coefficient of compaction) is chosen from the condition of obtaining the maximum possible strength of the raw brick and the steamed brick (after autoclaving). Sturdy raw material is obtained at a lower humidity than a steamed brick, and the optimum formability value at a particular plant is determined experimentally (in the moisture range of 4.5-6%). When mixtures containing 15-20% are commonly used in the production of silicate brick on the go, the difference in the strength of a brick when changing the molding moisture by 1% compared with the molecular moisture capacity results in a difference in the strength of the raw material by 15-25% ..

In the proposed device (Fig. 1). the compactibility of a mixture (coefficient of weights) is defined as the difference between the signals of the humidity sensors of the compacted and unconsolidated silicate mixture. For the same composition and properties of the silicate mixture, the readings of moisture meters will differ only due to the change in its density, and the difference will characterize its compactibility.

The difference between the signals of the sensors I n 2 of the humidity of the compacted and unconsolidated mixture is compared with the help of adder 5. Depending on the error signal (mismatch) by possibility. the action of the regulator 6 on the controlled valve 7 is carried out the necessary correction of the water flow (compensation: an error signal) entering the mixer. The presence of an extreme point in the regulation characteristic of formability (FIG. 2) within a moisture content of 7% requires the introduction of a corrective node — a two-threshold comparator 4. When the humidity changes beyond permissible limits (more than 7% or less than 4%), the horn comparator 4 triggers. the signal of the two-threshold comparator obviously exceeds the remaining signals, thereby ensuring the forced regulation of the humidity of the Mixture within the prescribed limits. The supply of water to the mixer, as well as the control of the controlled valve 7, is possible only if there is a controlled mixture and the conveyor is operating.

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The conveyor enabled indicator 9 generates a signal at the output when the conveyor motor is turned on. In the absence of a silicate mixture on the conveyor belt, the capacitance sensor 12 is lowered, and therefore the fastener 13 is moved by the angle of. 8 the presence of the mixture forms using

the matching node 10 command shut-off valve 11.

In the proposed device introduced the adjuster formability and humidity, two adders, two-threshold computer

Rator, control and stabilization of the silicate mixture formability is carried out with the help of humidity sensors of the compacted and non-compacted mixture directly on the moving.

porter, and the optimum humidity range of the device is corrected using a moisture sensor of the compacted mixture, which allows improving its quality.

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Strength of silicate mixture, W, 7o Fi.g.2

Compiled by A. Abrosimov Editor E. Sligan Tehred L. Serdyuk she Proofreader E. Sirohman

Order 5164/7 Circulation 757 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR REGULATING THE FORMABILITY OF THE MIXTURE, mainly silicate, containing a regulator for supplying water to the mixer connected to a controllable valve, and a shut-off valve for water, characterized in that, in order to improve the quality of the mixture, it is equipped with moisture sensors of a compacted and uncompressed mixture, a formability setter, an adder, a two-threshold comparator matching the node ^ 1, a sensor for the presence of a mixture and an indicator of the on state of the conveyor, and the humidity sensors of the sealed and uncompressed mixture are connected s to first and second inputs of the adder, the output of which is connected to the regulator input, the output of the humidity sensor compacted mixture is also coupled to the input of a window comparator, the sensor outputs a mixture of the availability and status signaling device incorporated _with transporte- pa through a matching node podsoedine- ® us to the control input otsechnogb the valve and the second input of the regulator, the formability master and the output of the two-threshold comparator are connected respectively to the third and fourth inputs of the adder. SU „1260105 1 1260