SU549109A1 - The system of automatic control of the process of milk normalization in the tank - Google Patents

Description

inputs of logic elements And 12 and 74 starting blocks.

However, there are no pneumatic signals from logical elements OR 11 and 15, respectively, at the inputs of logic gates And 12 and 14, the outputs of logic gates And 12 and 14 also have no pneumatic signals and actuators 4 and 5 remain closed, which prevents the starting products from dosing: whole and skimmed milk. After pressing the button .13, the pneumo-signal through the logical element OR // is fed to the input of the logical element I 12, at the output of which a negative signal appears, the opening mechanism 5 and the starting pump (not shown) of the whole milk supply; Whole milk dosing begins. The same signal is input to the logical element OR //. Due to this feedback, the pneumo-signal remains at the output of the AND 12 logic element after the self-return of the button 13 to the initial position.

The pneumatic signal from the pressure sensor 7 of the product, which receives the actual hydrostatic pressure of milk in the tank through the membrane separator 6, is fed to the input of the comparison element 9.

In the absence of milk in the tank / this signal is 0.2 kgf / cm -. When the amount of whole milk in the tank is set to Q ,,, the pressure at the outlet of the product pressure sensor 7 is equal to the pressure set by the setting device W. The pneumatic signal at the output of the reference element 9 disappears. As a result, the pneumatic signal disappears from the output of the logical element "AND} 2, from the input of the logical element OR // and from the actuator 5. The dosing of whole milk is completed, the starting unit returns to its original state. The control of the dose entering the reservoir / is carried out on the secondary device 8.

In the case where the amount of whole milk to be supplied to the tank / is not known in advance, unit 10 at the inlet of the comparison element 9 sets the pressure corresponding to the maximum allowable amount of whole milk in tank J (taking into account the need for subsequent dosing into the tank / skimmed milk). At the end of the postmodulation of the whole modoco to the tank / pump for feeding the whole milk, (not shown in the drawing), the actuator 5 is closed. Then, using the secondary indicating device 8, the amount of whole milk entering the tank / is determined, and the unit 10 at the input of the comparison element 9 sets the pressure corresponding to the hydrostatic pressure of the actual amount of whole milk in the tank 1. In this case, the starting unit returns to its initial state the Determination of the QO dose of skimmed milk, which is necessary to obtain normalized milk of the required fat content according to GOST, is carried out using the fat balance equation based on the data

on the quantity Q ,, and the fat content of whole milk, and the fat content of the fat-free milk. The dosing of skimmed milk from tank 2 with skimmed milk to tank / is carried out in the same way as dosing of whole milk. At the same time, the setting device 10 at the inlet of the comparison element 9 establishes a pressure corresponding to the hydrostatic pressure in the tank of a quantity of normalized milk equal to the sum Qn - f Qo, and pressing the button 16, the actuator 4 is opened and the skim milk enters the tank /. The operation of the logic elements 15 and M OR AND And the starting block / at

dosing of skimmed milk is similar to the operation of logic elements // and 12 OR and “And the starting block when dosing the goal} of 1st milk. The dosing of skimmed milk is completed when the amount of milk in tank 1 becomes Qu -f Qo. The proposed system allows using one membrane separator installed in the tank where normalization is performed, one pressure sensor, one secondary indicating device, one setting device and one comparison circuit dosing of liquid products from

several tanks with precursors, and these tanks eliminate the need to install instruments to measure the mass of these products; This leads to lower costs for the implementation and operation of the system. The efficiency of the proposed system increases with an increase in the number of containers from which the starting products are metered.

Claims (1)

Invention Formula A system for automatically controlling the process of milk normalization in a tank, including a product pressure sensor and a setpoint device connected to the input of the reference element, and actuators installed on the whole milk supply line to skimmed milk in the tank, which is reliability and efficiency of the system, it is equipped with two similar starting blocks, each of which consists of logical elements OR and AND and a button, while the output of the element is compared with inputs of logical elements And, outputs of the latter are connected with executive mechanisms and with inputs of logical elements OR, the second inputs of which are connected with buttons, and outputs with the second the inputs of logical elements I. j I × 73 R T