SU1553960A1 - Device for controlling viscosity of product - Google Patents

Abstract

The invention relates to devices for adjusting the viscosity of a product in rotating apparatuses. The purpose of the invention is to expand the scope. This goal is ensured by the fact that the device contains an active component of the engine power sensor, a proportional controller with an input adder, a generator, a secondary device with a position controller, and a control circuit. A distinctive feature of the device is to provide control of the power of the electric motor at fixed points in time, determined by the period of rotation of the apparatus. This eliminates the periodic error of viscosity measurement associated with the unbalance of the apparatus. 1 il.

Description

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The invention relates to the preparation of various products, for example plastics, with a specified viscosity in volumetric mixers of x-type melters.

The aim of the invention is to expand the scope.

The drawing shows a schematic diagram of the device.

The device contains current transformers 1 and 2, voltage transformer 3 and power converter .4 forming an active power sensor, power setpoint 5, proportional control 6, position regulator 7 with output contacts 8 and 9, mixer rotation angle sensor 10 closing contacts 11, the actuator 12 with an electromagnet 13, an intermediate relay 14

With contacts 15 and 16, an intermediate relay 17 with contact 18. The rotation angle sensor 10 interacts with a latch 19 mounted on the shaft of the mixer 20, the actuating device 12 controls the flow of coolant in the pipeline 21. The coolant enters the output pipeline 22 through the mixer jacket 20, in which the product 23 is prepared. In the process of preparing the product, the mixer is rotated by means of the electric drive 24.

The device works as follows.

After switching on the electric drive 24 of the mixer, the rotation of the mixer filled with product 23 begins. The control circuit of the relay 14, 17 h of the electromagnet 13 is fed

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and turn on the devices 4-7. At the output of the power converter 4, a unified DC signal of 0-5 mA is formed, proportional to the active component power of the electric drive 24. In connection with the unbalance of the mixer, the power changes are sinusoidal. The regulator 6 sets the level of the signal and its amplification using the adjuster 5, taking into account the characteristics of the secondary device 7, in order to ensure maximum signal gain. During operation, the mixer periodically triggers the angle of rotation 10 from the latch 19 and closes its output closing contact 11. At the initial moment of time when the mixture is above a predetermined value, the contact 8 is closed. the same closure of the contact 11, the mains voltage is supplied through the contact 8 to the intermediate relay 13, the contacts 15 and 16 are closed. Through the contact 15, the intermediate relay 14 is self-powered, and the contact 16 ensures the electromagnet is turned on 13. The valve 12 opens and the coolant enters the jacket of the mixer through conduit 21. The mixture is heated and melted. In the process of melting the mixture and further heating it decreases its viscosity. As soon as viscosity becomes less than a predetermined value, during the next closure of contact 11, the voltage on the intermediate relay 17 is wired, since in this case contact 8 is open and pin 9 is closed. Contact 18 opens, causing the intermediate relay 14 to turn off and contact 16 to open. Executive device 12 turns off and further warm-up is stopped. Further, the described process is repeated, and the system establishes a stable auto-oscillation process with respect to a given value.

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Claims (1)

Since the response frequency of sensor 10 does not depend on viscosity and other characteristics of the mixture, but is determined only by the mechanical characteristics of the mixer, the control eliminates the periodic error of viscosity measurement. Invention Formula A device for adjusting the viscosity of a product, comprising a mixer, jacketed, connected to the coolant supply line, an electric motor connected to the mixer drive shaft, an active component sensor for the engine power, an actuator and a proportional controller, the first input of which is connected to the active sensor output power, and the second with the output of the power setting device, characterized in that, in order to expand the scope of application, it is provided with a position regulator, the input connected to the output a proportional controller, two intermediate relays and a mixer angle sensor, the first winding terminal of the first intermediate relay being connected to the zero bus network, and the second terminal to the first terminal of the closing contact of the position regulator of the secondary device and to the first terminal of the second contact of the second intermediate relay, the second output of the closing contact of the position regulator is connected to the first output of the opening contact of the position regulator and through the closing contact of the angle-of-rotation sensor - with fa The network bus, the second output of the opening contact of the second intermediate relay is connected via the first closing contact of the first intermediate relay to the phase bus of the network, the second output of the opening contact of the position regulator is connected to the zero bus network via the winding of the second intermediate relay, and the actuator electromagnet network through the second closing contact of the first intermediate relay. Editor L. Veselovska Compiled by V. Sheftel Tehred A. Kravchuk Proofreader N. Revsk Order 456 Circulation 645 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription